PART 3Diving Contractors (continued)
17 A diving contractor who conducts a diving operation must not use or permit to be used a diving submersible in the diving operation unless
(a) the compression chamber of the diving submersible meets the requirements of sections 13, 14 and 16, except paragraphs 16(k) to (n) and subparagraph 16(s)(i);
(b) during any period in which the diving submersible is in use, it is
(i) resting on the bottom,
(ii) firmly secured at or near the work site where it is to be used, or
(iii) secured in a manner that is approved by the Board under subsection 138(4) of the Act or that is approved in accordance with section 4 for the diving program of which the diving operation is a part;
(c) there is a means of maintaining at a safe level the body temperature of a person in the compression chamber of the diving submersible and a person in the water making a dive from the diving submersible; and
(d) a diver is present in the compression chamber of the diving submersible at any time that a dive is in progress.
Oxygen Supply Systems
18 (1) When an oxygen supply system is to be used in a diving operation, the diving contractor who conducts the diving operation must use or permit to be used only an oxygen supply system the design of which complies with the following requirements:
(a) the use of hoses and piping is kept to a minimum;
(b) the materials used are compatible with oxygen at the pressures and temperatures for which the oxygen supply system is designed;
(c) the possibility of contamination of the oxygen by other gases, and vice versa, is minimized;
(d) high-velocity flows of oxygen is avoided;
(e) the differential pressure throughout the oxygen supply system is kept as low as is practicable; and
(f) quick-shut-off valves are not installed in the oxygen supply system except for one-quarter-turn valves that are connected to lines with reduced oxygen pressure and that may be used in an emergency.
(2) A diving contractor who conducts a diving operation must ensure that
(a) any oxygen storage area for the diving operation is
(i) adequately ventilated,
(ii) properly identified with warning signs,
(iii) equipped with a fire suppression system,
(iv) kept clear of and located as far as practicable away from combustible materials, and
(v) if located in an enclosed area, equipped with an oxygen detector and an alarm designed to give warning of oxygen levels in excess of the concentration of oxygen in the ambient air;
(b) any person responsible for handling or otherwise dealing with oxygen is specially trained in that work; and
(c) oxygen is transferred using only pumps, compressors or pressure differential systems that are
Breathing Mixture Supply Systems
19 A diving contractor who conducts a diving operation must use or permit to be used in the diving operation only a breathing mixture supply system that is so designed that
(a) any interruption of the supply of breathing mixture to a person will not affect in any manner the supply of breathing mixture to any other person; and
(b) any failure of the primary supply of breathing mixture to a person will not affect in any manner the supply of breathing mixture to the person from the person’s bailout gas bottle or from the reserve referred to in subparagraph 21(1)(a)(ii).
20 A diving contractor who conducts a diving operation must not use or allow to be used in the diving operation an on-line gas blender or diver’s gas recovery system unless, at all times that the blender or recovery system is in use,
(a) there is a buffer tank in use downstream of the blender or recovery system, as the case may be;
(b) the blended breathing mixture is constantly analyzed for its oxygen content; and
(c) the quantity, referred to in clause 21(1)(a)(iii)(C), of appropriate breathing mixture bypassing, in an emergency, the blender or recovery system, as the case may be, is available for immediate use.
Quantity and Quality of Breathing Mixture
(a) the total quantity of appropriate breathing mixture that is available at any time during the diving operation consists of
(i) an adequate quantity to complete the diving operation,
(ii) a reasonable quantity for a reserve supply, and
(iii) for use in an emergency, an additional supply that is
(A) in the case of a diving operation in which a diving bell is used, a sufficient quantity to meet the needs of the occupants of the diving bell for a minimum of 24 hours,
(B) in the case of a diving operation in which an ADS is used, a sufficient quantity to meet the needs of the occupants of the ADS for a minimum of 48 hours,
(C) in the case of a diving operation in which an on-line gas blender or diver’s gas recovery system is used, a sufficient quantity to allow the divers to continue, interrupt or discontinue the diving operation safely, and
(D) in the case of a diving operation in which a surface compression chamber is used, a quantity that is twice the amount required to pressurize the surface compression chamber to a pressure equivalent to the pressure at the greatest depth in respect of which the surface compression chamber will be used in the diving operation;
(b) the purity of the breathing mixture is of an acceptable standard; and
(c) the quantities referred to in subparagraphs (a)(ii) and (iii) are available for immediate use at a flow rate, temperature and pressure that are safe for the user.
(2) A diving contractor must not conduct a diving operation unless
(a) any breathing mixture to be used in the diving operation is
(b) the levels of oxygen and carbon dioxide in the breathing mixture to be used in the diving operation are maintained at levels that are suitable for the type, depth and duration of the diving operation.
Evacuation, Rescue and Treatment Facilities
(2) The evacuation, rescue and treatment facilities and devices referred to in subsection (1) must be available
(a) for use by persons involved in the diving operation as quickly as possible and within the period for which the life-support system of the surface compression chamber, diving bell or ADS used in the diving operation is capable of maintaining the life of the occupants; and
(b) where practicable, on site.
23 A diving contractor who conducts a diving operation must
(a) ensure that at all times during the diving operation each diving crew involved in the diving operation includes a hyperbaric first-aid technician available on the craft or installation from which the diving operation is being conducted;
(b) arrange for the services, on a 24-hour-a-day basis, of a specialized diving doctor, referred to in paragraph 3(3)(d), who is familiar with the diving procedures to be used in the diving operation and who is within a travelling distance of the diving operation that is acceptable to the Chief Safety Officer, to provide medical assistance in the event of an emergency;
(c) ensure that an adequate means of communication exists on a 24-hour-a-day basis between the specialized diving doctor referred to in paragraph (b) and
(d) locate the nearest surface compression chamber that is compatible with the equipment used in the diving operation and that is suitable for the type, depth and duration of the diving operation being conducted and make arrangements for the use of that surface compression chamber in the event of an emergency.
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