46 CFR §56.35-10

1. (a)Nonmetallic expansion joints must conform to the standards listed in table 2 to § 56.60-1. Nonmetallic expansion joints may be used within their specified pressure and temperature rating in vital and nonvital machinery sea connections inboard of the skin valve. These joints must not be used to correct for improper workmanship or misalignment. Joint movements must not exceed the limits set by the joint manufacturer.
2. (b)[Reserved]