VA 33 63 00-2010 STEAM ENERGY DISTRIBUTION.pdf

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1、02-10 33 63 00 - 1 SECTION 33 63 00 STEAM ENERGY DISTRIBUTION SPEC WRITER NOTES: 1. Delete between /-/ if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. 2. References to pressure in this section are gage pressure unless o

2、therwise noted. 3. Include VA National CAD Standards as applicable to the project on the contract drawings: 02710-1.DWG Concrete Steam Manhole with Typical Piping. 15339-2.DWG Steam Trap Assembly and Steam Line Drip Pocket. 15339-4.DWG Steam Line Drip Trap Schedule. 15339-7.DWG High and Medium Press

3、ure Steam Trap Discharge into Pumped Condensate Return Line. 4. Refer to Appendices for site conditions that affect the choice of the type of underground system. PART 1 GENERAL: 1.1 DESCRIPTION: Underground steam distribution and condensate return piping system, including manholes. Type of system sh

4、all be: / walk-through concrete tunnels / concrete shallow trenches / pre-engineered direct-buried drainable-dryable-testable (DDT)/pre-engineered direct-buried water-spread-limiting (WSL) /. 1.2 DEFINITIONS: A. System: A complete underground steam and condensate distribution system including all co

5、mponents such as carrier piping, pipe supports, insulation, protective enclosures, anchors, corrosion protection and accessories. B. Pre-Engineered Direct-Buried System: System that is designed and factory-fabricated by a company specializing in these systems. The system includes pre-fabricated prot

6、ective enclosures and does not require a concrete trench or tunnel. The pre-engineered system shall include all piping and components to a point at least 150 mm (6 inches) inside the building and manhole walls. C. Drainable-Dryable-Testable (DDT) Pre-Engineered Direct-Buried System: A factory-fabric

7、ated system including an airtight and watertight outer protective casing, an insulated carrier pipe and an air space between the insulated carrier pipe and the casing. Drains and vents are provided in the ends of the system (in manholes or buildings). The drains allow Provided by IHSNot for ResaleNo

8、 reproduction or networking permitted without license from IHS-,-,-02-10 33 63 00 - 2 draining of ground water or condensate that may leak into the air space if there is a failure in the casing or the carrier pipe. The vents allow water vapor to escape and provide an indication of leakage. SPEC WRIT

9、ER NOTE: WSL systems are permitted only if the system design has successfully completed testing required by Unified Facilities Guide Spec (UFGS) 33 63 13, April 2006 or later, and the site is Class B, C or D (Appendix III). D. Water-Spread-Limiting (WSL) Pre-Engineered Direct-Buried System: A factor

10、y-fabricated system including an airtight and watertight outer protective casing and an insulated carrier pipe. It is fabricated in short sections (approximately 6 m (20 feet) long) which are independent from each other in that ground water or condensate which leaks from or into one section cannot t

11、ravel into the next section. Field-assembly of the sections requires no welding as the sections push together with a system of couplings and seals. Thermal expansion is absorbed in the clearance between carrier pipe ends in the couplings so that no expansion loops are required. E. Concrete Shallow T

12、rench: System with removable concrete covers located at grade. Carrier pipes are located within trench. Cross-section of trench is sufficient size only for piping, insulation, supports, air space and drainage. Designed by project engineer and field erected. Prefabricated concrete trench sections may

13、 be used. No equipment requiring access for operation or maintenance can be located in the trench because there is no access except by removing the heavy concrete covers. F. Walk-through Concrete Tunnels: System located below grade with sufficient space for carrier pipes, other services, and space t

14、o walk upright along the entire length of the system. Designed by project engineer and field erected. Prefabricated concrete tunnel sections may be used. G. Carrier Pipe: Pipe carrying the steam or condensate. H. Casing: Outer protective pipe on pre-engineered systems. Carrier pipe and insulation ar

15、e within the casing. The casing may also be referenced as the “conduit”. SPEC WRITER NOTE: Verify that the project drawings include the information listed below. I. Project Drawings: The “MS” project drawings accompanying this specification provide information on: 1. The size of carrier pipes, appro

16、ximate length, and site location of the system. 2. The elevation and routing of the piping on the site. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 33 63 00 - 3 3. Location and design of manholes and piping therein. 4. The obstacles located

