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// CODE SNIPPET

A 104.0 Permissible Friction Loss

Uniform Plumbing Code 2018 of Nevada > A Recommended Rules for Sizing the Water Supply System > A 104.0 Permissible Friction Loss
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A 104.1 Residual Pressure

Decide what is the desirable minimum residual pressure that shall be maintained at the highest fixture in the supply system. Where the highest group of fixtures contains flushometer valves, the residual pressure for the group shall be not less than 15 pounds-force per square inch (psi) (103 kPa). For flush tank supplies, the available residual pressure shall be not less than 8 psi (55 kPa).

A 104.2 Elevation

Determine the elevation of the highest fixture or group of fixtures above the water (street) main. Multiply this difference in elevation by 0.43. The result is the loss of static pressure in psi (kPa).

A 104.3 Available Pressure

Subtract the sum of loss in static pressure and the residual pressure to be maintained at the highest fixture from the average minimum daily service pressure. The result will be the pressure available for friction loss in the supply pipes, where no water meter is used. Where a meter is to be installed, the friction loss in the meter for the estimated maximum demand should also be subtracted from the service pressure to determine the pressure loss available for friction loss in the supply pipes.

A 104.4 Developed Length

Determine the developed length of pipe from the water (street) main to the highest fixture. Where close estimates are desired, compute with the aid of Table A 104.4(1), Table A 104.4(2), or Table A 104.4(3), whichever is applicable, the equivalent length of pipe for fittings in the line from the water (street) main to the highest fixture and add the sum to the developed length. The pressure available for friction loss in psi (kPa), divided by the developed lengths of pipe from the water (street) main to the highest fixture, times 100, will be the average permissible friction loss per 100 feet (30 480 mm) length of pipe.
TABLE A 104.4(1)
ALLOWANCE IN EQUIVALENT LENGTH OF PIPE FOR FRICTION LOSS IN VALVES AND THREADED FITTINGS*
EQUIVALENT LENGTH OF PIPE FOR VARIOUS FITTINGS
DIAMETER OF FITTING
(inches)
90° STANDARD ELBOW
(feet)
45° STANDARD ELBOW
(feet)
90° STANDARD TEE
(feet)
COUPLING OR STRAIGHT RUN OF TEE
(feet)
GATE VALVE
(feet)
GLOBE VALVE
(feet)
ANGLE VALVE
(feet)
3/8 1.0 0.6 1.5 0.3 0.2 8 4
1/2 2.0 1.2 3.0 0.6 0.4 15 8
3/4 2.5 1.5 4.0 0.8 0.5 20 12
1 3.0 1.8 5.0 0.9 0.6 25 15
11/4 4.0 2.4 6.0 1.2 0.8 35 18
11/2 5.0 3.0 7.0 1.5 1.0 45 22
2 7.0 4.0 10.0 2.0 1.3 55 28
21/2 8.0 5.0 12.0 2.5 1.6 65 34
3 10.0 6.0 15.0 3.0 2.0 80 40
4 14.0 8.0 21.0 4.0 2.7 125 55
5 17.0 10.0 25.0 5.0 3.3 140 70
6 20.0 12.0 30.0 6.0 4.0 165 80
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm, 1 degree = 0.017 rad
* Allowances are based on nonrecessed threaded fittings. Use one-half the allowances for recessed threaded fittings or streamlined solder fittings.
TABLE A 104.4(2)
EQUIVALENT LENGTH OF COPPER TUBE SIZE CPVC PIPE FOR VARIOUS FITTINGS
DIAMETER OF FITTING
(inches)
90 DEGREE ELBOW
(feet)
45 DEGREE ELBOW
(feet)
COUPLING OR STRAIGHT RUN OF TEE
(feet)
90 DEGREE STANDARD TEE
(feet)
1/2 1.6 0.8 1.0 3.1
3/4 2.1 1.1 1.4 4.1
1 2.6 1.4 1.7 5.3
11/4 3.5 1.8 2.3 6.9
11/2 4.0 2.1 2.7 8.1
2 5.2 2.8 3.5 10.3
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm
TABLE A 104.4(3)
EQUIVALENT LENGTH OF SCHEDULE 40 AND 80 CPVC PIPE FOR VARIOUS FITTINGS
DIAMETER OF FITTING
(inches)
90 DEGREE ELBOW
(feet)
45 DEGREE ELBOW
(feet)
COUPLING OR STRAIGHT RUN OF TEE
(feet)
90 DEGREE STANDARD TEE
(feet)
1/2 1.5 0.8 1.0 4.0
3/4 2.0 1.1 1.4 5.0
1 2.5 1.4 1.7 6.0
11/4 3.8 1.8 2.3 7.0
11/2 4.0 2.1 2.7 8.0
2 5.7 2.6 4.3 12.0
For SI units: 1 inch = 25 mm, 1 foot = 304.8 mm

Related Code Sections


A 104.0 Recommended Rules for Sizing the Water Supply System, Permissible Friction Loss
, will be the average permissible friction loss per 100 feet (30 480 mm) length of pipe. TABLE A 104.4(1) ALLOWANCE IN EQUIVALENT LENGTH OF PIPE FOR FRICTION LOSS IN ...
Uniform Plumbing Code 2018 of Nevada > A Recommended Rules for Sizing the Water Supply System > A 104.0 Permissible Friction Loss
A 106.2 Recommended Rules for Sizing the Water Supply System, Branches
Where fixture branches to the building supply are sized for the same permissible friction loss per 100 feet (30 480 mm) of pipe as the branches ...
Uniform Plumbing Code 2018 of Nevada > A Recommended Rules for Sizing the Water Supply System > A 106.0 Size of Principal Branches and Risers > A 106.2 Branches
A 107.2 Recommended Rules for Sizing the Water Supply System, Pressure-Reducing Valves
Where a pressure-reducing valve is used in the building supply, the developed length of supply piping and the permissible friction loss shall ...
Uniform Plumbing Code 2018 of Nevada > A Recommended Rules for Sizing the Water Supply System > A 107.0 General > A 107.2 Pressure-Reducing Valves
A 106.1 Recommended Rules for Sizing the Water Supply System, Size
on each branch or riser and using the permissible friction loss computed in Section A 104.0 ...
Uniform Plumbing Code 2018 of Nevada > A Recommended Rules for Sizing the Water Supply System > A 106.0 Size of Principal Branches and Risers > A 106.1 Size
A 107.0 Recommended Rules for Sizing the Water Supply System, General
, the developed length of supply piping and the permissible friction loss shall be computed from the building side of the valve ...
Uniform Plumbing Code 2018 of Nevada > A Recommended Rules for Sizing the Water Supply System > A 107.0 General
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