23 70 03.pdf

Tinker AFB, OK TAFB Technical Specifications 2019

April 2019 Page 1 Section 23 70 03

SECTION 23 70 03

HEATING AND UTILITIES SYSTEMS, CENTRAL STEAM

PART 1 GENERAL

If the steam is required exclusively either for heating or for utilities, the specification will be revised by the deletion of requirements which are inapplicable to the system required for the project.

a. Steam heating systems: Steam heating systems shall operate at a pressure of approximately 5 psig. The steam shall be supplied from a central steam plant and shall be reduced to the specified gauge pressure.

(1) Vacuum-return system: Condensate from the heating system shall be returned by vacuum to the vacuum pumping unit which will pump the condensate back to the central steam plant.

(2) Gravity-return system: Condensate from the heating system shall be returned by gravity to a condensate pumping unit which will pump the condensate back to the central steam plant.

b. Steam utility systems: Steam utility systems shall be of the two-pipe gravity-return type with steam supplied from a central plant at a gauge pressure of approximately 100 psig and reduced to a gauge pressure of approximately 40 psig. The steam shall be supplied to steam-using equipment without further reduction in pressure and the condensate shall return through medium-pressure traps, flash tanks, and a condensate pumping unit to the central system.

1.1 REFERENCES

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. Current editions of references at time of delivery order shall be used.

AIR-CONDITIONING, HEATING AND REFRIGERATION INSTITUTE (AHRI)

ANSI/AHRI 850 Performance Rating of Commercial and

Industrial Air Filter Equipment

AMERICAN WATER WORKS ASSOCIATION (AWWA)

AWWA C606 Grooved and Shouldered Joints

AMERICAN WELDING SOCIETY (AWS)

AWS A5.8/A5.8M Specification for Filler Metals for Brazing and Braze Welding

AWS D1.1/D1.1M Structural Welding Code - Steel

April 2019 Page 2 Section 23 70 03

ASME INTERNATIONAL (ASME)

ASME B1.20.1 Pipe Threads, General Purpose (Inch)

ASME B16.1 Gray Iron Pipe Flanges and Flanged Fittings

Classes 25, 125, and 250

ASME B16.15 Cast Bronze Alloy Threaded Fittings Classes

125 and 250

ASME B16.18 Cast Copper Alloy Solder Joint Pressure

Fittings

ASME B16.21 Nonmetallic Flat Gaskets for Pipe Flanges

ASME B16.3 Malleable Iron Threaded Fittings, Classes 150 and 300

ASME B16.39 Standard for Malleable Iron Threaded Pipe

Unions; Classes 150, 250, and 300

ASME B16.4 Standard for Gray Iron Threaded Fittings;

Classes 125 and 250

ASME B16.5 Pipe Flanges and Flanged Fittings: NPS 1/2

Through NPS 24 Metric/Inch Standard

ASME B16.9 Standard for Factory-Made Wrought Steel

Buttwelding Fittings

ASME B31.1 Power Piping

ASME B40.100 Pressure Gauges and Gauge Attachments

ASME BPVC SEC IX BPVC Section IX-Welding and Brazing

Qualifications

ASME BPVC SEC VIII D1 BPVC Section VIII-Rules for Construction of

Pressure Vessels Division 1

ASME PTC 19.3 Temperature Measurement

ASTM INTERNATIONAL (ASTM)

ASTM A106/A106M Standard Specification for Seamless Carbon

Steel Pipe for High-Temperature Service

ASTM A181/A181M Standard Specification for Carbon Steel

Forgings, for General-Purpose Piping

ASTM A183 Standard Specification for Carbon Steel Track

Bolts and Nuts

ASTM A504/A504M Standard Specification for Wrought Carbon

Steel Wheels

April 2019 Page 3 Section 23 70 03

ASTM A53/A53M Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A536 Standard Specification for Ductile Iron

Castings

ASTM A653/A653M Standard Specification for Steel Sheet, Zinc-

Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM A659/A659M Standard Specification for Commercial Steel

(CS), Sheet and Strip, Carbon (0.16 Maximum to 0.25 Maximum Percent), Hot-Rolled

ASTM A733 Standard Specification for Welded and

Seamless Carbon Steel and Austenitic Stainless Steel Pipe Nipples

ASTM B251 General Requirements for Wrought Seamless

Copper and Copper-Alloy Tube

ASTM B32 Standard Specification for Solder Metal

ASTM B88 Standard Specification for Seamless Copper

Water Tube

ASTM B88M Standard Specification for Seamless Copper

Water Tube (Metric)

ASTM C700 Standard Specification for Vitrified Clay

Pipe, Extra Strength, Standard Strength, and Perforated

ASTM D1248 Standard Specification for Polyethylene

Plastics Extrusion Materials for Wire and Cable

ASTM D1693 Standard Test Method for Environmental

Stress-Cracking of Ethylene Plastics

ASTM D2000 Standard Classification System for Rubber

Products in Automotive Applications

ASTM D3308 PTFE Resin Skived Tape

ASTM D635 Standard Test Method for Rate of Burning and/or Extent and Time of Burning of Self- Supporting Plastics in a Horizontal Position

COMPRESSED AIR AND GAS INSTITUTE (CAGI)

CAGI B19.1 Safety Standard for Compressor Systems

April 2019 Page 4 Section 23 70 03

EXPANSION JOINT MANUFACTURERS ASSOCIATION (EJMA)

EJMA Stds EJMA Standards

MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS

INDUSTRY (MSS)

MSS SP-25 Standard Marking System for Valves, Fittings, Flanges and Unions

MSS SP-58 Pipe Hangers and Supports - Materials, Design and Manufacture, Selection, Application, and Installation

MSS SP-69 Pipe Hangers and Supports - Selection and

Application (ANSI Approved American National Standard)

