46 C.F.R. Subpart 105.25—Additional Requirements—When Cargo Tanks Are Installed Below Decks
Title 46 - Shipping
(a) Cargo tank and piping systems shall be as described in Subpart 105.20. (a) Compartments or areas containing tanks or pumping systems shall be closed off from the remainder of the vessel by gastight bulkheads. Such gastight bulkheads may be pierced for a drive shaft and pump engine control rods if such openings are fitted with stuffing boxes or other acceptable gland arrangements. (a) Each compartment shall be provided with a mechanical exhaust system capable of ventilating such compartment with a complete change of air once in every 3 minutes. The intake duct or ducts shall be of sufficient size to permit the required air change. The exhaust duct or ducts shall be located so as to remove vapors from the lower portion of the space or bilges. (b) The ventilation outlets shall terminate more than 10 feet from any opening to the interior of the vessel which normally contains sources of vapor ignition. The ventilation fan shall be explosion proof and unable to act as a source of ignition. (a) Cargo pumps shall not be installed in the cargo tank compartment unless the drive system is outside the compartment. (b) Suction pipelines from cargo tanks shall be run directly to the pump, but not through working or crew spaces of vessel. (a) Tanks shall be located so as to provide at least 15&inch; space around tank, including top and bottom to permit external examination. (a) Shutoff valves shall be provided in the suction lines as close to the tanks as possible. The valves shall be installed so as to shut off against the flow. (b) Remote control of this shutoff valve shall be provided where deemed necessary by the marine inspector.
Title 46: Shipping
PART 105—COMMERCIAL FISHING VESSELS DISPENSING PETROLEUM PRODUCTS
Subpart 105.25—Additional Requirements—When Cargo Tanks Are Installed Below Decks
§ 105.25-1 General requirements.
§ 105.25-5 Compartments or areas containing cargo tanks or pumping systems.
§ 105.25-7 Ventilation systems for cargo tank or pumping system compartment.
§ 105.25-10 Cargo pumping installation.
§ 105.25-15 Spacings around tanks.
§ 105.25-20 Shutoff valves required.
