metboss
Petroleum
- Sep 12, 2012
- 152
Hi all
We placed the order to vendor a year ago for the procurement of Sub-surface safety valve (Drilling) which has 17-4 Precipitation Hardened stainless steel as a trim material (Disc + seat) compliance to NACE MR-0175 (2009 Ed). Recently, we received partial quantity with 17-4 PH trim with NACE compliance.
Now for remaining quantity, vendor is come up with a query mentioning that as per new NACE guidelines, 17-4 PH SS cannot be used for trim & can’t be complied with NACE MR-0175 requirements.
Instead, now, they are proposing Inco 925 material with NACE compliance for trim in place of 17-4 PH SS with cost impact (high cost).
My questions are:
1)Did NACE issue a new guidelines that prohibits the usage of 17-4 PH SS for trim ? If so, as per which edition/circular and when it was issued ?
Is there any grace period for manufacturer so that 17-4 PH SS can still be certified to NACE MR-0175. Please give clause/table reference for such grace period provision.
2)Can we still use 17-4 PH SS for trim and is there any risk if we use old NACE reference?
(Our service fluid H2S partial pressure is below 200 ppm and other factors are okay with NACE MR-0175(2009 ed) table A.27)
Regards
We placed the order to vendor a year ago for the procurement of Sub-surface safety valve (Drilling) which has 17-4 Precipitation Hardened stainless steel as a trim material (Disc + seat) compliance to NACE MR-0175 (2009 Ed). Recently, we received partial quantity with 17-4 PH trim with NACE compliance.
Now for remaining quantity, vendor is come up with a query mentioning that as per new NACE guidelines, 17-4 PH SS cannot be used for trim & can’t be complied with NACE MR-0175 requirements.
Instead, now, they are proposing Inco 925 material with NACE compliance for trim in place of 17-4 PH SS with cost impact (high cost).
My questions are:
1)Did NACE issue a new guidelines that prohibits the usage of 17-4 PH SS for trim ? If so, as per which edition/circular and when it was issued ?
Is there any grace period for manufacturer so that 17-4 PH SS can still be certified to NACE MR-0175. Please give clause/table reference for such grace period provision.
2)Can we still use 17-4 PH SS for trim and is there any risk if we use old NACE reference?
(Our service fluid H2S partial pressure is below 200 ppm and other factors are okay with NACE MR-0175(2009 ed) table A.27)
Regards
