Pipe Size Diameter (ins) Diameter (ins) Diameter (ins) Velocity Loss in Flow (ins) Outside Inside Outside Inside Outside Inside Ft/sec PD'/100 GPM 3 3.96 3.06 3.96 3.00 3.1 4.5 100 4 5.00 4.04 5.00 3.96 2.8 5.1 200 6 7.10 6.08 7.10 6.00 7.22 6.00 2.9 6.8 600 8 9.30 8.18 9.30...
PEXSUPPLY RESOURCES GPM Chart for Copper & PEX Pipe Tubing Size/Type Minimum Flow Rate1 (gpm) 3/8" Copper 1/2" Copper 3/4" Copper 1" Copper 1.25" Copper 1.5" Copper 2" Copper 2.5" Copper 3" Copper 1.0 1.6 3.2 5.5 8.2 11.4 19.8 30.5 43.6 3/8" PEX 1/2" PEX 5/8" PEX 3/...
gpm = gallons per minute (USA gallons not imperial gallons) d = inside diameter of the pipe in inches The empirical nature of the friction factor C hw means that the Hazen-Williams formula is not suitable for accurate prediction of head loss. The friction loss results are only valid for ...
VELOCITY TO GPM CONVERSIONS in standard wall pipes* Flow Velocity (ft/sec) x Factor (1 ft/sec) = GPM Typical HVAC Design Maximum Flow = 4 to 8 ft/sec Nominal GPM @ GPM @ GPM @ GPM @ GPM @ GPM @ Pipe Size 1 ft/sec 2 ft/sec 4 ft/sec 8 ft/sec 10 ft/sec 12 ft/sec...
Use a flow vs. pipe-loss data chart to determine the pressure-drop flow correlation. Reading this type of table, the flow rate corresponding to 3.8 psi loss to 100 feet of 2-inch Schedule 40 PVC plastic pipe is 75 gpm. 4. Determine the Pressure Loss ...
Pipe Schedule and Size Pipe Outer Diamater (OD) 0.84inches Pipe Inner Diamater (ID) 0.622inches Wall thickness 0.109inches Velocity and Friction Loss Velocity and Friction Loss are derived from the the nominal pipe size chosen fromPipe Schedule and Sizeand pump flow rate....
Since you can also use schedule 40 pipe for a return line, you can check the schedule 40 chart again to determine the proper pipe size. By looking in the 15 feet per second column of Table 2, you find that a 1-inch return line can deliver up to 40.6 GPM without exceeding 15 feet ...
For 20 gpm, cross-section area for flow required. A=20gpm7.48gal./ft3(60s/min)(6ft/s)=0.007427ft2=(0.007427)(144)=1.0695in.2 Pipe diameter is D=4Area/π,in.D=(4)(1.0695)/π=1.167in. (Note: Usually do not select this size. Could go to 1 1/2 in. However, velocity would be...
in the loop or friction of the loop. Another method for determining the pump head is to measure the longestpipe run in the loopand then adding the friction loss for each valve, elbow, and fitting. This requires the use of achart that can be obtained from your HVAC circulator pumpsupplier...
GPM Gallons Per Minute GR Grade GaV Gate Valve GIV Globe Valve H HCV Hand Control Valve HDR Header HIC Hand Indicating Controller HLL High Liquid Level HOR Horizontal HP High Pressure HPFS High Point Finished Surface HPP High Point Paving HR Hanger Rod HR Hour HTR Heater HVAC Heating, Ventilat...