R020932J1, Install Manual

STEAM GENERATOR & FLUID HEATER INSTALLATION MANUAL

5.3 INSTALLATION

(Refer to Figures 5-1, 5-2, and 5-3.)

5.3.1 General As shown on Figures 5-3 three sizes of trap separators have been designed to handle a broad range of boiler horsepowers. Typical dimensions for each trap separator are provided in Figure 3. Line sizes for the trap separator connections are provided and should be kept full size (no reductions). The trap separa- tor and connected piping must be properly supported. The trap separator is maintained at the same pres- sure and water level as the feedwater receiver and should be installed at an elevation that puts the water The trap separator vent line must be large enough to handle the flash steam with little or no pres- sure drop and without affecting the water level. Proper vent line sizes for specific horsepower ranges are indicated on Figures 5-1 and 5-2 and must not be reduced. On deaerator (DA) applications the vent flash steam should be introduced into the same section of the deaerator as the Pressure Regulating Valve (PRV) steam injection. On open system applications, the vent line should be introduced to the top of the feedwater receiver. Refer to Figure 5-1. The trap separator outlet is tied into the booster pump(s) feedwater supply line from the common feedwater receiver. The outlet piping should be constructed so as to provide the required NPSH to the booster pump(s) inlet. (any frictional loss subtracts from the available NPSH). The outlet piping should contain a minimum number of elbows and fittings, and no valves or check valves. 5.3.3 Feedwater Receiver Supply Lines Provisions should be made for the feedwater receiver to have independent feed lines for the Clay- ton and conventional boiler feedwater supply. If not isolated, there is a potential for the larger feedwater pumps of the conventional boiler system to draw the water out of the trap separator and away from the Clayton feedwater supply system. This disrupts the chemical treatment in both systems and may cause water shortage and pump cavitation problems in the Clayton system. If independent feed lines are not possible, a swing check valve must be installed in the feedwater supply line to prevent backflow away from the Clayton system. (Refer to Figure 5.1) level midpoint in the sight glass. 5.3.2 Trap Separator Vent

5-2

Sect05_TrapSeparator_SF_e.fm

04/22/2015