Amtrol WELL-X-TROL WX-401 - Manual (Page 5)

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Step Three: Calculate Acceptance
Factor (AF)
Remember our formula for calculating the
acceptance factor (AF) for diaphragm tanks?
Step Four: Maximum Acceptance Factor
Verification
After calculating the acceptance factor (AF),
we must compare the value to the maximum
acceptance factors shown in Table 1. In the
case of our example, an AF of 0.518 is less than
the maximum acceptance factor of all WX-420 +
WX-450 series models. Therefore, either series can
be used.
Step Five: Calculate Minimum Total
Volume (T
v
) of Full Acceptance
Well-X-Trol
®
Remember the formula:
Step Six: Select Well-X-Trol ® Model that
is Equal to or Greater Than “T
v
”.
If ASME construction is not required, select from
420 series, Table 1.
This example would be a WX-425.
To Recap:
We went through six steps to size a full acceptance
Well-X-Trol ® to gain maximum acceptance:
Step One Determine pre-charge pressure
(P
1
); pump cut-in pressure (P
2
) and
pump cut-out pressure (P
3
) from
pump curve of pump selected for
system.
Step Two Determine ESP Volume (Average
GPM x run time) From pump
curve:
Step Three Determine AF:
Step Four Verify the calculated AF is less
than or equal to the maximum
acceptance factor for the Well-X-
Trol ® required.
Step Five Calculate total Well-X-Trol ®
Volume:
Step Six Select series 420 or 450 Well-X-
Trol ® Model
30 + 14.7
78 + 14.7
AF = 1 -
AF = .518
196
.518
T
V
=
ESP Volume
AF
T
V
=
= 378 gallons
P
2
+ 14.7
P
3
+ 14.7
1 -
ESP Volume
AF
T
V
-