MSS SP-70 Gray Iron Gate Valves, Flanged and Threaded

Ends

MSS SP-71 Gray Iron Swing Check Valves, Flanged and

Threaded Ends

MSS SP-80 Bronze Gate, Globe, Angle and Check Valves

MSS SP-85 Gray Iron Globe & Angle Valves Flanged and

Threaded Ends

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA MG 1 Motors and Generators

PLUMBING-HEATING-COOLING CONTRACTORS NATIONAL ASSOCIATION (PHCC)

NAPHCC NSPC National Standard Plumbing Code

UNDERWRITERS LABORATORIES (UL)

UL 94 Standard for Tests for Flammability of

Plastic Materials for Parts in Devices and Appliances

1.2 SUBMITTALS

Government approval is required for submittals. S ubmit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Heating and Utilities System

Detail drawings consisting of schedules, performance charts, brochures, diagrams, drawings, and instructions necessary for installation of the systems as specified. Detail drawings for pumping units and appurtenances, including controls. Drawings

April 2019 Page 5 Section 23 70 03 shall indicate clearances required for maintenance and operation and shall also contain complete wiring and schematic diagrams, equipment layout and anchorage, and any other details required to demonstrate that the system has been coordinated and will properly function as a unit.

Drawings Installation Pipe Anchors

Detailed drawings of pipe anchors, before installation.

SD-03 Product Data

Welding

A copy of qualified procedures and a list of names and identification symbols of qualified welders and welding operators.

System Equipment Framed Instructions

Proposed diagrams, instructions, and other sheets, before posting.

SD-06 Test Reports

Adjusting, Balancing, Testing and Inspecting

Test reports in booklet form showing all field tests performed to adjust each component and all field tests performed to prove compliance with the specified performance criteria, upon completing and testing the system. Each test report shall indicate the final position of controls.

SD-10 Operation and Maintenance Data

Operating and Maintenance Instructions

Heating and Utilities System

Six complete copies of operation manuals outlining the step-by-step procedures required for system startup, operation, and shutdown.

The manuals shall include the manufacturer's name, model number, service manual, parts list, and a brief description of all equipment and their basic operating features. Six complete copies of maintenance manuals listing routine maintenance procedures, possible breakdowns and repairs, and troubleshooting guides. The manuals shall include piping layout, equipment layout, and simplified wiring and control diagrams of the system as installed.

April 2019 Page 6 Section 23 70 03

1.3 QUALITY ASSURANCE

1.3.1 Welding

Submit a copy of qualified procedures and a list of names and identification symbols of qualified welders and welding operators. Piping shall be welded in accordance with qualified procedures using performance-qualified welders and welding operators. Procedures and welders shall be qualified in accordance with ASME BPVC SEC IX. Welding procedures qualified by others, and welders and welding operators qualified by another employer may be accepted as permitted by ASME B31.1. The Contracting Officer shall be notified 24 hours in advance of tests and the tests shall be performed at the work site if practical. The welder or welding operator shall apply his assigned symbol near each weld he makes as a permanent record. Structural members shall be welded in accordance with Section 05 05 23 WELDING, STRUCTURAL. Welding and nondestructive testing procedures are specified in Section 40 05 13.96 WELDING PROCESS PIPING.

1.3.2 Use of Asbestos Products

Products which contain asbestos are prohibited. This prohibition includes items such as packings or gaskets, even though the item is encapsulated or the asbestos fibers are impregnated with binder material.

1.4 DELIVERY, STORAGE, AND HANDLING

Protect all equipment delivered and placed in storage from weather, humidity and temperature variations, dirt and dust, or other contaminants.

PART 2 PRODUCTS

2.1 MATERIALS AND EQUIPMENT

2.1.1 Standard Products

Provide materials and equipment which are the standard products of a manufacturer regularly engaged in the manufacture of the products and that essentially duplicate items that have been in satisfactory use for at least 2 years prior to bid opening. Equipment shall be supported by a service organization that is, in the opinion of the Contracting Officer, reasonably convenient to the site.

2.1.2 Nameplates

Each major item of equipment shall have the manufacturer's name, address, type or style, model or serial number, and catalog number on a plate secured to the item of equipment.

2.1.3 Prevention of Rust

Unless otherwise specified, surfaces of ferrous metal subject to corrosion shall be factory prime painted with a rust inhibiting coating and subsequently factory finish painted in accordance with the manufacturer's standard practice. Equipment exposed to high temperature when in service shall be prime and finish painted with the manufacturer's standard heat resistant paint to a minimum thickness of 1 mil.

file://tss-414srv-1/tss_dfs1/Spec_LIB/Saber_2012/05%2005%2023.doc

April 2019 Page 7 Section 23 70 03

2.1.4 Equipment Guards and Access

Fully enclose or guard belts, pulleys, chains, gears, couplings, projecting setscrews, keys, and other rotating parts exposed to personnel contact.

High temperature equipment and piping exposed to contact by personnel or where a fire hazard will be created shall be properly guarded or covered with insulation of a type specified. Provide items such as catwalks, operating platforms, ladders, and guardrails where shown and construct them in accordance with Section 05 50 13 MISCELLANEOUS METAL FABRICATIONS.

2.2 MATERIALS

Submit spare parts data for each item of equipment provided, after approval of the drawings and not later than 2 months before the date of beneficial occupancy. Include in the data a complete list of spare parts and supplies, with current unit prices and supply sources. Materials shall conform to the following:

2.2.1 Filters

ANSI/AHRI 850.

2.2.2 Iron and Steel Sheets

2.2.2.1 Galvanized Iron and Steel

ASTM A659/A659M, ASTM A653/A653M with general requirements conforming to ASTM A504/A504M. Gauge numbers specified refer to manufacturer's standard gauge.

2.2.2.2 Uncoated (Black) Steel

Composition, condition, and finish best suited to the intended use. Gauge numbers specified refer to manufacturer's standard gauge.

2.2.3 Pipe and Pipe Fittings

2.2.3.1 Adapters

Adapters for copper tubing shall be brass or bronze for soldered fittings.

