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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