CHILLED WATER SYSTEM

NOTE: FINAL COPY: APRIL, 1988

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work in this Section includes the providing of labor, materials, equipment and services necessary for a complete and safe installation in accordance with the contract documents and all applicable codes and authorities having jurisdictions for the following

NOTE: INDICATE ALL WORK TO BE COVERED BY THIS SECTION. EDIT PORTIONS OF WORK INDICATED TO SUIT PROJECT REQUIREMENTS

1.	Piping.

2.	Pumps.

3.	Expansion Tank.

4.	Heat Exchanger.

2)	RELATED WORK AND REQUIREMENTS

A.	Requirements of GENERAL CONDITIONS, DIVISION NO. 1 and Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK apply to all work in this Section

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK OF THIS SECTION

B.	Related work in the following Sections.

1.	PIPING

2.	FAN COIL SYSTEMS

3.	INSULATION

4.	MOTORS

5.	MOTOR CONTROLLERS

6.	AUTOMATIC CONTROL SYSTEMS

7.	VIBRATION ISOLATION

8.	WATER TREATMENT

9.	THERMOMETERS GAUGES AND RECORDING INSTRUMENTS

10.	BALANCING AIR AND WATER SYSTEMS

11.	-----.

3)	REFERENCE STANDARDS

A.	Published Specifications' standards, tests or recommended methods of trade, industry or governmental organizations apply to work in this Section

B.	Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for additional reference standards

4)	QUALITY ASSURANCE

A.	Refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATION AND AIR CONDITIONING WORK for Guarantee and other Quality Assurance requirements

5)	SUBMITTALS

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY REFERENCES DIRECTLY AFFECTING WORK OF THIS SECTION

A.	Submit shop drawings for the following:

1.	Pumps, pump motors, pump curves, BHP, pump efficiency and MHP.

2.	Expansion tank, including supports, piping and wiring diagrams

3.	Heat exchangers.

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

NOTE: COORDINATE WITH CONDENSER WATER PUMP, MANUFACTURERS.

A.	Pumps:

NOTE: FOR OVER 50HP OR FOR QUALITY PROJECTS, USE THE FOLLOWING MANUFACTURERS

1.	Allis-Chalmer Mfg. Co., Bell and Gossett, Ingersoll-Rand Co., Peerless Pump Co., Worthington Corp., and Fairbanks & Morse

NOTE: FOR UNDER 50HP OR FOR SPECULATIVE TYPE PROJECTS, INCLUDE THE FOLLOWING MANUFACTURERS

2.	Aurora Pump Co., Pacific Pump Co., Weinman Pump Co., Taco and Thrus

B.	Heat Exchangers:

1.	Bell & Gossett Co., Patterson-Kelley Co. Inc. and Whitlock Mfg. Co

NOTE: FOR SPECULATIVE PROJECTS THE FOLLOWING MANUFACTURERS MAY BE INCLUDED

2.	Yula Corp., Taco Heater Co., and Sims Co.

NOTE: FOR SPECULATIVE PROJECTS THE FOLLOWING MANUFACTURERS MAY BE INCLUDED

C.	Expansion Tanks: Amtrol, Taco and Bell & Gossett Co.

2)	PIPING AND ACCESSORIES

A.	Refer to Section "PIPING" for supply and return, fill and make-up water and runouts from risers to units

B.	Runouts, as follows.

1.	Wrought copper fittings.

NOTE: CONSIDER USING SOLDERED JOINTS IN GENERAL. WORKING PRESSURE OF 95-5 SOLDERED JOINT TO 1 IN. IS 500 PSIG AT ABOUT 100 DEG F

JOINT

2.	Soldered joints.

3.	Silver brazed joints.

JOINT

4.	Connections to steel pipe shall be insulating coupling with steel jacket and threaded epoxy impregnated nylon insert, similar to Walter Vollett Co., Detroit, Michigan, V-Line

C.	Valves, fittings, flanges, joints and accessories as follows:

NOTE: FOR SYSTEM DESIGN PRESSURE UNDER 100 PSIG.