17、 within approximately 25 m (8 feet) of the centerline of the system, including crossing utilities, that must be avoided or altered. 5. Type of system required - shallow concrete trench, walk-through tunnel, pre-engineered direct-buried. 6. Location of piping anchors. 7. Operating pressure and temper

18、ature of systems. 8. Details applicable to type of system specified. 9. Details of manhole and building entrances. 10. Other pertinent general information. J. Pressures: Pressures listed in this section are gage pressure unless otherwise noted. 1.3 RELATED WORK: A. Phasing of work: Section 01 00 00,

19、 GENERAL REQUIREMENTS. B. Excavation, shoring and backfill: Section 31 20 00, EARTH MOVING / Section 31 20 11, EARTH MOVING (SHORT FORM) /. C. Concrete work: Section 03 30 00, CAST-IN-PLACE CONCRETE. D. Waterproofing of concrete structures: / Section 07 12 00, BUILT-UP BITUMINOUS WATERPROOFING / Sec

20、tion 07 13 52, MODIFIED BITUMINOUS SHEET WATERPROOFING /. E. Asbestos removal work: Section 02 82 11, TRADITIONAL ASBESTOS ABATEMENT. F. Painting exposed steel and other surfaces: Section 09 91 00, PAINTING. G. Steel for trench and tunnel pipe supports: Section 05 50 00, METAL FABRICATIONS. H. Catho

21、dic Protection of DDT Pre-Engineered Direct-Buried Systems: Section 26 42 00, CATHODIC PROTECTION 1.4 QUALITY ASSURANCE: A. Approval by Contracting Officer is required of products or services of proposed manufacturers, suppliers and installers. B. For pre-engineered direct-buried systems, expansion

22、joints and ball joints, submit certification that: 1. Manufacturers regularly and currently manufacture the product. 2. There is a permanent service organization trained by the manufacturer that will provide the required field supervision of the installation of the system or equipment. Submit name a

23、nd address of the service organization. C. The manufacturer of pre-engineered direct-buried distribution system shall design the system to comply with the requirements of these specifications and is responsible for the complete product to be supplied, fabrication, witnessing installation and testing

24、 of the system. The complete design of Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 33 63 00 - 4 the system shall be prepared, signed and sealed by a Professional Engineer employed by the system manufacturer. D. Products Experience Record: 1

25、. Pre-Engineered Direct-Buried Systems: Shall be manufactured by a company which specializes in these systems and which has been in this business for five or more years. 2. All Other Products: The designs shall be of current production and have been in satisfactory operation on at least three instal

26、lations for approximately five years. E. Provide a complete installation with all necessary specialties, materials and equipment fully and properly connected and coordinated. Installation shall be fully operational upon completion of work defined and as phased. F. Apply and install systems, material

27、s, equipment and specialties in accordance with manufacturers instructions. Printed instructions shall be available at the site prior to and during construction. G. Materials, design, installation and workmanship shall conform to applicable local codes, and to national codes and standards as referen

28、ced in this specification. H. Manufactured Products: 1. When two or more items serve the same function, they shall be products of one manufacturer. 2. Manufacturers of assemblies of products, which include components made by others, shall assume complete responsibility for final assembled unit. a. A

29、ll components of an assembled unit need not be products of the same manufacturer. b. Constituent parts that are alike shall be products of a single manufacturer. c. Components shall be compatible with each other and with the total assembly for intended service. 3. All systems and equipment shall be

30、free from defects that would adversely affect the performance, maintainability, or appearance of individual components or overall assembly. 4. Each product shall be designed for the service conditions specified for that product. If no conditions are specified, the product shall be suitable for the a

31、ctual service conditions. I. Manufacturers Identification: Components of equipment shall bear manufacturers name or trademark and model number on a name plate securely affixed in a conspicuous place, or cast integral with, stamped or otherwise permanently marked upon the components of the equipment.

