SigmaFire Installation Manual, rev. F - Clayton Industries

Section IIITable 3-1: Hotwell (Open) and Deaerator SystemsCustomerConnectionSkid TypeFeedwater aOutlet Vent Drain OverflowOverflow/DrainCondensateReturnsTrapsReturnsSteamHeatingChemicalInjectionMakeupWaterNone X X X X X X X X XCondensate Skid X X X X X X X X XWater Skid X X X X X X X XGenerator Skid X X X X XaFeedwater outlet connections apply only on Condensate and Water Skids without Booster Pumps.CustomerConnectionsTable 3-2: Hotwell (Open) and Deaerator SystemsBooster Pump(s) Water Softener(s) Blowdown TankCoolingWaterInletSafetyValveOutDA ONLYBPRSkid Type Inlet Outlet Recirc Inlet Outlet Drain Inlet Outlet VentOutletNone X X X X X X X X X X X X XCondensate Skid X X X X X X X X X X XWater Skid X X X X X X XGenerator Skid X X X X X X XPRVInlet3.4 OPEN SYSTEM(Refer to P&ID drawing R-19477.)In an open system, the makeup water, condensate returns (system and separator trapreturns), chemical treatment, and heating steam are blended in an atmospheric feedwater receivertank, (vented to atmosphere - under no pressure). Open feedwater receiver systems are sized toprovide the necessary volume of feedwater and sufficient retention time for the chemical treatmentto react. Condensate, separator trap returns and feedwater treatment chemicals are injectedat the opposite end of the tank as the feedwater outlet connection. This helps to avoid potentialfeedwater delivery problems to the booster or feedwater pump(s), and to provide sufficient reactiontime for the chemical treatment.04/22/2015 3-3 Sect03_FeedwtrSys_SF_f.fm