Sec. 4-13.2. Boiler openings

Latest version.

(a) Openings required.

Boiler openings must meet the requirements of section IV of the ASME Code.

(b) Threaded openings.

All threaded openings in a boiler shall be tapped into material having a minimum thickness as specified for the various standard pipe sizes in the following table:

MINIMUM THICKNESS OF MATERIAL FOR TAPPINGS


Pipe size	Minimum thickness of material or length of thread required
(inches)	(inches)
1 and under	¼
1¼ to 2, inclusive	/₁₆
2½	/₁₆
3 to 3½, inclusive	⅝
4 to 5, inclusive	⅞
6 to 8, inclusive	1
9 to 12, inclusive	1¼

                    
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