Division 23 Heating, Ventilation, And Air Conditioning

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Division 23 – Heating, Ventilation, and Air ConditioningTable of Contents23 00 0023 00 0123 00 0223 00 0323 00 0423 00 0523 00 0623 00 0723 00 0823 00 0923 00 1023 00 1123 00 1223 00 1323 00 1423 00 1523 00 1623 00 1723 00 1823 00 1923 00 2023 00 2123 00 2223 00 2323 00 2423 00 2523 00 2623 01 3023 01 6023 05 1323 05 1623 05 1923 05 2323 05 2923 05 5323 05 9323 06 0023 07 0023 07 1323 07 1623 07 1923 08 0023 09 0023 21 13HVACScopeProhibited ItemsCodesDesign Intent Report/Basis of DesignCoordination with University of Minnesota DepartmentAccess for MaintenanceMechanical SpecificationsMechanical DrawingsCoordination with Other TradesMaterials, Manufacturers, and SuppliersEquipment BasesPaintingExisting FacilitiesBuilding Service OutagesMechanical Equipment Rooms, Penthouse AccessOperating InstructionsEnergy InformationEnergy Conservation and SustainabilityIndustry StandardsWelding and BrazingElectrical RequirementsExcavation and Backfill for Underground Mechanical WorkEquipment IsolationEquipment and System CleaningBasic Tunnel RequirementsTunnel Communication Cable Installation – UTYOperation and Maintenance of HVAC Air DistributionOperation and Maintenance of Central Cooling EquipmentCommon Motor Requirements for HVAC EquipmentExpansion Fittings and Loops for HVAC EquipmentMeters and Gages for HVAC PipingGeneral-Duty Valves for HVAC PipingHangers and Supports for HVAC Piping and EquipmentIdentification of HVAC Piping and EquipmentTesting, Adjusting, and BalancingSchedules for HVACHVAC InsulationDuct InsulationEquipment InsulationPiping InsulationCommissioning of HVACInstrumentation and Controls for HVACHydronic Piping and Heating PipingDivision 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 20121 of 164

23 21 2323 22 0023 25 0023 30 0023 57 0023 60 0023 64 0023 65 0023 73 0023 74 0023 75 00Hydronic PumpsSteam and Condensate Piping and PumpsHVAC Water TreatmentHVAC Air DistributionHeat Exchangers for HVACCentral Cooling EquipmentPackaged Water ChillersCooling TowersIndoor5 Central-Station Air-Handling UnitsPackaged Outdoor HVAC Equipment-Rooftop Air ConditionersCompressed-Air SystemsDivision 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 20122

23 00 00 Heating, Ventilation and Air Conditioning (HVAC)23 00 01 General: The HVAC specifications shall be properly coordinated withDivision 01 00 00 - General Requirements and other divisions, and shallconform to the format and organizational requirements stated in theintroduction of these standards.23 00 02 Scope: This division covers the following mechanical systems:a. Heating, Ventilating, and air-conditioning (HVAC), including, all ducting, air handlingequipment, all supply, return, and exhaust fans, all heat recovery equipment and any other airflow equipment for buildings environmental controlsb. All HVAC equipment pipingc. All ventilation for research related equipmentd. All bio-tech related pipinge. Steam distribution and individual applicationsf. Chilled water and glycol distribution and individual applicationsg. Hydronic heating distribution and individual applicationsh. Compressed air generation and distribution for the laboratory applicationsi. All process piping for all research related equipmentj. All piping in utilities tunnels and shafts.k. All direct buried piping for all utilities, including the factory insulated steam and condensatepiping.l. 23 00 02 Prohibited materials and practices:Where applicable, individual sub sections include the prohibited materials and installationpractices.23 00 03 Codes: All work shall meet all applicable U of M, local, state and national codes andstandards.23 00 04 Design Intent Report/Basis of Design:Architect/Engineer (A/E) shall provide a design intent report at the preliminary design phase thatdocuments the following:a. Energy conservation measures and energy requirements for the proposedfacility.b. Noise criteriac. Choice of equipment with life cycle cost analysisd. Variances to the codes and standardse. B3, SB-2030 and/or LEED compliance measures when required.f. 50 year design considerations and its impact on mechanical equipmentselection. Most mechanical equipment has a 25 years life.g. Alternates and proposed value engineered construction materials andconstruction methods.23 00 05 Coordination with University of Minnesota departments.Division 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 20123

