Cladding Valve

[Weko]

Dear All,

I am facing an upstream oil&gas processing facilites project which the client tries to reduce a lot of cost. One of the is "cladding valve".

They specify cladding valves such as:
- Body Carbon steel with Incoloy/inconel cladded, for gate/globe/check/ball type valves
- The ball of ball valves also are cladded, CS ball with SS316 cladding, CS ball with incoloy/inconel cladded.

Kindly give me some advice for which valve manufacturer has a reliable experience list for the above type valve.

Is there any special concern I must aware of for cladded valve constuction?

 

[OGMetEngr]

Do your due diligence in specifying a steel and/or welding process which results in acceptable hardness values for sour service. This is especially critical as, since 2003, NACE MR0175 / ISO15156 has required weld qualifications to use the Vickers micro-hardness method. This method will show higher (hence - unacceptable) hardness values than the old method of hardness testing to Rockwell C (HRC). Alternatively, if you keep design stress below 2/3 SMYS and follow with a PWHT, MR0175 / 15156 allows the HRC method to be used (still a good idea to get customer approval for this method anyway).

 

[gerhardl]

OGMetEngr is right. Generally I would add that you should focus on the exact demands, procedures and tests that the end user require. The producer, if not experienced or with uneven quality, could cost you and the end-user far more than the saved material cost. For some types, sizes and pressure classes the price for cladded valves might be higher or equal a solid metal version in the correct material.