In the 600 psi steam system, what path does the auxiliary steam take to service?

In the 600 psi steam system, what path does the auxiliary steam take to service?

• A. Through two valves, stop-check valve and motor-operated valve
• B. Directly from boiler to service with no valves
• C. Through a desuperheater only
• D. Through a gate valve and relief valve

Answer: (A)

In a 600 psi steam system, the way auxiliary steam reaches service must be both safeguarded and controllable. That’s why the steam path goes through two valves: a stop-check valve for immediate isolation and backflow prevention, followed by a motor-operated valve that is remotely actuated to regulate the steam flow to the service. The stop-check valve ensures that once you shut it, steam can’t flow backward toward the boiler, which is essential in high-pressure systems. The motor-operated valve provides precise, automated control of the steam supply to meet demand and can be operated from the control room or automatically by the system. Relying on a direct line from the boiler with no valves would lack necessary isolation and backflow protection. Using only a desuperheater would not provide the required shutoff and control path for delivering steam to service. A path through a gate valve and relief valve would fail to provide proper remote control and could waste steam by venting through the relief valve, rather than supplying the service.

In a 600 psi steam system, the way auxiliary steam reaches service must be both safeguarded and controllable. That’s why the steam path goes through two valves: a stop-check valve for immediate isolation and backflow prevention, followed by a motor-operated valve that is remotely actuated to regulate the steam flow to the service. The stop-check valve ensures that once you shut it, steam can’t flow backward toward the boiler, which is essential in high-pressure systems. The motor-operated valve provides precise, automated control of the steam supply to meet demand and can be operated from the control room or automatically by the system.

Relying on a direct line from the boiler with no valves would lack necessary isolation and backflow protection. Using only a desuperheater would not provide the required shutoff and control path for delivering steam to service. A path through a gate valve and relief valve would fail to provide proper remote control and could waste steam by venting through the relief valve, rather than supplying the service.