dcsp-specs: Fluid Handling, Heat Transfer and Energy Recovery Systems by EnviroSep

Deaerator / Boiler Feedwater & Condensate Surge / Make-up Systems - Specifications

Furnish and install one EnviroSep Model _______DA and Model _______C Deaerator/Boiler Feedwater & Condensate Surge/Make-up Water System rated for ______lbs./hr., ______Boiler Hp for a boiler system operating pressure of ______psig.

GENERAL - This system shall be factory assembled with pump(s), pressure vessel, tank, valving, control devices, fabricated steel frame, interconnection piping( welded per ASME Section IX certified welders), UL-listed Industrial Control Panel factory wired for single-point field connection per NEC. Minimum construction and ratings of all materials shall be consistent with the maximum pressure and temperature at extreme system conditions such as, pump deadhead, over-pressurization, etc. All piping and valving shall be of welded and flanged construction.

DEAERATOR VESSEL - Deaerator vessel shall have 10 minutes minimum storage capacity at normal operating level and shall be fabricated from Carbon Steel plate. Vessel shall carry as standard a U-1 form and have ASME stamp for 50 psig. Frame shall be fabricated with Carbon Steel H-beam and square tubing.

PUMPS - Pumps shall be multi-staged, vertical centrifugal design with complete Stainless Steel liquid handling components, Mechanical Seal with concave seal housing design to ensure flow of liquid at seal area, flanged suction/discharge connections, 316 SS Impellers shall be set automatically with individual stage spacers, and stainless steel outer pump casing. Motor shall be TEFC, NEMA rated with 1.15 service factor. Pump shall be furnished with Cast Iron motor adapter with rigid, cast pump

PNEUMATIC ACTUATED CONTROL VALVES - The control valves shall be pneumatically actuated with flanged valve body constructed of cast iron or cast steel and having stainless steel plug, seat, and stem. The pneumatic actuator shall be of the spring-closed design and shall have a fabric reinforced nitrile rubber diaphragm. Actuator yoke shall incorporate pneumatic, intrinsically safe positioner requiring a 3-15 psig input signal, and compressed air connection for valve operation. The positioner shall compare the pneumatic signal from a controller with the valve position feedback to overcome varying differential pressure, stem friction, and diaphragm hysterisis. Each control valve shall be equipped with a line-size cast steel or cast iron flanged, globe-style bypass valve and inlet/outlet cast steel or cast iron isolation valve arrangement and ensure non-interrupted service during control valve maintenance and servicing.

STEAM CONTROL VALVE - The control valve shall be pilot-actuated, diaphragm-operated, and shall be single-seated, with hardened stainless steel trim and cast steel or cast iron body. The pilot shall be bolted directly to the valve body and shall be removable without disturbing control connections. The setting shall be field adjustable and valve shall be capable of being electrically disabled from operation.

STEAM SEPARATION - Steam separation stations shall be employed on Inlet/Outlet of Steam Control Valve to ensure complete removal of condensed liquid from steam supply to deaerator. Stations shall utilize steam trap of the mechanical ball float type with cast iron body, with all stainless steel internals. A stainless steel balanced pressure thermostatic air vent shall be incorporated into the trap body withstanding 45F of superheat. Inlet/Outlet isolation valves, cast Y-strainer with 100 mesh, and check valves shall be incorporated.

CONTROL PANEL - System shall include two (2) UL - Listed, NEMA 4 or 12, Industrial Control Panel with single-point power connection, pre-wired to all electrical components. Panel shall have thru-the-door fused disconnect; magnetic circuit breaker supplementary motor protector with fast-closing contacts, non-reversing 3-pole contactor, and variable setting, bi-metallic overload relay for each motor; 30 mm Foundry-duty switches; 30 mm Corrosion Resistant pilot lights; control transformer; Operation of each pump shall be Hand-Off-Auto with external connection to terminal blocks for Remote operation. Standby pump(s) shall automatically start on primary pump failure. All internal wiring shall be placed in rigid conduit. (See Control Sequence for sequence of operation.)

CONTROL SEQUENCE - Pumps shall automatically stage On/Off based on actual boiler demand. Lead (Primary) Pump shall automatically alternate based on accumulated run hours. Automatic Stand-by Pump start shall be employed on primary pump failure. Steam shall be enabled only when pumps are operating through use of an electronic control loop. Pump staging and Deaerator Temperature control shall be field-adjustable. Automatic level control shall be incorporated on each tank and vessel with High/Low Level safety alarms and electrical disconnects.

MANUFACTURER - Manufacturer's Factory personnel shall perform on-site assembly and start-up of Deaerator/Boiler Feedwater and Condensate Surge/Make-up System. Manufacturer shall assume system liability, and performance guarantee and warranty all equipment on system for 12 months after initial start-up.