Answer / bhola shnaker

there are 2 to 6 numbers of safety valves (SVs) on the boiler.
Around 2 Nos on Drum, of one high and one low setpoint.
Around 2 Nos on Superheater Steam Line of one high and one low setpoint.(but less then Drum SV setpoint, to avoid starvation of SH main steam line)
around 2 Nos on reheater line (if reheater is provided)
Apart from it 1 No of EMRV on the HP superheater line, setpoints below that of Safety valves of the lines.

Also we have Relief valves on he HP econimiser, which acts as a Over protection valve (against Pressure)

Remember SVs are Differnt from Relief valves, as RVs are used on liquid whereas SVs are used on Steam line.

Answer / arun

Totally 9 SV are There
Drum - 3 ( left side-1 , right side-2 )
SH Outlet( MS Line ) - 2
RH Inlet - 1
RH Outlet - 3

This is for BHEL 210MW Boiler

Answer / powerplant.calculations

Boiler interlocks:
1-High & low drum level trip
2-High furnace draught trip
3-Safety valve
4-Boiler explosion vents

Also refer following link to get more information on Boilers
https://www.powerplantandcalculations.com/2020/06/why-how-these-in-boilers.html

Answer / pandian

only 6 safety valves used in reheater boilers normally small capacity boiler used 4 safety valves

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