1.	Minimum 125 lb wsp or 200 lb wog except cast iron 150 wog and welded fittings as specified under Section "PIPING"

NOTE: FOR SYSTEM DESIGN PRESSURES TO 175 PSIG.

a.	From ----- floor to ----- floor provide 200 lb wsp or 200 lb wog

NOTE: FOR SYSTEM DESIGN PRESSURE TO 250 PSIG.

b.	----- floor and below provide 250 lb wsp or 300 lb. wog

NOTE: FOR SYSTEM DESIGN PRESSURE ABOVE 250 PSIG.

c.	----- floor and below provide 300 ANSI or 720 lb wog

3)	PUMPS

A.	Except where noted otherwise, pumps shall be single stage centrifugal pumps with flexible motor coupling, pump motor and enclosed bronze impeller. Pump and motor assembly shall be mounted on cast iron or rolled steel baseplate with raised lip rim and drain tappings. Motor shall be non-overloading over the entire range. Seals shall be as follows

NOTE: MECHANICAL SEALS PREFERRED.

SEAL

1.	Packed stuffing boxes with split bronze glands and brass studs

2.	Single, inside mounted, end face rubber bellows type mechanical seal with stainless steel springs, brass or stainless steel seal heads, babbitt filled carbon rotating washer and tungsten carbide stationary seat. Glands shall be bronze or stainless steel, water flush design to provide flush across face of mechanical seal. Provide by-pass line from pump discharge to flush gland. Coordinate construction and type with water treatment as specified in Section "WATER TREATMENT"

SEAL

NOTE: USE FOR SUCTION PRESSURES UP TO 150 PSIG.

MECHANICAL SEAL

a.	For suction pressures less than 150 psig, provide seals similar to John Crane Type 1

NOTE: USE WHERE SUCTION PRESSURE EXCEEDS 150 PSIG.

b.	For suction pressures 150 psig or greater, provide balanced construction seals, similar to John Crane Type 1B

MECHANICAL SEAL

B.	Pump and Motor capacities shall be minimum as noted, suitable for parallel operation and with motor designed to operate over entire capacity range of pump without exceeding horsepower rating. Pump shall be designed to operate at 25 percent beyond design capacity without exceeding breakoff point. Impellor diameter shall be maximum of 90 percent difference between maximum and minimum of published impellor diameter

C.	Pump Characteristics: Pump curve shall be continuous rise from maximum capacity to shutoff. Shutoff head approximately 10 percent greater than design head and operating at or near peak efficiency

D.	Alignment shall be by pump manufacturer at start-up, with dial indicator of plus or minus 0.002 inch accuracy. Certify in writing that alignment work has been performed by manufacturer's personnel and that pumps are operating in accordance with design requirements

E.	Pumps shall be tested and designed to withstand 1-1/2 times specified working pressure

F.	Horizontal split case double suction pump as follows:

PUMP

1.	Pump and flanges shall be 125 psig working pressure

2.	Pump and flanges shall be 250 psig working pressure

NOTE: FOR WORKING PRESSURES ABOVE 250 PSIG CHECK WITH PUMP MANUFACTURER AND REVIEW SPECIFICATION

PUMP

3.	Shaft shall be 416 stainless steel.

NOTE: FOR PACKED PUMPS.

SLEEVE

4.	Renewable shaft sleeves shall be 17 percent chrome stainless steel, heat treated and hardened or ceramic coated stainless steel. Hardness shall be minimum 600 Brinell

NOTE: FOR MECHANICAL SEALS.

5.	Renewable shaft sleeves shall be unhardened 416 stainless steel

SLEEVE

6.	Trim, shaft nut and stuffing box bushing shall be bronze. Casing and impeller wearing rings shall be renewable, dissimilar bronze of hardness to protect against galling.

