Section 408.4263. Threaded connections.

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Pipe connections, if threaded, shall be tapped into material having a minimum thickness as specified in table HG-370, except that when a curved surface is to be tapped the minimum thickness shall be sufficient to permit at least 4 full threads to be engaged.

TABLE HG-370

MINIMUM THICKNESS OF MATERIAL FOR THREADED CONNECTIONS TO BOILERS

Size of Pipe Connection, Minimum Thickness of Material Inches      Required, Inches Under 3/4                                                  1/4 3/4 to 1, inclusive

5/16 1 1/4 to 2 1/2,   inclusive 7/16 3 to 3 1/2,

inclusive                            5/8 4 to 5, inclusive

7/8 6 to 8, inclusive

1 9 to 12, inclusive                              1 1/4

History: 1954 ACS 49, Eff. Feb. 14, 1967; 1979 AC.

                    
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