connection elevations, and numbers in

b. Solution.

For latrine #1 there

brackets [ ] are main elevations.

are

17

outlets

and

8

showers.

Referring to figure 13, enter the left

column at 17 outlets.

Connect this

point to the point on the right column

From paragraph 14, wherever the line

corresponding to eight shower heads.

is more than 231 feet below the

These two points are shown connected

storage tank, the pressure will exceed

on the figure, with the connecting

100 psi. For the system in figure 16,

line intersecting the center column at

the tank elevation is 200 feet while

a peak demand of 25 gpm (gallons per

the lowest point in the system is the

minute).

The

peak

demands

for

service connection for No. 2 laundry

buildings one and two are shown below:

at 110 feet.

Therefore, the maximum

elevation difference is 90 feet, so

#1 Latrine

25 gpm

the static pressure in the line will

not exceed the safe working pressure.

#2 Laundry

75 gpm

The

peak

flow

in

the

lines

is

determined next. The line from A to B

a. Requirement.

With the numbers

(main AB) must be able to carry the

of outlets and showers shown below,

peak demand for both buildings. Hence

determine the peak demand for each

the peak flow in line AB is the total

building and the peak flow in the

peak demand for the buildings, or 100

lines.

gpm. The peak flows in the lines are

then as follows:

Main AB:

100 gpm

Branch B1:

25 gpm

Branch B2:

75 gpm