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The size of this pipe can be 3/8” up to 25 tons capacity, and 1/2” up to 60 tons. Calculate friction losses for fittings and valves in a section of pipe expressed in equivalent length of pipe (in feet). PVC - Friction Loss in Fittings and Equivalent Length - Minor loss in PVC and CPVC fittings as equivalent length of straight pipe PVC Pipes - Friction Loss and Flow Velocities Schedule 80 - Water flow in thermoplastic PVC and CPVC pipes Schedule 80 - friction loss (ft/100 ft, psi/100 ft) and flow velocities at dimensions ranging 1/2 to 16 inches The equivalent lengths for fitting are listed in special tables reported by ASHRAE handbook (2006). refrigerant. On the data sheet, it states that the piping length should not exceed 20m. Equivalent Refrigeration Piping Length to Include Fittings, Controls Devices ASHRAE[7] and some air conditioner manufacturers such as McQuay[6 ] provide a refrigeration piping guide that gives complete, detailed guidance and charts on refrigerant line sizing (diameter) as a function of length of run. My questions: 1) How much would the efficiency typically drop if I would exceed the max piping length by 5m 2) How much would the capacity of the unit drop if I would exceed the max piping length by 5m 3) I have over-sized ALL the units by about 20-30%. NOTE Maximum lifts are dependent on total length, Equivalent length is defined as the length of straight pipe having the same energy loss as a fitting. The small equalizer line from the receiver to the inlet piping of the condenser should have a valve for shutting off the receiver. See Table 1 for equivalent lengths of commonly used fittings and accessories; maximum equivalent length allowed is up to 250 ft (76.2 m) See Tables 3, 5, 8, 11, 12 and 13 for maximum total equivalent length. Example: Your section of 2" pipe has 2 x gate valves, 2 x 90° elbows, 4 x straight true tee's and 12 branch tee's Select 2" for nominal pipe size and enter 2 gate valves, 2 90° elbows, 4 straight true tee's and 12 branch tee's. When designing a system, the engineer needs to maintain a solid column of liquid refrigerant … Maximum linear (actual) length = 200 feet. HCFC−22 Total equivalent length = 240 feet (Piping and all fittings, etc). NOTE Length is general guide. Equivalent Length of Fittings and Valves The application is best viewed using a resolution of 1024x768 pixels. Fittings added to a refrigerant line induce an added pressure drop in the line. For calculating Pressure Drop across a pipe route, we need to calculate the total Notice the phrase "Equivalent Feet" (applies to meters as well). This application is a calculator for calculating ‘Equivalent Length of Fittings and Valves’. length”. length of straight tubing that would have thesame pressure loss as the fitting. Please set your resolution to this if it is not set so. Maximum linear liquid lift = 50 feet. The equivalent length of run equals the actual measured length of pipe plus the equivalent straight pipe length of the fittings and valves. Table 8-12 lists equivalent lengths of the more common fittings and valves and is an example of the data provided by the ASHRAE for sizing pipes. Most of the refrigeration text books will have tables showing the approximate resistance of common fittings expressed as an equivalent length of pipe. The added pressure drop is accounted for by adding extra length (see chart on page MI-11) to the piping run which will equal the same pressure drop produced by the fittings. Standard Elbow Medium Radius Elbow Long Radius Elbow 45° Elbow Tee Return Bend Gate Valve Open Globe Valve Open Angle Valve Open Length of Straight Pipe Giving Equivalent Resistance Flow ½" 1.5 1.4 1.1 .77 3.4 3.8 .35 16 8.4 Table 3 - Friction Losses Through Pipe Fittings in Terms of Equivalent Lengths of Standard Pipe Size of Pipe (Small Dia.) Then, the total equivalent length Le from condenser to throttling device or from receiver to subcooler must be estimated, this value is the sum of the straight pipe length and the equivalent length for fitting (elbows, contraction, etc.). Lengths may be more or less, depending on remaining system design factors.

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