1、*USACE / NAVFAC / AFCESA / NASA UFGS-23 22 13.35 40 (February 2011)-Preparing Activity: NASA SupersedingUFGS-23 22 13.35 (May 2010)UNIFIED FACILITIES GUIDE SPECIFICATIONSReferences are in agreement with UMRL dated October 2011*SECTION TABLE OF CONTENTSDIVISION 23 - HEATING, VENTILATING, AND AIR COND
2、ITIONINGSECTION 23 22 13.35 40STEAM TRAPS02/11PART 1 GENERAL1.1 REFERENCES1.2 GENERAL REQUIREMENTS1.3 SUBMITTALSPART 2 PRODUCTS2.1 MATERIALS2.2 TRAP APPLICATION2.3 TRAP-SIZING CRITERIA2.4 TRAP TYPE, CONSTRUCTION, AND MATERIALS2.4.1 Type IB2.4.2 Type F R 2006) Standard Specification for Gray Iron Cas
3、tings for Pressure-Containing Parts for Temperatures Up to 650 degrees F (350 degrees C)1.2 GENERAL REQUIREMENTS*NOTE: If Section 23 00 00 AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEMS is not included in the project specification, applicable requirements therefrom should be inserted and
4、 the following paragraph deleted.*Section 23 00 00 AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEMS applies to work specified in this section.Submit manufacturers catalog data for steam traps in accordance with referenced standards contained in this section.Submit installation drawings for
5、 steam traps in accordance with the manufacturers published instructions.Submit listing of product installation for steam traps, indicating at least five_ installed units, similar to those proposed for use, that have been in successful service for a minimum of five_ years.1.3 SUBMITTALS*NOTE: Review
6、 Submittal Description (SD) definitions in Section 01 33 00 SUBMITTAL PROCEDURES and edit SECTION 23 22 13.35 40 Page 3Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-the following list to reflect only the submittals required for the project. Submitt
7、als should be kept to the minimum required for adequate quality control.A “G” following a submittal item indicates that the submittal requires Government approval. Some submittals are already marked with a “G”. Only delete an existing “G” if the submittal item is not complex and can be reviewed thro
8、ugh the Contractors Quality Control system. Only add a “G” if the submittal is sufficiently important or complex in context of the project.For submittals requiring Government approval on Army projects, a code of up to three characters within the submittal tags may be used following the “G“ designati
9、on to indicate the approving authority. Codes for Army projects using the Resident Management System (RMS) are: “AE“ for Architect-Engineer; “DO“ for District Office (Engineering Division or other organization in the District Office); “AO“ for Area Office; “RO“ for Resident Office; and “PO“ for Proj
10、ect Office. Codes following the “G“ typically are not used for Navy, Air Force, and NASA projects.Choose the first bracketed item for Navy, Air Force and NASA projects, or choose the second bracketed item for Army projects.*Government approval is required for submittals with a “G“ designation; submi
11、ttals not having a “G“ designation are for Contractor Quality Control approval.for information only. When used, a designation following the “G“ designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROC
12、EDURES:SD-03 Product DataManufacturers Catalog Data; G; G, _SD-02 Shop DrawingsInstallation Drawings; G; G, _SD-07 CertificatesListing of Product Installation; G; G, _Steam Traps; G; G, _Trap Bodies and Components; G; G, _PART 2 PRODUCTS2.1 MATERIALSEnsure that traps exposed to weather are freezepro
13、of.SECTION 23 22 13.35 40 Page 4Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Submit certificates for steam traps and trap bodies and components showing conformance with the referenced standards contained in this section.2.2 TRAP APPLICATIONSERVICE
14、 TRAP TYPESteam mains, risers, Type IB, inverted bucket withbranches thermostatic air vent wherenecessarySteam mains, risers, and Refer to drawingsbranches, weather-exposedand subject to freezingSteam coils associated with Type F&T, float and thermo-fans staticSteam coils not associated Type T, ther
15、mostaticwith fans and notsubject to freezingHot-water converter Type F&T, float and thermo-staticFlash tank Type IB, inverted bucket2.3 TRAP-SIZING CRITERIASize traps in steam mains, risers, and branches to provide an actual capacity, under normal operating conditions, of not less than three times t
