Question

When boiler are connected to a common steam header and operate under the same pressure:

a) no valve may be set higher the the S.W.P. of the weakest boiler
b) all valves may be set 20% higher than the lowest S.W.P.
c) some valves may be set 20% higher than the lowest S.W.P.
d) set valves according to the S.W.P. of each individual boiler

Answer 1

When boilers are connected to a common steam header and operate under the same pressure, the valves should be set according to the S.W.P. of each individual boiler to maintain safe pressure limits.

Step-by-step explanation:

When boilers are connected to a common steam header and operate under the same pressure, the valves should be set according to the S.W.P. (Safe Working Pressure) of each individual boiler. This means that each valve should be set to the S.W.P. of the boiler it is connected to, to ensure that the pressure is maintained within the safe limits for each boiler.