VA 23 52 33-2011 WATER-TUBE BOILERS.pdf

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1、05-11 23 52 33 - 1 SECTION 23 52 33 WATER-TUBE BOILERS SPEC WRITER NOTES: 1. Delete between / - / if not applicable to project. Also delete any other item or paragraph not applicable in the Section. Deleted paragraphs should be labeled as “Omitted”. 2. References to pressure in this section are gage

2、 pressure unless otherwise noted. 3. Two types of water tube boilers are specified, flex tube and D-type. 4. Flex tube boilers: 1) Primarily for non-critical service firing gas fuel and with stable steam demands. Expected life is 15 20 years. 2) In addition to natural gas, only No.2 fuel oil should

3、be fired and in limited quantity because of the difficulty of cleaning soot from the tubes. 3) Because of the relatively small diameter of the steam drum, steam quality may be unsatisfactory and carryover may occur if there are rapid and substantial fluctuations in steam demands. Three-element water

4、 level control is advisable. 4) Mechanical cleaning of the tube interiors is not possible. Chemical cleaning is necessary. 5) Acceptable manufacturers are Bryan and Unilux. Maximum boiler horsepower of Bryan boilers is 527. Unilux has larger boilers. 5. D-type two pass water tube boilers: 1) D-type

5、boilers are recommended for critical industrial and institutional service where longevity and reliability are essential. Expected life is 40 years. 2) Various fuels, including heavy oil, can be burned satisfactorily. 3) Applications are typically for steam loads approximately 25,000 lb/hr and above.

6、 This type is available for lower loads, but it is much more expensive and less efficient than the fire tube type which should be utilized for the lower steam demands. 4) The pressure vessel interior and furnace are relatively easy to inspect. Tubes can be cleaned mechanically. Provided by IHSNot fo

7、r ResaleNo reproduction or networking permitted without license from IHS-,-,-05-11 23 52 33 - 2 6. Contract drawings must include (as applicable) the VA National CAD Standards listed below: SD235233-01 Water Tube Boiler SD235233-02 Access Platform Arrangement For Water Tube Boiler SD232111-07 Boiler

8、 Feedwater Pumps Flow Diagram SD232111-08 Boiler Flow Diagram PART 1 - GENERAL 1.1 DESCRIPTION: This section specifies packaged water tube boiler with trim (accessories), dual fuel (natural gas and fuel oil) burner, fuel trains /, and flue gas economizer/. 1.2 RELATED WORK: A. Section 09 91 00, PAIN

9、TING. /B. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS./ C. Section 23 05 11, COMMON WORK RESULTS FOR HVAC and STEAM GENERATION. D. Section 23 05 51, NOISE and VIBRATION CONTROL FOR BOILER PLANT. E. Section 23 21 11, BOILER PLANT PIPING SYSTEMS: Valves for boiler tr

10、im, non-return stop-check valve, piping for fuel and feedwater trains. F. Section 23 51 00, BREECHINGS, CHIMNEYS, and STACKS: Boiler outlet damper systems, breechings, stacks, flue gas recirculation (FGR) ductwork. G. Section 23 09 11, INSTRUMENTATION and CONTROL FOR BOILER PLANT: Burner controls, c

11、ombustion control system, boiler water level control, pressure gages, thermometers. H. Section 23 08 11, DEMONSTRATIONS and TESTS FOR BOILER PLANT. I. Section 23 08 00 COMMISSIONING OF HVAC SYSTEMS: Requirements for commissioning, systems readiness checklists, and training. 1.3 QUALITY ASSURANCE: A.

12、 Coordinate all new and existing equipment and conditions. This includes, but is not limited to: boiler, boiler trim, burner, fuel trains, gas pressure regulators and available gas pressure, fuel oil header back pressure regulator on house oil pump set and available fuel oil pressure, burner control

13、 system, combustion control system, economizer (if provided), breeching and stacks. B. Provide written certification that the entire assembly has been coordinated to achieve the required performance and to provide the required features. C. The model and size of the proposed burner shall have been pr

14、eviously applied to at least three boilers that are similar in size, proportion, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-05-11 23 52 33 - 3 and arrangement to the proposed boiler. In each of the three installations, burner performance shall h

15、ave conformed to requirements listed in Part 2, BURNER and FUEL TRAINS. Provide list of these installations, and name, address and telephone number of person familiar with each project who will serve as a reference source. D. Regardless of fuel input rating, the equipment, installation and operation

16、 shall conform to NFPA 85. Where conflicts exist between NFPA 85 and this specification, this specification will govern. 1.4 SUBMITTALS: A. Before executing any work, submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES. B. Boiler: 1. Complete catalog information and

