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56. Pressure Plant.- (1) Every plant of machinery other than the working cylinders of prime movers used in a factory, and operated at a pressure greater than atmospheric pressure, shall be :-

(a) of good construction, sound material, adequate strength, and free from any patent defect;

(b) properly maintained in a safe condition;

(c) fitted with :-

(i) a suitable valve or other effective device to ensure that the maximum permissible working pressure of the vessel shall not be exceeded;

(ii) a suitable pressure gauge easily visible and designed to show, at all times, the correct interval pressure in lbs, per square inch, and marked with a prominent red mark at the safe working pressure of the vessels;

(iii) a suitable stop valve or valves by which the vessel may be isolated from other vessels or source of supply of pressure;

(iv) a suitable drain cock or valve at the lowest part of the vessel for the discharge of connected liquid. (d) thoroughly examined by a competent person :-

(i) externally, once in every period of six months, to ensure general condition of the vessel and the working its fittings;

(ii) internally, once in every period of twelve months to ensure condition walls, seams, and ties, both inside and outside the vessel, soundness of the parts of the vessel, and the effects of correction. If by reason of construction of the vessel, a thorough internal examination is not possible, this examination may be replaced by a hydraulic test which shall be carried out once. every two years.

Provided that the vessels in continuous processes which cannot be frequently opened, the period of internal examination may be extended to four years; and

(iii) hydraulically tested at interval or not more than four year provided that in respect of pressure vessels with thin wall such as sizing cylinders made of copper or any other non ferrous metal periodic hydraulic test may be dispensed with on the condition that the requirements laid down in clause (2) are fulfilled.

Provided that it shall be sufficient for the purposes of clauses (e) if the safety valve, pressure gauge and stop valve are mounted on a pipe line immediately adjacent to the vessel & where there is a range of two or more similar vessels in a plant served by the same pressure lead, only one set of such mountings need be fitted provided they cannot be isolated.

(2) (a) In respect of pressure vessels of thin wall such as sizing cylinder made of copper or any other non-ferrous metal the safe working pressure shall be reduced at the rate of 5 per cent of the original working pressure for every year of its use after the first five years and no such cylinder shall be continued to be used for more than twenty years after it was first taken into use.

(b) If no information as the date of construction thickness of walls and safe working pressure is available, the age of the sizing cylinder shall be determined by the competent person in consultation with the Chief Inspector from any other particulars available with the manager.

(c) Every new and second hand cylinder of thin walls to which repairs, which may affect its safety, have been carried out, shall be tested before use to at least one and a half times its working pressure.

(3) Every vessel other than part of a prime mover operated at a pressure greater than atmospheric pressure, and not so constructed as to withstand with safety the maximum permissible working pressure at the sources of supply, or the maximum pressure which can be obtained in the pipe connecting the vessel with any other source of supply shall be fitted with a suitable reducing valve or other suitable automatic device to prevent the safe working pressure of the vessel being exceeded.

(4) In cases owing to the nature of the process or the action of the contents of the vessel, a pressure gauge or safety valve or both cannot work reliable a tested and reliable working thermometer, with a sufficient large scale, on which shall be clearly marked the maximum permissible temperature in the vessel or pyrometers or rupture discs in addition to the pressure gauge and safety valve may be fitted as may be directed by the Chief Inspector.

(5) If during thorough examination, doubt arises as to the ability of vessels to work safety until the next examination provided for in these rules then the competent person shall enter in the register prescribed a reasoned statement, to authorise the vessel for further work subject to a lowering of pressure or to more frequent inspection or subject to both of these requirements.

(6) No vessel which has undergone alterations or repairs shall be taken into use unless it is thoroughly examined by a competent person.

(7) A report of the result of every examination made shall be completed in the prescribed Form No.8 and signed by the person making the examination, and shall be kept available for perusal by an Inspector at any time while the vessel is in service.

(8) No vessel which has previously been used shall be taken into use in any factory for the first time in the factory until it has been examined and reported in accordance with these rules and no new vessel shall be taken into use unless there has been obtained from the maker of the vessel, or from a competent person, a certificate specifying the maximum permissible working pressure thereof, and stating the nature of the tests to which the vessel and its fittings (if any) have been subjected, and the certificate is kept available for perusal by an Inspector and the vessel is so marked as to enable it to be identified, the vessel to which the certificate relates.

(9) Where the report of any examination under this Rule specifies conditions for securing the safe working of vessel, shall not be used except in accordance with these conditions.

(10) The competent person making the report of any examination under this rule, shall within seven days of the completion of the examination send to the Inspector a copy of the report in every case were the maximum permissible working pressure is reduced, or the examination shows that the part cannot continue to be used with safety unless certain repairs and carried out immediately or within a specified time.

(11) The requirements of this rule shall be in addition to and not in derogation the requirements of any other Act, rules or regulations.

(12) Nothing in this rule shall apply to :-

(a) any vessels which comes within the scope of the Indian Boiler Act.

(b) metal bottles of cylinders used for the storage or transport of compressed gases or liquified or dissolved gases under pressure.

(13) The Chief Inspector may exempt, subject to such conditions as may be considered necessary, all or any of the pressure vessels from all or any of the provisions of this rule if he has reason to believe that the construction or use of those vessels is such that the provisions of relating to inspection are not necessary or it is not practicable to comply with them.

 

 

 

 

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