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

41

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