B31.3 Fabrication, Assembly And Erection Flashcards
The zone for preheat shall extend
At least 1 inch beyond each edge of the weld
When fitting up a socket weld joint the male end is welded in the female socket with
An approx 1/16” gap at the base of the joint
Where a hardness limit is specified in table 33 1.1.1 at least ________% of welds, hot bends, and hot formed components in each furnace heat treated batch and 100% of those locally heat-treated shall be tested
10
What is acceptable as an alternate heat treatment
Normalizing, normalizing and tempering, or annealing
When an entire piping assemble is to be heat treated cannot fit into the furnace, it is permissible to heat treat in more than one heat treat, provided there is at least _______ overlap between successive heats, and that the parts of the assembly outside the furnace are protected from harmful temp gradients
1 foot
Flattening of a bend, the difference between maximum and minimum diameter’s at any cross-section, shall not exceed _______% on nominal outside diameter for internal pressure
8
Flattening of a Bend, the difference between maximum and minimum diameter’s at any cross-section, shall not exceed ________% on nominal outside diameter for external pressure
3
Flanged joints: Before bolting, mating gaskets contact surfaces should be within ________ in/ft, measured across any Dia.
1/16
Flange Bolt holes should be aligned within ______ max offset
1/8 in.
Bolts should extend completely through their nuts. Any which failed to do so or considered acceptably engaged if the lack of complete engagement is not more then
One thread
How many gaskets shall be used between Contacts faces in the Assembling a flanged joint
No more than one gasket
What is the minimum time that a leak tests must be maintained
10 minutes
