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Since all PEX tubing used in the US is manufactured to the same ASTM and dimensional (SDR) standards, these specifications are universal. Manufacturing tolerances and other details can be found in manufacturers’ manuals.
PEX Tubing size (CTS/Nominal) |
Outside Diameter (OD) |
Minimum wall thickness | Inside Diameter (ID) |
Volume gal/100ft | Weight lbs/100ft |
---|---|---|---|---|---|
3/8″ | 0.500″ | 0.070″ | 0.360″ | 0.50 | 4.50 |
1/2″ | 0.625″ | 0.070″ | 0.485″ | 0.92 | 5.80 |
5/8″ | 0.750″ | 0.083″ | 0.584″ | 1.34 | 8.38 |
3/4″ | 0.875″ | 0.097″ | 0.681″ | 1.83 | 11.00 |
1″ | 1.125″ | 0.125″ | 0.875″ | 3.03 | 17.06 |
Notes:
PEX Tubing Pressure Ratings | Pressure testing – Hydronic & Radiant Heating | Pressure testing – Hot & Cold Water Plumbing |
---|---|---|
200°F at 80 psi 180°F at 100 psi 74°F at 160 psi |
3 times the maximum working pressure or a minimum of 40 psi, but no greater than 100 psi.
Duration: 30 minutes minimum, 2 hours recommended |
1.5 times the maximum working pressure but no greater than pipe’s pressure rating at given temperature.
Duration: 30 minutes minimum, 2 hours recommended |
Notes:
Pressure Drop Table (psi per 100ft of tubing length)
Flow rate, GPM | PEX tubing size | ||||
---|---|---|---|---|---|
3/8″ | 1/2″ | 5/8″ | 3/4″ | 1″ | |
0.5 | 2.50 | 0.51 | 0.21 | 0.05 | 0.02 |
1.0 | 7.50 | 1.70 | 0.71 | 0.34 | 0.10 |
2.0 | 26.1 | 5.30 | 2.12 | 1.02 | 0.35 |
3.0 | 54.1 | 11.0 | 4.36 | 2.10 | 0.63 |
4.0 | 18.4 | 7.36 | 3.53 | 1.06 | |
5.0 | 27.4 | 11.0 | 5.26 | 1.58 | |
6.0 | 38.1 | 15.3 | 7.30 | 2.19 | |
7.0 | 20.1 | 9.63 | 2.89 | ||
8.0 | 25.6 | 12.3 | 3.68 | ||
9.0 | 31.7 | 15.1 | 4.55 | ||
10.0 | 18.3 | 5.50 | |||
11.0 | 21.7 | 6.52 | |||
12.0 | 25.4 | 7.63 | |||
13.0 | 8.81 | ||||
14.0 | 10.1 | ||||
15.0 | 11.4 |
1 psi = 2.3 ft of head (for fresh water), or 1 ft of head = 0.434 psi
Bending radius
Tubing size | Minimum bending radius | Minimum bending diameter (OC) |
---|---|---|
3/8″ | 4″ | 8″ |
1/2″ | 5″ | 10″ |
5/8″ | 6″ | 12″ |
3/4″ | 7″ | 14″ |
1″ | 9″ | 18″ |
Minimum recommended bending radius is 8 times the outside diameter of PEX
(8 x OD). For 1/2″ PEX with OD of 5/8″, minimum bending radius is 8 x 5/8″ = 5″.
Over-bending the PEX pipe, deforms its’ round shape, restricts flow and over-stresses the pipe.
Note:Â minimum bending diameter only refers to the 90-degree and 180-degree (U-shaped) bends. Parallel runs of pipe can be spaced as close as necessary.
Elongation (linear expansion)
Typical elongation is anywhere from 1″ to 2.5″ for every 100ft of PEX pipe at a 10°F temperature rise.
Since PEX expands and contracts with temperature changes, it should be secured so as to provide sufficient space for expansion to occur.
All types (A, B, C) of PEX tubing are compatible with Crimp, Clamp or Push-to-connect type connection systems:
ASTM F876: Standard Specification for Crosslinked Polyethylene (PEX) Tubing.
ASTM F877: Standard Specification for Crosslinked Polyethylene (PEX) Plastic Hot- and Cold- Water Distribution Systems.
ASTM F2023: Oxidative resistance of PEX to Hot Chlorinated Water per NSF protocol P171 (Non-Barrier PEX Tubing).
CSA B137.5: Crosslinked Polyethylene (PEX) Tubing Systems for Pressure Applications.
NSF/ANSI 14, nsf-rfh: Evaluated for use in Radiant Floor Heating (NSF-rfh) Applications (Oxygen Barrier PEX tubing).
NSF/ANSI 61-G, NSF/ANSI 372, nsf-pw-g: Complies with NSF/ANSI standard 61-G for Lead-Free Drinking Water System Components (Non-Barrier PEX Tubing).
UPC listed by IAPMO (International Association of Plumbing and Mechanical Officials).