Sec. 14-9.32. Boiler bushing, flange, for feed pipe connections

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(a) Figure P-42 illustrates a typical form of flange for use on boiler shells for passing through piping such as feed, surface blowoff connections, etc., and which permits of the pipes being screwed in solid from both sides in addition to the reinforcing of the opening in the shell. The pipes shall be attached as provided in section 14-9.23 of this Subpart.
(b) In these and other types of boilers where both internal and external pipes making a continuous passage are employed, the boiler bushing or its equivalent shall be used.

                    
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