46 C.F.R. § 153.285 Valving for cargo pump manifolds.
Title 46 - Shipping
(a) When cargo lines serving different tanks enter a pumproom and connect to the same pump: (1) Each cargo line must have a stop valve within the line; (2) The valve must be before the cargo line joins the other lines or pump; and (3) The valve must be within the pumproom. (b) The valve in paragraph (a) of this section is required in addition to any valve required under §153.283(b).
Title 46: Shipping
PART 153—SHIPS CARRYING BULK LIQUID, LIQUEFIED GAS, OR COMPRESSED GAS HAZARDOUS MATERIALS
Subpart B—Design and Equipment
Piping Systems and Cargo Handling Equipment
§ 153.285 Valving for cargo pump manifolds.

