Secondhand boilers and secondhand pressure vessels, originally installed in Wisconsin and not constructed and stamped according to some edition of the ASME code, may be reinstalled if the maximum allowable working pressure is recalculated with a factor of safety of 6.
The pressure calculation formula for shells is as follows:
Microsoft Windows NT 6.1.7601 Service Pack 1
P
= (T.S. x t x E)/(R x F.S.)
Microsoft Windows NT 6.1.7601 Service Pack 1
where P = maximum allowable working pressure, pounds per square inch
Microsoft Windows NT 6.1.7601 Service Pack 1
T.S.
= tensile strength of shell plate, pounds per square inch
Microsoft Windows NT 6.1.7601 Service Pack 1
t
= minimum thickness of shell plates, inches
Microsoft Windows NT 6.1.7601 Service Pack 1
E
= efficiency of longitudinal joint
Microsoft Windows NT 6.1.7601 Service Pack 1
R
= inside radius of the outside course of the shell, inches
Microsoft Windows NT 6.1.7601 Service Pack 1
F.S.
= factor of safety
Microsoft Windows NT 6.1.7601 Service Pack 1
Note:
The pressure calculation formula for flat heads and flat surfaces is as follows:
Microsoft Windows NT 6.1.7601 Service Pack 1
P
= (T.S. x t
2
)/(0.5 x d
2
x F.S.)
Microsoft Windows NT 6.1.7601 Service Pack 1
where P = maximum allowable working pressure, pounds per square inch
Microsoft Windows NT 6.1.7601 Service Pack 1
T.S.
= tensile strength of shell plate, pounds per square inch
Microsoft Windows NT 6.1.7601 Service Pack 1
t
= thickness of plate, inches
Microsoft Windows NT 6.1.7601 Service Pack 1
d
= diameter of head or shortest unsupported span of head or maximum
pitch between stays, inches
Microsoft Windows NT 6.1.7601 Service Pack 1
F.S.
= factor of safety
Microsoft Windows NT 6.1.7601 Service Pack 1
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