42.-(1) Every air receiver shall-
(a) have marked upon it, so as to be plainly visible, the safe working pressure; and
(b) in the case of a receiver connected with an air compressing plant, either be so constructed as to withstand with safety the maximum pressure which can be obtained in the compressor, or be fitted with a suitable reducing valve or other suitable appliance to prevent the safe working pressure of the receiver being exceeded; and
(c) be fitted with a suitable safety valve so adjusted to permit the air to escape as soon as the safe working pressure is exceeded; and
(d) be fitted with a correct pressure gauge indicating the pressure in the receiver; and
(e) be fitted with a suitable appliance for draining the receiver; and
(f) be provided with a suitable manhole, χειροθυρίδος or other means which will allow the interior to be thoroughly cleaned; and
(g) in a case where more than one receiver is in use in the factory, bear a distinguishing mark which shall be easily visible.
(2) For the purposes of the provisions of the foregoing subsection relating to safety valves and pressure gauges, any set of air receivers supplied with air through a single pipe may be treated as one receiver:
Provided that, in a case where a suitable reducing valve or other suitable appliance to prevent the safe working pressure being exceeded is required to be fitted, this subsection shall not apply unless the valve or appliance is fitted on the said single pipe.
(3) Every air receiver and its fittings shall be of sound construction and properly maintained.
(4) Where the air receiver is used for providing air for ventilation purposes the intake of air to any air compressing plant to which the air receiver is connected shall be from an open space.
(5) Every air receiver shall be thoroughly cleaned, and examined αμέσως προ της εγκαταστάσεως και της διά πρώτην φοράν χρήσεως αυτών εν τινι εργοστασίω και μετέπειτα at least once in every period of twenty-six months:
Provided that in the case of a receiver of solid drawn construction-
(a) the person making any such examination may specify in writing a period exceeding twenty-six months but not exceeding four years within which the next examination is to be made; and
(b) if it is so constructed that the internal surface cannot be thoroughly examined, a suitable hydraulic test of the receiver shall be carried out in lieu of internal examination.
Every such examination and test shall be carried out by an approved person, and a report of the result of every such examination and test, in the prescribed form and containing the prescribed particulars (including particulars of the safe working pressure), shall be entered in or attached to the General Register, and the report shall be signed by the person making the examination or test.
(6) In this section “approved person” means any person who is approved by the Υπουργός, by certificate in writing, for the purpose of carrying out examinations and tests of air receivers in accordance with, and for the purposes of, this section.