Pressure Rating for Pex
Content
Pressure Rating for PEX by Canarsee.Com
PEX plumbing system Sizing and Design
These tables can be used to help designing a plumbing system using non-barrier PEX tubing.
Pressure Drop Rating for PEX Tubing - psi/ft
3/8"
GPM
1/2"
Pressure
Velocity
Drop
(ft/sec)
Pressure
Drop
3/4"
Velocity
(ft/sec)
Pressure
Drop
1"
Velocity
(ft/sec)
Pressure
Drop
Velocity
(ft/sec)
0.5
0.020
1.7
0.004
0.9
0.001
0.5
0.000
0.3
1
0.070
3.3
0.016
1.8
0.003
0.9
0.001
0.5
1.5
0.149
5.0
0.034
2.7
0.006
1.4
0.002
0.8
2
0.254
6.7
0.057
3.6
0.011
1.8
0.003
1.1
2.2
0.303
7.3
0.069
4.0
0.013
2.0
0.004
1.2
2.5
0.384
8.3
0.087
4.5
0.016
2.3
0.005
1.4
3
0.538
10.0
0.122
5.4
0.023
2.7
0.007
1.6
4
0.207
7.2
0.039
3.6
0.011
2.2
5
0.313
9.1
0.058
4.5
0.017
2.7
6
0.439
10.9
0.082
5.4
0.024
3.3
7
0.583
12.7
0.109
6.4
0.032
3.8
8
0.139
7.3
0.041
4.4
9
0.173
8.2
0.051
4.9
10
0.210
9.1
0.062
5.5
11
0.251
10.0
0.074
6.0
12
0.294
10.9
0.087
6.6
13
0.341
11.8
0.101
7.1
14
0.116
7.7
15
0.132
8.2
16
0.148
8.8
17
0.166
9.3
18
0.184
9.9
19
0.204
10.4
20
0.224
11.0
21
0.245
11.5
22
0.267
12.1
23
Note: Few of states plumbing codes require that liquid velocity through system cannot exceed 8 ft/s. This cut -off is
highlighted on the second table with name "Pressure Drop Rating for PEX Tubing". The maximum velocity on this chart
is 12 feet/second.
Copyright © 2010-2015 Canarsee.Com
Pressure Rating for PEX Tubing by
Canarsee.Com
PEX Fitting Equivalent Length Chart
Equivalent Tubing Length: Along with the pressure loss through the supply tubing, any pressure loss through
fittings, shut off valves, ball valves, manifolds in the system must be taken into account. Below is a table that
shows the equivalent length of tubing in feet per one PEX fitting.
PEX Fitting Equivalent Length (Feet of Tubing)
PEX Brass Fitting
PEX Tubing Size
3/8"
1/2"
3/4"
Coupling
2.7
2.8
3.5
1"
1.0
Elbow
9.2
8.0
9.2
7.8
Tee - Branch
9.6
7.1
8.6
5.5
Tee - Run
3.3
2.4
3.5
2.7
Copyright © 2010-2015 Canarsee.Com
PEX plumbing system Sizing and Design
These tables can be used to help designing a plumbing system using non-barrier PEX tubing.
Pressure Drop Rating for PEX Tubing - psi/ft
3/8"
GPM
1/2"
Pressure
Velocity
Drop
(ft/sec)
Pressure
Drop
3/4"
Velocity
(ft/sec)
Pressure
Drop
1"
Velocity
(ft/sec)
Pressure
Drop
Velocity
(ft/sec)
0.5
0.020
1.7
0.004
0.9
0.001
0.5
0.000
0.3
1
0.070
3.3
0.016
1.8
0.003
0.9
0.001
0.5
1.5
0.149
5.0
0.034
2.7
0.006
1.4
0.002
0.8
2
0.254
6.7
0.057
3.6
0.011
1.8
0.003
1.1
2.2
0.303
7.3
0.069
4.0
0.013
2.0
0.004
1.2
2.5
0.384
8.3
0.087
4.5
0.016
2.3
0.005
1.4
3
0.538
10.0
0.122
5.4
0.023
2.7
0.007
1.6
4
0.207
7.2
0.039
3.6
0.011
2.2
5
0.313
9.1
0.058
4.5
0.017
2.7
6
0.439
10.9
0.082
5.4
0.024
3.3
7
0.583
12.7
0.109
6.4
0.032
3.8
8
0.139
7.3
0.041
4.4
9
0.173
8.2
0.051
4.9
10
0.210
9.1
0.062
5.5
11
0.251
10.0
0.074
6.0
12
0.294
10.9
0.087
6.6
13
0.341
11.8
0.101
7.1
14
0.116
7.7
15
0.132
8.2
16
0.148
8.8
17
0.166
9.3
18
0.184
9.9
19
0.204
10.4
20
0.224
11.0
21
0.245
11.5
22
0.267
12.1
23
Note: Few of states plumbing codes require that liquid velocity through system cannot exceed 8 ft/s. This cut -off is
highlighted on the second table with name "Pressure Drop Rating for PEX Tubing". The maximum velocity on this chart
is 12 feet/second.
Copyright © 2010-2015 Canarsee.Com
Pressure Rating for PEX Tubing by
Canarsee.Com
PEX Fitting Equivalent Length Chart
Equivalent Tubing Length: Along with the pressure loss through the supply tubing, any pressure loss through
fittings, shut off valves, ball valves, manifolds in the system must be taken into account. Below is a table that
shows the equivalent length of tubing in feet per one PEX fitting.
PEX Fitting Equivalent Length (Feet of Tubing)
PEX Brass Fitting
PEX Tubing Size
3/8"
1/2"
3/4"
Coupling
2.7
2.8
3.5
1"
1.0
Elbow
9.2
8.0
9.2
7.8
Tee - Branch
9.6
7.1
8.6
5.5
Tee - Run
3.3
2.4
3.5
2.7
Copyright © 2010-2015 Canarsee.Com
