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Table of Contents
Related Manuals for Precision SP
Summary of Contents for Precision SP
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Page 1: Title Page
Installation and Operating Instructions TYPE ‘SP’ SPRAY & ‘TR’ Tray DEAERATOR... -
Page 2: Introduction
Read this manual thoroughly and follow the instructions herein. The PRECISION Boilers shall be installed according to the procedures detailed in this manual, or the Precision Boilers Limited Warranty may be voided. The installation must conform to the requirements of the local jurisdiction having authority, and to the latest edition of the National Fuel Gas Code, ANSI Z223.1. -
Page 3: Table Of Contents
TABLE OF CONTENTS i Title page ............... 1 6.2 Vacuum Breaker ............11 ii Introduction ............2 6.3 Vessel Pressure Gauges ..........11 iii Index ..............3 Steam Velocity Chart ............12 1.0 PRINCIPLES OF DEAERATION Example ................. 13 1.1 Corrosion ............4 7.0 SYSTEM START-UP 1.2 Common Gases.......... -
Page 4: Principles Of Deaeration
12.4.1 Wide fluctuations ........17 12.7.3 Incorrect connections ..........19 12.4.1.1 Check water inlet valve ......18 12.7.4 Mechanical failure ............ 19 12.4.1 2 Sudden slugs of water ......18 12.7.5 Short circuited windings .......... 19 12.4.1.3 Water flows ..........18 12.7.6 Overload .............. -
Page 5: Physical Laws
bicarbonates, which in the combined form, do not exist as gases. At any given pH value, the amounts of bicarbonate, versus free carbon dioxide present, form an equilibrium. When any two of the three mentioned parameters are known, (namely pH, quantity of bicarbonate, quantity of free carbon dioxide), the third may be calculated. -
Page 6: Mechanics Of Deaeration
pressure on the system. This can be accomplished by diluting the surrounding atmosphere with a scrubbing gas, thereby reducing the concentration of the dissolved 3.0 MECHANICS OF DEAERATION A number of studies indicate that to inhibit corrosion in a steam system, the oxygen content must be limited to a maximum level of .01 (.0075 cc/L). -
Page 7: Receiving / Inspection
this stage falls into the storage section where it is ready for use. It is now completely deaerated and heated to the steam temperature corresponding to the pressure within the vessel. A reduction in temperature and pressure in the vent condenser is created as the entering water condenses the steam atmosphere. -
Page 8: Installation
responsible for damages which occur in transit. Store the equipment in a clean, dry area. 5.1 INSTALLATION 5.1.1 Accessibility Entire systems should be positioned to permit access to operating controls, instruments, and inspection openings. Additional space should be allotted, if necessary, for platforms and ladders required for otherwise inaccessible areas. -
Page 9: Valve With Internal Float
accommodate average flow requirements, with the secondary unit contributing additional capacity to cover entire operating range of the system. 5.1.5.2 Valve with internal float Install rotary shaft packing box in opening indicated on drawing. Gaining access to the interior of the vessel through the manhole, securely attach float rod with float to the internal portion of the rotary shaft. -
Page 10: Steam
turbulence at separator inlet. Connect oil separator drain line to a trap or pipe loop seal. 5.2.6 Steam Steam is required to heat and deaerated water. Thermodynamic laws determine the quantity of steam necessary for deaeration. In order to accurately calculate the required steam it is necessary to set up a heat balance. -
Page 11: Accessories
Example: 50,000 # / hr. outlet capacity, inlet water entering at 60°F, deaerator operating at 5 psi; 5.2.6.2.2 If the operating pressure is between 1 and 5 psi, and if the inlet water temperature is between 100°F and 150°F, the steam required will be one tenth of the outlet flow: 5.2.6.2.3 Exact Method –... -
Page 12: Steam Velocity Chart
problem. -
Page 13: Example
EXAMPLE: Given a system with 50 psig steam pressure entering the pressure reducing valve, at a flow of 800 lbs. / hr. of steam and a reduced pressure of 5 psig, find the smallest sizes of upstream and downstream piping for reasonably quiet steam velocities. UPSTREAM PIPING: Enter the velocity chart at ‘A’... -
Page 14: Initial Start-Up, Hot (Steam Available)
necessary, but the float control should be checked for proper operation. Make any adjustments which may be required to maintain specified operating levels. 7.2.9 When a considerable volume of steam is issuing from the vent, throttle back the vent valve until only a plume of vapor can be seen. The water temperature at this point should rise to within three degrees of saturation temperature of the steam at the observed deaerator operating pressure. -
Page 15: Shut-Down
The vent valve opening should be adjusted accordingly until proper temperature is indicated. 8.0 SHUT-DOWN 8.1 Temporary (overnight, weekend, etc.) Recommended procedure is to allow deaerated water to remain in storage section while maintaining steam pressure in the vessel. Close water inlet and outlet valves. 8.2 Long Term Idle Periods The deaerator may be shut-down completely with no steam pressure in the unit. -
Page 16: After First Month Of Operation
11.1.2 After first month of operation Check spray valves for foreign matter, which may have accumulated from new piping. Clean if necessary. 11.1.3 Semi-Annually 11.1.3.1 Inspect spray valves and preheater section for scale or dirt (thin scale formations will not affect efficiency). Remove any accumulation of debris or scale if necessary. -
Page 17: Troubleshooting
12.0 TROUBLESHOOTING 12.1 Low Temperature The only reasons for a deaerator to operate at less than saturated steam temperature are lack of steam or improper venting: 12.1.1 Insufficient steam Insufficient steam may result from an undersized pressure reducing valve or an insufficient supply of steam due to other causes. - Page 18 12.4.1.1 Check water inlet valve Check water inlet valve for proper operation. Water supply pressures differing from those originally specified will result in inadequate or erratic supply. Remedy by using a properly sized valve or adjusted water supply pressure. 12.4.1 2 Sudden slugs of water Sudden slugs of water will cause severe variations in steam pressure.
- Page 19 from the water level to the pump suction centerline and converted to PSIG by dividing by 2.31. A slight variance may be observed due to friction losses in suction piping. Any restriction must be corrected immediately or severe pump damage will result. 12.5.2 Misaligned coupling Another source of noise would be a misaligned coupling between pump and motor.
- Page 20 12.7.8.3 Polyphase motor running single phase – Check for open circuit. 12.8 Controls 12.8.1 Blown Fuses 12.8.1.1 Short circuits Check motor for short-circuited windings – Reset and inspect pump and motor for proper operation. 12.8.1.2 Incorrect connections Refer to wiring diagram 12.8.1.3 Improper power supply Check voltage and motor nameplate requirements.