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INFORMA l1ON REQUIRED TO CALCULATE WATER SERVICE SIZE
,. Demand 01 building In gallonS per minute.
2.
3.
4.
5.
WSFU'$ II(. S- = (GPM) /0.7
Difference in elevation from main or external pressure tank to building control valve. (feet) -
Size of 1he water meter. (When applicable) 518"_314" X," _.1-1/2" -Z' _.3" ~4" -6"-'
Developed length Irom maio or external pressure tank to building COI1IIQI valve. (feel) LL
Low prt1SS1118 at main in street or extemal pressure lank. (pSig) :5' 3#-
CALCULATE W A TEA SERVICE PRESSURE LOSS
6.
Low pressure at main In SII'88I or external pre$SUI& tank. (vatue of , 5 aboY8)
7.
Waterservicediameteris_.Materialis . Pressurelo$$
per 100 II = _Ibs. X _(deoimBI equivalent 01 service length, Le.; 65ft '" .65)
(Subtrac:t line 7. Irom line 6.)
sub_I
8.
Determine pressure 981n or loss due to elevation,
(multiply 1he value of # 2 above by .434)
Available pressure aller the bldg. control valve. (SuÞtraCI or add line 8. Enl8r in "8".)
sublotlll
value 01"8"
9.
CALCULA TETHE PRESSURE AVAILABLE FOR UNIFORM LO$$(V ALUE OF U À ")
~
B.
C.
Available pressure afterthe bldg. controlvalve. (from "9" above)
Pressure 10$$ 01 water moIer (when møter is required or Installed)
Value of "8"
Value of"C"
53
~¥O
5/.60
-1L.
3&."0
(sub1r8Clllne C. from ftna.8.)
subtotøt
D.
Pressure at controlling fildure.
(controUingflXlUreÎS 5"'r-/¿ t.~ e/H..-r
Value 01 "D"
I
(subtraCt the value of D.) $IIbtøI8I
E.
Difference in etevation bØIWII8I11he by¡png control valve
and1hecontroUlngfi \Ú /"8lnfeet~X .434psillt. Valueof"c 3 LJ7
(SUÞlract the value 01 E.) subtOt8I ~
F.
Pressure IOS$ dUe to water treatment deVices, instantaneous
water hea1er8 and baCkflow preventers which serve the ~
~=to ø I VaJue 01 "P
I' (Subtrac:tfhllvalueolF.) subtDlBl "i3:rs
G.
Deve\opj d 1eng1h from building control va/veto controlling L
lixlureinfeet~X1.s Va/ueol"G" ~
(Divide by \he value of G.) subtotel' , S'~ ~ø-.
(Waler álStribulion piping material is 1./1-.....frke- 10 ~ " )
"
/
A.
Pressure availalile lor uniform 10$$
,...,ft¿ ~
t" .7.S" &,.0
,,~" 's..O I~. S-
," 3r:tJ ¡If. S'"
Multiply by ---1JJJL
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