Div15 Mechanical

8/2/2019 Div15 Mechanical

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Last revised 04/2010 1

DIVISION 15 MECHANICAL

15000 BASIC MECHANICAL REQUIREMENTS

A. Provide a list of symbols on drawings.

B. Provide unique numbers for all applicable equipment, valves, and similar.

C. Schedule all mechanical equipment on drawings.

D. Do not show or put plumbing or other piping in transformer vaults, elevator hoistways,elevator equipment rooms, telecommunications equipment rooms, or electrical equipmentrooms, unless required to supply room.

E. Restroom piping chase shall be 3-0 minimum width with piping located to allow full access.

F. Each main line strainer shall have valved sensing points at inlet and outlet, piped to acommon pressure gauge.

G. Hydronic heating and cooling coils shall be piped for counterflow.

H. When new roof openings are required for existing buildings, verify with the OwnersRepresentative whether roof is under warranty. If roof is under warranty, all openings mustbe made according to roof manufacturers details so that warranty will not be made void.

I. All piping shall be sized on drawings. Do not use pipe-sizing schedules.

J. All interconnections between domestic water and any other services shall include a backflowpreventer in the domestic water line. If line is used for filling system, include a water meterthat reads in gallons.

K. Oversize incoming domestic water service by 25% to allow for some future expansion.Contractor shall be required to furnish and install the water meter(s) and coordinateinstallation with the utility. Specify Badger meter with remote read in cubic feet (gallons willnot be accepted).

L. Piping mains, with the exception of sanitary and storm piping, shall not be buried under floorslabs. Accessible piping tunnels shall be installed as required.

M. All equipment in mechanical spaces shall be readily accessible. This includes but is notlimited to, dampers, valves, actuators, etc.

N. Basis for high pressure steam design shall be 150 psig, 500F.

O. For well water used in cooling systems, maximum discharge temperature leaving building is97F.


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15050 BASIC MECHANICAL MATERIALS AND METHODSA. General

1. Pipe routing may be modified as required to clear building structures, openings, lights,ducts, or other services.

2. Route piping parallel to building lines.

3. Provide sufficient unions, flanges and valves to permit removal of equipment.

4. Spacing shall be adequate to permit servicing valves and specialties and replacingsections of pipe.

5. Slope pipe to permit complete draining. Install drain valves at low points, vents at highpoints. Connect branch piping to top of main (install valve in branch connection).

B. Utility Connections

Specify that Contractor is to notify Owners Representative to coordinate connection of

services onto existing systems.

15060 PIPE AND PIPE FITTINGSA. Plastic pipe shall not be used unless required for specialty piping. Verify with Owners

Representative.

B. Dielectric unions or dielectric couplings should be used where two dissimilar metals areconnected together.

C. Subject to meeting Code requirements pipe materials should be according to UNISTANDARD PIPE SCHEDULE (below).

D. Specify piping system test pressures for all services.

E. Flanged steam and return lines shall have Flexitallic gaskets.

F. UNI STANDARD PIPE SCHEDULEInside Building

Service Material

1. Sanitary and vent, underground. Cast iron soil pipe.SPEC. NO. 7

2. Sanitary and vent, above ground. 1 and under: Galvanized

steel pipe.SPEC. NO. 5 orCopper tube, type L.

SPEC. NO. 92 and over: Cast iron soil pipe.

SPEC. NO. 7 orCast iron soil pipe.

SPEC. NO. 12


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Storm underground Cast iron soil pipe.SPEC. NO. 7

4. Storm above ground Cast iron soil pipe.SPEC. NO. 7 or

Galvanized steel pipe.SPEC. NO. 5 or

Galvanized steel pipe.SPEC. NO. 6 or

Cast iron soil pipe.SPEC. NO. 12

5. Potable hot and cold water above ground 2 and under: Copper tube, typeL.

SPEC. NO. 13 and over

Copper tube, type L, grooved.SPEC. NO. 14

6. Potable hot and cold water underground Copper tube, type K.SPEC. NO. 2

7. Heating hot water 2 and under: Copper tube, type L.SPEC. NO. 1

2 and over: Black steel pipe,schedule 40.

SPEC. NO. 3 orBlack steel pipe, schedule 40.

