Page 936 - 2018_IRC

APPENDIX P

TABLE AP103.3(5)
ALLOWANCE IN EQUIVALENT LENGTHS OF PIPE FOR FRICTION LOSS IN VALVES AND THREADED FITTINGS (feet)
PIPE SIZE (inches)
FITTING OR VALVE
1 3 1 1 1 1 2 2 1 3
/ 2 / 4 / 4 1 / 2 / 2
45-degree elbow 1.2 1.5 1.8 2.4 3.0 4.0 5.0 6.0
90-degree elbow 2.0 2.5 3.0 4.0 5.0 7.0 8.0 10.0
Tee, run 0.6 0.8 0.9 1.2 1.5 2.0 2.5 3.0
Tee, branch 3.0 4.0 5.0 6.0 7.0 10.0 12.0 15.0
Gate valve 0.4 0.5 0.6 0.8 1.0 1.3 1.6 2.0
Balancing valve 0.8 1.1 1.5 1.9 2.2 3.0 3.7 4.5
Plug-type cock 0.8 1.1 1.5 1.9 2.2 3.0 3.7 4.5
Check valve, swing 5.6 8.4 11.2 14.0 16.8 22.4 28.0 33.6
Globe valve 15.0 20.0 25.0 35.0 45.0 55.0 65.0 80.0
Angle valve 8.0 12.0 15.0 18.0 22.0 28.0 34.0 40.0
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 degree = 0.0175 rad.

TABLE AP103.3(6)
PRESSURE LOSS IN FITTINGS AND VALVES EXPRESSED AS EQUIVALENT LENGTH OF TUBE (feet)
a
FITTINGS VALVES
NOMINAL OR
STANDARD Standard EII 90-degree Tee Coupling
SIZE (inches) Ball Gate Butterfly Check
90 Degree 45 Degree Side Branch Straight Run
3 / 8 0.5 — 1.5 — — — — — 1.5
1 / 2 1 0 . 5 2 — — — — — 2
5 / 8 1 . 5 0 . 5 2 — — — — — 2 . 5
3 / 4 2 0 . 5 3 — — — — — 3
1 2.5 1 4.5 — — 0.5 — — 4.5
1
1 / 4 3 1 5.5 0.5 0.5 0.5 — — 5.5
1
1 / 2 4 1.5 7 0.5 0.5 0.5 — — 6.5
2 5.5 2 9 0.5 0.5 0.5 0.5 7.5 9
2 / 2 7 2.5 12 0.5 0.5 — 1 10 11.5
1
3 9 3 . 5 1 5 1 1 — 1 . 5 1 5 . 5 1 4 . 5
3 / 2 9 3 . 5 1 4 1 1 — 2 — 1 2 . 5
1
4 12.5 5 21 1 1 — 2 16 18.5
5 16 6 27 1.5 1.5 — 3 11.5 23.5
6 19 7 34 2 2 — 3.5 13.5 26.5
8 2 9 1 1 5 0 3 3 — 5 1 2 . 5 3 9
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 degree = 0.01745 rad.
a. Allowances are for streamlined soldered fittings and recessed threaded fittings. For threaded fittings, double the allowances shown in the table. The equivalent
lengths presented in the table are based on a C factor of 150 in the Hazen-Williams friction loss formula. The lengths shown are rounded to the nearest half-
foot.

2018 INTERNATIONAL RESIDENTIAL CODE ® 911
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