TR Specification

Model TR Deaerator

Specification

Furnish and install as one Tray Type Deaerating Heater as designed and manufactured by Precision Boilers.  Deaerator shall be model number ___________ and shall consist of the following:

(1)  Basic:  _____PPH Tray Type Deaerator with a capacity of _____ gallons to overflow (______ minutes of storage).  Storage vessel shall be ______ diameter by ______ shell length (not including heads) and shall be constructed in accordance with the ASME code (latest revision).  Deaerator shall include connections as follows:  water inlet ____, steam inlet______, pump suction ______, overflow________, relief valve and vacuum breaker (common)_______, vent ______, vessel drain ______,thermometer________, pressure gauge_______, 12” x 16” mainway (minimum) and all water level instrumentation equalizing connections required for operation (minimum of four).  Each pump suction shall be equipped with a vortex breaker which must be constructed as follows:  cross plate design of ¼” material and dimensionally two times greater than the nozzle diameter (minimum). Deaerator shall operate at all flows with a 20:1 turndown ratio, shall deaerated the water so that the oxygen in the effluent leaving the deaerator storage tank shall not exceed .005 cc/liter as determined by the Heat Exchange Institute method, Winkler method, or any other leading testing method approved by ASTM, and shall reduce the titratable free CO2 to zero as determined by the APHA testing method.  The Tray Deaerator shall have spray valves which shall be #316 stainless steel, be non-binding, and have a guide bar.  Deaerator shall have an internal direct contact vent condenser.  Tray enclosure shall be #304 stainless steel with a ¼” minimum wear plate.  Tray box will be equipped with a gliding tray door system for ease of tray inspection and removal.  Trays shall be constructed of #430 stainless steel and shall be all riveted.  No welding of trays will be acceptable.  Operation shall be of the counterflow design; water shall enter vent condenser, go through spray valves and cascade downward over trays while the steam will enter through the bottom of tray box, moving upwards through the trays.  The result of the counterflow operation will be fully Deaerated Water exiting the tray section and spilling into the storage section..

(2) Operating Conditions:                    

Returns:  Low Temp (<227^º F)     _____%@_____ ^ºF
High Temp (>227^º F)    _____%@_____ ^ºF

Make-Up:  _____PSIG                _____%@_____ ^ºF

(3) System Components:  Other integral and necessary components shall be per specification and shall include instruments (sight, temperature and pressure gauges, and level and pressure controls); level control valve (mechanical, electric, electro-pneumatic, pneumatic); feedpump(s) (turbine, multi-stage centrifugal, etc.); overflow drainer; vacuum breaker; relief valve (sentinel or full capacity); pump suction stop valve, strainer and vibration isolator; pump discharge stop valve, check valve, bypass orifice or relief valve, pressure gauge, etc.; NEMA____UL-Labeled control cabinet to include necessary pilot lights, switches, control transformer, disconnects, starters, logic relays, etc.

Specifications subject to change without notice.