05.1. The architectural and engineering consulting firm (A/E) shall coordinate with the followingdepartments to ensure that the users needs are satisfied:1. Facilities Management (FM)2. Board of Regents3. U of M Building Code Office4. Capital Project Management (CPM)5. Office of Classroom Management (OCM)6. Department of Environmental Health and Safety (DEHS)7. Disability Services8. Facility Support9. Food Service10. Parking and Transportation Services (PTS)11. Central Security12. Office of Information Technology (OIT)13. University of Minnesota Policy Department (UMPD)14. Energy Management and University Planning15. Operations and Maintenance16. District officesThe A/E shall also coordinate with the University Utility Group to determine availability ofsteam, chilled water, compressed air, and 13.8 KV electrical feed for connection to campusutility systems.05.2. The architect shall work with the mechanical engineer to ensure that the equipmentinstallation meets the architectural requirements of the building. All mechanical equipment shallbe located inside the building except cooling towers and rooftop air handling equipment.05.3. Building air intakes shall be located a minimum of 30 feet above the grade or on the roof.On buildings less than three stories high, location on the roofs shall be allowed. All ground levelair intakes shall be reviewed and approved by the Facilities Management.23 00 06 Access for maintenance06.1. Location of equipment shall be determined by its service need, so it can be easilymaintained. In mechanical spaces, when the equipment is located 6 feet or higher above theground, a service platform shall be provided that complies withM N OSHA requirements for service and maintainability. The A/E shall provide sectionaldrawings of the mechanical rooms and shall meet with the district (Facilities Management) earlyin the design phase. For all equipment on flat and pitched roofs, access, safety and serviceplatforms shall be provided per MN OSHA and MN building codes.06.2. The A/E shall coordinate the mechanical design with other disciplines to provideadequately sized and properly located access panels.06.3. If below ground pits are required, these shall be minimum 6’x6’ with permanent ladders,gratings, and railings, a minimum 20 A GFI outlet, and a floor drain. These shall be reviewedwith the DEHS for the confined spaces and properly labeled.Division 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 20124

23 00 07 Mechanical Standards: Mechanical standards shall be properlycoordinated with the CSI sections of Section 01 00 00 - General Requirements and othersections, and shall conform to the format and organizational requirements stated in theIntroduction of this manual.23 00 08 Mechanical Drawings: Mechanical drawings shall be clearly delineated atappropriate scale to accurately define piping, ductwork and equipment. The A/E shall providecoordination drawings when necessary. These are different than the construction coordinationdrawings, normally in 3d format.23 00 09 Coordination with other trades09.1. Mechanical systems shall be coordinated with the building design and construction, as wellas with electrical, plumbing, fire protection, temperature controls, and other systems to eliminateconstruction conflicts.23 00 10 Materials, Manufacturers and Suppliers10.1. Whenever possible, equipment specified and provided shall be of a type and manufacturerthat has a local representative and a local replacement and service outlet to give completecoverage on parts and service at all times.10.2. All factory-assembled equipment shall incorporate materials and fabrication methodsconsistent with these standards and shall meet all MN codes including but limited to welding andpressure piping.23 00 11 Equipment Bases: Concrete bases with a 4-inch minimum height shall beprovided under all floor-mounted mechanical equipment. The concrete base height shall beadequate to accommodate condensate ‘P’ traps and proper condensate flow. Base size andlocation shall be coordinated with the equipment specified and shall be shown on thearchitectural and structural drawings. Mechanical equipment shall be installed using vibrationisolators. The vibration isolators shall be per equipment manufacturer’s recommendations. Noisolation to the floor is needed for slab on grade.Concrete bases for equipment requiring isolation pads shall be designed, reviewed and approvedby the final user of the equipment.23 00 12 Painting12.1. All piping, ducts, radiation, grills, diffusers and other equipment that is exposed in finishedand unfinished spaces shall be painted in accordance with Division 09 91 00 under finishes.12.2. Painting of exposed piping, ducts and other equipment in the equipment spaces, tunnels,crawl spaces, shafts, and other unfinished spaces shall be included in the mechanicalspecifications. See Division 09 91 00 under finishes.23 00 13 Existing Facilities: For remodeling projects, the University of Minnesota shallDivision 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 20125

