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Regulation 11. Fittings-general provisions.



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

Regulation 11. Fittings-general provisions.

(1) All fittings for steam boilers shall comply with the following general provisions:
(i) cast iron shall not be used for-
(a) any fitting for service at a temperature greater than four hundred degrees
Fahrenheit or at a steam pressure greater than one hundred and fifty pounds per
square inch; or

(b) any blow-down fitting; or

(c)any feed valve or scum valve directly attached to the steam boiler shell for
service at a pressure greater than one hundred and fifty pounds per square inch;
(ii) bronze or gun-metal shall not be used for any fitting for service at a temperature
greater than four hundred and thirty-five degrees Fahrenheit;

(iii) the seat and valve head of every valve shall be made of metal resistant to corrosion
and no such seat shall be made of cast iron;

(iv) every valve of one and one-half inch bore and over directly fitted to a steam boiler
shell and every valve of two and one-half inch bore and over shall have its cover secured
by bolts or studs;

(v) every screw-down valve fitted with a screwed cover and directly connected to a steam
boiler shall be provided with a suitable cover locking device;

(vi) every valve for use with super-heated steam and valve of two and one-half inch bore
and over and every valve of one and one-half inch bore and over directly connected to
the steam boiler shell shall have an externally screwed spindle;

(vii) every valve having a separate valve seat shall have the same effectively secured;

(viii) every cock of one inch bore and over shall be packed with heat resisting material
and shall have special provision, other than the gland, for securing the plug;

(ix) the body of every fitting shall have been satisfactorily hydrostatically tested at the
manufacturer's or maker's works to a pressure not less than twice its design pressure;
and after assembly every fitting shall be satisfactorily hydrostatically tested to a pressure
not less than one and one-half times its design pressure;

(x) every fitting shall be secured to the steam boiler directly or indirectly, by a flanged
joint:

Provided that a screwed connection not greater than one inch nominal bore may be
provided for any steam boiler having a design pressure of one hundred and thirty pounds
per square inch or less, the screwed part of such fitting being an integral part thereof. In
such case not less than four full threads shall be engaged and where practicable a back
nut shall be fitted. Where the shell thickness is insufficient for this purpose a suitable pad
shall be provided.
(2) Where not otherwise provided in these regulations every steam boiler fitting shall be in
accordance with the provision of British Standard Specification No. 759-Valves and Gauges for
Land Boiler Installations.



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