SPEC. NO. 13

8. Chilled water Copper tube, type L.



SPEC. NO. 13

9. Condensate drain Copper tube, type L.SPEC. NO. 9

10. Steam-low pressure 15 PSIG Black steel pipe, schedule 40.SPEC. NO. 3

11. Steam-high pressure 135 PSIG Black steel pipe, schedule 40.SPEC. NO. 3

12. Steam condensate return Black steel pipe, schedule 80.SPEC. NO. 4

13. Specialty piping Verify material required for eachproject with Owner.


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14. Natural gas Exposed: Black steel pipe, schedule

40.SPEC. NO. 11

Concealed: Black steel pipe,schedule 40

SPEC. NO. 11

15. Acid waste and vent, including traps Polypropylene.SPEC. NO. 8

16. Compressed air equipment room Black steel pipe, schedule 40.SPEC. NO. 3

17. Compressed air medical and lab Copper tube, type L.SPEC. NO. 1

18. Vacuum Copper tube, type L.SPEC. NO. 1

19. Sprinkler Black steel pipe, schedule 40.SPEC. NO. 10

G. UNI STANDARD PIPE SPECIFICATIONS

SPEC. NO. 1

Pipe: Type L hard temper copper, ASTM B88.

Joints: Solder type with 95-5 solder.

Fittings: Wrought copper solder joint, ANSI B16.22.

SPEC. NO. 2

Pipe: Type K soft temper copper, ASTM B88.

Joints: Solder type with Sil-fos, or flared type.

Fittings: Wrought copper solder joint, ANSI B16.22, or brass flared fittings,ANSI B16.26.

Note: 1. No fittings under floor slabs or inaccessible.

SPEC. NO. 3

Pipe: Schedule 40 black steel, ASTM A120, or A53 < 25 PSIASTM A53 or A106 Grade B > 25 PSI


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Joints, Unions, Fittings: High pressure: 2 and under: socket weld

High pressure steam piping fittings shall be steel.

Low pressure: 2 and under: Malleable iron or cast ironscrewed fittings, ANSI B16.3, 125 lb. (S) 175 lb. (WOG).2 and over: Butt weld schedule 40 steel fittings, ANSI

B16.9.

Flanges: 2 and over: Forged steel welding neck or slip-on, 150PSIG, ANSI B16.5.

SPEC. NO. 4

Pipe: Schedule 80 black steel, ASTM A120.

Joints, Unions, Fittings: High pressure: 2 and under socket weld

Low pressure: 2 and under: Malleable iron screwed

fittings, ANSI B16.3, 125 lb. (S) 175 (WOG).

2 and over: Butt weld schedule 80 steel fittings, ANSIB16.9.


SPEC. NO. 5

Pipe: Schedule 40, galvanized steel, ASTM A120, or A53.

Joints: Screwed.

Fittings: Galvanized cast iron drainage type, ANSI B16.12.

SPEC. NO. 6

Pipe: Schedule 40, galvanized steel, ASTM A120, or A53.

Joints: Bolted clamp type coupling with grooved end lock. Victaulicor equal

Fittings: Galvanized malleable iron, grooved ends, ASTM-A47. Use

q drainage type for storm lines.

SPEC. NO. 7

Pipe: Cast iron soil pipe, service weight, coated inside and out,ASTM A74.


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Joints: Bell and spigot, or molded elastomeric gasket type withpush-on joints.

SPEC. NO. 8

Pipe: Polypropylene flame retardant pipe, schedule 40, Fusealor equal.

Joints: Electrical fusion type.

Fittings: Socket type to match piping.

SPEC. NO. 9


Joints: Solder type with 95-5 solder.

Fittings: Cast brass solder joint drainage type ANSI B16.23 or

wroughtcopper solder joint drainage type, ANSI B16.29.

SPEC. NO. 10

Pipe: Schedule 40 black steel, ASTM A120 or A53.

Joints: Screwed or flanged.2 and over: Screwed, flanged, or grooved.

Fittings: Screwed: cast iron 125 lb. class, ANSI B16.4, or malleableiron, 150 lb. class, ANSI B16.3.

Flanged: cast iron 125 lb. class, ANSI B16.1.Grooved: malleable iron, U.L. listed and FM approved.

Note: 1. Plain end fittings and couplings are not approved.1. Use of welded joints must be approved by Owner.

SPEC. NO. 11

Pipe: Schedule 40 black steel, ASTM A120, or A53.

Joints: 2 and under: Welded2 and over: Welded and flanged.

Fittings: 2 and under: Socket weld steel fittings, ANSI B16.11,2000 lb. 2 and over: Butt weld schedule 40 steel,fittings, ANSI B16.9.

Unions: 2 and under: Malleable iron ground joint with brass seat,250 lbs. (S) 500 lb. (WOG)


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Note: 1. No flanged connections in concealed spaces.

SPEC. NO. 12

Pipe: Cast iron soil pipe, service weight, coated inside and out,No-Hub, ASTM A74.

Joints: Neoprene sealing sleeve with Type 301 stainless steelshield and screw type clamps.

SPEC. NO. 13

Pipe: Schedule 40, black steel, ASTM A135, or A53.

Joints: Bolted clamp type coupling with grooved end lock.Victaulic or equal.

Fittings: Black malleable iron, grooved ends, ASTM-A47.

SPEC. NO. 14


Joints: Bolted clamp type coupling with grooved end lock, ASTMA-536. Victaulic or equal.