2.2.3.2 Cast Iron Pipe Fittings

ASME B16.1 or ASME B16.4, Class 125, type to match adjacent piping.

2.2.3.3 Clay Sewer Pipe

ASTM C700, Class 1, Type I, Style a.

2.2.3.4 Copper Tubing

ASTM B88, ASTM B88M, Type K or L. For compressed air tubing, ASTM B251.

file://tss-414srv-1/tss_dfs1/Spec_LIB/Saber_2012/05%2050%2013.doc

April 2019 Page 8 Section 23 70 03

2.2.3.5 Fittings for Brass or Copper Pipe

ASME B16.15, Class A or B.

2.2.3.6 Fittings for Copper Tubing

Cast or wrought bronze or wrought copper, soldered-joint, brazed-joint, or flared-joint type, as specified, completely fabricated at the factory.

Bronze threaded fittings shall conform to the applicable requirements of ASME B16.15. Cast copper alloy solder joint pressure fittings shall conform to ASME B16.18. Fittings on Type L tubing shall be brazed-joint type of cast or wrought bronze or wrought copper. Fittings on Type K tubing shall be cast bronze flared joint type. Brass or bronze adapters for brazed tubing may be used for connecting tubing to flanges and to threaded ends of valves and equipment. Extracted brazed tee joints produced with an acceptable tool and installed as recommended by the manufacturer may be used. Grooved mechanical joints and fittings shall be designed for not less than 125 psig service and shall be the product of the same manufacturer.

Grooved fitting and mechanical coupling housing shall be ductile iron conforming to ASTM A536. Gaskets for use in grooved joints shall be molded synthetic polymer of pressure responsive design and shall conform to ASTM D2000 for circulating medium up to 230 degrees F. Grooved joints shall conform to AWWA C606. Coupling nuts and bolts for use in grooved joints shall be steel and shall conform to ASTM A183.

2.2.3.7 Malleable Iron Pipe Fittings

ASME B16.3, type required to match adjacent piping.

2.2.3.8 Nipples

ASTM A733, standard weight.

2.2.3.9 Pipe

ASTM A53/A53M or ASTM A106/A106M, Grade A or B, black steel. Pipe shall be standard weight unless otherwise specified.

2.2.3.10 Welding Fittings for Pipe

ASME B16.9.

2.2.3.11 Pipe Flanges and Flanged Fittings

Steel flanges, ASTM A181/A181M and ASME B16.5. Convoluted flanges shall mate with ASME B16.5, Class 150 flanges. Flanges and fittings shall have the manufacturer's trademark affixed in accordance with MSS SP-25 so as to permanently identify the manufacturer.

2.2.3.12 Pipe Hangers, Inserts, and Supports

MSS SP-58 and MSS SP-69.

2.2.3.13 Pipe Threads

ASME B1.20.1.

April 2019 Page 9 Section 23 70 03

2.2.3.14 Solder, Silver

AWS A5.8/A5.8M, or the solder metal shall conform to ASTM B32 95-5 tin antimony.

2.2.3.15 Unions

ASME B16.39, type to match adjacent piping.

2.2.3.16 Gaskets

ASME B16.21. Approved metallic self-centering style and ring style gasket consisting of metallic retainer and sealing gland may be used for intended service.

2.2.4 Polyethylene Tubing

Low-density virgin polyethylene conforming to ASTM D1248, Type I, Category 5, Class B or C.

2.2.5 Valves

2.2.5.1 Check Valves

a. Sizes 3 inches and less, bronze: MSS SP-80, Type 3 or 4, Class 125.

b. Sizes 2 inches through 24 inches, cast iron: MSS SP-71, Type III or IV, Class 125.

2.2.5.2 Globe Valves

a. Sizes 3 inches and less, bronze: MSS SP-80, Type 1, 2, and 3, Class 125.

b. Sizes 2 inches through 12 inches, cast iron: MSS SP-85, Type III, Class 125.

2.2.5.3 Angle Valves

a. Sizes 3 inches and less, bronze: MSS SP-80, Type 1, 2, or 3, Class 125.

b. Sizes 2 inches through 12 inches, cast iron: MSS SP-85, Type IV, Class 125.

2.2.5.4 Gate Valves

a. Sizes 3 inches and less, bronze: MSS SP-80, Type 1 or 2, Class 125.

b. Sizes 2 inches through 48 inches, cast iron: MSS SP-70, Type I, Class 125, Design OT or OF (OS & Y), bronze trim.

April 2019 Page 10 Section 23 70 03

2.2.5.5 Radiator Valves

Quick-opening disk type, angle-patterned, and constructed of brass. Valves shall be provided with union radiator connections, spring-retained packing, and composition mushroom handles.

2.2.6 Electrical Motors

Motors shall be as specified in Section 26 20 00 INTERIOR DISTRIBUTION

SYSTEM.

2.3 ELECTRICAL WORK

Provide electrical motor driven equipment specified complete with motors, motor starters, and controls. Electrical equipment and wiring shall be in accordance with Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM. Electrical characteristics shall be as specified or indicated. Integral size motors shall be the premium efficiency type in accordance with NEMA MG 1. Provide motor starters complete with thermal overload protection and other appurtenances necessary for the motor control specified. Each motor shall be of sufficient size to drive the equipment at the specified capacity without exceeding the nameplate rating of the motor. Manual or automatic control and protective or signal devices required for the operation specified, and any control wiring required for controls and devices but not shown, shall be provided.

2.4 SYSTEM EQUIPMENT

2.4.1 Condensate Pumping Unit

The number of pumps and the type of unit required for the condensate pumping unit will vary depending on application and system. Inapplicable requirements may be deleted. If a vertical-type unit is specified, the motor may be mounted on the receiving tank top. Indicate size and location of vent pipe. If a condensate pumping unit is not required for the project, delete this paragraph. Requirements relative to the capacity of the condensate pumping unit will be supplied in brackets as follows.

