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WATER CALCULATION WORKSHEET FOR
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NAME OF PROJECT
INFORMATION REQUIRED TO CALCULATE WATER SERVICE SIZE
1.
I
I
:sy
2.
= (GPM) ::JI, ~
Difference in elevation from main or external pressure tank to building control yalve, (feet) S-(~
Size of water m~ter (when meter is required) 5/8"~, 3/4'~, 1" _' 1-1/2" ~, 2" _' larger size ...-
Developed length from main or external pressure tank to building control valvef (feet) ;l7.)
I
I (psi) ,S'" r
Demand of building in building in gallons per minute.
WSFU's
3.
4.
5.
low pressure at main in street or external pressure tank.
CALCULATE WATER SERVICE PRESSURE LOSS
6.
Sf{
S:S-
i/fi,S
';)t/7
'16 .3
low pressure at main in street or external pressure tank. (value of # 5 above)
, . ' I
Determine pressure loss due to friction in J~ inch diameter j
water service. Subtract value of "7"
(Water service piping material is c:.~ ~ !
subtotal
I
Determine pressure loss due to elevation, I ,
(multiply the value of # 2 acove by .434)' sUbtract value of "8"
9. Available pressure after the bldg. control valve. (enter in "B" below) subtptal
CALCULATlO THE PRESSURE AVAILABLE FOR UNIFORM LOSS (VALUE OF "A"j
'j Valueof"B" ~.3
Sub. ract value of "C"
I'
subtbtal 'i (... '\
sUblract value of "DnZ~
I
sUbtbtal ~, ' .3
I
Subtract value of "E" -d-
sUbtbtal "';2, s; "I
I
I
i
7.
8.
B.
Available pressure after the bldg. control valve. (from "g" above)
C.
Pressure loss of water meter (when meter is required)
D.
Pressure at controlling ~.,~.re,^ ~ t! .....e I
(Controlling flXlure is ----1--.tf ~ ..... U ~ V Ot Iv il' )
E.
Difference in elevation betvtleen the building control valve
and the controlling fixture in feet ~"I" X .434 psi/ft.
F.
Pressure loss due to water treatrnent devices, instantaneous
water heaters and backflow preventers which serve the
controlling fixture.
(Pressure loss due to ..."..'11.1:....)""."",."..."', ,'",,",k_'__. -,,'...
i
subtotal
i
I
I
Divide by value of "G"
I '
subtotal
!
MUltiPlY by
"A" 1=
,/, ~,
i
Subtract value of "F"
i
;;1), tf
---
G.
. Developed length ~r91P building control valve to controlling
fixture in feet 15'C/ X 1.5
-) .., "'-
w.'1t~,';. i:;)
.. ~.
(Water distribution piping material is C Off ,12'
100
A.
Pressure available for uniform loss
SBD -&479 (R11198)