BLG 4/18
ANNEX 8
DRAFT AMENDMENTS TO CHAPTER 15 OF THE IBC CODE REGARDING CARRIAGE OF CARBON DISULPHIDE
CHAPTER 15-Special requirements
The existing text of section 15.3 is replaced by the following:
"15.3 Carbon disulphide
Carbon disulphide may be carried either under water pad specified in the following paragraphs.
Carriage under water pad
15.3.1 Provision should be made to maintain a water pad in the cargo tank during loading,unloading and transit. In addition, a suitable inert gas pad should be maintained in the ullage space during transit.
15.3.2 All openings should be in the top of the tank, above the deck.
15.3.3 Loading lines should terminate near the bottom of the tank.
15.3.4 A standard ullage opening should be provided for emergency sounding.
15.3.5 Cargo Cargo piping and vent lines should be independent of piping and vent lines used for other cargo.
15.3.6 Pumps may be used for discharging cargo, provided they are of the deepwell or hydraulically driven submersible types. The means of driving a deepwell pump should not present a source of ignition for carbon disulphide and should not employ equipment that may exceed a temperature of 80℃ .
15.3.7 If a cargo discharge pump is used, it should be inserted through a cylindrical well extending from the tank top to a point near the tank bottom. A water pad should be formed in this well before attempting pump removal unless the tank has been certified as gas-free.
15.3.8 Water or inert gas displacement may be used for discharging cargo, provided the cargo system is designed for the expected pressure and temperature.
15.3.9 Safety relief valves should be of stainless steel construction.
15.3.10 Because of its low ignition temperature and close clearances required to arrest its flame propagation, only intrinsically safe systems and circuits should be permitted in the hazardous locations described in 10.2.3.
Carriage under suitable inert gas pad
15.3.11 Carbon disulphide should be carried in independent tanks with a design pressure of not less than 0.6 bar gauge.
