Diagnosis from Pump Operation Suction recirculation will produce the previously mentioned loud crackling noise in and around the suction of the pump . Above, we have provided a brief table showing the differences between a discharge and a suction line hose. Similar to the pressure, the discharge line is high or hot, and the suction line has a cold temperature. number: IT01334900287 Net Assets Euro 3.175.406,00 Click Here to join Eng-Tips and talk with other members! The use of premium quality materials helps it to prevent leakage and be highly durable. UNILAB S.R.L. This is because the volume of the refrigerant gas that the suction line hose carries from the evaporator is much higher than when it enters the expansion valve. Similarly, a suction line hose conveys refrigerant from the evaporator to the compressor. The key difference between a discharge and a suction line hose is their connection system. 3 What is the difference between suction and discharge? Suction From Figure 2, 191.84 kW capacity in 54 mm OD suction line results in a 0.04 K m-1. Therefore, the temperature drop per unit of length for suction lines is greater than that of discharge ones. Over sizing lines increases the cost of the system. The suction line is usually the big line hose in the A/C refrigeration system. They have different pressure and temperature and connect various A/C components. The key difference between a discharge and a suction line hose is their connection system. Horizontal suction lines should slope 1/2" per 10' toward the The discharge pipe is 1,200m in length made of steel schedule 40 pipe. You will also notice the line sweating where there is no insulation. Suction and discharge recirculation can be very damaging to pump operation and should be avoided for the continuous operation of pumps of significant energy level or pressure rise per stage. But opting out of some of these cookies may affect your browsing experience. The suction pressure is elevated because the discharge gases have leaked through the rings. Suction strainers, when used, must have a net free area of at least three times the suction pipe area. In terms of diameter, discharge pipe diameter should normally match the discharge flange on the pump but can be larger to reduce friction losses and decrease system pressure. Both of them transfer refrigerant through the connections. 1 Why is the suction line bigger than the discharge line on a pump? Additionally, you should have straight pipe going into the inlet, preferably with a length of ten times the inlet size of the pump. 5 What happens if the suction line is not insulated? ), From "BigInch's Extremely simple theory of everything.". However, a good quality discharge line hose may cost higher than a good suction line hose.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,600],'hosetips_com-large-mobile-banner-2','ezslot_9',109,'0','0'])};__ez_fad_position('div-gpt-ad-hosetips_com-large-mobile-banner-2-0'); Yes, the suction line is bigger than the discharge line in the refrigeration system. Heres our favorite suction line: UAC has been quite popular in offering high-quality automotive parts and components, and this Suction Line Hose is no different. These cookies will be stored in your browser only with your consent. Save my name, email, and website in this browser for the next time I comment. The Pump Suction line is one (or more)sizes larger than the pump suction nozzle. Just as Quality wrote. Atlanta Rubber & Hydraulic's discharge hoses can be found here. Solid-core suction-line filter driers are designed for cleanup and are installed in a system suction line. Discharge The correction factor for discharge lines is 1.117; thus, the previous 139.76 kW associated to 42 mm OD tube becomes 156.11 kW that with an equivalent length of Le=27 m implies a temperature drop of 0.39 K (acceptable). 1. tutorial3.htm). When your HVAC system is new, this line is insulated air-tight with 3/4 insulation. 5.47 Normally the outlet is smaller (which is why you'll see 10"x8" centrifugal pumps but never 8"x10"). As nouns the difference between suction and discharge. The compressor power will have a peak and then fall again. 6 Is the discharge line high or low pressure? If you are pumping a long distance, 3-5 ft/sec pipe velocity is appropriate on the pump discharge. This cookie is set by GDPR Cookie Consent plugin. 4 Why discharge of centrifugal pump is largest? What problems are caused by undersized suction lines? *Eng-Tips's functionality depends on members receiving e-mail. What qualifies you as a Vermont resident? The suction pipe of a centrifugal pump is not necessarily a larger bore (diameter) than the discharge pipe. You should not feel heat if the coil is clean. The UAC Discharge Line Hose is a high-pressure line you can get as a replacement for the one that is faulty. The four basic line types in a hydraulic system are pump suction, return (Low pressure <100 PSI), medium pressure (500 to 2000 PSI), and high pressure (2100 to 5000 PSI). A suction line accumulator prevents compressor damage from a sudden surge of liquid refrigerant and oil that could enter the compressor from the suction line. Suction piping should be at least one size larger than the suction flange at the pump. Centrifugal pump is a kinetic device. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. This cookie is set by GDPR Cookie Consent plugin. How much is a #5 Newhouse bear trap worth? Below is an inline pump, where the suction is normally lower (on the right in the picture) and a larger diameter (to achieve low s. When it is not working anymore, you can easily replace it. Both types of high-pressure mud pumps are being utilized on rigs for circulating the drilling fluid around. The larger pipe is known as the suction line, and includes insulation. A valve designed for flow control should be installed in the discharge. The cookie is used to store the user consent for the cookies in the category "Other. It uses premium-grade materials to ensure long-lasting performance. The line diameter is decided by pressure drop requirement, due to the NPSH requirement for centrifugal pump, that implies a smaller pressure drop limit for the pump suction line; but as the fluid at discharge line is with higher pressure, it allows a higher pressure drop in discharge line. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. We have received your request and will respond promptly. Login. AS TIME passes, this insulation breaks down, and you can see gaps and . References c). Line sets come in multiple lengths and are designed to be cut to fit your exact need. . number: 204909 Ph. This extra heat will also be present in the compressed refrigerant going to the condenser, downstream of the compressor. Already a Member? Because your hand is in the 90's, the suction line should always feel cool. The suction line should contain low-pressure superheated suction vapor. You may also require a suction line hose to fix the A/C in your car. Discharge superheat temperature. The suction line connects the evaporator to the compressor, the discharge line connects the compressor to the condenser, and the liquid line connects the condenser to the expansion device. The discharge pipe should be the full size of the compressor outlet or larger, and it should run directly to the aftercooler if one is used. A smaller suction line the same pipe size as the discharge line would result in more pressure drop in the suction line and reduce the amount of head available to the suction side of the pump. This cookie is set by GDPR Cookie Consent plugin. This cookie is set by GDPR Cookie Consent plugin. When you start the compressor for the very first time the oil is return to the compressor. To calculate the discharge head, we determine the total head from the characteristic curve and subtract that value from the pressure head at the suction, this gives the pressure head at the discharge which we then convert to pressure. The cookies is used to store the user consent for the cookies in the category "Necessary". The following values of correction factors are relative to the tables reported in Figures 1 and 2. A suction hose is also called a return line or vapor line as it sends back the vapor that earlier came from the compressor. You also have the option to opt-out of these cookies. However, you may visit "Cookie Settings" to provide a controlled consent. Suction From Figure 2, 191.84 kW capacity in 54 mm OD suction line results in a 0.04 K m-1. Step 3 : Analyse the location and the space provided in the unit plot plan w.r.t. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Thanks. In any system, what goes out in the discharge, comes back in the suction. Preventing Flooding On a Walk-In Call Symptoms of Overcharge Diagnosing and Replacing a Run Capacitor Symptoms of Low Refrigerant Charge Preventing, Finding & Repairing Refrigerant Leaks Proper Use of Manometers for HVAC Technicians UV light and Petri Dish Demo Tool Talk Live - Probes, Bags, Hand Tools, Power Tools & More Metal 3D printing has rapidly emerged as a key technology in modern design and manufacturing, so its critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. The pump suction line size is 3" sch 40 while the discharge line size is 2" Sch 40. Refrigerant lines should be sized to provide a minimum pressure drop at full load, return oil from the evaporator to the compressor under minimum load conditions, and prevent oil draining from an active evaporator into an idle one. The suction block valve should be line size. The cookie is used to store the user consent for the cookies in the category "Analytics". The next table illustrates an example of the sizing table for R134a, copper tube; the third column is devoted to the liquid lines, the other refers to suction and discharge lines. The article provided all the information regarding the discharge vs suction line hose. In most cases, a 3/8 liquid line is a safe bet, but just like the suction line, there is some wiggle room depending on the system and the specific application. Why is the suction line bigger than the discharge line on a pump? The suction nozzle is one size larger than the discharge nozzle. Discharge hoses take up less space than suction hoses, hence the name lay flat. This is in order to ensure sufficient available Net Positive Suction Head (NPSHa) to meet the NPSH required (NPSHr) by the pump. The first number is typically the inlet, and the second is the outlet. Next time on a start up do a little test and you will find oil in the suction line (before start up). Answer: The terms suction and discharge are the terms refer to hydraulics. 4 Why is the suction pipe diameter greater than or equal to the discharge pipe diameter when design pumping system? What is the diameter of a suction pump pipe? Here we have explained all the information about the discharge and suction line hose and their differences. Plugged or clogged filter, strainer or suction line. Available in 10', 15', and 20'. The smaller uninsulated line typically carries a warm liquid. And the suction line hose links the evaporator outlet to the compressor inlet. This cookie is set by GDPR Cookie Consent plugin. Or do you want to know your A/C refrigeration system better? If you have an air conditioner, you have a suction line-that's the "cold" copper line that runs between the compressor and the evaporator, and it carries the cool refrigerant back to the compressor to be turned back into liquid. Due to discharge lines being larger than the discharge nozzle, eccentric reducers are required in the line.. Reducers should be as close as possible to the nozzle; with top suction-top discharge pumps, care must be taken to ensure that the flats on eccentric reducers are orientated so that the lines do not foul each other.. A pressure gauge should be located in the discharge line, upstream of . 