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K factors

K factors for 2540
SCH 5S STAINLESS STEEL PIPE PER ANSI B36.19
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
1½ in.
115.19
30.433
2 in.
71.396
18.863
2 ½ in.
49.263
13.015
3 in.
32.636
8.622
3 ½ in. 
24.537
6.483
4 in.
19.135
5.055
5 in.
12.449
3.289
6 in.
8.4602
2.235
8 in.
4.9137
1.298
10 in.
3.1228
0.825
12 in.
2.1772
0.575
14 in.
1.7977
0.475
16 in.
1.3717
0.362
18 in.
1.0855
0.287
20 in.
0.8801
0.233
22 in.
0.7293
0.193
24 in.
0.6141
0.162
XS WROUGHT STEEL PIPE PER ANSI B36.10
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
1 ½ in.
161.79
42.745
2 in.
95.713
25.287
2 ½ in.
66.686
17.618
3 in.
42.986
11.357
3 ½ in. 
31.983
8.45
4 in.
24.668
6.517
5 in.
15.48
4.09
6 in.
10.691
2.825
8 in.
5.9733
1.578
10 in.
3.6489
0.964
12 in.
2.4548
0.649
14 in.
1.9931
0.527
16 in.
1.497
0.396
18 in.
1.1727
0.31
20 in.
0.9388
0.248
22 in.
0.7685
0.203
24 in.
0.6446
0.17
SCH 40S STAINLESS STEEL PIPE PER ANSI B36.19
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
1 ½ in.
140.03
36.996
2 in.
83.24
21.992
2 ½ in.
59.034
15.597
3 in.
38.675
10.218
3 ½ in. 
28.752
7.596
4 in.
22.226
5.872
5 in.
14.061
3.715
6 in.
9.516
2.514
8 in.
5.4523
1.441
10 in.
3.4507
0.912
12 in.
2.3318
0.616
SCH 40 STAINLESS STEEL PIPE
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
14 in.
1.9556
0.517
16 in.
1.497
0.396
18 in.
1.19
0.314
20 in.
0.9577
0.253
24 in.
0.6662
0.176
SCH 10S STAINLESS STEEL PIPE PER ANSI B36.19
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
1½ in.
127.93
33.799
2 in.
76.439
20.195
2 ½ in.
51.946
13.724
3 in.
34.174
9.029
3½ in.
25.571
6.756
4 in.
19.829
5.239
5 in.
12.73
3.363
6 in.
8.5938
2.27
8 in.
5.0062
1.323
10 in.
3.1793
0.84
12 in.
2.1914
0.579
14 in.
1.8147
0.479
16 in.
1.3798
0.365
18 in.
1.0912
0.288
20 in.
0.8855
0.234
22 in.
0.7334
0.194
24 in.
0.6175
0.163
STD WROUGHT STEEL PIPE PER ANSI B36.10
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
1 ½ in.
140.03
36.996
2 in.
83.24
21.992
2 ½ in.
59.034
15.597
3 in.
38.674
10.218
3 ½ in. 
28.752
7.596
4 in.
22.226
5.872
5 in.
14.061
3.715
6 in.
9.516
2.514
8 in.
5.4523
1.441
10 in.
3.4507
0.912
12 in.
2.3318
0.616
14 in.
1.9186
0.507
16 in.
1.4483
0.383
18 in.
1.139
0.301
20 in.
0.9146
0.242
22 in.
0.7506
0.198
24 in.
0.6311
0.167
SCH 40 WROUGHT STEEL PIPE PER ANSI B36.10
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
1 ½ in.
140.03
36.996
2 in.
83.24
21.992
2- ½ in.
59.034
15.597
3 in.
38.674
10.218
3 ½ in. 
28.752
7.596
4 in.
22.226
5.872
5 in.
14.061
3.715
6 in.
9.516
2.514
8 in.
5.4523
1.441
10 in.
3.4507
0.912
12 in.
2.3517
0.621
14 in.
1.9556
0.517
16 in.
1.497
0.396
18 in.
1.19
0.314
20 in.
0.9577
0.253
24 in.
0.6662
0.176
SCH 80S STAINLESS STEEL PIPE PER ANSI B36.19
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
1 ½ in.
161.79
42.745
2 in.
95.71
25.287
2 ½ in.
66.686
17.618
3 in.
42.986
11.357
3 ½ in. 
31.983
8.45
4 in.
24.668
6.517
5 in.
15.48
4.09
6 in.
10.691
2.825
8 in.
5.9733
1.578
10 in.
3.6489
0.964
12 in.
2.4548
0.649
SCH 80 STAINLESS STEEL PIPE
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
14 in.
2.1557
0.57
16 in.
1.6444
0.434
18 in.
1.3036
0.344
20 in.
1.0533
0.278
22 in.
0.8689
0.23
24 in.
0.7335
0.194
SCH 80 WROUGHT STEEL PIPE PER ANSI B36.10
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
1 ½ in.
161.79
42.745
2 in.
95.713
25.287
2 ½ in.
66.686
17.618
3 in.
42.986
11.357
3 ½ in. 
31.983
8.45
4 in.
24.668
6.517
5 in.
15.48
4.09
6 in.
10.691
2.825
8 in.
5.9733
1.578
10 in.
3.7983
1.004
12 in.
2.6198
0.692
14 in.
2.1557
0.57
16 in.
1.6444
0.434
18 in.
1.3036
0.344
20 in.
1.0533
0.278
22 in.
0.8689
0.23
24 in.
0.7335
0.194
SCH 40 Plastic pipe per ASTM-D-1785
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
1 ½ in.
139.85
36.948
2 in.
82.968
21.92
2 ½ in.
60.194
15.903
3 in.
39.513
10.439
3 ½ in. 
29.295
7.74
4 in.
22.565
5.962
5 in.
14.308
3.78
6 in.
9.863
2.606
8 in.
5.64
1.49
10 in.
3.4476
0.911
12 in.
2.3786
0.628
SCH 80 Plastic pipe per ASTM-D-1785
Pipe size
K-Factor
K-Factor
(inches)
U.S. GAL
LITER
1 ½ in.
162.29
42.877
2 in.
97.186
25.677
2 ½ in.
68.559
18.113
3 in.
43.87
11.59
3 ½ in. 
32.831
8.674
4 in.
25.25
6.671
5 in.
15.835
4.184
6 in.
11.041
2.917
8 in.