provide openings in walls and ceilings where required and where the A/E requests to permitverification of existing piping, ductwork and equipment.23 00 14 Building Service Outages: The A/E shall coordinate this requirement with thePreconstruction Meeting Agenda form located in the Forms Section.14.1. Service Outage Request: The contractor shall request all building service outages throughthe Project Manager. All outages shall be accommodated Monday thru Thursday unlessotherwise requested by the Project Manager. The contractor shall give 2 week notice to theProject Manager for any planned service outages.14.2. Impairment Procedures: Request for impairments of fire protection system or fire alarmsystem requires a 24-hour notice. Refer to Division 21 00 00 - Fire Protection Systems andDivision 21 30 00 - Fire Pumps for specific impairment procedures.14.3. Fire Safety Precautions14.3.1. The A/E shall include the following statement in the specifications with regard toprotective measures for the contractor during grinding, cutting, brazing, sweating orwelding operations. All grinding, cutting, brazing, sweating or welding operations carried onin the vicinity of, or accessible to combustible material, shall be adequatelyprotected to make certain that a spark or hot slag does not reach the combustiblematerial and start a fire. When it is necessary to do grinding, cutting, brazing, sweating or weldingclose to wood construction in pipe shafts or other locations where combustiblematerials cannot be removed or adequately protected, employ fireproof blankets andproper fire extinguishers. A helper shall be stationed nearby to guard against sparksand fire. Whenever combustible material has been exposed to molten metal or hotslag from welding or cutting operations or spatter from electric arc, a fireguard shallbe kept at the place of the work for at least one hour after completion to make surethat smoldering fires do not start. When welding or cutting in a vertical pipe shaft or floor opening, afireguard shall examine all floors below the welding or cutting operation. Thefireguard shall be kept on duty for at least one hour after completion of work toguard against fires. Before grinding, cutting, brazing, sweating or welding, consult with theA/E as to particular safety precautions. In the case of a remodeling project in an existing building or connection ofa new building to an existing building, the A/E also shall include in theDivision 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 20126

specifications all the mandatory requirements described in the Standard OperatingProcedures for Hot Works form located in the Forms Section.23 00 15 Mechanical Equipment Rooms, Penthouse Access15.1. All equipment rooms shall be properly ventilated to maintain proper operating temperaturesas required by the proper equipment operation.15.2. Mechanical equipment shall be located, sized and arranged in a space that provides easyaccess for maintenance, repair and future replacement. The equipment also shall be enclosed toseparate it from other building functions.15.3. Where heat-generating equipment is situated adjacent to or above occupied spaces, theequipment shall be ventilated. In addition, the floors, walls and ceilings shall be insulated withpermanently attached, durable, and fire-resistant insulation to provide a “U” (overall heat transfercoefficient) value through the wall or ceiling not to exceed 0.15 BTU/hr. sq. ft. F. Theinsulating materials shall be reviewed and approved by the U of M designated representative.15.4. Adequate provisions shall be made in mechanical space to support equipment, piping andductwork.15.5. Equipment, piping and ductwork in such rooms shall be mounted or suspended in a mannerthat will isolate it from the system and from the structure to prevent noise and vibrations inadjacent spaces.15.6. No mechanical equipment of any type shall be placed in building areaways or tunnelswithout prior approval from the appropriate parties. No piping shall run into or through fresh airplenums and/or air ducts.23 00 16 Operating Instructions16.1. Complete temperature control drawings and operations sequence shall be mounted in aconspicuous location on or immediately adjacent to major equipment such as air handlers andconverters.16.2. Refer to Division 01 00 00 - General Requirements, Section 01 70 00 - Contract Closeoutfor additional information on equipment maintenance and operations manuals.16.3. Specifications shall clearly define the responsibilities of the contractor and themanufacturers to provide instruction to designated university personnel in the proper operationand maintenance of all mechanical equipment provided. The schedule for the training shall becoordinated with the Project Manager and the commissioning agent as appropriate.23 00 17 Energy Information17.1. The Uof M operates its own central steam, chilled water, central compressed air, andprimary electric distribution systems. For utility services to new buildings or existing buildingsDivision 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 20127

