Marine Machinery Regulations

(a) be made of steel or other material suitable for the liquid contents, the intended use and location of the tanks in the ship;

(b) where carbon steel shell plate is used, be of the following minimum plate thickness:

• (i) 2 mm for capacity not exceeding 100 L,

• (ii) 3 mm for capacity not exceeding 1 300 L, and

• (iii) 5 mm for capacity not exceeding 4 500 L;

(c) be fitted with stiffeners so that any unsupported flat surface area does not exceed

• (i) 0.28 m² where plate thickness does not exceed 3 mm, and

• (ii) 0.56 m² where plate thickness does not exceed 5 mm;

(d) be fitted with a suitable clean-out door, where capacity exceeds 1 300 L; and

(e) have welded or brazed seams, except that where the capacity is not more than 100 L, a solder having a melting point of not less than 425°C may be used.

(a) domestic and sanitary

• (i) salt water piping systems,

• (ii) fresh water piping systems, and

• (iii) waste water piping systems;

(b) scupper systems draining inboard but not led within the boundaries of refrigerated chambers;

(c) ballast water and fresh water piping systems situated inside tanks used exclusively for ballast water or fresh water;

(d) sounding and vent pipes to tanks used exclusively for ballast water or fresh water in non-passenger ships except for sections above the weather deck;

(e) sounding pipes to cargo holds in non-passenger ships; and

(f) bilge suction pipes in ships not over 24 m in length.

(a) in fire extinguishing piping systems;

(b) in flammable fluid piping systems;

(c) in boiler feed and condensate piping systems;

(d) in bilge and ballast piping systems in machinery spaces except as provided for in subitem 9 (f);

(e) outboard of sea inlet or overboard discharge valves; and

(f) in other piping systems where the use could compromise the safety of the ship or personnel.

(a) vibration;

(b) chafing where secured in hangers; and

(c) crushing due to overtightening of hanger clamps where they shall be protected by fitting nut-locking or other suitable devices.

(a) the piping on one side of the bulkhead or deck is completely metallic and the valve is fitted to the metallic piping and easily accessible; or

(b) two readily accessible valves are installed, one on either side of the bulkhead or deck.

(a) nature of the fluid to be contained in the tank;

(b) tank volume and level of tank fluid;

(c) tank materials, sizes, plate seams and supports; and

(d) tank openings, vents and other connections.

(a) level of tank fluid exceeds 5 m; or

(b) tank material is other than steel.