Fittings: Cast bronze, grooved ends, ASTM B-584-87, or wroughtcopper, grooved ends ASTM B-75.

Note: 1. Fluid velocity in roll groove area must be less than 5fps.

H. Pipe Schedule and Specifications Notes

1. This information is given as a general guide. Consultant is responsible that piping,fittings, etc. are suitable for service intended.

2. All welding shall conform as to workmanship, testing and general requirements withwelding section ANSI B31.

15100 VALVES

A. Show all valve locations on drawings.

B. Provide isolating valves on all items subject to repair or replacement.

C. Isolation valves installed on high-pressure mains should be installed with start-up bypassvalves.


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D. All valves should be rising stem valves except where ball valves are used.

E. Balancing valves shall be Griswold control valve (IRIS model) or equal by Victraulic, B & Gand should be installed on each heating and cooling unit and at each hot or chilled waterpump. Consultant to schedule cartridge sizes for valves.

F. Gate valves are preferred for steam and condensate return service where sufficient room to

maintain. If ball valves are used for steam, provide slow-closing operator. No cast ironvalves strainers, fittings, and similar on high pressure 125 psig or greater steam service upto, and including, the building pressure relief valve. Valves to be 150 pound class withFlexitallic Flexicarb style CG flange gaskets.

G. For high pressure steam mains, install bypass containing a globe valve for main warm-up.

H. Provide valving to isolate branch sections of main lines.

I. Valves required to isolate energy source shall have locking mechanism for lockout tagout.

15120 PIPING SPECIALTIES

A. Require strainers upstream of all pumps and control valves in chilled water and hot waterapplications.

B. Require strainers ahead of control valves and traps in steam applications.

C. Collecting and dirt leg sizing and diagram are found in the appendix.

D. Add drip pockets per ASHRAE handbook.

E. All branch lines shall connect at the top of the main line.

F. Expansion joints shall be packed metal expansion joint type. Hyspan 6500 series for basisof design.

15130 GAGESA. As a general rule, gages or gage openings are required on all piping systems to facilitate

operation of the system. The campus has a central building automation system thatremotes gage functions to a central location.

B. Gage range shall be one and one half (1.5) times the normal operating pressure of the fluidbeing measured.

C. The designer should use the following philosophy in the application of gages on systems.

1. Where a gage is to be used by the operator on a regular basis, we prefer to have thegage physically installed.

2. Where a gage is to be used by the operator on a regular basis and the application is ofa differential pressure nature (pumps, strainers, etc.) we prefer to have one gage andpiping to either side of the differential, physically installed.


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3. Where the gage is needed for occasional use but not needed every day by an operator,we do not prefer to have a gage physically installed. We prefer to have a P/T pluginstalled at this location.

D. Where gages are installed, we prefer gages to be at least 4 for piping systems and thatthey be readable without the use of a ladder.

E. All gages serving pumps shall be liquid filled with snubbers.

15140 SUPPORTS AND ANCHORS

A. Pipe hangers supporting cold lines shall not bear directly on piping. Hanger should beoutside of insulation, bearing on metal insulation shield and insulating block.

B. Insulation shield length and gauge shall be as specified in the current edition of MSS-SP69.

C. Insulation block shall be the same length and circumference of the insulation shield.

15160 PUMPS

A. Pumps shall be provided with motors, starters, controls, strainers, pressure gauges,vibration isolators, check valves, and isolation valves.

B. Drawing set shall include a pump schedule indicating number, capacities, pressures, motorhorsepower, rpm and other pertinent data for all pumps.

C. Hot water pumps shall be bronze fitted.

D. Chilled water pumps shall have stainless steel sleeves.

E. Pumps shall be set on a concrete foundation above the finished floor with vibration isolators

when required to avoid sound or vibration transmission.

F. Two (2) sets of strainer mesh are to be supplied with pumps. A fine mesh startup strainerand a running size mesh.

G. Where possible, use end suction pumps instead of split casing pumps. All pumps 1 h.p. andlarger are to be base mounted pumps.

H. Generally, the preferred pump is the B&G line. Alternate manufacturer include Armstrong,Peerless, and Taco.

I. All circulating pumps must have gate, ball, or butterfly valves on either side of the pump. Do

not use a check valve for a stop function.

J. The inlet to pumps needs to be 7 straight diameters as a minimum, or suction diffusers maybe used as an alternate.

K. Pumps which require removal from the system piping for servicing the impeller areunacceptable.


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L. Use submersible pumps for sewage ejection and sump pumping applications.

M. All pumps are to have mechanical seals.

N. Provide service space around all pumps. No pumps to be tight to ceilings or walls.

O. If triple duty valves are used, provide additional isolating valve to insure tight shut-off system

for pump maintenance.

