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Is an internal tank lining required for coco methyl ester or CME? Is there any standard that specifies this requirement?

Can ASTM SA178 tubes be used interchangeably with ASTM SA192 tubes?

We have an exchanger that we will install an additional drain nozzle. According to construction drawing, all welds must be PWHT'd. There is a required reinforcement pad on this nozzle. What is the accepted PWHT sequence? PWHT first the nozzle weld to the shell then PWHT again after welding the...

We have a thinned down pressure vessel and as an immediate repair, we have installed a patch plate on the thinned down portion. Does ASME allow this repair method for a long term? Or shall I recommend sectional replacement? Where in the ASME code is this topic discussed? By the way, the...

What is the industry-accepted NDT for a finished strength welded tube to tubesheet weld joint?

What is a certificate of non-radiative contamination? Is this normally required to be submitted by a manufacturer to a client?

What is the recommended temperature of a material before a standard Brinell hardness test is performed? Ambient?

We have a 42 mm thick tubesheet which was a part of a fixed tubesheet type heat exchanger. Due to shell cracking failure, the shell to the tubesheet welds failed by transverse cracks. We completely cut open the shell for us to replace it at the same time, we desire to recover the tube bundle...

Are vent holes in patch plates needed when welding patch plates to areas with holed through portions? We usually do it as practice to provide vent holes in patch plates to have a way for trapped air to escape while welding the patch plates.We have experienced difficulty in closing the weld as...

Can somebody help me in calculating the weld strength of a 20" SCH 80 pipe connected perpendicular to a 42" diameter, 9 mm thick (not seamless) pipe, SS304 material. It has a reinforcing pad of CS material of 9 mm thickness.The 42" diameter run is installed vertically and is...