NACE COMPATIBLE

I doubt it , for a standard 316 S.S

you might require to carry out additional tests to complie with NACE standard.

If you go with 316L then its defnitely compatible with NACE standards.

Read the following spec and more over go through the following spec DEP 39.01.10.11 - GEN - SELECTION OF MATERIALS FOR LIFE PERFORMANCE - NACE SPEC.

The above DEP spec will give you a brief idea of the material which can be used , compatiable for NACE spec.

Use of Stainless Steels

There is a risk of external chloride stress corrosion cracking (Chloride SCC) of stainless steel components in marine environments (offshore and coastal areas) and in some desert environments (high salinity sand with dewing condensation). The use of 304 and 304L is not normally recommended, except in certain specific environments (Appendices 8 and 9).

For the other stainless steels, Chloride SCC can occur if the operating temperature rises above 60 °C for AISI 316L, 100°C for 22Cr duplex and 120°C for 25Cr duplex. There are two possible options to prevent this at the design stage if this is a risk: change to a more resistant material or consider an external coating. Candidate coatings should have a design life at least as long as the design life of the facilities – conventional coatings are not acceptable. A qualified coating should be used with quality control of the surface preparation and coating application.

Thermally sprayed aluminium (TSA) is a suitable coating for external protection of stainless steels. Achieving good external coating of small-bore components (e.g. instrument tubing) is extremely difficult, so changing material is the preferred option. If the consequence of failure is low, the decision might be taken to install a low-cost susceptible material and change it out when it fails. There has been some good experience with using (uncoated) materials at higher operating temperatures combined with very regular cleaning of the surface to prevent salt build-up, but this is not a recommended practice for new designs.

In addition to the cracking, external chloride pitting might also occur at lower temperatures than cracking. Conventional coatings are adequate to prevent chloride pitting if chloride cracking is not an issue.
There is a risk of internal cracking of stainless steel components in situations where the chloride has become concentrated to levels far in excess of that experienced in formation water. The concentration has occurred in flashing conditions where the water is evaporated, leaving a concentrated saline solution. These conditions are typically DEP 39.01.10.11-Gen. January 2005 Page 40
associated with pressure drops e.g. at chokes and pressure control valves. The information on piping included in Table 12 of this DEP gives actual chloride limits for the stainless steel materials, up to a maximum of 250 g/L NaCl, and this type of internal cracking will not occur at these chloride levels. A note has been added to make the user aware of this phenomenon.

Hope the above info is useful

Regards

Rajesh savio

Desidn engineer