In my experience and engineering common sense the best practice in gas process plants will be to use welded joint instead of threaded one. However there is still companies fabricating / constructing using threaded joint and even using FITTING UNIONS . Recently it was known of a small fire...
What are the considerations that justified the use of CATHODIC PROTECTION and /or external paint on a DUPLEX buried gas pipeline? Can I get some hint on that?... Also if this is totally necessary, what if the efficiency of the paint system needed and how much costly is it compare to a C/S pipe...
Is there any way to manage the following conditions with C/S ? . Please advice.. If not, could C/S+clad 3.2 mm be a reasonable and realistic option. Can INCO ALLOY SUCH AS GRADE 625 be a good option?. Is there any manufacturer that can do the piping and vessels material?
Thanks in advance...
Is there any way to manage the following conditions with C/S ? . Please advice.. If not, could C/S+clad 3.2 mm be a reasonable and realistic option. Can INCO ALLOY SUCH AS GRADE 625 be a good option?. Is there any manufacturer that can do the piping and vessels material?
Thanks in advance...
We have a proposal for the contractor to have a joint of 1.25Cr-1/2 Mo, line to vessel in reformed gas with hydrogen service, that showed a defect in Rx after PWHT to be repair with Inconel 82 and avoid a new PWHT.
After removing the transverse crack the dig area is 1x3/4 " with depth of 9 mm...
I am looking for reference microstructure that relates hydrogen attack or embrittlment in ER-80S B2 filler metal that was TIG weld to a fillet weld between AISI 4140 bar and 1.25Cr-.5 Mo plate . This material was HT and the final Hardness was less than 200 BH.... Now a fail sample is showing 45...