Minimum capacity for condensate pumps and receivers:

Pump capacity, Capacity receiving Tank EDR sq.ft. gpm gallons

1,000 1.5 20 2,000 3.0 20 4,000 6.0 30 6,000 9.0 45 8,000 12.0 60 10,000 15.0 75 15,000 22.5 115 20,000 30.0 150 25,000 37.5 190 30,000 45.0 225 40,000 60.0 300 50,000 75.0 375 75,000 112.5 570

April 2019 Page 11 Section 23 70 03

Each pump shall have a minimum capacity of application required gpm when discharging against the specified pressure. Minimum capacity of the tank shall be as required. Condensate pumping unit shall be of the single or duplex, horizontal-shaft or vertical-shaft type. Unit shall consist of one or two pumps, one electric motor or two electric motors, and a single receiver. Pump shall be centrifugal or turbine type, bronze-fitted throughout, with impellers of bronze or other corrosion-resistant metal.

Pumps shall be free from air-binding when handling condensate up to 200 degrees F. Pumps shall be connected directly to drip-proof enclosed motors.

Receiver shall be cast iron and shall be provided with condensate return, vent, overflow, and pump suction connections, water level indicator and automatic air vent. Strainer shall be provided in the inlet line to tank.

Vent pipe shall be galvanized steel, and the fittings shall be galvanized malleable iron. Vent pipe shall be installed as indicated. Vent piping shall be flashed as specified. Pump, motor, and receiving tank may be mounted on a single base with the receiver pipe to the pump suction. A gate valve and check valve shall be provided in the discharge connection from each pump. Enclosed float switches complete with float mechanism shall be installed in the head of the receiver. Each condensate pump shall be controlled automatically by means of the respective float switch that will automatically start or stop the motor when the water in the receiver reaches the high or low level respectively. Motors shall be provided with magnetic across-the-line starters equipped with general purpose enclosure and "Automatic-Manual-Off" selector switch in the cover. Automatic alternator shall be provided for duplex units.

2.4.2 Vacuum Pumping Unit

Vacuum pumping unit shall consist of a single pump, motor, and receiving tank, pumps, motors, and other functioning parts in duplicate, and a single receiving tank, as indicated. Unit shall be arranged for automatic operation. Each pump shall be suitable for the number of square feet of equivalent direct radiation (EDR) and the discharge pressure indicated.

Receiver shall be a two-compartment type, constructed of close-grained cast iron with multijet vacuum producers. Pumping unit shall be close coupled vertical design, bronze-fitted with stainless steel shafts, enclosed bronze impeller, renewable bronze case ring, and mechanical shaft seal. Equipment, including pumps, motors, and receiver shall preferably be mounted on a single base. Accessories shall consist of a compound gauge, inlet strainer, thermometer, water level gauge with stopcocks, adjustable vacuum relief valve, air and condensate discharge check valves, and companion flanges for all flanged connections. Pump discharge line shall be provided with a check valve and globe valve.

2.4.2.1 Capacity

Minimum capacity, water only, of the pumping unit shall be required gpm, at 160 degrees F with 5-1/2 inch heating vacuum and the required discharge pressure. Minimum capacity of the pumping unit shall be required gallons of water and required cfm of air with simultaneous pumping of both water and air and with a 5-1/2 inch vacuum at 160 degrees F. Condensate receiver shall have a capacity, between float-switch start and stop, of not less than the application required gallons.

April 2019 Page 12 Section 23 70 03

2.4.2.2 Motor and Controls

Each pump shall be driven by a sleeve- or ball-bearing motor of such size that the brake horsepower required by the pumping unit under the specified rated capacities shall not exceed the nameplate rating of motor. Motor shall be drip-proof type, and shall conform to the requirement specified in Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM. Fully automatic controls shall be provided for each pump motor, consisting of a float in the receiving tank, a float switch, an adjustable vacuum switch, an automatic across-the-line magnetic starter providing thermal-overload protection, and a Float and Vacuum (fully automatic control) Float Only-Continuous-Off selector switch.

2.4.3 Space Temperature Controls

The space temperature controls shown will be reviewed and the inappropriate paragraphs will be deleted. Delete air dryer and standby compressor when not required.

Space temperature control system shall be pneumatic (replacement only), electric, or electronic. Control wiring and tubing required to complete the space temperature control system shall be included.

2.4.3.1 Air Compressor

Where pneumatic controls are furnished, an air compressor of the standard piston type shall be provided complete with air tanks, air dryer, and other appurtenances. Compressor and installation shall comply with CAGI B19.1.

Compressor shall be of sufficient capacity to provide continuous control air when operating on a 1/3-on 2/3-off cycle and shall be provided with a visible oil-level sight glass and oil filter. Air dryers shall be of the silicagel type with reactivation, or of the refrigerated type, and shall maintain the air in the system with a dew point low enough to prevent condensation (minus 13 degrees F at 18 psi main pressure). Air dryer shall be located at the outlet of the tank. A standby compressor of capacity equal to the basic compressor shall be provided with interlocked control system to provide automatic changeover upon the malfunction or failure of basic compressor. A manual selector switch shall be provided to index the lead compressor including the automatic changeover.

2.4.3.2 Air Lines

Air lines for pneumatic controls shall be seamless copper tubing or nonmetallic tubing. Piping shall be concealed except in mechanical rooms or areas where other piping is exposed. Copper tubing shall be hard-drawn in exposed areas and either hard-drawn or annealed in concealed intervals and shall run parallel to the lines of the building. Only tool-made bends will be acceptable. Fittings for copper tubing shall be brass or copper solder joint-type except at connections to apparatus, where fittings shall be brass compression-type. Nonmetallic tubing shall be polyethylene, meeting the stress crack test of ASTM D1693. Individual tube polyethylene or multitube instrument tubing bundle shall be classified as flame retardant under UL 94 and the polyethylene material shall be rated as self-extinguishing when tested in accordance with ASTM D635. Nonmetallic tubing shall be run within securely supported rigid metallic raceway or electric metallic tubing except as indicated. Single nonmetallic tubing in a protective sheath may be used

April 2019 Page 13 Section 23 70 03 above accessible ceilings and in other concealed accessible locations.

