Sizing Guide

Guidelines for Sizing

What would be required to handle the drainage
from a 4 bathroom home, also including a dishwasher, a washer,
a laundry tray, a kitchen sink, water softener, basement shower,
a13,000gallonpool,andabarsink(1-1/2"trap)?
1. From Figure 1:



Four bathroom groups 24
Water softener 4
Dishwasher 2
Washing machine 2
Laundrytray 2
Kitchen sink with disposal 3
Basement shower 2
Swimming pool 13
Barsink(unlisted1-1/2") 3
 55
 2. RefertoFigure2:
Find 55 Fixture Units on the horizontal axis. Follow vertically
until intersecting the line then horizontally to the left. The
 on the vertical axis is 30 gpm.
Determine the   of the installation illustrated in
Figure 3, the Typical Installation Illustration:
 1. ThatStaticHeadinthisinstanceis7'.
 2. FrictionHead:
a. Since the required   in this illustration of
30 gpm is less than the 46 gpm necessary to carry solids
through3"pipe,2"or2-1/2"pipeshouldbeused.If3"
pipe is preferred or required, a  of at least
46 gpm is required.
b. Measurement of the length of the discharge pipe
totals200'.
 c.RefertoFigure6andnotethefrictionfactorinequivalent
feet for each fitting:
   3-90°elbows,2" 16-equivalentfeet
   1-gatevalve,2" 1-equivalentfoot
   1-swingcheckvalve,2" 17-equivalentfeet
 34 - equivalent feet
  Adding34'tothemeasuredpipelength,thetotaleffective
pipelengthbecomes234'or2.34100'increments.
 d.RefertoFigure4,findthe30gpmrequired
on the left scale and follow over to the 2" PVC pipe size
column.FrictionHeadis1.8x2.34=4.2'.
 3. TotalHeadRequired:
  TotalHead=StaticHead+FrictionHead
Example:
   TotalHead=7+4.2
   TotalHead=11.2
Due to the existence of water closets in this installation, a
pumpwith2" capacity should be used unless
otherwise specifically stated by applicable codes. Use Figure
7 to select pump.
To determine the Basin size, find the  (30 gpm)
in the column on the left of Figure 6. Any Basindiameterof18"
or greater is acceptable.
Since this application is domestic, a  is sufficient.
SRecommendedselectionsforthisinstallationwould
be a utilizingan18"orgreaterdiameterBasin
anda2" pump capable of delivering at least
30gpmat11'.
6