being remodeled, contact the University Energy Management Utility section for information onutility services availability and installation requirements to connect to the central systems.17.2. Specification for new university buildings shall include a section that identifies the peakand monthly energy and utility requirements of the buildings. The requirements shall includeelectrical, chilled water, gas, steam, compressed air, and water services. Provide both design loadand estimated load.17.2.1. ElectricityA. Design Load: kWh/month for a 12-month periodB. Design Demand: Peak kW/month for a 12-month periodC. Estimated Load Profile: kWh/month for a 12-month periodD. Estimated Demand: Peak kW/month for a 12-month period17.2.2. Chilled WaterA. Design Load: Tons of cooling required/chiller size recommendedB. Installed Capacity: Chiller size in tons if a stand alone chiller is required.C. Design cooling load calculations in tons on a design dayD. Estimated Load Profile: Ton hours/month for a 12-month period17.2.3. GasA. Estimated Load Profile: Therms/month for a 12-month periodB. Design Demand: Peak usage, cubic ft./hr. on a design day17.2.4. SteamA. Estimated Load Profile: Steam pounds per month for a 12-month periodB. Design Demand: Peak steam demand in pounds per hour on a design day17.2.5. WaterA. Estimated Load Profile: Water gallons per month for a 12-month periodB. Design Demand: Gallons/hour maximum17.2.6 Compressed AirA. Estimated use in SCFMB. Designed load in SCFM23 00 18 Energy Conservation and SustainabilityRefer to the Sustainable Design Standards section (General Information) for energy conservation designrequirements.Division 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 20128

23 00 19 Industry StandardsIn addition to the requirements of the regulatory agencies listed in Division 01 00 00 - GeneralRequirements, Division 01 41 13 - Building Code Regulatory Requirements, the design and constructionshall conform to the latest edition of the following standards where applicable:a. American Concrete Instituteb. American Conference of Governmental Industrial Hygienistsc. American Institute of Steel Constructiond. American Society of Heating, Refrigeration and Air Conditioning Engineeringe. American Society of Mechanical Engineersf. American Society for Testing Materialsg. American Water Works Associationh. American Welding Societyi. ANSI Code for Power Piping B31.1j. Associated Air Balance Councilk. Hydraulic Institute Standards for Centrifugal, Rotary and Reciprocating Pumpsl. Institute of Electrical and Electronic Engineersm. National Association of Sheet Metal and Air Conditioning Contractorsn. National Board of Boiler and Pressure Vessel Inspectorso. National Bureau of Standardsp. National Commercial and Industrial Insulation standardsq. National Environmental Balancing Bureaur. National Fire Protection Associations. National Safety Code for Mechanical Refrigerationt. International Institute of Ammonia Refrigerationu. ASME BioProcessing Equipment and Piping23 00 20 Welding and Brazing20.1. Certified and licensed trades persons shall perform all mechanical welding and brazing.Certification shall be for the type of work being performed and shall be accomplished inaccordance with the “Qualification Standard for Welding Procedure, Welders and WeldingOperators" as specified by ASME or appropriate governing agency for brazing.20.2. An independent testing laboratory shall radiograph selected joints, which shall be evaluatedon the basis of API and ANSI construction standards appropriate for the service. The A/E shallidentify the standard applicable for each welded system.20.3. Steam condensate piping trades persons shall follow procedures identified in the ProcedureQualification Record and Welding Procedure Specifications in these standards.20.4 All underground and in tunnels steam and condensate piping welding joints shall be 100%radiographed.23 00 21 Electrical RequirementsDivision 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 20129