Tubing concealed in walls containing insulation, fill, or other packing materials shall be hard-drawn copper tubing or nonmetallic tubing run in conduit. Terminal single lines shall be hard-drawn copper tubing, except if the run is less than 12 inches, flexible polyethylene may be used.

Nonmetallic tubing shall not be used for applications where the tubing could be subjected to a temperature exceeding 130 degrees F. Multitube instrument bundle may be used in place of single tube where a number of tubes run to the same points. Tubing shall be periodically tested for leaks during installation and all tubing shall be free of installation impurities and moisture before connecting to the control instrument. Fittings for polyethylene tubing shall be for instrument service and may be brass or acetal homopolymer of the compression or barb push-on type. Tubing shall be number coded or color coded and keyed to the submittal drawings for future identifying and servicing of the control system.

2.4.3.3 Room Thermostats

Thermostats shall be standard commercial type with an adjustable differential and a set-point range of 60 to 90 degrees F .

2.4.3.4 Outdoor Reset Thermostat

Thermostat shall be of the adjustable type set for a design temperature with a heating supply water temperature . A suitable ventilated weather shelter shall be provided for the outside sensing element. Unit shall be mounted indoors with its sensing element located in the outside air. Unit shall proportionally reset the control point of a remote sensing temperature controller.

2.4.3.5 Seven-Day Program Timer

Timer shall be provided with the proper switching action so that one timer will switch all zones. Timer schedule for each zone shall raise and lower the temperature twice during each 24-hour period throughout the week. During the weekend, there shall be one cycle of raising and lowering the zone temperature.

2.4.4 Control Valves and Controllers

Use the thermostatic steam regulating valve for constant temperature applications such as domestic hot water. Use steam pressure reducing valves where reduced constant downstream pressure is required. A central steam plant often requires this type of valve to reduce pressure prior to the distribution system.

2.4.4.1 Thermostatic Steam Regulating Valve

Valve shall be adjustable; shall have an operating range of approximately 100 to 200 degrees F and shall be furnished with a thermostatic element, steam valve, connecting capillary tubing, and all required accessories.

Thermostatic element shall be inserted in a separable socket in the hot-water supply main. Parts subject to wear shall be constructed of noncorrodible metal and shall be easily replaceable.

April 2019 Page 14 Section 23 70 03

2.4.4.2 Pressure-Reducing Valves

Valves designed for a working pressure of not less than 125 psig shall be provided where indicated or otherwise required. Each reducing valve shall be adjusted to maintain the desired terminal pressure within 3 psi, regardless of fluctuations in the initial pressure. Valves shall be quiet in operation. Reducing valves provided in lines for space heating only shall be of the double disk and seat type or sliding gate and plate type.

Reducing valves for dead-end service shall be single-seated or sliding gate and plate type. Parts subject to wear shall be constructed of noncorrodible metal and shall be easily replaceable.

2.4.4.3 General Purpose Control Valves and Controllers

Control valves and controllers shall as specified in Section 23 09 23

LONWORKS DIRECT DIGITAL CONTROL FOR HVAC AND OTHER LOCAL BUILDING SYSTEMS.

2.4.5 Flash Tank

If no flash tanks are required for the project, this paragraph will be deleted.

Tank shall be sized and installed as indicated and shall be of welded construction utilizing black steel sheets. Tank shall be provided with a handhole and with tapping for the condensate returns, drip lines, vent line, and condensate discharge line. Discharge line shall be equipped with a float trap. Vent pipe shall be of galvanized steel and fittings shall be of galvanized malleable iron. Vent pipe shall be installed as indicated. Vent piping shall be flashed as specified.

2.4.6 Steam Traps

2.4.6.1 Float Traps

Capacity, working pressure, and differential pressure of the traps shall be as indicated.

Drawings shall indicate steam trap capacities, working pressures, and differential pressures.

2.4.6.2 Float-and-Thermostatic Traps

Traps shall be designed for a steam working pressure of approximately 15 psig, but shall operate with a supply pressure of approximately 5 psig.

Capacity of the traps shall be as indicated. Trap capacity shall be based on a pressure differential of 1/4 psig. Each float-and-thermostatic trap shall be provided with a hard-bronze, monel, or stainless steel valve seat and mechanism and brass float, easily removable for inspection or replacement without disturbing the piping connections. Inlet to each trap shall have a cast-iron strainer, either an integral part of the trap or a separate item of equipment.

2.4.6.3 Bucket Traps

Traps shall be inverted or vertical bucket type with automatic air discharge. Traps shall be designed for a working pressure of 150 psig, but

April 2019 Page 15 Section 23 70 03 shall operate under a steam supply pressure of approximately 40 to 100 psig.

Each trap shall have a heavy body and cap of fine-grained, gray cast iron.

Bucket shall be made of brass; the mechanism of hard bronze; the valve and seat of stainless or monel; or each of equivalent material. Traps shall be tested hydrostatically under a pressure of 200 psig. Traps shall have capacities as indicated when operating under the specified working conditions. Strainer shall be provided on the inlet connection of each trap. Impact-operated traps, impulse-operated traps, or thermodynamic traps with continuous discharge may be installed in lieu of bucket traps, subject to approval. Thermostatic traps designed for a steam working pressure suitable for the application may be furnished in lieu of the traps specified above. Thermostatic traps shall be equipped with valves and seats of stainless steel, or monel metal, and shall have capacities based on a pressure differential not in excess of the following:

Steam Working Pressure Differential

25-50 psig 20 psig

2.4.6.4 Thermostatic Traps

Traps shall be installed in the return connection from each radiator. Size and capacity of the traps shall be as indicated. Drip traps for mains, risers, and similar live lines shall be installed with a cooling leg of 5 feet of bare 3/4 inch pipe. Capacity of all traps shall be based on a pressure differential of 3 psi. Traps shall be designed for a steam working pressure of 15 psig, but shall operate with a supply pressure of approximately 5 psig. Traps shall be of the angle pattern with union inlet connections. Trap bodies and covers shall be brass.

