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Regulation 15. Blow-down valves and cocks.



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

Regulation 15. Blow-down valves and cocks.

(1) Every blow-down valve or cock fitted to a steam boiler shall-
(i) have a bore not less than one inch in diameter; and

(ii) be fitted with a device which shall indicate clearly the open and close positions.
(2) Every blow-down cock shall be of the bolted cover or double gland type.

(3) Every blow-down valve or cock fitted to a shell-type steam boiler shall be attached direct to
the steam boiler shell as near as practicable to the lowest part thereof;
 
Provided that in the case of a horizontal cylindrical steam boiler it may be attached to a cast steel
tapered elbow of substantial construction and adequate cross-section.

(4) Where the blow-down pipes of two or more steam boilers are led into a common main, an
isolating valve of the screw down non-return type shall be fitted between the blow-down valve or
cock on every steam boiler and the common main. In such case only one operating key shall be
provided for the blow-down valve or cocks.



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