P. Contact Owner for well water pump type.

15170 MOTORS

A. Except where otherwise specified for motors in mechanical and electrical work sections, thefollowing shall govern:

1. Motors (1/2) hp and smaller shall be:

a) Single phase, 115-volt.

2. Motors (3/4) hp and larger shall be:

a) 3-phase, 208-volt or 480 volt.

Specify that 3 phase motors for use on 208 V. systems shall be rated 200 voltsand 480 V systems shall be rated 460 volt. Motors rated 220 V. or 230 V. are notacceptable.

3. Exceptions will be made, as approved, in case of fractional hp motor-driven equipmentunits furnished by manufacturer with integral motor to suit his standard design.

B. Single-Phase Motors Shall Be:

1. Capacitor-start, split-phase or shaded-pole type, as approved for individual application.

C. Polyphase Motors Shall Be:

1. Squirrel-cage induction. Variable speed is achieved with power drives with IGBTS.

D. Multi-Speed Motors Shall Be:

1. Squirrel-cage induction type, three-speed, single or double winding, constant or variabletorque; as selected and approved for individual application.

E. Where motor type, hp, speed, or other essential data are not specified in detailedspecification of individual equipment unit or indicated on schedules, obtainthis information from manufacturer of equipment unit and have it approved, before orderingmotors.

F. Manufacturer


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1. Motors furnished under mechanical and electrical work shall be product of not morethan two manufacturers. Expectations will be made as approved in case of fractional hpmotors, or when motor is furnished integral with driven equipment unit asmanufacturers standard.

2. Motors shall be General Electric, Westinghouse, Century, Baldor, Reliance, Toshiba,Louis Allis, or approved equal.

G. Design/Performance

1. NEMA standards shall be taken as minimum requirements for motor design andperformance, except where otherwise specified.

2. Motors shall be suitable for load, duty, voltage, frequency and hazard, for service andlocation intended.

3. NEMA classification of motor enclosures shall apply when motor types are specified asopen drip-proof, splash-proof, totally enclosed and the like.

4. Motors shall have ball or roller type bearings with pressure grease lubrication.Exceptions will be made as approved, in special cases for sleeve type bearings withapproved method of oil lubrication.

5. Motors shall be quiet operating.

6. Motors shall be rated for continuous duty and under full load. Maximum rise intemperature shall not exceed 40C for open type, 50C for drip-proof and splash-prooftypes, 55C for explosion-proof and totally enclosed types.

7. Motors shall be capable of withstanding momentary overloads of 50%, without injuriousoverheating.

8. Motors for belt drive shall have adjustable bases.

9. Motors for direct drive with coupling shall be aligned, coupled, and doweled to baseplate in at least two points. The drive unit will also be doweled in two places.

10. Motors shall have name plates giving manufacturers name, voltage, phase, HZ, hp,rpm, full load current and service factor.

11. Motors shall have flexible leads of sufficient length to extend 3 minimum beyond faceof conduit terminal box. Motors five hp and larger shall have terminal lugs.

12. Motors shall not have a service factor of less than 1.15.

13. All motors five HP or larger shall be energy-efficient type.

14. Submittals shall be obtained from the manufacturer and shall include, but not be limitedto, the following:

a) Physical dimensions or NEMA frame size.


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b) Bearing information

c) Performance curves for power factor and efficiency at various loads. Data takenper NEMA Std. MG1-12.53a (IEEE 112 Method B).

d) Name plate data including NEMA nominal efficiency per NEMA (MGI-12.53b).

e) Maintenance recommendations.

15. Motor Tests

a) For motors over (200) hp, make complete test for each motor furnished and submitcertified test data sheets for approval.

16. Warranty shall not be less than one year from start-up date.

15190 MECHANICAL IDENTIFICATION

A. All systems and components shall be identified with equipment codes. (Coordinate withOwners Representative.)

1. For any remodeling or additions, requests will have to be made for next available codefor each type of system/component.

2. Coded labels shall follow through for all areas and sub-components associated witheach identified unit, i.e., power distribution, starters and temperature control panels.

3. Equipment code label materials shall match the Owners existing labels.

B. Provide pipe coding for all piping.

1. All wording/color combinations shall meet ANSI A13.1 standards and UNI standards.

2. Seton Type SNA/STR Setmark, or equal, pipe markers are preferred.

15240 MECHANICAL SOUND AND VIBRATION CONTROL

A. The latest edition of the ASHRAE handbook with the Sound and Vibration Control chaptershall be used to establish design standards.

B. All mechanical rotating equipment shall be within the fair range of the General MachineryVibration Severity Chart as a put forth by IRD Mechanalysis, Inc. at the time of building

acceptance.

C. Flexible pipe connectors are to be metal type flexible connectors with stainless steel hosebody and stainless steel braided casing (change metal type as appropriate). Neoprene,rubber, EPDM type connectors are not allowed.