2.5 SPACE HEATING EQUIPMENT

2.5.1 Unit Heaters

Heaters shall have a heating capacity not in excess of 125 percent of the capacity indicated.

Indicate capacity of unit heaters and heating and ventilating units on drawings.

Noise level of each unit heater for areas noted shall not exceed the criteria indicated.

If the project has critical areas where maximum noise level limits are required, the maximum acceptable noise limits for these critical areas should be determined in NC level or dBA and should be indicated on drawings.

Recommended sound values for speech communication, based on normal voice are, according to ASHRAE FUN IP, as follows: 50 for fair; 44 for very good;

and 38 for perfect speech intelligibility.

2.5.1.1 Propeller Fan (Type I) Heaters

Heaters shall be designed for suspension and arranged for horizontal or vertical discharge of air. Casings shall be not less than 20 gauge black steel and finished with lacquer or enamel. Suitable stationary or rotating

April 2019 Page 16 Section 23 70 03 air deflectors shall be provided to ensure proper air and heat penetration capacity at floor level based on established design temperature. Suspension from heating pipes will not be permitted. Fans for vertical discharge type heaters shall operate at speeds not in excess of 1,200 rpm, except that units with 50,000 Btu output capacity or less may operate at speeds up to 1,800 rpm. Horizontal discharge type unit heaters shall have discharge or face velocities not in excess of the following:

Unit capacity, cfm Face velocity, fpm

Up to 1,000 800 1,001 to 3,000 900 3,001 and over 1,000

2.5.1.2 Centrifugal Fan (Type II) Heaters

Heaters shall be arranged for floor or ceiling mounting. Heating elements and fans shall be housed in steel cabinets of sectionalized steel plates or reinforced with angle-iron frames. Cabinets shall be constructed of not lighter than 18 gauge black steel. Each unit heater shall be provided with a means of diffusing and distributing the air. Fans shall be mounted on a common shaft, with one fan to each air outlet. Fan shaft shall be equipped with self-aligning ball or roller bearings and accessible means of lubrication. Fan shaft may be either directly connected to the driving motor or indirectly connected by adjustable V-belt drive rated at 150 percent of motor capacity. Fans in any one unit heater shall be the same size.

2.5.1.3 Heating Elements

Heating coils and radiating fins shall be of nonferrous alloy. Heating elements shall be free to expand or contract and shall be pitched for drainage. Elements shall be tested under a hydrostatic pressure of 200 psig.

2.5.1.4 Motors

Motors shall be provided with manual selection switches for On-Off- Automatic, On-Off, or High/Low-Off operation and shall be equipped with thermal overload protection.

2.5.2 Heating and Ventilating Units

Indicate capacity of unit heaters and heating and ventilating units on drawings.

Units shall be ceiling- or floor-mounted type, self-contained, with the heating coils, fans, dampers, and filters completely encased in a steel housing of sectionalized steel plates or reinforced with an angle-iron frame. Each unit shall be provided with latched, removable access panels located so that any equipment within the housing can be removed for cleaning or maintenance. Fan section of the housing shall be internally insulated with not less than 1-1/2 inches of fibrous glass insulation of not less than 3/4 pound/cubic foot density and maximum K-factor of 0.26.

April 2019 Page 17 Section 23 70 03

2.5.2.1 Heating Coil

Coil shall be of nonferrous alloy, free to expand and contract, and shall be pitched for drainage. Coil shall be tested hydrostatically after assembly of the unit and provided tight under a gauge pressure of 200 psig.

2.5.2.2 Fans and Drive

Fans shall be the multiblade centrifugal type, one to each air outlet, mounted on a common shaft. Fans within any one unit shall be of the same size. Fan units shall be installed on vibration isolators and shall be completely isolated from the building structure. Bearings shall be ball, roller, or taper type and shall be provided with lubrication fittings, externally accessible at the drive side of the unit. Fans shall be directly connected or indirectly connected to the driving motors through V-belt drive. V-belt drive shall be rated for 150 percent of motor capacity.

Adjustable sheaves shall be provided to produce at least 20 percent fan speed adjustment. Sheaves shall be selected to produce specified fan capacity at the midpoint of the adjustment.

2.5.2.3 Motor

Motor shall be provided with general purpose type enclosure. Direct-connected motors shall operate at a speed not in excess of 1,200 rpm, and motors using V-belt drives shall operate at 1,750 rpm. Adjustable base rails shall be provided for motors of V-belt driven fans.

2.5.2.4 Filters

Filters and filter racks of the V- or flat-type arrangement shall be provided. Filters shall be removable from one accessible side of the unit.

Filters shall be 2 inches thick replaceable throw-away type, in accordance with ANSI/AHRI 850.

2.5.2.5 Duct Connections

Outside air intake shall be provided with aluminum, copper, or galvanized steel rain louvers with 1/2 inch mesh, 18 gauge galvanized wire screen and 16 by 18 mesh aluminum insect screen. Intake box shall be constructed of not less than 20 gauge galvanized steel. Dissimilar metal shall be separated from galvanized steel by plastic membrane. Discharge ductwork, diffusers, registers, and grilles shall be as specified in Section 23 00 00

AIR SUPPLY, DISTRIBUTION, VENTILATION, AND EXHAUST SYSTEM.

2.5.2.6 Dampers

Dampers shall be galvanized steel, opposed-blade type with ball bearings.

Mixing dampers for outside and return air shall be provided as one assembly in a mixing box.

