R016600x

Section VII - Optional Equipment

7.5.2 Clayton Back Pressure Regulators

Clayton BPRs are spring-loaded, diaphragm-operated. The BPR must be installed in the separator discharge pip- ing (as shown in Figure 1). Install the Clayton BPR verti- cally with the outlet at the top. 7.5.3 Buyout (non-Clayton) Back Pressure Regulators For buyout BPRs, refer to the manufacturer’s installation and operator instructions for proper installation. 7.5.4 Pilot-Operated and Electro- Pneumatic Back Pressure Regulators Pilot-operated BPRs are designed to be mounted at the steam header top elevation, immediately next to the steam

Figure 1 - Clayton BPR Installation

stop valves above Clayton’s separator. They are not meant to be floor mounted. Fluid traps must be incor- porated into the pilot lines to prevent BPR liquid lockout. Customers who desire mounting BPRs at floor level must use pilotless, electro-pneumatic BPRs. Electro-pneumatic BPRs (Figure 2) may be purchased from

Clayton Industries. Electro-pneumatic BPRs require additional PLC module hardware and control programming in the electrical control box. 7.5.5 Pressure Regulating Valves Pressure Regulating Valves (PRV) control the pressure in the feedwater supply vessel, either D/A or Semi-closed Receiver (SCR) Systems. These valves ensure positive pressure is main- tained on these vessels. The PRV receives steam from the main header and injects steam into the tank when a drop in pressure is detected. A check-valve must be installed in this line to protect the system in the event of flooding the tank.

Figure 2 - Electro-pneumatic BPR valve (for illustration purpose only, actual valve may be different)

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