21.1. The A/E shall supplement specifications with the necessary control diagrams formechanical equipment. The diagrams shall clearly define the sequence of operation, as well asthe responsibilities of mechanical and electrical subcontractors.21.2. To ensure that the temperature control system is complete, control wiring for automatictemperature control systems and other special systems as noted shall be specified in this division.21.3 All motor starters and disconnects and other electrical components that are not integral partof the shipped equipment shall be installed and wired by the electrical trade.23 00 22 Excavation and Backfill for Underground Mechanical Work22.1. The requirements specified in Division 31 - Earth Work shall be applicable to this work,including protecting, sheathing and shoring, blasting, compaction filling, compaction testing andgrading.22.2. Fill at manholes shall be placed in 6-inch lifts and compacted to the standards specified inDivision 31 - Earth Work.23 00 23 Equipment Isolation23.1. The specifications shall include isolation valves. All equipment must be installed withisolation valves for shutoff service. The valves must have flanged or screwed ends. If screwed,provide a union between equipment and valve.23.2. All systems such as potable water, heating systems and cooling systems must have aminimum of one isolation valve per building level.23 00 24 Equipment and System Cleaning24.1. The specifications shall include system-cleaning requirements. After hydrostatic tests andprior to operating tests, equipment, including and not necessarily limited to the chiller, coolingtower, boilers, heat exchangers and all piping shall be thoroughly flushed and cleaned.24.2. All piping systems, including open and closed loops, shall be cleaned and disinfectedbefore they become operational. Exception: Sanitary and storm sewers are not required to bedisinfected. The A/E shall specify that cleaning and disinfecting the system be done by theuniversity water treatment supplier.Coordination of the activity with the District is required. Disinfecting shall be done to meet theminimum requirements that DEHS defines.24.3. After the solution has cleaned the system, the solution shall be drained and thoroughlyflushed with fresh water from the system. After initial cleaning, the Project Manager or designeeshall sign and certify that the system has been thoroughly cleaned. Any cleaning water thatcannot be drained to the city sewer system shall be removed from the site by the contractor.23 00 25 Basic tunnel requirements.Division 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 201210

General: These services and equipment are provided by appropriate contractors.25.1. Lighting must be equivalent to equipment rooms. Two-lamp fluorescent, surface-mounted,low profile fixtures that are free from sharp edges are preferred. Pay careful attention to locationto ensure that lighting fixtures do not pose a hazard for head injuries.25.2. Four-way convenience outlets shall be no farther than 100 feet apart.25.3. Welding outlets that match existing standard welding outlets shall be no farther than 200feet apart.25.4. Provide ventilation. Fresh air sources shall be controlled with manual dampers.25.5. Surface and groundwater must be drained to the nearest storm sewer. Drainage pipes andtrenches must be designed so that trash, sand, mineral deposits and other debris can be easilyremoved.25.6. Secure all access points by padlock or key lock or electronic card entry. Full-sized doorsrequire panic hardware. Dampers may be provided on doors for ventilation.25.7. Designers shall contact University Energy Management Utility Section personnel regardingspecific design requirements for equipment that detects intrusion into tunnels and steam systemsensors.23 00 26 Tunnel Communication Cable Installation.1. General: This section covers standards for planning and installing all communication cable in thesteam tunnels on the Minneapolis and St. Paul campuses. This standard covers cable installations by anyuniversity department and outside contractors. These services and equipment are provided byappropriate contractors.2. Planning2.1. New cable installations shall go through a planning stage. The installingdepartment/contractor shall show the locations of all new cable on a scalable drawing. Drawingsshall be submitted to the building code official's office and University Energy Management forapproval prior to installation. Drawings shall be submitted at least two weeks before the plannedstart of construction. Drawings shall include sections that detail precisely where the cable is to berouted. Drawings shall clearly point out locations where headroom or other safety compromisescannot be avoided.2.2. Because there are numerous existing tunnels with varying needs for cable installation, it isimpractical to create details on standard installation layout. Where there is doubt, contactUniversity Energy Management for the best routes for new cable installation.Division 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 201211

