solda de tubulações de paredes diferentes

8/18/2019 Solda de Tubulações de Paredes Diferentes

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EXPLORE the WORLD of PIPINGDOCS MATL SOCY PIPES FLANGES FTTG VALVES BOLTS GASKETS EQPT SPECIALS STEEL DIN STEAM OTHERS

Weld End Preparation at Unequal Wall Thicknee

!ccepta"le Dei#n in Pipin# co$ponent

n most piping systems there are components such as valves, castings, heavier header sections, and

equipment nozzles which are welded to the pipe.

In such instances the heavier sections are machined to match the lighter pipe wall and the excess

thickness tapered both internally and externally to form a transition zone.

Limits imposed by the various codes for this transition zone are fairly uniform.

The external surface of the heavier component is tapered at an angle of 3! maximum for a minimum

ength equal to "."#$ times the pipe minimum wall thic%ness and then at &'! for a minimum of "."#$

times the pipe minimum wall.

nternally, either a straight bore followed by a 3! slope or a taper bore at a maximum slope of " to &

for a minimum distance of $ times the pipe minimum wall are required.

The surface of the weld can also be tapered to accommodate differing thic%ness. This taper should not

exceed 3!. It may be necessary to deposit weld metal to assure that these limits are not violated.

(elow some tables with acceptable design for unequal wall thic%nesses acc to )*+ (3".-

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NOTE

%&' o minimum when materials 4oined have equal specified minimum yield strengths.

5 6erner *7l%en $- 8 $"'. )ll rights reserved.

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