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WATER CALCULATION WORKSHEET FOR ?J O f~/ ~. ~~ /~•
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INFORMATION REQUIRED TO CALCULATE WATE~t SERVICE SIZE
1. Demani! of building (n gallons per minute. WSFU's •D = (GPM) •'
2. Difference in elevation from main or extemal pressure tank to building control valve. (feet),~_
3. Size of the water meter. (When appl(cable) 5/8" _, 3!4"~, t" _, 1-112" _, 2' _, 3` _, 4' -,_,, 6" __._
4. Developed length from main or extemal pressure tank to building control valve. (feet) _ ~O
3. Low pressure at main In street or extemal pressure tank.
(PsiA
CALCULATE WATER SERVICE PRESSURE LOSS
., ..
6. low pressure at main in street or external pressure tank. (value of # 5 above) ~~
7. Water service diameter is ~. Material is ~X, y .Pressure loss
per ~001t ^ _ ~o psi. X (dec,msl eQuiValen of service length, i.e.; 65R = .85) o
(Subtract Tine 7. from I1ne 6.) subtotal ~~,~,Z
8. Determine pressure gain or loss due to elevation,
(multiply the value of # 2 above by .434) value o! "8"
9. Available pressure after the bldg; control valve. (Subtract or add line 8. Enter In "B'.) subtotal .S~• ~
CALCULATE THE PRESSURE AVAILABLE FOR UNIFORM LOSS (VALUE OF'~a'~)
B. Available pressure pftsr the bldg. control valve. (from `9" above) Value of "B",~
C. Pressure loss of water meter (when meter is required or installed) Value of "C" _~
(Subtract line C. from line B.) subtotal . ~2
D. Pressure at controlling fixture, ~ Value of "D"
(Controlling ftxture is ~• ~ F'
(Subtract the value of 0.) subtotal . ~
E. Difference in elevation between the quilding control valve •
and the controlling fixture in feet _,~[~_ X .434 psUft. Value of 'E' ~,~-
(Subtract the value of E.) subtotal _~ y-9
F• Pressure loss due to water treatment devices, instantaneous
water heaters and backflow preventera which serve the
controlling fixture. '
(Pressure loss due to Value of "F" ,~~~
(SUbUBCt the v81ue of F.) subtotal ~q
G• developed length from bulldinp control valve to convollinq
ftxture in feet ~,{~~ X t,5
Value of "G" ~~
(Water distribution piping material is ~~ fJ,~ lwde by the value of G.) subtotal _ . ~ 7 G
Multiply by _ X00
A• Pressure available for uniform loss
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