• 9.89.1.1LPG fuel service lines that are subjected to container pressure shall be manufactured from one of the following—
  • (a)Copper-brazed steel tubing complying with AS 1751 or ASTM A254, terne-coated;
  • (b)Seamless stainless steel tubing complying with ASTMA269; or
  • (c)Hose or a hose assembly complying with AS /NZS 1869.

• 9.89.2.1Size of tubing

  The tubing shall have a nominal wall thickness not less than 0.91mm if under 10mm diameter, or not less than 1.02mm if 10mm or larger, and shall be no larger than that required to satisfy the maximum requirements of the engine. In no case shall the tubing be less than 6mm outside diameter.

• 9.89.2.2Configuration
  • 9.89.2.2.1Tubing joints and connections shall comply with regulation 9.89.4. The number of joints and connections in a fuel service line shall be minimized. Tubing joints and connections manufactured by the installer shall be restricted to the connection of essential components.
  • 9.89.2.2.2Tubing shall not be used between parts that can move in relation to each other (eg between the ship and the engine).

Where a fuel service line is manufactured from hose, the hose and hose assembly shall be of a class suitable for the pressure and temperature of the application, in accordance with relevant national and/or international standards.

Olive-or ferrule-type fittings shall not be used in any joint or connection subjected to container pressure. Joints used for connecting or mounting tubing, hose assemblies or components subjected to container pressure shall be one of the following—

• (a)For tubing, the joint shall be a 90° double-flared connection in accordance with AS D26 or SAE J533;

• (b)a flanged joint;
• (c)a welded or brazed joint, provided that such joints are limited to components assembled during manufacture;
• (d)a screwed joint provided that when the thread is used as a seal, only taper to-taper threads are used; or
• (e)a ground-face union.

Fuel service lines shall be installed in accordance with the following—

• (a)They shall be routed such that they are protected against mechanical damage by the ship’s structure in the event of impact or collision. They should follow the shortest practicable route;
• (b)Any tubing likely to be subjected to corrosion shall be adequately protected;

NOTE: Clear plastic tubing is not suitable for providing protection from corrosion as the marine environment causes it to change colour, thus impairing visibility for inspection.

• (c)They shall be secured to the ship’s structure by metallic clips. Such clips shall be spaced at intervals not exceeding 600mm. In order to prevent the possibility of fretting, corrosion or erosion of the fuel service lines, cushioning shall be provided to protect them from the ship’s structure and the clips themselves. Grommets shall be fitted where the fuel service line passes through the ship’s structure; and
• (d)Where a fuel service line (including any of its joints or connections) or any connected component or fitting is subjected to container pressure, and is located within 150mm of an object at a temperature above the normal water jacket temperature of the engine, a heat shield shall be fitted.

NOTE: Such heat sources include parts of the exhaust system, turbochargers and compressors.

• 9.89.6.1Where there is more than one container in an installation, and the liquid spaces in the containers are connected to a common fuel service line—
  • (a)a spring-loaded non-return valve shall be installed between each container and the common fuel service line; and
  • (b)a relief valve complying with regulation 9.89.7 shall be fitted to the common fuel service line.
• 9.89.6.2Manifolds used in multi-container installations shall be installed in a protected location.

A relief valve shall be set to operate at 3.1 MPa, and shall be installed in accordance with the following—

• (a)The discharge shall be directed away from enclosed spaces and sources of ignition; and
• (b)The valve shall be protected from mechanical damage and shall be accessible for inspection and service.

Fuel service lines for applications under 100 kPa shall comply with the following—

• (a)Hose shall comply with the Class B requirement of AS/NZS 1869, and shall be of sufficient length and flexibility to accommodate engine movement; and
• (b)Joints and connections shall be capable of sustaining a pressure 5 times the maximum pressure likely to be encountered in service. They shall comply with subparagraph 9.89.2.2 and 9.89.4. Pipework for safety valve discharges in applications less than 100 kPa shall comply with paragraph 9.88.11.5 (b).