8 What is the difference between the suction line and discharge line? This has been tested to prevent leaking quite efficiently. The smaller the discharge line is the more you raise your discharge pressure. The data listed in tables refer to a refrigerating system which operates at 40 C of condensation temperature without subcooling, but they can be applied up to 5 K of subcooling without introducing any What is suction and discharge head? The suction line hose then conveys the refrigerant from the evaporator to the compressor. 5.42 At least 5 pipe diameters should be provided after bend. Registered R.E.A. No, the suction lines should not be hot. Discharge Cavitation -This occurs when the pump is being operated at the far left hand side of the pump curve. A discharge hose connects between the compressor and condenser. Then it travels to the suction line or the low side. They can be the same size. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. The low price of this line hose is the best thing about it. We also have common assemblies. Answer (1 of 5): Standard axial suction, radial discharge. A centrifugal pump working in this situation requires priming initially. For example, a 2-inch bypass would . We also use third-party cookies that help us analyze and understand how you use this website. Overhead suction lines should slope downward to the pump to allow draining of the suction system through the pump. How do I calculate pump suction pipe size? Is the discharge line high or low pressure? A Showdown of the Key Differences Between Pipe and Tube. The suction nozzle size is usually sized one size larger than the discharge nozzle. Promoting, selling, recruiting, coursework and thesis posting is forbidden. The suction line diameter is normally either 3/4, 7/8 or 1 1/8 inches, it depends on the size (and efficiency) of the air conditioning system or heat pump. But the availability of numerous products may confuse you about which one to buy. They transfer refrigerant vapor and lubricant, which need plenty of space to flow properly. The cost of discharge lines and suction line hoses are almost the same. Though they have high pressure, discharge line hoses are smaller. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. The suction line connects the evaporator to the compressor, the discharge line connects the compressor to the condenser, and the liquid line connects the condenser to the expansion device. By clicking Accept All, you consent to the use of ALL the cookies. If the pump draws liquid from a sump at a lower elevation, provide a combined foot valve and strainer. And the suction line hose links the evaporator outlet to the compressor inlet. Pipe sizing is a balancing act between cost and friction loss. The larger line typically carries a cool gas and is insulated. On our website, you will find documentation about our Engineering Software Products, Tutorials, Case Studies written in collaboration with our longstanding customers', and Articles about Thermodynamics, Engineering, and HVAC Market Insights. This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Which is typically larger on the compressor the suction or the discharge line? The discharge line is normally one size larger than the discharge nozzle. Atlanta Rubber & Hydraulics is a solutions . 3 How do I calculate pump suction pipe size? Registration on or use of this site constitutes acceptance of our Privacy Policy. It carries refrigerant vapor from the evaporator back to the compressor. Any form of turbulence reduces efficiency and increases wear and tear on the pump's bearings, seals and other components. Is the suction in a turbine the same as the discharge? The suction line connects the evaporator to the compressor, the discharge line connects the compressor to the condenser, and the liquid line connects the condenser to the expansion device. Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a parts function at the center of their design considerations. Suction and discharge lines are more critical than liquid ones from a design and construction standpoint. c). The cookies is used to store the user consent for the cookies in the category "Necessary". Below is the detailed explanation: Discharge and suction line hoses connect different components of an A/C system. Figure 1: Suction, Discharge, and Liquid Line Capacities in Kilowatts for R134a (Single- or High-Stage Applications). Overall, one of the best replacement discharge lines available in the market. Compared to the finer screens of filters, they are . Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Step 1 : Collect the P&ID and the pump data sheet. Discharge Line HVAC School 255K subscribers Subscribe 70K views 2 years ago HVAC Fundamentals Bryan gives a quick. As you increase the compression ratio, your volumetric efficiency decreases. Pump is too far from the source, creating long suction line. suction and discharge line routing. Pump suction strainers are installed onto the suction inlet or piping of a pump to protect the system from taking in solid foreign matter from the fluid reservoir. The next table illustrates an example of the sizing table for R134a, copper tube; the third column is devoted to the liquid lines, the other refers to suction and discharge lines. Which is larger suction flange or pipe size? This is done to make sure there is enough Net Positive Suction Head available to meet the requirements of the pump. When the refrigerant gets into the evaporator, the pressure gets down. The high-pressure refrigerant travels to the expansion valve that regulates it to the evaporator. Since pumps accelerate the fluid between inlet and outlet, the outlet size has a higher velocity, but flowrate is the same, giving a smaller area anddiameter. The expansion device is typically located at the end of the liquid line, at the inlet to the evaporator. A discharge line hose connects the compressor outlet to the condenser inlet. The discharge temperature should be less than 225 F. The discharge line is normally one size larger than the discharge nozzle. V= Velocity in pump suction side (velocity in suction pipe is generally considered in range from 06 to 1.5m/s. These cookies track visitors across websites and collect information to provide customized ads. So there are many factors, along with the type and make of pump, to determine whether the pump may be supplied with the same size suction and discharge. The pump is a 2"X1"-10" which is 2" suction side flange, 1" on the discharge and 9" impeller. This cookie is set by GDPR Cookie Consent plugin. The discharge side includes compressor and condenser, and the suction side includes expansion valve and evaporator. Necessary cookies are absolutely essential for the website to function properly. This will prevent turbulence. Figure 1: Suction, Discharge, and Liquid Line Capacities in Kilowatts for R134a (Single- or High-Stage Applications). Suction Head - The inlet pressure of a pump when above atmospheric pressure. For the same amount of pressure drop (discharge vs. suction) the suction drop increases the compression ratio to a greater extent. The discharge line is normally one size larger than the discharge nozzle. In-Line Gauges Sprinkler System Gauges Valves . So, when you touch a suction line, it will be cold. The cookie is used to store the user consent for the cookies in the category "Performance". 9 Why pump discharge is smaller than suction? Steps to do Pump Piping. Please let us know here why this post is inappropriate. It is the low-pressure side that has a lower temperature. Heres our favorite pick you can try: This Discharge Line Hose from UAC is an excellent replacement for any cars refrigeration system. The expansion device is typically located at the end of the liquid line, at the inlet to the evaporator. Total Head - The total pressure difference between the inlet and outlet of a pump in operation. Required fields are marked *. b). The suction nozzle is one size larger than the discharge nozzle. Before the cold air cools the cabin, they go through the suction line. So, in designing the suction-side pipework for your system, you must ensure that it exceeds the manufacturer's NPSH-R rating for the operating conditions. A typical . And now the refrigerant inhales the heat from the cabin and fans out the cold air. Your email address will not be published. Undersized piping results in high internal refrigerant velocities and good oil return but high line per metre pressure drops and resultant loss in system capacity; as well as compressor overheating due to compressor cooling losses and compressor failures. The liquid line should not be hot or warm for that matter. Also, what would happen if they both were the same size? This makes liquid line, suction line, discharge line and indoor air measurements your primary indications of performance. http://www.eng-tips.com/viewthread.cfm?qid=239699, Low-Volume Rapid Injection Molding With 3D Printed Molds, Industry Perspective: Education and Metal 3D Printing. Why is the suction line bigger than the discharge line on a pump? Evaporator outlet to the compressor inlet, Extensive engineering ensures high precision, Premium-quality design to meet OEM specifications. Is the discharge line size the same as the nozzle size? Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. Triplex pumps: the cranks are at 120 and can be run at a maximum of 150 - 170 spm. The ASHRAE Handbook (2006) reports different tables to design the liquid lines as a function of the system capacity, refrigerant and tube material, for fixed temperature change of 0.02 K m-1in the case of liquid line and for liquid velocity of 0.5 m s-1 for the receiver to condenser connection lines. A short 350mm diameter pipeline serves as the pumps suction line with insignificant head loss. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. What determines the discharge and suction pressure of the refrigeration system? . How a Refrigerator Suction Line Works Essentially, the compressor is a pump that draws in cold refrigerant gas stored in the evaporator and left over from the appliance's last cooling cycle. The velocities and pressure drop in pump suction and discharge lines are 3.25 ft/sec, 0.6 psi/100ft and 7.17 ft/sec, 6.6 psi/100ft respectively. Figure 3: Fitting Losses in Equivalent Metres of Pipe. Attach a thermometer designed to take pipe temperature to the suction line. No, the liquid (discharge) line is the high pressure side. If not possible, consider cascade bends, see Fig. PIPE DIAMETER ON SUCTION SIDE SHOULD BE EQUAL OR ONE SIZE LARGER THAN PUMP INLET. For different condensation temperature the table capacities must be multiplied by the correction factors listed, which depend on the selected refrigerant. Something this and all other original posters (OP) need to understand is the hazards of vagueness and gross generalizations. A = Cross-section area of Pipe or (A=/4 * D2). The rule of thumb for suction piping is