MIL-HDBK-1003/6
EQUATION:
VT = V1 + V2 + V3
(1)
where:
VT = Total expansion vessel volume
V1 = Volume required for pressurization
V2 = Volume required for expansion and contraction
V3 = Volume required for sludge space, pump suction coverage,
and reserve capacity
4.9.3.1
Volume Required for Pressurization
EQUATION:
V1 = 0.2(V2 + V3)
(2)
where:
V1 = Volume required for pressurization
V2 = Volume required for expansion and contraction
V3 = Volume of sludge space based on 6 inch (15.24 cm) of depth
plus the greater of the following two volumes: a) The volume of water
sufficient to cover the top of the pump intake line in the expansion vessel by
6 inches or b) the volume needed to provide a 30 second supply of water based
on combined pump capacity.
These two equations
4.9.3.2
Volume Required for Expansion and Contraction.
show the development of this volume calculation.
EQUATION:
V2 = Max Supply Water Expansion + Max Return Water Expansion
(3)
+Q
S,
+Q
S,
LWmaxst - LWminst
LWmaxrt -
LWminrt *
*
*
*
S)))))))))))))))))Q *
*
*S))))))))))))))))))))Q*
+
(4)
EQUATION:
V2 =
SDmaxst
S min
S
S
Dminrt *
*
*
* Dmaxrt
D
st
.Q
S-
.Q
S-
where:
LWmaxst = Lb of water at maximum supply temperature
LWminst = Lb of water at minimum supply temperature
SDmaxst = Specific Density at maximum supply temperature
SDminst = Specific Density at minimum supply temperature
LWmaxrt = Lb of water at maximum return temperature
LWminrt = Lb of water at minimum return temperature
SDmaxrt = Specific Density at maximum return temperature
SDminrt = Specific Density at minimum return temperature
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