---
kind: "section"
citation: "46 C.F.R. § 154.702"
title: "46"
number: "154.702"
heading: "Refrigerated carriage."
url: "https://uscodex.org/cfr/46/154.702"
---

# §154.702. Refrigerated carriage.

- (a) **Each refrigeration system must—**
  - (1) Have enough capacity to maintain the cargo vapor pressure in each cargo tank served by the system below the set pressure of the relief valves under ambient temperatures of 45 °C (113 °F) still air and 32 °C (89.6 °F) still water with the largest unit in the system inoperative; or
  - (2) Have a standby unit with a capacity at least equal to the capacity of the largest refrigeration unit in the system.
- (b) For the purpose of this section, a “refrigeration unit” includes a compressor and its motors and controls.
- (c) **Each refrigeration system must—**
  - (1) Have a heat exchanger with an excess capacity of 25 percent of the required capacity; or
  - (2) **A standby heat exchanger.**
- (d) Where cooling water is used in a refrigeration system:
  - (1) The cooling water pump or pumps must be used exclusively for the system;
  - (2) Each pump must have suction lines from sea chests on the port and starboard sides of the vessel; and
  - (3) There must be a standby pump, that may be used for:
    - (i) Non-essential purposes on the vessel; or
    - (ii) Essential purposes on the vessel, if the pump is sized to simultaneously provide for the capacity requirements for the essential purposes and the refrigeration cooling water.
- (e) Each refrigeration system must use refrigerants that are compatible with the cargo and, for cascade units, with each other.
- (f) The pressure of the heat transfer fluid in each cooling coil in a tank must be greater than the pressure of the cargo.

## Notes

### Authority

Authority: 46 U.S.C. 3703, 9101; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 74-289, 44 FR 26009, May 3, 1979, unless otherwise noted.