32、 Refer to Part 2 for requirements for pre-engineered direct-buried systems. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 33 63 00 - 5 J. Radiographic Testing of Welds: Weld examination methods and procedures and the interpretation of examini

33、ng films shall conform to ASME B31.1. The testing firm shall utilize the proper film exposure, techniques, and penetrameter to produce density and geometric sharpness required for first quality film, and all radiographs shall be reviewed and interpreted and reading reports signed by not less than an

34、 American Society for Non-Destructive Testing (ASNT) Certified Level III Radiographer. K. Cathodic Protection: Required on drainable-dryable-testable (DDT) pre-engineered direct buried systems. Refer to Section 26 42 00, CATHODIC PROTECTION. 1.5 SUBMITTALS: A. Submit in accordance with Section 01 33

35、 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES. B. Submit information and materials under this section separate from information and materials submitted under other sections and mark “SUBMITTED UNDER Section 33 63 00, STEAM ENERGY DISTRIBUTION, GROUP _.“ C. Submit all items listed under each group si

36、multaneously (except for items that can only be submitted during construction and upon completion of construction). 1. Group I, Pre-Engineered Direct-Buried Systems: a. Certification that system manufacturer regularly and currently manufactures direct-buried systems, and that the designs of the syst

37、em and equipment to be provided for this project conform to specification requirements. This certification shall be an original signed by a principal officer of the manufacturer. b. Complete descriptions and drawings of design of system and materials of construction including component parts, assemb

38、ly, carrier pipes, casing, anchors, pipe guides, pipe supports, expansion loops, manhole and building wall penetrations, end seals, leak plates, field installation instructions. c. Certification that water-spread-limiting (WSL) system (if submitted) has successfully passed the system test required b

39、y the Unified Facilities Guide Spec (UFGS) 33 63 13, EXTERIOR UNDERGROUND STEAM DISTRIBUTION SYSTEMS, April 2006 or later. d. Manufacturers data sheets on casing coatings. Provide test report that concludes that coating can withstand a minimum 96 hour test at 186 C (366 F) without disbonding from th

40、e steel jacket. e. A detailed design layout of the system showing the size, type, and location of each component, the design of anchors and manhole and Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 33 63 00 - 6 building wall penetrations, the

41、 design of the transition points to aboveground or other type systems. Also, if applicable, the type and details of the cathodic protection system including dielectric gaskets. f. Manufacturers quality assurance plan for fabrication, delivery, storage, installation and testing of system. g. Certific

42、ate of Qualification from system manufacturer that the manufacturers field representative regularly performs the specified duties of monitoring the installation of the system and is technically qualified and experienced in the installation of the system and is authorized by the supplier to make and

43、sign the daily reports specified herein. h. Manufacturers data sheets and thickness of carrier pipe insulation. i. Calculations approved and stamped by Professional Engineer demonstrating that allowable stress of piping will not be exceeded due to thermal expansion and that anchor forces and moments

44、 are not excessive. Calculations shall be performed by a finite-element, three dimensional analysis computer program. Final report shall show node stresses, forces, moments and displacements. j. Design life calculations for cathodic protection system. These shall be approved and stamped by NACE-qual

45、ified corrosion engineer. k. All drawings and calculations shall have Professional Engineers stamp. l. A proposed schedule of activities indicating when various items of work and tests are to be carried out and when quality control inspectors of the supplier will be present at the job site. m. The d

46、aily written report from the manufacturers representative at the job site during all stages of material delivery and construction. n. Proposed changes in design due to unforeseen conflicts or interferences along the route of the system. o. Upon completion of the work: 1) Certificate of Compliance si

47、gned by principal officers of the manufacturer and the contractor certifying that the system has been installed in accordance with contract requirements. 2) Operation and maintenance manual. 3) As-built layout of system including all final elevations (hard copies and AutoCAD on CD). 2. Group II, Pip

48、ing in Manholes, Concrete Tunnels, Concrete Shallow Trenches, Open Areas: a. Pipe, valves, strainers and fittings. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-02-10 33 63 00 - 7 b. Steam traps including orifice sizes, capacities. c. Pipe hangers,

49、 brackets, supports, racks, anchors, guides. d. Pipe hanger calculations. e. Pipe insulation, jackets, adhesives and cements. Submit samples and technical information. f. Layout drawings showing all piping, maintenance and operation access and sumps to scale. 3. Group III, Concrete Tunnels and Manholes: a. Tunnel and manhole plans, profiles, sections and details. b. Manhole frames, covers a