Radioscopic dating

Such welds must conform to the requirements of Chapter VIII. for carbon steel: (i)All butt welds of tubes shall be tested as required hereunder:- (i) Components greater than 178 mm (7 inch) bore.- All Welds shall be non-destructively tested by radiographic or other approved methods.

Arc Welded butt joints shall be made by the metallic shielded arc process and post weld heat treated effectively except in the following cases : for alloy steel: (i) In case of 0.5 Molybdenum Steel if thickness does not exceed 13 mm and outside diameter does not exceed 127 mm. (ii) Tubes greater than 102 mm (4 inch) bore and upto and including 178 mm (7 inch) bore.- 10 per cent of the welds by each welder, selected at random with a minimum of 2 welds per welder, shall be subjected to non-destructive examination by radiographic or other approved method.

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Tubes having an external diameter not exceeding 5 inches may be jointed and such joints may be flash welded, machine forge welded, arc or gas welded.

Tubes above 5” diameter may also be welded provided they are located outside the furnace.

(5) Alternatively, 5 per cent of the welds made by each welder selected at random, with a minimum of one weld per welder, shall be subjected to non-destructive examination by radiographic or other approved method.

This rate may be reduced to 2 per cent by arrangement with the Inspecting Authority after initial satisfactory results have been produced.

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