Section 2 Approval of Plans and Documents

201. Plan and Documents

For a ship in which natural gas-fuelled engine installations are installed, plans and docu- ments(triplicate for approval and 1 copy for reference), specified below para. 202 and 203, are to be submitted and approved before the work is commenced. And, the Society, where considered nec- essary, may require further plans and documents other than those specified below.

202. Plan and data for approval

1. Arrangement plans showing location of:

(1) Machinery spaces, accommodation, service and control station spaces

(2) Gas tanks and gas containment systems

(3) Gas pump and compressor rooms

(4) Gas piping with shore connections

(5) Tank hatches, ventilation pipes and any other openings to the gas tanks

(6) Ventilating pipes, doors and openings to gas pump rooms, compressor rooms and other hazard-

ous areas

(7) Entrances, air inlets and openings to accommodation, service and control station spaces

(8) Hazardous areas of zone 0, 1 and 2

2. Following plans and data of the gas fuel containment system:

(1) Drawing of gas tanks including information on non-destructive testing of welds and strength and tightness testing of tanks

(2) Drawings of support and staying of gas tanks

(3) Specification of materials in gas tanks and gas piping systems

(4) Specifications of welding procedures for gas tanks

(5) Specification of stress relieving procedures for independent tanks type C (thermal or mechanical)

(6) Specification of design loads and structural analysis of gas tanks

(7) A complete stress analysis for gas tanks

(8) Specification of cooling-down procedure for gas tanks

(9) Arrangement and specifications of second barriers

(10) Drawings and specifications of gas tank insulation

(11) Drawing of marking plate for gas tanks

3. Following plans and data of piping systems:

(1) Drawings and specifications of gas piping including ventilation lines of safety relief valves or similar piping

(2) Drawings and specifications of offsets, loops, bends and mechanical expansion joints, such as

bellows, slip joints(only inside tank) or similar means in the gas piping

(3) Drawings and specifications of flanges, valves and other fittings in the gas piping system. For valves intended for piping systems with a design temperature below - 55 °C, documentation for leak test and functional test at design temperature (type test) is required

(4) Complete stress analysis of piping system when design temperature is below - 110 °C

(5) Documentation of type tests for expansion components in the gas piping system.

(6) Specification of materials, welding, post-weld heat treatment and non-destructive testing of gas piping

(7) Specification of pressure tests (structural and tightness tests) of gas piping

Ch 1 General Ch 1

(8) Program for functional tests of all piping systems including valves, fittings and associated equipment for handling gas (liquid or vapour)

(9) Drawings and specifications of insulation for low temperature piping where such insulation is

installed

(10) Specification of electrical bonding of piping

(11) Specification of means for removal of liquid contents from bunkering pipes prior to dis- connecting the shore connection

(12) Cooling or heating water system in connection with gas fuel system, if fitted.

4. Following plans and particulars for the safety relief valves

(1) Drawings and specifications for safety relief valves and pressure/vacuum relief valves and asso- ciated ventilation piping

(2) Calculation of required gas tank relief valve capacity, including back pressure

(3) Specification of procedures for changing of set pressures of cargo tank safety relief valves if such arrangements are contemplated

(4) Calculations for safety valves ventilation mast : location, height, details

5. Following plans and data for equipment and systems regarding fire protection :

(1) Arrangement and specification of water spray system, including pipes, valves, nozzles and fittings

(2) Arrangement of ventilation duct required for gas pipes lead through enclosed spaces

(3) Arrangement of ventilation duct for storage tank fitted below deck, if applicable

(4) Arrangement of fire detection system for storage tank and ventilation trunk

(5) Arrangement

of fire insulation for storage tank and pipes, ventilation trunks for storage tank room

(6) Arrangement and specification of dry chemical powder installation.

6. Following plans and data for electrical installations :

(1) Drawing(s) showing location of all electrical equipment in hazardous areas and data for ver- ification of the compatibility between the barrier and the field component

(2) Single line diagram for intrinsically safe circuits

(3) List of explosion protected equipment with reference to drawings together with certificates

7. Following control and monitoring systems :

(1) Gas detection system

(2) Gas tank monitoring system

(3) Gas compressors control and monitoring system

(4) Gas engines control and monitoring system.

8. A test program for the safety functions of the gas installation (may be included in pro- gramme for sea trials or on-board test)

9. Data for a risk analysis according to Ch.3 101. 1.

203.

Plans and documents for reference

1. Plans and data of the following equipment and systems

(1) Drawings showing location and construction of air locks with alarm equipment, if fitted

(2) Drawings of gastight bulkhead penetrations, if fitted

(3) Arrangements and specifications of mechanical ventilation systems in spaces covering gas fuel system, giving capacity and location of fans and their motors. Drawings and material specifica-

tions of rotating parts and casings for fans and portable ventilators

(4) Drawings and specifications of protection of hull steel beneath liquid piping where liquid leak- age may be anticipated, such as at shore connections and at pump seals

(5) Arrangement and specifications of piping systems for gas freeing and purging of gas tanks

(6) For fixed gas detection and alarm systems: specification and location of detectors, alarm devices and call points, and cable routing layout drawing

(7) Bilge and drainage arrangements in gas pump rooms, compressor rooms, tank rooms

(8) Exhaust gas system.

2. Calculation sheets of filling limits for cargo tanks.

3. Operation manual(including bunkering, gas freeing, normal operation, emergency oper- ation).