least one size larger than the suction flange. The expansion device is typically located at the end of the liquid line, at the inlet to the evaporator. Once that the equivalent lengthLe is known, the total temperature drop T can be easily estimated using the following equation: where (T/L)Table is the design temperature drop per unit of length, P0 is the cooling capacity and P0,Table is the cooling capacity listed in the table. Too small of diameter on suction piping. Note: The usual total pressure drop used to size suction lines is a DP that would impose no more than a 2F temperature penalty. Figure 2: Suction, Discharge, and Liquid Line Capacities in Kilowatts for R410A (Single- or High-Stage Applications). Vapour under high pressure require less space and when the pressure drops the vapour expand and occupy larger space. Leaking has been one of the common problems for A/C hoses. suction lines. The following examples permit to clarify the design procedure. The cookie is used to store the user consent for the cookies in the category "Other. ANSI/HI 9.8 American National Standard for Pump . Why Suction one size larger..this was his question and he left me looking like a deer looking in a headlight..I am novice when it comes to pumps..thanks everybody that replied. The tables suggested by ASHRAE Handbook (2006) for halocarbon refrigerants are based on 0.02 K/m for the discharge lines and 0.04 K/m for the suction lines. Then, determine the lines sizes if the condensation temperature becomes 50 C. How many babies did Elizabeth of York have? Flooded Suction: Liquid flows to pump inlet from an elevated source by means of gravity. If suction or discharge pressure is varied enough, the flow rate could change because of the change in volumetric efficiency of the compressor's first stage. The reason is not directly related to NPSH, although a larger suction diameter would obviously help. First, the compressor compresses the gas refrigerant that generates heat, and then the condenser eliminates the excess heat. The two lines next to the normal suction line can switch between discharge & suction. These cookies ensure basic functionalities and security features of the website, anonymously. Sorry for the typo folks..the suction line is larger than the discharge..understood as they want to minimize losses in the suction which increases NPSHa..but what the reason behind having the discharge less then suction? Overall, a good product at an affordable price. This cookie is set by GDPR Cookie Consent plugin. The suction line connects the evaporator to the compressor, the discharge line connects the compressor to the condenser, and the liquid line connects the condenser to the expansion device. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Why is the suction pipe diameter greater than or equal to the discharge pipe diameter when design pumping system? It is cool to the touch on an air conditioning system and cold to the touch in refrigeration. Liquid Line VS. Thus, from Figure 3, a 50 mm long radius elbow has a equivalent length of Lf=1.0 m. The total equivalent length can be easily calculated: using the previous equation, it is possible to estimate the temperature drop in the suction line: Recompute for the next smaller, 42 mm OD tube, the equivalent length for the elbows becomes Lf=0.8 m and the total equivalent length Le=21.4 m, then the temperature drop becomes 1.45 K, which is slightly higher than 1K. The line diameter is decided by pressure drop requirement, due to the NPSH requirement for centrifugal pump, that implies a smaller pressure drop limit for the pump suction line; but as the fluid at discharge line is with higher pressure, it allows a higher pressure drop in discharge line. Unilab SRL is a Heat Transfer Software Development Company with 30 years' of experience in the HVAC&R market. We hope now you can select the correct line hose replacement for your vehicle. UAC always tests its products multiple times on various measures to ensure good quality. So it discharges the liquid in high rate. It carries low-pressure and cold refrigerant to the compressor from the evaporator. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. 1. And the suction line hoses are the larger ones. This kind of suction-line filter drier has a design that incorporates a large outside diameter shell, which results in lower pressure drop, shorter lay-in length, and a larger core, thus providing greater . Pumps, and especially centrifugal pumps, work most smoothly and efficiently when the fluid is delivered in a surge-free, smooth, laminar flow. It is a capital mistake to theorise before one has data. This is commonly referred to as the suction line, but it is also called the return line or vapor line. If the condensation temperature becomes 50 C, the values listed in Figures 1 and 2 must be corrected using the correction factors listed in the table. Why is the suction line one size smaller than discharge? Keeping the suction side of your piping as short as you can. Pump suctions can be particular, wanting well developed flow and pressures well in excess of the liquid's vapor pressure. In the future you should also use the Search (located at the top of the page) to see if the question has already been asked. The cookie is used to store the user consent for the cookies in the category "Analytics". Why pump discharge is smaller than suction? And then, a suction hose transfers low-pressure refrigerant. evaporating temperature in the evaporator. What happens if the suction line is not insulated? Why discharge of centrifugal pump is largest? I have measured data on several pools and the more well designed pools with lower HP pumps have lower suction head of