SHELL DEP 30.10.02.15 Material restriction
SHELL DEP 30.10.02.15 Material restriction
(OP)
Hello All,
By reviewing the SHELL DEP 30.10.02.15(the MATERIALS FOR USE IN H2S-CONTAINING ENVIRONMENTS IN OIL AND GAS PRODUCTION
(AMENDMENTS AND SUPPLEMENTS TO ISO 15156:2009amendment for ISO 15156) noticed that more environmental restrictions are imposed.On Table A.2 its mentioned that UNS 20910(Nitronic 50) the max allowed temperature is only 66 degC and the allowed H2S partial pressure is 100 kpa.
The allowed temperature is much lower to SS316L(149 degC).Actually the UNS 20910 is better MOC and harder than SS316L.
Moreover for valves its mostly used as Shaft/stem.In ISO 15156 there is a Table A.3 for shaft,stem and pin and it allows UNS 20910 without any restriction.
How these two valid standards be so contrary.Moreover presume that temperature mentioned as Max is only the operating and not the design condition.Please clarify.
By reviewing the SHELL DEP 30.10.02.15(the MATERIALS FOR USE IN H2S-CONTAINING ENVIRONMENTS IN OIL AND GAS PRODUCTION
(AMENDMENTS AND SUPPLEMENTS TO ISO 15156:2009amendment for ISO 15156) noticed that more environmental restrictions are imposed.On Table A.2 its mentioned that UNS 20910(Nitronic 50) the max allowed temperature is only 66 degC and the allowed H2S partial pressure is 100 kpa.
The allowed temperature is much lower to SS316L(149 degC).Actually the UNS 20910 is better MOC and harder than SS316L.
Moreover for valves its mostly used as Shaft/stem.In ISO 15156 there is a Table A.3 for shaft,stem and pin and it allows UNS 20910 without any restriction.
How these two valid standards be so contrary.Moreover presume that temperature mentioned as Max is only the operating and not the design condition.Please clarify.





RE: SHELL DEP 30.10.02.15 Material restriction
XM-19 has been recommended by a lot of vendors for valves and shafts and have been used for many years in clients facility with no known issues.
Since DEP 30.10.02.15 restricts it, client has advised us to stop using the same for new projects.
RE: SHELL DEP 30.10.02.15 Material restriction
2. Some materials have a more restrictive set of environmental variable limits; some have a more relaxed set.
3. The environmental variable limits have been set using an extensive databank of Shell and third party test results
4. Shell's general philosophy is not to entertain ISO 15156-3 tables that contain no environmental variable limits as is the case with Table A.3
5. The environmental variable limits are as given in Table A.2.
6. In using the Shell DEP, the temperature will be the design temperature on the basis that SSC/SCC may occur extremely rapidly should the environmental variable limits be breached. Thus, even a transient excursion to the design temperature may have unacceptable consequences.
7. Item 6 necessitates a clear definition of design temperature and that is given in DEP 01.00.01.30-Gen which you should also be using.
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: SHELL DEP 30.10.02.15 Material restriction
Sorry,self not aware that this DEP is now withdrawn.
so what it been replaced with.Is that replaced one has relaxation on MOC.please advice.
thanks
Viswa
RE: SHELL DEP 30.10.02.15 Material restriction
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: SHELL DEP 30.10.02.15 Material restriction
Example: Check class 13461 - Butterfly Valve