15250 MECHANICAL INSULATION


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A. General

1. Pipe insulation shall conform to or exceed minimum thicknesses stated inASHRAE/IESNA 90.1, codified version.

2. Outside air duct insulation should be on duct exterior to prevent possible water damage.

3. Do not insulate chilled water control valves in fan coils. Locate valve over drain pan.

4. Avoid lined duct upstream of reheat coil.

5. Items concealed, valves, strainers, unions, balance dampers, etc. shall be clearlymarked on the outside of the covering.

6. Provide removable insulation blankets for high pressure steam system: Valves,expansion joints & similar.

7. For high pressure steam and condensate located in tunnels, provide 0.024 inchaluminum jackets over insulation.

8. The following systems shall be insulated. All cold piping and ductwork shall havecomplete vapor barrier protection.

a) Cold potable water piping.

b) Refrigerant suction piping.

c) Ductwork as required by service.

d) Chilled water piping, valves and accessories.

e) Chiller evaporator.

f) Roof drain piping.

g) Condensate drain piping.

h) Hot potable water piping.

i) Heating hot water piping.

j) Steam piping.

k) Condensate return piping.

l) Plumbing vents for five feet below roof.

m) Heat exchangers.

n) Storage water heaters.


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o) Air eliminating units.

B. Materials

1. All products shall conform to NFPA Sections 90A and 90B with special regard to firehazard classification requirements of NFPA No. 255, latest revision, including vaporbarriers and adhesives. All products shall possess a flame spread rating of not over 25,

without evidence of continued progressive combustion and a smoke developed ratingno higher than 50.

15440 PLUMBING FIXTURES

A. Use wall hung water closets.

B. Water closets shall be siphon jet flush valve type with elongated bowl and black open frontseat with check hinge. Low water usage. Color shall be white.

C. Urinals shall be washout flush valve type with integral side panels. Low water usage.

D. Service sinks shall be floor type precast receptor with hose, hose bracket, mop hanger andpail hook double supply spout set at 36 above receptor rim. Install sanitary panels on wallaround sink 3 minimum height.

E. Lavatory faucets shall conform to ASHRAE/IESNA 90.1, codified version.

F. Use electric water coolers.

G. Install ADA compliant fixtures as required.

H. Provide floor drains in all toilet rooms and mechanical rooms.

I. Provide wall hydrant to all mechanical rooms.

J. Provide loose key hose bibs on all exterior walls of the building.

K. Provide vacuum breakers on all faucets with hose connections. This shall include labfaucets, but exclude distilled water faucets.

L. Use hand-wired sensor type flush valves and faucets. Delta is preferred for faucets.

M. Provide eye washes and safety showers to meet EH&S standards.

N. Fume hood water service vacuum breakers shall not be located within hood.

O. Do not use pop-up lavatory drains in public areas. Provide perforated or grid drains.

15461 DOMESTIC WATER HEATERS

A. In general, steam fired storage or semi-instantaneous water heaters shall be used. Use ofstorage units only if adequate access exists for replacement.


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B. Storage water heaters shall have cement lining. This lining shall be applied after heater isinstalled on site. Factory applied cement linings will not be accepted.

C. Semi-instantaneous water heaters shall have copper lining and 10 year non-proratedwarranty on tank and heat exchanger.

D. Storage water heater tanks shall have 5 year non-prorated warranty on tank and lining.

E. Working pressure shall be 150 psig.

15500 HEATING, VENTILATING, AND AIR CONDITIONING (HVAC)

A. All equipment shall be furnished with the manufacturers installation directions and operatingand maintenance instructions.

B. Provide positive ventilation in equipment rooms to prevent damage from heat and humidity.

C. Design conditions shall conform to ASHRAE/IESNA 90.1, codified version.

D. Outside air intakes should be located so they will not be contaminated by fume hoodexhaust, building exhausts, vents or motor exhausts.

E. Do not use electric heating coils or electric heat without Owner approval.

F. In general, systems shall provide heating and cooling year-round to accommodate thedesired occupancy.

1. Proposed systems require life cycle costing and compliance with the ASHRAE/IESNA90.1, codified version.

a) The impact of central system zoning needs consideration. The cost analysis must

include the operational costs as the building is operated and not be based onsquare footage costs alone. Zoning of the systems by occupant function, and theability to shut down areas occupied only during regular university hours is stronglyencouraged.

b) The impact of the mechanical selection should include the maintenance costing aswell as the energy cost impact.

2. Wherever possible, the sources of energy should be from the central heating plant.

a) The source of heat should be steam in all cases.

b) The source of humidification should be steam, unless the economies of operationdictate the use of another method (i.e., evaporative).

3. When radiation systems are supplied, they must not be string type radiation. Eachpiece should be connected to the supply and return independently.