7.	Flanged suction and discharge connection.

BEARI

8.	Bearings shall be ball, oil lubricated with oiler with rated life of 80,000 hours

9.	Bearings shall be ball, grease lubricated in moisture and dustproof housings with rated life of 80,000 hours. Cartridge bearings which cannot be lubricated will not be acceptable

BEARI

10.	Bearing brackets shall be provided with overflow holes to prevent flooding. Bearing housings shall be bolted and dowelled to bearing brackets. All metal flexible couplings, self-aligning type, guard similar to Waldron, Thomas, Falk and Fast, with removable sheet metal coupling guard. Pumps similar to Peerless Type A or AD (Series 5100) or Worthington Type LR

NOTE: AVOID THIS TYPE PUMP ON SUCH PROJECTS AS THEATERS, HOTELS, DORMITORIES, ETC. DUE TO INTEGRAL NOISE

G.	Vertical split case type pumps, as follows:

FLAN

1.	Pump and flanges shall be 125 psig working pressure.

2.	Pump and flanges shall be 250 psig working pressure.

NOTE: FOR WORKING PRESSURES ABOVE 250 PSIG CHECK WITH PUMP MANUFACTURER AND REVIEW SPECIFICATION

FLAN

3.	Steel shaft, bronze trim and renewable bronze casing wearing rings

NOTE: FOR PACKED PUMPS.

SLEEVE

4.	Renewable shaft sleeves shall be 17 percent chrome stainless steel, heat treated and hardened or ceramic coated stainless steel. Hardness: minimum 600 Brinell

NOTE: FOR MECHANICAL SEALS.

5.	Renewable shaft sleeves shall be unhardened 416 stainless steel

SLEEVE

6.	Ball bearings shall be grease lubricated, suitable for in service lubrication. Provide pumps similar to Peerless Type F or Worthington D-1000

4)	IN-LINE CIRCULATORS

A.	Vertical split, flanged, cast iron bronze fitted, pumps with enclosed centrifugal type bronze impeller rated for 125 psig working pressure

B.	Mechanical seals: Coordinate seal construction with water treatment as specified in Section "WATER TREATMENT"

C.	Circulators with coupling connected and bolted to oil lubricated sleeve bearing motor, similar to Bell & Gossett Booster Pump or Series 60

5)	EXPANSION TANK

TYPE

A.	Open type:

1.	Welded steel open tank, rated for 15 psig working pressure, galvanized after fabrication and constructed in accordance with the ASME Code for Unfired Pressure Vessels, of a size, capacity and arrangement, as noted. Tank complete with connections, tappings, tank complete with full height gauge glass with shutoff valves structural steel supports and drain cock

HOLE

a.	Gasketed handhole.

b.	Gasketed manhole.

HOLE

NOTE: USE WHERE ALARM DESIRED AND COORDINATE WITH ELECTRICAL DEPARTMENT. USE TYPE 63 SWITCH FOR WORKING PRESSURES UP TO 50 PSIG

2.	High and low water alarm switches to actuate high and low water alarm similar to McDonnell Miller Type 63

3.	Float operated valve to maintain water level in tank, similar to McDonnell Miller No. 25A

B.	Closed Type:

1.	Welded steel closed tank, rated for noted working pressure, galvanized after fabrication and constructed in accordance with ASME Code for Unfired Pressure Vessels and ASME stamped, of a size, capacity and arrangement, as noted. Provide connections, tappings, full height protected, gauge glass with shutoff valves, structural steel supports, relief valves and drain cock

HOLE

a.	Gasketed handhole.

b.	Gasketed manhole.

HOLE

NOTE: USE WHERE ALARM DESIRED AND COORDINATE WITH ELECTRICAL DEPARTMENT. USE TYPE 63 SWITCH FOR WORKING PRESSURE UP TO 50 PSIG AND TYPE 93 SWITCH FOR WORKING PRESSURES FROM 51 PSIG

2.	High and low water alarm switches to actuate high and low water alarm.

LARM

a.	Alarm similar to McDonnell Miller Type 63.

b.	Alarm similar to McDonnell Miller Type 93.

LARM

NOTE: COORDINATE WITH EXPANSION TANK DETAIL

3.	Pressure reducing and relief valves, similar to Bell & Gossett. Reducing valve shall be with built in strainer and check valve. ASME valve shall be diaphragm type with test lever and drain

4.	Make-up feeder tank and pump assembly: Tank shall be as specified for expansion tank with a working pressure of 15 psig. For systems with automatic water feed, float operated valve shall maintain water level similar to McDonnell Miller No. 25A

5.	Glycol transfer-pump shall be in-line, vertical split, centrifugal type, similar to Bell & Gossett Booster Pump

NOTE: GLYCOL SYSTEMS SHOULD BE FILLED MANUALLY. AUTOMATIC LEVEL CONTROLLER IS NOT NECESSARY

6.	Level controller shall operate make-up water pumps and solenoid valve to maintain water level, similar to McDonnell Miller No. 150. This is not required for glycol system

NOTE: CHECK DUTY AND SELECT PROPER PUMP TYPE.

