46 CFR § 132.330
Fire monitors
April 15, 2021
(a) Each fire monitor of the fire main system must be fitted with a shut-off valve at the monitor and at the connection to the fire main discharge manifold required by §132.120(h) of this part.
(b) Fire monitor piping must comply with §132.110 of this part.
(c) Each fire monitor must be protected against over-pressure.