Equivalent Length of Fittings

Transcription

1 Equivalent Length of Fittings This section provides the equivalent length of piping pressure loss for several ProPEX fittings. The equivalent length is used to approximate the impact the fittings have on pressure loss across the piping length. The equivalent length for each fitting is shown in the tables below. Add the equivalent length to the total piping length for each fitting installed along the piping run. The total pressure loss is then computed from the adjusted total piping length. Equivalent lengths are commonly utilized to calculate the Total Developed Length (TDL) along a critical piping path. All Uponor values represent pressure loss at 8 ft./sec. Many methods exist for calculating the coefficient of velocity (C v ) across valves and fittings. The proceeding set of Uponor data was derived from empirical testing performed by NSF International and tested to ISA-S75.02 Pressure Drop Measurement and C v Calculations at a measured and verified flow rate. In order to calculate equivalent length in feet, a quadratic equation is utilized to determine pressure drop versus flow data at precisely 8 ft./sec. Other common methods for calculating C v include UL 82 Thermoplastic Sprinkler Pipe and Fittings for Fire Protection and the use of flow modeling software. Through extensive testing and validation by NSF International, Uponor has built a complete and accurate data set for AquaPEX Plumbing Systems. When comparing equivalent length data across PEX fitting manufacturers, values may differ due to different testing methods and reported values at specific flow velocities other than 8 ft./sec. For comparison purposes, NSF International tested commonly available ASTM F807 Brass Insert Fittings Utilizing Copper Crimp Ring for PEX Tubing Fittings and ASTM F259 Plastic Insert Fittings Utilizing Copper Crimp Rings for PEX Tubing Fittings to the ISA-S75.02 test method using the same quadratic equation as the Uponor ProPEX Fittings to determine pressure drop versus flow data at precisely 8 ft./sec. Reference Table 4- for equivalent length comparisons. Fittings Nominal Size (in) ASTM F960 ASTM F 807 ASTM F 259 Uponor ProPEX Eq. Length Brass Crimp Ring Eq. Length Plastic Crimp Ring Eq. Length 960 vs vs % 50.00% Tee-Run % 08.00% % 8.54% % 4.49% Tee-Branch % 9.2% % 58.82% % 0.0% Elbow % 50.09% % 48.26% % 78.75% Coupling % % % % Table 4-: Equivalent Length Comparison of Various PEX Fitting Types 54 Chapter 4 Pipe Sizing

2 Equivalent Length of Uponor fittings The equivalent length for each fitting is shown in the tables below. Add the equivalent length to the total piping length for each fitting installed along the piping run. The total pressure loss is then computed from the adjusted total piping length. 2 x 2 x 2 4 x 4 x 4 x x EP Reducing Tees Flow/Port Avg. C v Eq. Length (ft) 4 x 2 x 2 4 x 2 x 4 4 x 4 x 2 Through Branch Through Branch Through Branch x 4 x Branch x 4 x 4 x 4 x x x 2 x x 4 4 x x 4 4 x x EP Tees Flow/Port Avg. C v Eq. Length (ft) 4 x 4 x 4 2 x 2 x 2 2 x 2 x 2 4 x 4 x 2 4 x 4 x 4 Through Branch.4 6. Through Branch Through 0.5. Branch. 2.7 Through Branch Through Branch Through Branch Through Branch Through Branch Through Branch Through Branch Through Branch Through.7.0 Branch Through Branch 4..9 Through Branch EP Reducing Tees Flow/Port Avg. C v Eq. Length (ft) Through x 4 x Branch Through x x 4 Branch Through x x Branch Through x x 2 Branch Through x 4 x 4 Branch 6.. Through x 4 x Branch.2. Through x 4 x 4 Branch Through x 2 x 2 Branch.4 6. Through x 2 x 4 Branch Through x 2 x Branch Through x 2 x 4 Branch.7 4. Through x 2 x 4 Branch Through x 2 x Branch Through x 2 x 4 Branch Through x 2 x 2 Branch Through x 2 x 2 Branch Through x 2 x 2 Branch Through x 2 x 4 Branch x 2 x Through Branch Through x 2 x 4 Branch Through x 2 x 2 Branch Plumbing Design Assistance Manual Chapter 4 Pipe Sizing 55

3 EP Coupling Nominal Size (in) Flow Path Avg. C v Eq. Length (ft) 2 x 2 Through x 2 Through x 4 Through x 4 Through x Through x 4 Through x Through x 4 Through x 4 Through x Through x 4 Through x 2 Through x 2 Through x 2 Through º Elbow Nominal Size (in) Flow Path Avg. C v Eq. Length (ft) 2 Through Through º Elbow Nominal Size (in) Flow Path Avg. C v Eq. Length (ft) 2 Through Through Through Through Through Through Sweat Adapters Nominal Size (in) Flow Path Avg. C v Eq. Length (ft) 2 PEX x 2 Copper Through PEX x 4 Copper Through PEX x 2 Copper Through PEX x 4 Copper Through PEX x Copper Through PEX x Copper Through PEX x 4 Copper Through PEX x 2 Copper Through PEX x 2 Copper Through Chapter 4 Pipe Sizing

