Section 2 Design of Process Systems

201. General

1. The items not specified in this Guidance are to be in accordance with Ch Floating Production Units.

11 of Guidance for

202. Gas treatment systems

1. The produced raw gas from the well is to be removed the acid gas, water and mercury by the gas treatment systems prior to the liquefaction process.

2. Any constituents that may become a solid at the temperatures is to be removed to avoid clogging in the path which the feed gas flowing to the liquefaction systems

203. Liquefaction systems

1. The liquefaction system consists of a pre-cooler, fractionation device and cryogenic cooling device.

2. Leakage from the cryogenic cooling devices are to be isolated and drained. The parts where have the potential to contact with leaked cryogenic fluid to be designed to withstand the low temper- ature, or protected with a shield.

3. All equipment must be designed to operate safely for the unit's motion. The design, support and lo- cation of high structure such as a fractionation tower is to be specially considered.

4. The design is to ensure to prevent contamination of the gas by the refrigerant.

204. Electrical Equipment

For the electrical equipment, requirements of Ch 10, Sec 1 of this Guidance and Pt 7, Ch 5, Sec 10 of Rules for the Classification of Steel Ships are to be complied with.

205. Control systems

1. Control systems are to comply with Ch 10, Sec 2 in addition to requirements in this Article.

2. Control systems for storage of the liquefied gas and transfer of liquefied gas and vaporized gas are to comply with Pt 7, Ch 5, Sec 13 of Rules for the Classification of Steel Ships.

206. Emergency shutdown system

1. An emergency shutdown(ESD) system with manual stations is to be provided to shutdown the flow of hydrocarbon, and to terminate all gas process and liquefaction process on the unit.

2. Loading, offloading and storage system of liquefied gas should be provided with emergency shutoff valves in accordance with Pt 7, Ch 5, 506. of Rules for the classification of steel ships.

3. The emergency shutdown system is to be automatically activated by:

(1) The detection of an abnormal operating condition by flowline pressure sensors and sensors on any downstream component through which the pipeline fluids flow;

(2) The detection of fire in the wellhead and process areas;

(3) The detection of combustible gas at a 60% level of the lower explosive limit (LEL)

(4) The detection of hydrogen sulfide (H2S) gas at a level of 50 ppm.

4. Emergency shutdown stations are to be identified by shutdown function, and shutdown position is to be clearly indicated.

5. Emergency stopping devices are to function independently and be able to operate after the loss of main power.

6. In cases where emergency stopping devices are put into action and the operation of production sys-

tem components are stopped, such components are is made.

not to automatically restart before manual reset