17、outline drawing of boiler and accessories with dimensions. 2. Arrangement and description of construction of pressure parts, casings, drum internals, drum handhole covers and yokes, and support frame. 3. Drum piping connection sizes, locations, construction. 4. Technical data including temperature r

18、atings and arrangement of refractory and insulation. 5. Steam nozzle construction. Capability of steam nozzle and attachment to steam drum to withstand forces and moments imposed by connecting piping. Refer to table of forces and moments on the drawings. 6. Amount of heating surface, combustion volu

19、me. 7. Weight of boiler and burner assembly, empty and flooded. 8. Design pressures and temperatures. 9. Loading diagram of support frame. Evidence that boiler support requirements have been coordinated with foundation design. 10. Recommended anchorage of boiler support frame to foundation. 11. Furn

20、ace viewport construction, locations. 12. Dimensioned location of normal water line, lowest and highest permissible water level, set points of water level alarms and cutoffs. 13. Predicted surface temperature at front, rear and sides of boiler. SPEC WRITER NOTE: Delete the following subparagraph if

21、not required. 14. Seismic design data on boiler and anchorage of boiler to foundation. Refer to Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-05-11 23 52 33 - 4 C. Boil

22、er Trim: Includes bottom blowoff valves, water column with conductivity probe assembly, water level gage with illuminator, auxiliary low water cutoff, piping, all valves and fittings furnished by boiler manufacturer, feedwater control valve, safety valves, steam pressure gage, steam pressure switche

23、s. 1. Design, construction, arrangement on the boiler. 2. Pressure and temperature limitations. 3. ASTM numbers and schedule numbers of piping. 4. Type and pressure ratings of pipe fittings. 5. Flow and pressure drop data on feedwater control valve. 6. Scale ranges of gages, thermometers, and pressu

24、re switches. 7. Location of water level sensing and indicating devices in relation to normal water line of boiler and highest and lowest permissible water lines of boiler. 8. Set pressure and capacity of safety valves. D. Burner and Fuel Trains: 1. Catalog data and drawings showing construction of b

25、urner parts and assembly of complete system. 2. Drawings, with dimensions, showing burner over all size and mounting on the boiler. 3. Catalog data and outline drawings of forced draft fan, flue gas recirculation ductwork (if provided), dampers, motors and sound attenuators on fan intake or discharg

26、e. 4. Drawings showing assembly of throat refractory into furnace refractory wall. 5. Type and temperature rating of throat refractory. 6. Drawings and catalog data on all equipment in igniter (pilot) train, main fuel trains, atomizing media train. Include data on pressure and temperature ratings, f

27、low vs. pressure drop, performance characteristics, and inspection agency approvals. Complete data on oil atomization air compressor systems with sound attenuators. 7. ASTM number and schedule numbers on all piping. 8. Type and pressure ratings of pipe fittings. 9. Burner flow and pressure data: a.

28、Main burner fuel and atomizing media pressures and flows at maximum required firing rate. b. Igniter (pilot) fuel flow and burner pressure. c. Natural gas main fuel pressure at outlet of burner-mounted pressure regulator. d. Igniter fuel pressures (natural gas and LP gas) at outlet of burner-mounted

29、 pressure regulators. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-05-11 23 52 33 - 5 e. Forced draft fan static pressure, power and air flow at maximum firing rate. Amount of flue gas recirculation. 10. Full load efficiency and power factor of al

30、l motors. 11. Predicted sound level at maximum firing rate. 12. Weight of burner assembly. 13. Drawings showing location and arrangement of drive units and jackshaft system (if provided) for controlling fuel and air flow. 14. Weight of burner assembly. E. Burner Management (Flame Safeguard) Control

31、System: Refer to Section 23 09 11, INSTRUMENTATION and CONTROL FOR BOILER PLANT. /F. Flue Gas Economizer: 1. Drawings showing arrangement and dimensions of unit and all accessories. 2. Design and construction of unit and accessories including soot blowers, safety relief valve. 3. Weight of entire un

32、it, empty and flooded. 4. Pressure and temperature limitations of unit and accessories. 5. Performance data on safety relief valve. 6. Drawing showing tube arrangement, clearance for tube removal (rectangular units) and soot blower nozzle locations. Written recommendations of soot blower manufacture

33、r on number of elements and locations of nozzles for this economizer design and size. 7. Manufacturers operating recommendations for mounting and support requirements for economizer (weight-flooded)./ SPEC WRITER NOTE: Delete the following Subparagraph if not applicable. /G. Seismic data. Refer to S

