46 CFR § 153.463
Vent system discharges
April 15, 2021
The discharge of a venting system must be at least 10 m (approx. 32.8 ft) from an ignition source if:
(a) The cargo tank is endorsed to carry a flammable or combustible cargo; and
(b) Table 1 requires the cargo to have a PV venting system.