2.6 SYSTEM ACCESSORIES

2.6.1 Foundations and Anchorage

Foundations and anchorage for pumping units and for other heating equipment shall be in accordance with the manufacturer's requirements.

April 2019 Page 18 Section 23 70 03

2.6.2 Pressure Gauges and Thermometers

Gauges shall be provided for piping as indicated. Gauges shall comply with ASME B40.100 and thermometers shall comply with ASME PTC 19.3. A thermometer and pressure gauge shall be provided on the steam supply and return mains. Thermometers shall be separable socket type.

2.6.3 Vacuum Relief Valve

An approved vacuum relief valve shall be installed where indicated. On shutoff of steam supply and condensing of steam, the vacuum relief valve shall automatically admit air to the system.

2.6.4 Safety Valves

Pop safety valves shall be provided on the low side of each pressure reducing valve. The valves shall be set to open automatically and to relieve steam at 5 psi in excess of the setting of the reducing valve, or as indicated. Safety valves shall conform to the requirements of ASME BPVC SEC VIII D1 and shall be installed as indicated.

2.6.5 Drains

A drain connection with 1 inch gate valve or 3/4 inch hose bib shall be installed at the lowest point in the return main. In addition, threaded drain connections with threaded cap or plug shall be installed wherever required for thorough draining of the steam system.

2.7 PIPING AND ACCESSORIES

2.7.1 Pipe and Fittings

2.7.1.1 Steam Piping and Fittings

Piping shall be black steel, conforming to ASTM A53/A53M, Grade A. Fittings shall be black, malleable iron or steel. Fittings adjacent to valves shall suit valves specified. Reducing fittings shall be used for changes in pipe sizes. In horizontal steam lines, reducing fittings shall be the eccentric type to maintain the bottom of the lines at the same level.

2.7.1.2 Condensate Return Piping and Fittings

Piping shall be black steel, extra strong weight, conforming to ASTM A53/A53M, Grade A. Fittings shall be cast iron or malleable iron, extra heavy.

2.7.1.3 Vent Piping and Fittings

Piping shall be black steel, conforming to ASTM A53/A53M, Grade A. Fittings shall be black malleable iron to suit piping. Plastic materials polyetherimide (PEI) and polyethersulfone (PES) are forbidden to be used for vent piping of combustion gases.

April 2019 Page 19 Section 23 70 03

2.7.1.4 Gauge Piping

Piping shall be copper tubing, Type K or L, for steam and condensate 25 psig and less and steel for greater than 25 psig.

2.7.2 Joints

Except as otherwise specified, fittings used on steel pipe shall be threaded for fittings 1 inch and smaller; threaded or welded for fittings 1-1/4 inches up through 2-1/2 inches; and flanged or welded for fittings 3 inches and larger. Joints between sections of copper tubing or pipe shall be flared or sweated. Pipe and fittings 1-1/4 inches and larger and installed in inaccessible conduits or trenches beneath concrete floor slabs shall be welded. Unless otherwise specified, connections to equipment shall be made with black malleable iron unions for pipe 2-1/2 inches or smaller in diameter, and with flanges for pipe 3 inches or more, in diameter.

2.7.2.1 Bellows-Type Joints

Joints shall be flexible, guided type. Expansion element shall be stainless steel. Joints shall be in accordance with the applicable requirements of EJMA Stds and ASME B31.1 with internal liners.

2.7.2.2 Flexible Ball Joints

Joints shall be constructed of stainless steel, malleable iron, ductile iron, carbon steel, bronze, or other alloys as appropriate for the service intended.

2.7.2.3 Dielectric Waterways and Flanges

Dielectric waterways shall conform to the tensile strength and dimensional requirements specified in ASME B16.39. Waterways shall have metal connections on both ends suited to match adjacent piping. Dielectric waterways shall be internally lined with an insulator specifically designed to prevent current flow between dissimilar metals. Dielectric waterways shall have pressure and temperature rating equal to or greater than that specified for the connecting piping. Dielectric flanges shall meet the performance requirements described herein for dielectric waterways.

2.7.3 Strainers

Basket or Y-type strainers shall be the same size as the pipelines in which they are installed. The strainer bodies shall be cast-iron rated for 125 pound service, with bottoms drilled and plugged. Bodies shall have arrows cast on the sides to indicate the direction of flow. Each strainer shall be equipped with a removable cover and sediment basket. Basket shall not be less than 22 gauge and shall have perforations to provide a net free area through the basket of at least four times that of the entering pipe.

2.8 SEQUENCE OF AUTOMATIC CONTROLS

Sequence of automatic controls shall be as specified in Section 23 09 23

LONWORKS DIRECT DIGITAL CONTROL FOR HVAC AND OTHER LOCAL BUILDING SYSTEMS.

April 2019 Page 20 Section 23 70 03

2.9 FACTORY COATING

Radiator and convector enclosures shall be coated with the manufacturer's standard rust inhibiting primer. Other equipment and component items, when fabricated from ferrous metal, shall be factory finished with the manufacturer's standard finish.

PART 3 EXECUTION

3.1 EXAMINATION

After becoming familiar with all details of the work, verify all dimensions in the field, and advise the Contracting Officer of any discrepancy before performing any work.

3.2 INSTALLATION

All work shall be installed as indicated and in accordance with the manufacturer's diagrams and recommendations. Submit detail drawings consisting of schedules, performance charts, brochures, diagrams, drawings, and instructions necessary for installation of the systems as specified.

Submit detail drawings for pumping units and appurtenances, including controls. Indicate in the Drawings clearances required for maintenance and operation and complete wiring and schematic diagrams, equipment layout and anchorage, and any other details required to demonstrate that the system has been coordinated and will properly function as a unit.

