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Regulation 72. Hydrostatic tests.



                                    P.U.(A) 5/70
FACTORIES AND MACHINERY (STEAM BOILER AND
                   UNFIRED PRESSURE VESSEL)
                           REGULATIONS, 1970
          PART IV - MISCELLANEOUS PROVISIONS

Regulation 72. Hydrostatic tests.

(1) Every steam boiler and unfired pressure vessel shall, before being put into service for the first
time, be subjected to a hydrostatic test-
(a) of twice the authorised safe working pressure where such pressure is not more than
one hundred pounds per square inch; and

(b) of one and a half times the authorised safe working pressure plus fifty pounds where
such pressure exceeds one hundred pounds per square inch:

Provided that where any steam boiler or unfired pressure vessel complies with the
standard conditions in regulation 7 or where there is evidence that it has been
satisfactorily tested hydrostatically at the manufacturer's or maker's works in accordance
with the above, the Inspector may in his discretion carry out a hydrostatic test to one and
one-half times the authorised safe working pressure only.

(2) Such steam boiler or unfired pressure vessel shall withstand satisfactorily such hydrostatic
pressure without appreciable leakage or undue deflection or distortion of its parts for at least
twenty consecutive minutes.

 (3) After any repair affecting the strength of any steam boiler or unfired pressure vessel, the
Inspector may require it to be tested hydrostatically to one and one-half times the authorised safe
working pressure.

(4) Every steam boiler shall be tested hydrostatically at intervals not exceeding seven years.

Provided that where any steam boiler by reason of its construction, cannot be inspected
thoroughly internally, an Inspector may require such steam boiler to be tested hydrostatically after
any regular inspection.

(5) Where by reason of its construction an unfired pressure vessel cannot be inspected
thoroughly internally, an Inspector may require such unfired pressure vessel to be tested
hydrostatically after any regular inspection.

(6) Where in the opinion of the Inspector the hydrostatic test of any steam boiler or unfired
pressure vessel is not satisfactory the authorised safe working pressure of such steam boiler or
unfired pressure vessel shall be reduced by an amount which the Chief Inspector may deem to
be appropriate:

Provided that where the owner of such steam boiler or unfired pressure vessel makes such
alterations thereto as will enable it to withstand to the satisfaction of the Inspector a further
hydrostatic test the authorised safe working pressure may be retained.

(7) During a hydrostatic test of any steam boiler or unfired pressure vessel the safety valve
thereof shall be removed.
(8) All pipes and pipe fittings shall be satisfactorily tested hydrostatically to twice the authorised
safe working pressure of the steam boiler or unfired pressure vessel to which they are to be fitted,
before erection on site:

Provided that where an Inspector is satisfied that such pipes and pipe fittings have been
satisfactorily so tested at the manufacturer's or maker's works he may require a hydrostatic test to
one and one-half times the authorised safe working pressure only.

(9) Where the joints in a pipe system are of welded construction the system shall, after erection
on site be tested hydrostatically to twice the authorised safe working pressure of the steam boiler
or unfired pressure vessel to which it is fitted or such joints shall be completely radiographed.

(10) No person shall, without the approval in writing of an Inspector, test any part of a steam
boiler or unfired pressure vessel or the fittings thereof or any pipes or pipe fittings, for pressure
tightness by any means other than water pressure.

(11) After any satisfactorily hydrostatic test and on payment of the prescribed fees for such test
an Inspector shall issue to the owner a certificate in the form shown in the sixth Schedule to these
regulations.



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