15515 HYDRONIC SPECIALTIES


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A. Backflow preventers shall be used where city water could be contaminated throughsiphoning or back pressure.

B. Chemical pot feeders shall be included on all hot water systems and on chilled watersystems.

C. Provide meter for well water system. Badger industrial turbo/MSERI Register. Connect and

transmit data via the building automation system to UNI Energy Management.

15525 STEAM AND STEAM CONDENSATE SPECIALTIES

A. Steam trap capacity shall be at least twice the maximum rating of the anticipated loadrequirements.

B. Traps shall be piped for easy servicing. Install inspection value for testing trap.

C. Traps shall be piped a minimum of 12 below the outlet of the devices they serve.

D. Do not use inverted bucket traps on any application over 50 psig. Owner will supply all high

pressure steam traps.

E. Safety valves shall have the appropriate ASME stamp.

F. Use Armstrong, Hoffman, or TLV steam traps. See appendix for details.

G. Steam pressure reducing valves shall provide tight shut-off for dead end service to preventsafety valve pop off. This shall include reducing valves on autoclaves and other equipmentsupplied with steam.

H. Pressure reducing valve (PRV) shall be Masoneilan Camflex 3500 Series. Normally closedvalve. Reverse acting control head.

I. Provide condensate metering using Badger 2 industrial turbo/MSERI Register. Connectand transmit data via the building automation system to UNI Energy Management. Mount inaccessible location to allow meter reader to view dial.

J. Condensate pumps need a union, a check valve, and a stop valve on dischargeconnections. Grundfos preferred. Packaged receiver/pump unit Sterling preferred (steeltank, 40 psi discharge). DO NOT place condensate receiver underground. Installcondensate bypass and receiver drain per Condensate Pump detail in Appendix.

15535 REFRIGERATION SPECIALITIES

A. Vibration isolators shall be provided in the suction and discharge lines of all refrigerationcompressors.15545 CHEMICAL WATER TREATMENT (CLOSED SYSTEM)

A. Materials

1. Proprietary blend containing the following items:


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a) Corrosion Inhibitors: Sodium, nitrite-borax with added inhibitors such asmercaptobenzothiazole, sodium tolytriazole, or phenyltriazole to protect copper andbrass and minimize dielectric pitting of steel. Maintain 2,000 ppm nitrate in heatingsystems and 900 ppm in cooling systems. Adjust borax content to maintain correctpH for type of system (mainly steel or mainly copper)

b) Scale Inhibitor: Organic phosphonates such as aminomethylene-phosphonate;

phosphonates such as hydroxyethylidenediphosphonate or polyamino-substitutedphosphonates; or synthetic polymers such as low-molecular-weight polyacrylates,poly-methacrylates and polyacrylandies. Inorganic polyphosphates are notacceptable. Maintain residual concentration as recommended by the manufacturer.

B. Equipment

1. Bypass (Pot) Feeder with funnel, fill valve, drain valve, air cock, working pressure of300 psig. Install eyewash station near the chemical pot feeder.

15610 FURNACES

A. Furnaces will not be installed except in special cases approved by the OwnersRepresentative.

15620 DUCT AND UNIT HEATERS

A. Duct furnaces will only be installed in special cases approved by the OwnersRepresentative.

B. Unit Heater

1. The preferred unit heater will be steam. Gas or electric units will only be approved incases where steam or hot water is unavailable.

15655 REFRIGERATION COMPRESSORS

A. Compressors shall be equipped with some type of capacity control, (unloaders, variablespeed, step control, etc.) when their normal capacity is 5 tons or more.

B. All compressors which are placed outdoors should be equipped with crankcase heaters.

C. All compressors are to have the normal safety controls:

1. A combination high and low pressure cutout.

2. An oil failure switch.

D. Refrigerants R-11 and R-12 shall not be used.

E. See ASHRAE-IESNA 90.1, codified version, for minimum efficiencies.

15670 CONDENSING UNITS


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A. Condensing units shall not be installed except in special cases, approved by the OwnersRepresentative.

B. All condensing units which are located outdoors shall be provided with the followingequipment:

1. Head pressure stabilization control, either through condenser fan control or a head

pressure control valve.

2. Heat tape on the condenser receiver.

3. A compressor crankcase heater.

C. Compressors in condensing units shall comply with the guidelines in Section 15655Refrigeration Compressors.

D. Unit must be capable of using a condenser air fan motor speed control device for headpressure control. Unit must also have provisions for low ambient starting, when the lowpressure switch is connected at the liquid line service valve port.