34、ection 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL COMPONENTS./ H. Boiler and Burner Predicted Performance Data, for Each Fuel, Site Altitude: 1. At Maximum Required Output With and Without Economizer (If Applicable) In Service, at 15 Percent Excess Air: Fuel and steam flow, boiler f

35、lue gas outlet temperature, economizer (if provided) flue gas outlet temperature, steam quality, boiler efficiency, windbox and furnace pressures, predicted boiler radiation and unaccounted losses, feedwater and flue gas pressure losses in the economizer (if provided). 2. At Low Fire, 25%, 50% and 7

36、5% of Maximum Firing Rate: Percent excess air, carbon monoxide (CO) ppm and NOx ppm. I. ASME “P” Forms, Manufacturers Data Report, on boiler and economizer construction. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-05-11 23 52 33 - 6 J. Pretest Da

37、ta - Boiler, Burner, Controls: As required by Part 3. K. Final Test Report - Boiler, Burner, Controls: As required by Part 3. L. Completed System Readiness Checklists provided by the Commissioning Agent and completed by the contractor, signed by a qualified technician and dated on the date of comple

38、tion, in accordance with the requirements of Section 23 08 00 COMMISSIONING OF HVAC SYSTEMS. 1.5 PROJECT CONDITIONS: A. Fuels to be Fired, Main Burner: / Natural gas / No. 2 fuel oil / No. 5 fuel oil / No. 6 fuel oil /. B. Igniter (Pilot) Fuels: Natural Gas and LP gas (propane). C. Natural Gas: High

39、 heating value is reported as _MJ per cubic meter (_ Btu per cubic foot) at gas company base pressure and temperature. Pressure provided to the inlet of the boiler-mounted regulators will be _kPa (_psi) as maintained by the main gas regulator station. D. Fuel Oil: Will be furnished under Government

40、contract. / No. 5 / No. 6 / fuel oil will be heated to _degrees C (_degrees F). House pumping system is designed to provide _kPa (_psi) nominal to the fuel train entrance on each burner fuel train. Pressure will vary in accordance with characteristics of backpressure regulator on house oil pump set.

41、 Refer to Section 23 50 11, BOILER PLANT MECHANICAL EQUIPMENT. Oil grade (No. 2) refers to ASTM D396. E. Low Pressure Air Atomizing Burners: Each burner must include a dedicated air compressor system furnished by burner manufacturer. /F. Oil Atomizing Media: 1. Steam Atomizing Burners: Steam pressur

42、e range at inlet to atomizing train _ to _ kPa (_ to _ psi). When plant is cold (steam not available), compressed air (0.8 standard cubic meters per minute at 550 kPa) (30 SCFM at 80 psi) is available (from plant compressor) as an alternate for starting any boiler and continuously operating it at a

43、required steam output of 13 percent of full load. 2. Low Pressure Air Atomizing Burners: May be furnished at the option of the Contractor. Each burner must include a dedicated air compressor system furnished by burner manufacturer./ G. LP Gas (Propane): Furnished to the Government for igniter (pilot

44、) fuel by a local supplier. Regulators at tank areas will be set at 35 kPa (5 psi). Serves as igniter fuel when there is an interruption to the natural gas supply. 1.6 APPLICABLE PUBLICATIONS A. The publications listed below form a part of this specification to the extent referenced. The publication

45、s are referenced in the text by basic designation only. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-05-11 23 52 33 - 7 B. ASTM International (ASTM): A106/A106M-08 Standard Specification for Seamless Carbon Steel Pipe for High Temperature Service.

46、 A178/178M-02(2007) . Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes A269-10 Standard Specification for Seamless and Austenitic Welded Stainless Steel Tubing for General Service C612-10 Standard Specification for Mineral Fib

47、er Block and Board Thermal Insulation D396-09a . Standard Specification for Fuel Oils C. American Society of Mechanical Engineers (ASME): Boiler and Pressure Vessel Code - 2007 Edition with Amendments. Section I Power Boilers Section II . Material Section VII Recommended Rules for Care of Power Boil

48、ers Section IX . Welding and Brazing Qualifications Performance Test Code (PTC): PTC 4-2008 . Fired Steam Generators Code for Pressure Piping: B31.1-2007 . Power Piping D. National Fire Protection Association (NFPA): 70-2008 National Electric Code 85-2007 Boiler and Combustion Systems Hazards Code E

49、. National Board of Boiler and Pressure Vessel Inspectors (NBPVI): NB-232007 National Board Inspection Code F. Fluid Controls Institute (FCI): 70-2-2006 Control Valve Seat Leakage G. Department of Health and Human Services, Food and Drug Administration (FDA): CFR 21, 173.310, . Boiler Water Additives Permitted in Plants Where Steam Contacts Food H. Enviro