Tentative Boiler Safety Orders Prepared By a Sub Committee Representing Various
Tentative Boiler Safety Orders Prepared By a Sub Committee Representing Various
California Industrial Accident Commission
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Irrespective of the size of the valve. The nominal diameter measured at the inner edge of the valve seat shall be not less than 1 in. Or more than 4^ in. 273 Each safety valve shall have plainly stamped or cast on the body: a The name or identifying trade-mark of the manufacturer I The nominal diameter with the words "Bevel Seat" or "Flat Seat" c The steam pressure at which it is set to blow d The lift of the valve disc from its seat, measured immedi- ately after the sudden lift due to the pop ...e The weight of steam discharged in pounds per hour at the pressure for which it is set to blow. 274 The minimum capacity of a safety valve or valves to be placed on a boiler shall be determined on the basis of 6 Ib. Of steam per hour per sq. Ft. Of boiler heating surface for water tube boilers, and 5 Ib. For all other types of power boilers, and upon the relieving capacity marked on the valves by the manufacturer, provided such marked relieving capacity does not exceed that given in Table 8. In case the relieving capacity marked on the valve or valves exceeds the maximum given in Table 8, the minimum safety valve capacity shall be determined on the basis of the maximum relieving capacity given in Table 8 for the particular size of valve and working pressure for which it was constructed.
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