E. Refrigerants R-11 and R-12 shall not be used.

F. See ASHRAE/IESNA 90.1, codified version, for minimum efficiencies.

15680 WATER CHILLERS

A. All water chillers shall be equipped with freeze protection on the evaporator heat exchanger.

B. Refer to Section 15655 Refrigeration Compressors and Section 15740 Condensers for otherapplicable guidelines.

C. See ASHRAE/IESNA 90.1, codified version, for minimum efficiencies.

D. Specify a minimum of 2-year warranty for chillers. Consultant shall contact major vendors todiscuss extended warranty options and review with UNI for inclusion into the specifications.

E. Specify lifting eyes on headers to accommodate removal.

F. Specify lifting beam above chiller for head removal.

G. Specify spool pieces on piping to accommodate head removal.

H. Specify appropriate clear space to accommodate re-tubing of unit.

15710 COOLING TOWERS

A. Do not use indoor cooling towers.

B. Ceramic towers preferred.

C. Towers shall not be installed on roofs.


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D. Provide condenser water treatment.

15740 CONDENSERS

A. Air-cooled condensers shall have some type of head pressure stabilization control eitherthrough condenser fan control or a head pressure control valve.

B. All condenser coils shall be easily accessible for cleaning.

C. Water cooled condensers which are cooled with city water shall drain to the storm sewer.Use only with Owners approval.

D. Water flow shall be controlled by discharge temperature with an automatic valve.

E. When there are multiple water cooled condensers that would normally use city water, thepreference is to recirculate condenser water through a chilled water-to-condenser waterheat exchanger to avoid wasting water.

15755 HEAT EXCHANGERS

A. Provide check valve vacuum breakers on the shell of steam-to-water heat exchangers toassure free condensate drainage when control valve closes.

B. Plate type steam-to-water heat exchangers shall not be used.

C. Plate Frame Heat Exchangers: Contact Owner to determine if a spare set of gaskets are tobe provided.

15781 PACKAGED HEAT PUMPS

A. Consult Owner regarding use.

15790 AIR COILS

A. Chilled water coils for air handlers shall have minimum 0.035 copper tube with minimum0.049 bends and shall have aluminum fins. Must be certified to ARI Standard 410.

B. Cooling coils using raw well water shall have removable heads.

C. Integral drain pans and center supports shall be provided according to good constructiontechniques and application of coil.

1. Standard design shall be 45F EWT, 55F LWT, chilled water.

D. Chilled water fan coil units shall have 0.020 copper tube and aluminum fins.

E. Steam and hot water coils for air handlers shall have 0.035 tube thickness.

1. Non-freeze type coils shall have 1 tube diameter and wall thickness of 0.035.


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F. All water coils should be provided with integral minimum vent and drain connections, and

they shall be extended to the outside of the housing and valved.

G. Cooling coils shall not exhibit condensate carry over. Preferred cooling coil face velocity is500 FPM or less.

H. The maximum number of rows for any single coil shall be 6. Install coils in series if morerows are required. Provide space between coils to allow for coil repair and cleaning.

I. Provide space to remove coils.

J. Provide access panels to inspect coils.

15810 HUMIDIFIERS

A. In general, use steam grid dry bar type humidifiers with jacketed manifolds.

B. Building steam supply shall not be directly injected into airstream. Provide steam-to-steamexchanger type packaged humidifiers, or a steam fired steam boiler serving grid typehumidifiers. Omit manufacturer control package. Control humidifier with BAS.

C. Install humidifier at proper location in air system. Verify that design conditions of air athumidifier mounting point will allow humidifier to work properly.

15830 HEATING TERMINAL UNITS

A. Steam and hot water unit heaters, convectors, and finned tube radiation shall meet thefollowing guidelines.

1. Coils in all units are to be easily accessible for cleaning and removal.

2. All units should have individual automatic control.

3. Provide shut off valves on both sides so that all parts can be repaired or replaced.

15845 ENERGY RECOVERY UNITS

A. The use of energy recovery units is encouraged, providing the economics are based onacceptable payback.

1. The designer must exercise special care if these items are adapted to laboratory air

exhaust streams. The maintenance of such a system may not be possible.

15855 AIR HANDLING UNITS

A. Provide space at air handling units to allow coil and fan shaft replacement without majorbuilding revision.

B. Provide space at air handling units for filter replacement.


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C. HVAC units requiring large amounts of outside air shall include preheat coil per OA prior to

mixing with return air. Use steam distribution, non-freeze, heating coils with 1 tubes, wingor control air vertical tube coils for preheat.

D. Install ball valves with hose connection on supply and return piping at coils to allowventing and drainage.

E. Provide a light (interior) at all AHU with interior mounted motors. Light should be aweatherproof type.

F. Variable frequency drives are the preferred equipment for volume control.

G. Coil drying connections are required. See appendix.

15860 CENTRIFUGAL FANS

A. General

1. Fans shall meet Class III standard when this class is available for the fan size involved.

2. Housings shall be constructed of continuously welded steel to assure no air leakage.

3. Housing and bearing support shall be constructed of welded structural steel members toprevent vibration and rigidly support the shaft and bearings.

