What are regulations or requirements for gas detector on ship?

Following table indicates the number of gas detecting equipment to be maintained on board:

	Equipment	Type	Numbers (Minimum)
1.	HC Detector for non-inerted atmosphere	Portable	2 nos.
		Personal *	2 nos.
2.	HC Detector for inerted atmosphere	Portable	2 nos.
3.	Oxygen Analyser	Portable	2 nos.
		Personal *	2 nos.
4.	Toxic Gas Detector or Dragger Tube (combined or individual)	Portable	2 nos.
		Personal *	2 nos.

Note -*  Only 2 nos. Multi-gas Personal Detectors are required, if they are of combined type.