3. Installation3.1. The Building Officials Office and University Energy Management shall approve thedrawings before cable installation.3.2. Cable installation shall be done in as safe and professional manner as possible.3.3. New installation shall not create unnecessary safety hazards.3.4. Headroom shall be maintained at all times in all locations.3.5. Install cables where they will not interfere with existing mechanical equipment, existinglighting and electrical power equipment, ladders and tunnel carts.3.6. Cable installation shall be free of sharp edges.3.7. Remove unused cable at the earliest possible time.3.8. Place tags with installation date and responsible party on the cable every 200 feet and atevery juncture and turn.23 01 30 Operation and Maintenance of HVAC Air Distribution30.51 HVAC Duct CleaningWhen duct cleaning is necessary, refer to Appendix II - HVAC System Decontamination: DuctCleaning.For all new construction, all HVAC ducts shall be cleaned prior to thecommissioning of HVAC equipment and acceptance of the mechanical work.For all remodeling, all ductwork shall be cleaned as required and as directed bythe A/E and the District’s personnel.23 01 60 Operation and Maintenance of Central Cooling Equipment60.71 Refrigerant Recovery/RecyclingFor all new and remodeling work, special attention shall be provided to eliminate any leaks andaccidental discharge of any refrigerant to the atmosphere. All refrigerants shall be recovered andrecycled per local and national standards and codes. The recovered refrigerant are the propertyof the U of M. These shall be saved or discarded by the contractor as directed by the U of Mauthorized personnel.23 05 13 Common Motor Requirements for HVAC EquipmentDesign ‘E’ motors are prohibitedDivision 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 201212

All electrical motors up to and including 0.5 HP shall be 115-1-60. All motors above 0.5 HPshall be 460-3-60 or 208-3-60. All three phase motors shall be dual voltage; 208/230 and 460volts.All electrical motors shall be of high efficiency, 1.1 service factor.All motors located inside the air handling equipment shall be TEFC.All motors located in the ambient shall be protected from rainAll motors shall meet the minimum requirements of all applicable Energy codes,and standards.23 05 16 Expansion Fittings and Loops for HVAC Equipment1. Wherever practical, show details for properly designed expansion loops or piping offsets tocompensate for thermal expansion in the piping system. A structural engineer shall designanchors and guides for expansion loops and joints as required. Show details for the anchors andguides on the drawings. A structural registered engineer’s signed design calculations shall besubmitted for review.2. Expansion compensators in hot water systems shall be Flexonics Model H or the U of Mapproved equal. The compensators shall incorporate guides and anchors.3. Where loops cannot be used, the following expansion joints shall be specified:3.1. Low Pressure Steam Lines (15 psig and less)3.1.1. Expansion joints shall be the packed slip tube-type that allows foradditional packing to be injected under full system pressure.3.1.2. Expansion joints shall be designed for steam at a maximum workingpressure of 150 psig and a maximum temperature of 350 degrees F. The steamsystem, for which the expansion joints will be installed, shall be designed to 15psig with 100 degree F superheat.3.1.3. Expansion joints shall be either the single-slip design that is furnished withor without an anchor base or double-slip design that is furnished with an anchorbase. The ends of the slip shall be ANSI Class 150 raised face forged steelflanges. The stuffing box shall have integral internal and external guide surfaces,and be furnished with low friction, non-metallic guide inserts.3.1.4. The total traverse of an expansion joint shall be a minimum of 1 inchgreater than the nominal traverse. All expansion joints shall be shipped with aminimum of 1-inch pre-compression to allow for 1-inch extension and thenominal traverse in compression.3.1.5. Specify Advanced Thermal Systems Inc. or the U of M approved equal.3.2. High Pressure Steam Lines (greater than 15 psig)Division 23 - Heating, Ventilation and Air ConditioningUniversity of Minnesota Standards and Procedures for DesignDecember 201213

3.2.1. High-pressure steam lines greater than 15 psi: All expansion joints shall beANSI Class 300 #, steel body, lubricated slip joint type, internally/externallyguided with weld ends. Specify Yarway Gun-Pakt or university-approved equal.3.2.2. Expansion joints shall be the packed slip tube-type that allows foradditional packing to be injected under full system pressure.3.2.3. Expansion joints shall be designed for steam at a maximum workingpressure of 300 psig and a maximum temperature of 506 degrees F. The steamsystem, for which the expansion joints shall be installed, shall be designed to 250psig with 100 degree F superheat.3.2.4. Expansion joints shall be either single-slip design that is furnished with orwithout an anchor base or double-slip design that is furnished with an anchorbase. The ends of the slip shall be ANSI Class 300 raised face forged steelflanges. The stuffing box shall have integral internal and external guide surfacesand be furnished with low-friction, non-metallic guide inserts.3.2.5. The total traverse of an expansion joint shall be a minimum of 1 inchgreater than the nominal traverse. All expans