4. Fan wheel shall be of the non-overloading backward inclined centrifugal or air foil type.

a) Wheels shall be statically and dynamically balanced.

b) The wheel cone and fan inlet cone shall be carefully matched and shall have

precise running tolerances for maximum performance and operating efficiency.

5. Turned, precision-ground and polished steel shafts shall be sized so the first criticalspeed is at least 25% over the maximum operating speed for each pressure class.

6. Bearings shall be heavy duty grease lubricated, self aligning ball bearing or roller pillowblock type.

a) Bearings shall be selected for a minimum B-10 life of 200,000 hours at thespecified operating condition.

7. Fan performance shall be based on tests conducted in accordance with AMCA

Standard 210 test code for air moving devices.

a) Fans shall be licensed to bear the AMCA Certified Ratings Seal.

8. After assembly, each fan shall be given a final balance test at the specified operatingRPM to ensure smooth, vibrating-free operation and meet section 15240 requirements.

B. Variable frequency drives are the preferred equipment for volume control.


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15870 POWER VENTILATORS

A. Provide fan coatings and/or explosion-proof motors as required for service.

B. Install drip pans below power roof ventilators which do not have ductwork connected.

15880 AIR DISTRIBUTION

A. Maximum length of flexible duct at any one point shall be 3-0 for terminal boxes and 6-0for diffuser.

B. Provide air blenders in air handling units to mix outside air and return air to preventstratification.

C. Fume hood exhaust fans shall be installed on roof or near air discharge point from buildingin order that most of exhaust duct is under negative pressure.

D. Provide exhaust fans for each fume hood.

E. Do not locate exhaust fan discharge near building outside air intakes.

F. Provide exhausting of one custodial room to allow battery operated floor scrubber storageand recharging.

G. Drains from rooftop exhaust fans shall be run to the nearest roof drain (not drained onto theroofing material).

H. Utility set type fume hood exhaust fans are preferred. Provide special construction andlinings as required.

15885 AIR FILTRATION

A. The filtration system should provide a good habitable environment for the average person ina reasonably cost-effective manner when projected for the life of the system.

B. Low ventilation rates of VAV systems tend to concentrate contaminants and should beaddressed.

15890 DUCTWORK

A. All ductwork drawings shall be double line type.

B. Fume hoods require stainless steel or other non-corrosive metal ductwork. Verifyrequirements for each project.

C. Low-pressure ductwork shall have all joints sealed.

D. Medium and high-pressure ductwork shall be sealed and leak tested per SMACNAstandards. Seal class shall be specified.


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E. Outside air ducts subject to snow or water infiltration shall have drain pans piped to floordrain.

F. Duct thickness and construction shall be specified for all materials used.

G. Do not line fume hood exhaust ducts.

15910 DUCTWORK ACCESSORIES

A. Automatic dampers shall be a low leakage type with replaceable seals.

B. Fire dampers shall have an access panel for inspection and replacement of fusible links.Locations of all fire dampers shall be shown on drawings.

C. Access panels shall be insulated and quick opening.

D. Flexible connections shall not exceed 6 in width.

E. Manual dampers shall be provided at all trunk duct branches.

F. Manual dampers shall be provided with a locking type quadrant at exterior of duct.

G. Splitter dampers will not be allowed. Use 45 takeoffs.

15920 SOUND ATTENUATORS

A. Duct systems shall not transmit excessive airborne or radiated noise to occupied spaces.Fan selection, duct construction, air velocity and sound attenuators shall be evaluated toproduce acceptable noise levels.

B. Use sound attenuation to reduce room to room noise transmission as needed.

15930 AIR TERMINAL UNITS

A. The selection of air terminal units has great impact on the acceptability of the design.

1. The units should be pressure independent in operation.

2. The units must be acceptably quiet in operation.

15936 AIR INLETS AND OUTLETS

A. Perforated air supply diffusers shall not be allowed.

15950 CONTROLS

The Design Professional is solely responsible for the design of the HVAC controlsystems. During the design process, the Design Professional shall review controlstrategies with the Owner and develop control drawings to be included in the bidding


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documents. The installation of the controls systems will be included in the generalcontractor's bid. Siemens is the only approved BAS vendor.

Ensure pneumatic lines for controls include an independent support system and not incontact with any sharp or rough edges/materials.

Standard guide specifications are available from the University. Control wiring is to be

included in Division 17 specifications.

15990 TESTING, ADJUSTING, AND BALANCING

Contact UNI for instruction on whether UNI will issue separate purchase order or includein contract. If separate purchase order is issued, the Design Professional shall provideplans and specifications to use in obtaining quotes.

Div15 Mechanical

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Transcript of Div15 Mechanical