Steam generation at high pressure helps you to reduce the initial investment cost since at high pressure the specific volume
of steam is lower than that at low pressure, which requires a small diameter pipe to carry the steam and reduces the cost associated
with the pipe , which leads to a reduction in the initial investment cost. The high-pressure steam generation allows
relatively less carryover and provides better-quality steam, as at low pressure, carryover is more likely to occur. Using a high-pressure
boiler allows you to use the steam in different applications at different pressures by using the PRV. It also provides the
flexibility for variable
load. A sudden increase in load reduces the boiler pressure and increases the carry over and moisture content in the steam.
The PRV eliminates this and allows constant pressure to be maintained in the boiler. Furthermore, generating steam at high pressure
is relatively cheaper than using the low-pressure boiler, so it reduces fuel consumption.
Now we have a brief idea of what benefits PRS serves. Any porous plug or orifice valve which reduces the cross-section area across the flow,
works as a pressure reducer, but during the fluctuating loading, the outlet pressure of the valve will also fluctuate, which is not desirable,
so to eliminate the above issue, we use the PRV, which provides a constant pressure during the variable loading also.