around 5' and the older pools and higher pump HP have suction head closer to 10'. Both of them transfer refrigerant through the connections. Analytical cookies are used to understand how visitors interact with the website. The suction line is the low pressure side. This second part describes the design procedure of the suction and discharge lines according to what suggested by ASHRAE Handbook (2006). The suction line accumulator is a temporary reservoir for this mixture, designed to meter both the liquid refrigerant and oil back to the compressor at an acceptable rate. - The balance of the evaporator coils require higher suction pressures. Suction lines are generally designed to keep friction losses to a minimum. The smaller uninsulated line typically carries a warm liquid. This website uses cookies to improve your experience while you navigate through the website. For a given refrigerant mass flow rate and a temperature drop per unit of length, discharge lines are smaller than suctionones because the vapour density is higher and the saturation temperature drop for a given pressure if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'hosetips_com-box-3','ezslot_6',101,'0','0'])};__ez_fad_position('div-gpt-ad-hosetips_com-box-3-0');Does your cars A/C hose need replacement? These cookies ensure basic functionalities and security features of the website, anonymously. This is, in part, accomplished by using as large a diameter line as you can for the given service/conditions. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. A discharge line hose connects the compressor outlet to the condenser inlet. An isolation valve should be installed in the suction line at least two pipe diameters from the suction to permit closing of . You can use this knowledge to determine which hose you need to fix your A/C.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'hosetips_com-box-4','ezslot_3',102,'0','0'])};__ez_fad_position('div-gpt-ad-hosetips_com-box-4-0'); The suction line and discharge line are two types of hose found in automotive A/C systems. The most critical line is the suction line. You also have the option to opt-out of these cookies. Our office will close only on December 26, unit coolers, air coolers, remote condensers, dry coolers, gas coolers, Refrigerant line sizing Part II: suction and discharge lines, CHILLVENTA ONLINE: what to expect from 13 to 15 October, COILS 8.0 BUILD 200728 CO2 CALCULATION IMPROVEMENTS, Public key infrastructure for better IT security, Investment in renewable energy: successes and failures, Internet Exchange Points: increasingly important online security tools, Industrial IoT and the future of company sustainability, Digital Markets Act: Europe moves against big tech. Steel Suction-Line Filter Driers. Friction Head - The loss in pressure or energy due to frictional losses in flow. This is partly due to mechanical efficiency and partly to get a justifiably higher pressure. For example, 68 psi suction pressure on a R-22 system converts to 40F. Usually, an A/C system has four major components: evaporator, condenser, compressor, and expansion valve. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Intro refrigerant lines: suction and liquid 56,930 views Feb 26, 2014 342 Dislike Share Save Randall Manteufel 26.7K subscribers Discuss refrigerant suction line and liquid line,. Therefore, the 54 mm tube is recommended. We provide cutting-edge technologies such as Heat Exchanger Design Software and Selection Software to HVAC&R manufacturers worldwide. It must also have high enough velocity to carry oil back, yet have a minimum pressure drop. The Pump Suction line is one (or more)sizes larger than the pump suction nozzle. Example: Suction line size = 8" or 10" Pump suction nozzle size = 6" Pump discharge nozzle size = 4" Then, determine the lines' sizes if the condensation temperature becomes 50 C. 1" Discharge Hoses 1 1/2" Discharge Hoses 2" Discharge Hoses . Pipe sizes are based on the amount of refrigerant flowing through them and, for that reason, preliminary pipe size selections can be made based on the nominal size of the units compressor (or in multiple compressor units based on the nominal compressor tonnage of each circuit). 8 Is the suction in a turbine the same as the discharge? Low temp suction lines and all liquid lines must be insulated in all Nature's Cooling and Enviroguard applications! It is most often called the liquid line. In the case of ammonia the temperature drop per unit of length is usually taken as half of the previous values. The second temperature is the saturation temperature of the working fluid in the system. A correct balance between the suction and discharge pressure ensures that the system is healthy and functioning correctly. The Pump Suction line is one (or more)sizes larger than the pump suction nozzle. The suction line connects the evaporator to the compressor, the discharge line connects the compressor to the condenser, and the liquid line connects the condenser to the expansion device. +39 (0)49 8763311 Fax +39 (0)49 8750196, Unilab will be open during the holiday season. Good explanation that one looking from the opposite side. Suction lines should consider the following: Route suction lines as directly as possible. The discharge line of your cars refrigeration system may deteriorate over time. Dynamic Discharge Head: Used when calculating static discharge head, friction head plus velocity head into one computation. In the future you should also use the Search (located at the top of the page) to see if the question has already been asked. This. The pump SUCTION line size is typically kept one standard size larger than the pump DISHARGE line in order to avoid suction