USACE / NAVFAC / AFCESA / NASA UFGS-23 22 13.35 (August 2008) ------------------------------- Preparing Activity: NASA Superseding UFGS-23 22 13.35 40 (June 2006) UNIFIED FACILITIES GUIDE SPECIFICATIONS References are in agreement with UMRL dated January 2009 SECTION 23 22 13.35 STEAM TRAPS 08/08 NOTE: This specification covers the requirements for steam traps. Drawings shall schedule the normal condensing rate for the service. Equipment and capacity safety factor shall be as specified hereinafter. Drawings shall number each trap sequentially with the prefix ST. Thermodynamic traps are not acceptable due to pressure limitations. Edit this guide specification for project specific requirements by adding, deleting, or revising text. For bracketed items, choose applicable items(s) or insert appropriate information. Remove information and requirements not required in respective project, whether or not brackets are present. Comments and suggestions on this guide specification are welcome and should be directed to the technical proponent of the specification. A listing of technical proponents, including their organization designation and telephone number, is on the Internet. Recommended changes to a UFGS should be submitted as a Criteria Change Request (CCR). PART 1 GENERAL 1.1 REFERENCES NOTE: This paragraph is used to list the publications cited in the text of the guide specification. The publications are referred to in the text by basic designation only and listed in this paragraph by organization, designation, date, and title. Use the Reference Wizard's Check Reference feature when you add a RID outside of the Section's Reference Article to automatically place the reference in the Reference Article. Also use the Reference Wizard's Check Reference feature to update the issue dates. References not used in the text will automatically be deleted from this section of the project specification when you choose to reconcile references in the publish print process. The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only. ASTM INTERNATIONAL (ASTM)ASTM A 105/A 105M(2005) Standard Specification for Carbon Steel Forgings for Piping ApplicationsASTM A 216/A 216M(2008) Standard Specification for Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature ServiceASTM A 278/A 278M(2001; R 2006) Standard Specification for Gray Iron Castings 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 the following paragraph deleted. Section 23 00 00 AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEMS applies to work specified in this section. Submit _{Manufacturer's Catalog Data} for steam traps in accordance with referenced standards contained in this section. Ensure that _{Installation Drawings} for steam traps are in accordance with the manufacturer's 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 Submittal Description (SD) definitions in Section 01 33 00 SUBMITTAL PROCEDURES and edit the following list to reflect only the submittals required for the project. Submittals 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 through the Contractor’s 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" designation 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 Project 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; submittals 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 PROCEDURES: _{SD-03 Product Data} Submit _{Manufacturer's Catalog Data} for steam traps in accordance with paragraph entitled, "General Requirements," of this section. _{SD-02 Shop Drawings} Submit _{Installation Drawings} for steam traps in accordance with paragraph entitled, "General Requirements," of this section. _{SD-07 Certificates} Submit _{Listing of Product Installation} for steam trap assemblies in accordance with paragraph entitled, "General Requirements," of this section. Submit certificates for the following in accordance with paragraph entitled, "Materials," of this section. _{Steam Traps Trap Bodies and Components} PART 2 PRODUCTS 2.1 MATERIALS Ensure that traps exposed to weather are freezeproof. Submit certificates for _{Steam Traps} and _{Trap Bodies and Components} showing conformance with the referenced standards contained in this section. 2.2 TRAP APPLICATION                 SERVICE                            TRAP TYPE             Steam mains, risers,          Type IB, inverted bucket with             branches                      thermostatic air vent where                                           necessary             Steam mains, risers, and      Refer to drawings             branches, weather-exposed             and subject to freezing             Steam coils associated with   Type F&T, float and thermo-             fans                          static             Steam coils not associated    Type T, thermostatic             with fans and not             subject to freezing             Hot-water converter           Type F&T, float and thermo-                                           static             Flash tank                    Type IB, inverted bucket 2.3 TRAP-SIZING CRITERIA Size traps in steam mains, risers, and branches to provide an actual capacity, under normal operating conditions, of not less than three times the 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 actual 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 including 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 safety factors are minimal and shall be increased where necessary to ensure proper system drainage for a given application but not be decreased without written approval. 2.4 TRAP TYPE, CONSTRUCTION, AND MATERIALS Trap bodies and components shall have a primary working steam pressure (wsp)-rating equal to or in excess of the maximum wsp of the steam system to which applied. Trap bodies for pressures 860 kilopascal 125-psi wsp and under shall be cast iron in accordance with ASTM A 278/A 278M , Class 30. Welded end connection trap bodies shall be [cast steel in accordance with ASTM A 216/A 216M, Grade WCB] [forged carbon steel in accordance with ASTM A 105/A 105M]. Traps shall have permanent external identification of service rating and orifice size. 2.4.1 Type IB Inverted bucket traps shall have AISI 300 Series corrosion-resistant steel floats and operating mechanisms and hardened, 13 percent chrome corrosion-resistant steel seats and valves. Thermostatic elements shall be bimetallic type. 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&T Float and thermostatic traps shall have 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 will provide 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 hot without overexpansion and shield from direct blast of steam and condensate. Fit bodies with drain plug. 2.4.3 Type T Balance thermostatic traps, pressure type, with corrosion-resistant alloy bellows charged with a fluid that will provide most rapid response to 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 overexpansion. Harden valves and valve seats, 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 EXECUTION 3.1 TRAP INSTALLATION Install traps in accordance with the manufacturer's instructions. 3.2 COMPONENT INSTALLATION Install trap components in accordance with the manufacturer's instructions.