Guide To Pool Heating

Page 45 of 51

FRICTION LOSS IN 2” PLASTIC PIPE

Feet of head per 100 feet of Schedule 40 PVC pipe
Flow RateVelocityFriction Loss

(Gallons per Minute)(Feet per Second)(Feet per 100 feet of pipe)

7
8
9
10
12
14
16
18
20
22
24
26
28
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100

.67
.77
.86
.96
1.15
1.34
1.53
1.72
1.91
2.10
2.29
2.49
2.68
2.87
3.35
3.82
4.30
4.78
5.26
5.74
6.21
6.69
7.17
7.65
8.13
8.61
9.08
9.56

.12
.15
.19
.23
.34
.44
.56
.68
.83
.98
1.15
1.33
1.56
1.74
2.20
2.86
3.40
4.30
5.00
5.80
6.70
7.50
8.60
9.55
10.7
11.8
13.2
14.4

FRICTION LOSS IN FITTINGS

Equivalent length of straight pipe in feet

Size of Pipe ‘

1/2”

3/4”

1”

1 1/4”

1 1/2”

2”

3”

4”

Gate valve (open)
90º Elbow
45º Elbow
Tee (straight thru)
Tee (thru side)
Swing check valve

0.6
3.6
0.7
1.8
4.3
8.1

0.7
4.5
0.9
2.5
5.4
8.9

0.9
5.3
1.4
3.3
6.7
11.2

1.2
6.7
1.8
4.7
8.8
13.1

1.3
7.5
2.2
5.7
10.0
15.2

1.6
8.6
2.8
7.8
12.1
19.1

2.0
11.1
4.1
12.1
17.1
27.1

2.7
13.1
5.6
17.1
21.2
38.2