16、he normal condensing rate.Size traps draining underground steam mains to provide an actual capacity, under normal operating conditions, of not less than four times the normal condensing rate.Size traps in steam mains, risers, and branches, weather-exposed and subject to freezing, to provide an actua
17、l capacity, under normal operating conditions, of two times normal condensing rate and duplex. Provide two identical traps, sized appropriately at each drainage point.Size traps draining steam coils under modulating control to provide an actual capacity, under conditions normal to the system and inc
18、luding 3.5 kilopascal 1/2-pound per square inch (psi) coil pressure, of two times normal condensing rate and capable of opening at maximum coil steam pressure.Size traps in all other services to provide an actual capacity, under normal operating conditions, of three times normal condensing rate.Trap
19、 safety factors are minimal. Increase safety factor where necessary to ensure proper system drainage for a given application. Do not decrease without written approval.2.4 TRAP TYPE, CONSTRUCTION, AND MATERIALSProvide trap bodies and components with a primary working steam pressure SECTION 23 22 13.3
20、5 40 Page 5Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-(wsp)-rating equal to or in excess of the maximum wsp of the steam system to which they are applied.Provide cast iron trap bodies for pressures 860 kilopascal 125-psi wsp and under in accorda
21、nce with ASTM A278/A278M, Class 30.Provide welded end connection trap bodies of cast steel in accordance with ASTM A216/A216M, Grade WCB forged carbon steel in accordance with ASTM A105/A105M.Ensure traps have permanent external identification of service indicating rating and orifice size.2.4.1 Type
22、 IB*NOTE: Select applicable type of trap and delete those not used in project.*Provide inverted bucket traps with AISI 300 Series corrosion-resistant steel floats and operating mechanisms, and hardened 13 percent chrome corrosion-resistant steel seats and valves.Provide bimetallic type thermostatic
23、elements.Design traps to permit removal and replacement of all operating and wearing parts without disturbing piping connections to trap body.Provide strainers as an integral part of the body.Provide bodies with plugged priming and draining openings.Provide test cocks.2.4.2 Type F&TProvide float and
24、 thermostatic traps with AISI 300 series corrosion-resistant steel, heliarc-welded floats and operating mechanisms, and hardened 13 percent chrome corrosion-resistant steel seats and valves.Balance thermostatic elements, pressure type, with corrosion-resistant alloy bellows charged with a fluid that
25、 provides the most rapid response to changes in temperature.Make bellows suitable for service with condensate having a pH of 6.0.Design traps to permit removal and replacement of all operating and wearing parts without disturbing piping connections to trap body.Design bellows to permit removal while
26、 hot without overexpansion and shield from direct blast of steam and condensate.Fit bodies with drain plug.2.4.3 Type TBalance thermostatic traps, pressure type, with corrosion-resistant alloy bellows charged with a fluid that provides the most rapid response to SECTION 23 22 13.35 40 Page 6Provided
27、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-change in temperature.Make bellows suitable for service with a condensate having a pH of 6.0. Shield bellows from direct blast of steam and condensate and design to permit removal while hot without overexpansio
28、n.Provide hardened valves and valve seats made of 13 percent chrome corrosion-resistant steel.Design traps to permit removal and replacement of all operating and wearing parts without disturbing piping connections.PART 3 EXECUTION3.1 TRAP INSTALLATIONInstall traps in accordance with the manufacturers instructions.3.2 COMPONENT INSTALLATIONInstall trap components in accordance with the manufacturers instructions.- End of Section -SECTION 23 22 13.35 40 Page 7Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