4 Fitting Adapters Nominal Size (in) Flow Path Avg. C v Eq. Length (ft) 2 PEX x 2 Copper Through PEX x 4 Copper Cu to PEX PEX x 2 Copper PEX to Cu PEX x 4 Copper Through PEX x Copper Cu to PEX.4. PEX x Copper Through PEX x 4 Copper Through PEX x 2 Copper Through PEX x 2 Copper Through Male Adapters Nominal Size (in) Flow Path Avg. C v Eq. Length (ft) 2 PEX x 2 MNPT Through PEX x 4 MNPT NPT to PEX PEX x 4 MNPT Through PEX x MNPT NPT to PEX PEX x 4 MNPT PEX to NPT PEX x MNPT Through PEX x 4 MNPT Through PEX x 2 MNPT Through PEX x 2 MNPT Through Female Adapters Nominal Size (in) Flow Path Avg. C v Eq. Length (ft) 2 PEX x 2 FNPT Through PEX x 4 FNPT NPT to PEX PEX x 4 FNPT Through PEX x NPT NPT to PEX PEX x FNPT Through PEX x 4 FNPT Through PEX x 2 FNPT Through PEX x 2 FNPT Through PEX x 2 MNPT Through Brass Ball Valve (large bore) Nominal Fitting Size Equivalent Length (ft) Cv 2" Brass Ball Valve (full port) Nominal Fitting Size Equivalent Length (ft) Cv 4" " " Plumbing Design Assistance Manual Chapter 4 Pipe Sizing 57

5 Elbows EP Multiport Elbows Flow/Port Avg. C v Eq. Length (ft) EP Flow-through Multiport Elbow, outlets, 4" x 4" ProPEX EP Flow-through Multiport Elbow, 4 outlets, 4" x 4" ProPEX " EP Branch Multiport Elbow, 0 outlets with mounting clips Through # Through # # Flow-through EP Flow-through Multiport Tees Flow/Port Avg. C v Eq. Length (ft) 2 outlets, 4" x 4" ProPEX outlets, 2" x 2" ProPEX outlets, " x 4" PEX outlets, 4" x 4" ProPEX 4 outlets, 4" x 4" ProPEX 4 outlets, " x " PEX 4 outlets, " x 4" ProPEX 6 outlets, " x 4" ProPEX 6 outlets, 4" x 4" ProPEX 6 outlets, " x " ProPEX Through 5..6 # Through # Through.6.2 # Through # Through # Through # Through.7.0 # Through.8. # Through.2.8 #.7 5. Through #. 7.6 Vertical EP Flow-through Multiport Vertical Tee EP Flow-through Multiport Vertical Tee, outlets, 4" x 4" x 4" ProPEX Flow/Port Avg. C v Eq. Length (ft) Tee to Tee.6 2. Tee to Side Tee to # Side to Tee Side to # Chapter 4 Pipe Sizing

6 Branch EP Branch Multiport Tees Flow/Port Avg. C v Eq. Length (ft) 4" EP Branch Multiport Tee, outlets # " EP Branch Multiport Tee, 4 outlets # " EP Branch Multiport Tee, 4 outlets #. 6.7 " EP Branch Multiport Tee, 6 outlets # " EP Branch Multiport Tee, 6 outlets # " EP Branch Multiport Tee, 7 outlets with mounting clips " EP Branch Multiport Tee, 7 outlets with mounting clips 4" EP Branch Multiport Tee, 8 outlets with mounting clips " EP Branch Multiport Tee, 8 outlets with mounting clips # # # # Opposing EP Opposing-port Multiport Tees 4" EP Branch Opposing-port Multiport Tee, outlets EP Flow-through Opposing-port Multiport Tee, outlets, 4" x 4" ProPEX 4" EP Branch Opposing-port Multiport Tee, 4 outlets EP Flow-through Opposing-port Multiport Tee, 4 outlets, 4" x 4" ProPEX EP Flow-through Opposing-port Multiport Tee, 6 outlets, 4" x 4" ProPEX 4" EP Branch Opposing-port Multiport Tee, 8 outlets Flow/Port Avg. C v Eq. Length (ft) # Through # # Through 6.9. #.4 6. Through 6.4. # # Plumbing Design Assistance Manual Chapter 4 Pipe Sizing 59