UW-2 a (3) 2

[rogervm]

The UW-2a(3), explain how to do when a heat exchanger is designed for a lethal service but just in one side.

It says that when only one side of the heat exchanger contains a lethal substance, the other side need not to be built to the rules for a vessels in lethal service if:

a) Exchanger tubes are seamless; or

b) Exchanger tubes conform to a tube specification permitted by this Division, are butt welded without addition of filler metal, and receive in liue of full radiography all off the following nondestructive testing and examination:

............

When (b) says "butt welded", Does that mean the longitudinal weld or any welds (ex.: transversal)?

Thanks. Roger

 

[metengr]

) Exchanger tubes conform to a tube specification permitted by this Division, are butt welded without addition of filler metal,...

The above refers to long seam welded tubing.

 

[deanc]

http://www.olinbrass.com/fineweld_tube_manu.htm

One of many....works pretty good.

ERW pipe works much the same.