FACTORIES AND MACHINERY (STEAM BOILER AND
UNFIRED PRESSURE VESSEL)
Regulation 49. Location of safety valves.
Every unfired pressure vessel safety valve shall-
(i) be mounted direct on the unfired pressure vessel:
Provided that where this is not practicable the connecting branch shall have an
unobstructed cross-sectional area not less than the area of the safety valve and shall be
as short as practicable:
Provided further that where an air receiver can be isolated from its protecting safety valve
a suitable fusible plug, the fusible portion of which will melt at a temperature of not more
than two hundred degrees Fahrenheit greater than the working temperature of the air
receiver, shall be fitted to it;
(ii) where it is so located that liquid may collect above the valve, be fitted with a drain at
the lowest point where such liquid can collect. Such drain shall not be less than threesixteenths
of an inch in diameter; and
(iii) have an entrance thereto clear and unobstructed by any internal pipe or baffle and so
situated that the carry-over of any viscous substance cannot block it.
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