API 510 says that widely scattered pitting can be ignored provided that the
remaining thickness is not less than 1/2 the minimum required thickness
Rupture disks are commonly used
to protect a pressure relief valve from corrosive products
During a vessel repair or alteration, when can controlled deposition welding be used as an alternative for pwht?
for P1, P3, and P4 materials
Erosion or corrosion in an exchanger shell that is adjacent to the bundle baffles can be most easily found during an internal inspection with
flashlight beam directed parallel to the shells internal surface
An exchanger shell has a locally corroded area. The owner decides to repair this area with weld buildup. During this repair, the shell should be
checked for distortion
When weld build up is performed in a corroded area, the
area should be examined with MT or PT prior to welding
Which welding process requires the uses a non-combustable electrode
During an inspection, a few isolated deep pits are found in the vessel wall. The current vessel wall thickness is a 0.800". The minimum required shell thickness is 0.600". What is the maximum pit depth allowed?
The 3G welding position is an
vertical groove welder qualification test weld
What is the most extensively used NDE method for welds
A corroded are in a carbon steel vessel is being repaired by using weld overlay(weld build up). The vessel surface should be examined by
MT or PT both before and after welding
A vessel has a shell that was designed using a joint efficiency of 0.85. There is a corroded area in the vessel that needs evaluated. When calculating the minimum required thickness for this corroded area, what joint efficiency should be used?
May use an "E" of 1.0 if the corroded area is away from a weld
Which of the following is not a requirement for when installing a flush patch on a vessel shell?
C) The patch must have a tell-tale hole
A corroded spring in a relief valve will
pop at a pressure lower than the set pressure
In welding, what is the A number
Chemical analysis of the deposited weld metal
A welded repair is made to stainless steel cladding. The vessels base metal is carbon steel. The completed weld repair should be examined using
Areas directly above or below the liquid level in vessels containing acidic corrodents are subject to
The structure of weld metal is most similar to that formed by
How many shell welds are required to be radiographed per API 577