46 CFR § 154.802
Alternate pressure relief settings
April 15, 2021
Cargo tanks with more than one relief valve setting must have one of the following arrangements:
(a) Relief valves that:
(1) Are set and sealed under §154.801(c);
(2) Have the capacity under §154.806; and
(3) Are interlocked so that cargo tank venting can occur at any time.
(b) Relief valves that have spacer pieces or springs that:
(1) Change the set pressure without pressure testing to verify the new setting; and
(2) Can be installed without breaking the sealing wire required under §154.801(c)(3).