 |
Reg. 364
Valves Chests
| a) |
Chests of stop-valves, isolating
values, reducing valves, steam traps, etc., forming parts
of wrought steel main steam piping when for use with saturated
steam up to a gauge pressure of 160 lbs. per square inch
or a temperature of 400°F may be made of cast iron,
cast steel or wrought steel in accordance with the requirements
of Regulation 290. |
| b) |
When superheated steam is used
above 400°F or when pressure are above 160 lbs. per
sq. in. gauge, such chests shall be made of cast or wrought
steel or other approved material in accordance with the
requirement of Regulation
290. |
|
|