3.2.1 Piping

Unless otherwise specified, pipe and fitting installation shall conform to the requirements of ASME B31.1. Pipe shall be cut accurately to measurements established at the jobsite and worked into place without springing or forcing, completely clearing all windows, doors, and other openings. Cutting or other weakening of the building structure to facilitate piping installation will not be permitted without written approval. Piping or tubing shall be cut square, shall have burrs removed by reaming, and shall be so installed as to permit free expansion and contraction without causing damage to building structure, pipe, joints, or hangers. Filings, dust, or dirt shall be wiped from interior of the pipe or tubing before connections are made. Changes in direction shall be made with fittings, except that bending of pipe up to 4 inches size will be permitted, provided a pipe bender is used and wide sweep bends are formed. The center line radius of bends shall not be less than six diameters of the pipe. Bent pipe showing kinks, wrinkles, flattenings, or other malformations will not be accepted. Vent pipes shall be installed through the roof as directed and shall be flashed as specified. Horizontal supply mains shall pitch up or down in the direction of flow as indicated. The grade shall be not less than 1 inch in 40 feet. Reducing fittings shall be used for changes in pipe sizes. Open ends of pipelines and equipment shall be capped or plugged during installation to keep dirt or other foreign materials out of the systems. Pipe not otherwise specified shall be uncoated. Unions for copper pipe or tubing shall be brass or bronze. Connections between ferrous piping and copper piping shall be electrically isolated from each other with dielectric waterways or unions.

April 2019 Page 21 Section 23 70 03

3.2.1.1 Threaded Joints

Threaded joints shall be made with tapered threads properly cut, and shall be made tight with polytetrafluoroethylene (PTFE) tape complying with ASTM D3308, or equivalent joint compound applied to the male threads only, and in no case to the fittings.

3.2.1.2 Welded Joints

Welded joints shall be fusion-welded unless otherwise required. Changes in direction of piping shall be made with welding fittings only. Branch connection may be made with either welding tees or forged branch outlet fittings. Branch outlet fittings shall be forged, flared for improvement of flow where attached to the run, and reinforced against external strains.

Beveling, alignment, heat treatment, and inspection of weld shall conform to ASME B31.1. Weld defects shall be removed and repairs made to the weld, or the weld joints shall be entirely removed and rewelded at no additional cost to the Government. Electrodes shall be stored and dried in accordance with AWS D1.1/D1.1M or as recommended by the manufacturer. Electrodes that have been wetted or that have lost any of their coating shall not be used.

3.2.1.3 Flanges and Unions

Flanges and unions shall be faced true, and made square and tight. Gaskets shall be nonasbestos compressed material in accordance with ASME B16.21, 1/16 inch thickness, full face or self-centering flat ring type. The gaskets shall contain aramid fibers bonded with styrene butadiene rubber (SBR) or nitrile butadiene rubber (NBR). NBR binder shall be used for hydrocarbon service. Union or flange joints shall be provided in each line immediately preceding the connection to each piece of equipment or material requiring maintenance such as coils, pumps, control valves, and other similar items.

3.2.1.4 Flared and Sweated Pipe and Tubing

Flared and sweated pipe and tubing shall be cut square and burrs shall be removed. Both inside of fittings and outside of tubing shall be cleaned with an abrasive before sweating. Care shall be taken to prevent annealing of fittings and hard drawn tubing when making connection. Installation shall be made in accordance with the manufacturer's recommendations.

Mitering of joints for elbows and notching of straight runs of pipe for tees will not be permitted. Joints for soldered fittings shall be made with silver solder. Joints for flared-type fittings shall be provided on all branch connections, mains, and risers to provide for expansion and contraction of the pipe without stress to fittings, pipe, or tubing.

3.2.1.5 Copper Tube Extracted Joint

An extracted mechanical tee joint may be used in copper tube. Joint shall be produced with an appropriate tool by drilling a pilot hole and drawing out the tube surface to form a collar having a minimum height of three times the thickness of the tube wall. To prevent the branch tube from being inserted beyond the depth of the extracted joint, dimpled depth stops shall be provided. The branch tube shall be notched for proper penetration into fitting to ensure a free flow joint. Joints shall be brazed in accordance with the NAPHCC NSPC. Soldered joints will not be permitted.

April 2019 Page 22 Section 23 70 03

3.2.2 Connections to Equipment

Supply and return connections shall be provided by the Contractor unless otherwise indicated. Valves and traps shall be installed in accordance with the manufacturer's recommendations. Unless otherwise indicated, the size of the supply and return pipes to each piece of equipment shall not be smaller than the equipment connections. Steam and return connections, unless otherwise indicated, shall be made with malleable iron unions for piping 2- 1/2 inches or less in diameter and with flanges for pipe 3 inches or more, in diameter.

3.2.3 Branch Connections

Branches shall pitch up or down as indicated, unless otherwise specified.

Connection shall be made to ensure unrestricted circulation; eliminate air pockets; and permit drainage of the system. Steam supply and condensate branches taken from mains shall pitch with a grade of not less than 1 inch in 10 feet, unless otherwise indicated.

Indicate on the drawings the direction of piping pitch, details of branch take-offs from mains, and pipe size reductions.

3.2.4 Risers

The location of risers is approximate. Exact locations of the risers shall be as approved. Steam supply downfeed risers shall terminate in a dirt pocket and shall be drip trapped to the return.

3.2.5 Supports

3.2.5.1 General

Hangers used to support piping 2 inches and larger shall be fabricated to permit adequate adjustment after erection while still supporting the load.

Pipe guides and anchors shall be installed to keep pipes in accurate alignment, to direct the expansion movement, and to prevent buckling, swaying, and undue strain. All piping subjected to vertical movement when operating temperatures exceed ambient temperatures, shall be supported by variable spring hangers and supports or by constant support hangers. Pipe hanger loads suspended from steel joist between panel points shall not exceed 50 pounds. Loads exceeding 50 pounds shall be suspended from panel points.

3.2.5.2 Pipe Supports and Structural Bracing, Seismic Requirements

Piping and attached valves shall be supported and…