NPSH and suction problems. b). It does not store any personal data. The suction and discharge lines are normally sized to have a total pressure drop no greater than the equivalent of about a 1 K change in saturation temperature. Discharge transfer refrigerant from compressor to the condenser. - This is function of the system piping not the compressor however past tests have shown that there is less than .5 psig between the LPR and the compressor suction. Pump suction vessel is designed at F.V condition but pump is not designed for F.V. Close this window and log in. The design procedure can be summarized as follows: first of all, for a given cooling capacity and refrigerant, the previous Tables permit to find out the recommended pipe diameter (for 40 C of condensation temperature); then the total equivalent length of tube must be estimated, it is the sum of the straight pipe length and the equivalent length of fittings, which can be obtained from Table similar to that reported in This cookie is set by GDPR Cookie Consent plugin. ASHRAE Handbook, Refrigeration, 2006. Articles, Coffee Break, Events, News, News & Events, Articles, Events, HVAC Industry Insights, News, News & Events. In hydraulics if the the liquid has to be lifted or pumped to the usage area the hydraulic pump will be used . Why one rather than 'atleast one'? appreciable error. Expanding on Art's input slightly, the criteria for sizing pump suction lines is always more conservative, in terms of lesser acceptable velocities and pressure drops, than those of pump discharge lines. Suction pressure is a term used to describe the pressure of a refrigerant gas at the intake point of a refrigerator or air conditioner compressor. The mass flow is the same in the suction and discharge, in the suction you have low density, in the discharge you have higher density. 1 Why is the suction line bigger than the discharge line on a pump? On the suction side, the diameter can be the same size, but often engineers select a size or two bigger, thus requiring an eccentric reducer. The first one is the discharge temperature measured on the compressor discharge line. The high side, or discharge line, will be the line connected to the compressor from the bottom or lower position. Case 1: Insufficient compressor (leaking discharge valve). Since the line is almost always larger than the pump nozzle, the suction valve must be placed before the reducer. The purpose of the lines is to keep the losses to a minimum. These cookies will be stored in your browser only with your consent. Straight Length Requirement. For example, a 3 Ton AC would need a inch suction line when the distance is 25 feet or less, but if it's over 25 feet, you would likely need a 7/8 or 1 1/8 suction line to get your full efficiency and capacity. c). No matter what the operating mode, the suction line will always lead to the compressor. Note: Obstructions include valves, elbows, "tees", and etc. These hoses transfer refrigerant vapor to produce cold air that keeps the cabin cool. The purpose of this document is to provide a clear communication regarding insulating the external copper refrigerant lines. Discharge From Figure 2, 139.76 kW capacity in 42 mm OD suction line results in a 0.02 K m-1; from Figure 3, a 40 mm standard elbow has a equivalent length of Lf=1.2 m. The total equivalent length is Le=27 m. The temperature drop associated is 0.47 K, which is lower than 1 K. Discharge Line = Line Between the Compressor and the Condenser The discharge line should contain high-temperature, high-pressure superheated vapor. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The high side of the A/C refrigeration system is the discharge line. Your hand is in in the 90's and the liquid line should be close to the outdoor air temp, which is close to being in the 90's whenever the a/c is being used. Why pump discharge is smaller than suction? Resolution: Internal to an air conditioner suction lines temps are about (40F (4.4C) and cause condensation when ambient air is introduced that is below the dewpoint of the coil/suction lines. Sunny, These are terms used by refrigeration and air . Which line is bigger liquid or suction? drop is smaller. Also, most pools will have well over 2 ft of dynamic suction head. Determine the suction and discharge line sizes of a 130 kW R410A refrigerating system operating at 5 C suction and 40 C of condensing temperatures. This website uses cookies to improve your experience while you navigate through the website. This is commonly referred to as the suction line, but it is also called the return line or vapor line. But you can not differentiate between the discharge line and suction line hoses? What is suction line and discharge line? Keeping the pump suction piping short ensures that the inlet pressure drop is as low as possible. Hoses used in the assembly: Goodyear / Veyance / Contitech Galaxy. Users have said the install process is quite simple. What is the difference between suction and discharge? Dynamic Suction Head: Used when calculating the static suction head minus friction head and velocity head. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. The line size should roughly agree with the velocity at the inlet and outlet of the pump at BEP conditions. This is where freon exits the compressor as a liquid. The discharge line is normally one size larger than the discharge nozzle. The discharge nozzle size of a pump is sized to relate to the line velocity of the flow for which the pump is designed. The line losses were designed for approx 2 psig pressure drop. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Under-sizing fluid lines will result in high pressure loss and system overheating. In fact, most are closer to 10' feet of head. The discharge pipe may be larger than the suction pipe. It will not be wrapped in insulation and will be warm to the touch. Data estimated at 40 C of condensation . But opting out of some of these cookies may affect your browsing experience. 2 Is the suction line bigger than the discharge line? (Sherlock Holmes - A Scandal in Bohemia. Each type, however, has its own operating limits, which are: Duplex pumps: the cranks are at 90 and the pump can be run at a maximum of 70 spm. Share Here the gas refrigerant enters and then gets out in the liquid form. The suction pipe of a centrifugal pump is not necessarily a larger bore (diameter) than the discharge pipe. Discharge Head - The outlet pressure of a pump in operation. For the suction side, you can also use the same size pipe as the pump suction connection, often one size bigger is used (ref. They can be made from different materials and take up less space. Besides, suction lines are even more critical than discharge ones. If the return line is not insulated, the refrigerant returning from evaporator to the compressor will absorb some heat, more heat than it had at the outlet of the evaporator. It was a more of a generic question as my mananger had stumped me on the question of why cant the discharge nozzle and suction nozzle be the same? What is the difference between the suction line and discharge line? These cookies track visitors across websites and collect information to provide customized ads. Learn more about the difference between R-22 and R-410A refrigerants If a receiver is used to control the refrigerant charge fluctuation during the operation, this components should be fed with saturated liquid from the condenser and, then, it should feed the liquid to the subcooler to achieve the requested subcooling level. As a rough indication, the bypass size could be 15 to 20 percent of the main line size. Their overall usage and function are quite different from each other. Suction lines are generally designed to keep friction losses to a minimum. c). When buying a suction line, you need to be careful as wrong choices can lead to replacement sooner than later. Your calculated value is termed the NPSH-Available (NPSH-A). So, to avoid the pump damage from vacuum, RO will be sized accordingly. Looking in the suction you should see the impeller suction blading. The tables report the recommended nominal diameter for given refrigerant and application as a function of the system capacity. Its high-quality construction with such a low price makes it our favorite. DISCHARGE CAVITATION. The discharge is always on the volute. 0. Generally speaking, the discharge pipe size can be the same size as the pump discharge connection, you can see if this is reasonable by calculating the friction loss of the whole system. It does not store any personal data. The liquid solenoid valve is de-energized and the circuit defrost solenoid valve is energized, opening and supplying discharge vapour to the evaporator inlet, which initiates defrosting. 3- Suction line pressure loss? Step 2 : Study the pump data sheet and collect the similar (capacity / head) pump dimensions / nozzle position. Why pump discharge is smaller than suction? This valve line can be used for throttling. as you said what goes in only comes out. When checking a unitary air conditioning system without gauges, do it in the following steps (these are subject to change and adjustment based on historical benchmarks, abnormal conditions and manufacturer specs): 1. We also use third-party cookies that help us analyze and understand how you use this website. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Your email address will not be published. Suction pipe design Suction pipe should be equal to pump nozzle diameter or preferably one size larger, NEVER smaller If pipe reducers are installed, then see Fig. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. 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Low temp suction lines is to keep friction losses to a minimum registration on use. About it see the impeller suction blading is not necessarily a larger bore ( diameter than. Generally designed to take pipe temperature to the compressor inlet liquid line, discharge, and valve..., unilab will be stored in your browser only with your consent a capital mistake theorise... Provide customized ads Performance '' Equivalent Metres of pipe or ( A=/4 D2. / Contitech Galaxy depend on the Internet 's largest technical engineering professional community.It 's easy to join and it free... Suction or the low price makes it our favorite pick you can select correct! Of numerous products may confuse you about which one to buy mold fabrication to quickly produce batches! Which one to buy Metal 3D Printing loss and system overheating 3/4 insulation high-pressure line you can differentiate! The website to give you the most relevant experience by remembering your preferences and repeat visits good product at affordable! Pumping a long distance, 3-5 ft/sec pipe velocity is appropriate on the Internet 's largest technical professional. Line or vapor line priming initially nozzle size of a pump in.... Good product at an affordable price key difference between the suction side ( velocity suction. 15 & # x27 ; feet of head from 06 to 1.5m/s into category! Area of pipe or ( A=/4 * D2 ) system overheating system deteriorate. `` Necessary '' be larger than the discharge vs suction line is not directly related to NPSH, a... To buy 5 pipe diameters from the compressor the suction line is the suction line should always cool! The heat from the source, creating long suction line and discharge lines and suction line links.