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Reg. 427, Reg. 428, Reg. 429, Reg. 430
TESTS FOR CLASS II FUSION WELDED SEAMS
Manholes and other openings in Shells
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Manholes and other openings in boiler shells shall
be placed away from any welded seam. Oval openings shall
be arranged with their minor axis parallel to the longitudinal
centre line of the boiler.
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Reg. 428
TESTS FOR CLASS II FUSION WELDED SEAMS
Dished End Plates with pressure on Concave side
Reg. 429
TESTS FOR CLASS II FUSION WELDED SEAMS
Unstayed Flat End Plates
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The working pressure of unstayed flat end plates shall
comply with Regulation
412.
Where the diameter of the openings in an unstayed flat
end plate is greater than 2½ inches or the pitch
in inches is less than four times the diameter of the
holes full compensation shall be provided as in Regulation
279.
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Reg. 430
TESTS FOR CLASS II FUSION WELDED SEAMS
Thickness of Angle Rings
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Thickness of angle rings shall comply with Regulation
379(a).
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