MAKE

7.	Make-up water pumps shall be vertical split, close coupled, centrifugal type, similar to Peerless Type C

8.	Make-up water pumps shall be close coupled, turbine type, bronze fitted, with mechanical seals, replaceable channel rings and in-line suction and discharge openings in casings, similar to Worthington Type TC

NOTE: USE OF DIAPHRAGM TYPE EXPANSION TANKS SHOULD BE LIMITED TO SYSTEM PRESSURES OF 100 PSIG TEMPERATURES OF 200 DEG F AND BUILDING SIZES UP TO 400,000 GROSS SQ. FT

MAKE

C.	Closed welded steel tank diaphragm type, rated for 125 psig working pressure, galvanized after fabrication shall be constructed in accordance with the ASME Code for Unfired Pressure Vessels, ASME stamped and of a size, capacity and arrangement, as noted, with connections, tappings and prepressurized diaphragm suitable for 240 deg. F operating temperature. Air shall be precharged to pressure as noted on the drawings. Tank with integral base mount or factory furnished saddles. Tank similar to Amtrol AX or L Series Extrol Expansion Tank.

1.	Make-up feeder tank and pump assembly as follows:

a.	Tank materials and ratings as specified for expansion tank with a working pressure 15 psig. For systems with automatic water feed, float operated valve shall maintain water level similar to McDonnell Miller No. 25A

b.	In-line, vertical split, centrifugal type, glycol transfer pump similar to Bell & Gossett Booster Pump

NOTE: GLYCOL SYSTEMS SHOULD BE FILLED MANUALLY. AUTOMATIC PUMP CONTROL IS NOT NECESSARY

c.	High and low pressure switches to operate make-up water pump and solenoid valve to maintain water level in expansion tank and to sound alarm

TYPE

NOTE: CHECK DUTY AND SELECT PROPER PUMP TYPE.

MAKE

D.	Make-up water pumps shall be vertical split, close coupled centrifugal type, similar to Peerless Type C

E.	Make-up water pumps shall be close coupled, turbine type, bronze fitted with mechanical seals, replaceable channel rings, and in-line suction discharge openings in casings similar to Worthington Type TC

MAKE

6)	HEAT EXCHANGER

A.	Shell and tube type heat exchanger, ASME stamped, with flanged dished head at end of shell, flanged end connections, 3/4 inch OD NO 18 BWG copper tubes, pressure relief valves in accordance with ASME and supports. Supports shall be welded stand or structural base

NOTE: COORDINATE WITH DESIGNER'S SELECTION.

TUBES

1.	U-tube configuration.

2.	Straight tube configuration; channel heads with removable cover plates at both ends

TUBES

3.	Design working pressures:

TUB

a.	Tubes shall be 150 psig.

b.	Tubes shall be 200 psig.

TUB

c.	Shell shall be 150 psig.

NOTE: THIS FOULING FACTOR TYPICAL FOR TREATED WATER IN CLOSED SYSTEMS

4.	Fouling Factor shall be 0.0005 each side; 0.001 total.

NOTE: FOR U-TUBE

MODEL

5.	Similar to Patterson-Kelley "DW".

NOTE: FOR STRAIGHT TUBE.

6.	Similar to Patterson-Kelley "O".

MODEL

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Expansion Tank: Make-up water connections from valved outlet provided under Plumbing work

NOTE: FOR RELIEF VALVES FOR CLOSED EXPANSION TANK WITHOUT MAKE-UP WATER PUMP

B.	Pipe relief valve to spill over floor drain.

C.	Provide 3 elbow type swing joints on supply and return connection to equipment, piping systems and all risers

D.	Dirt pocket and draining systems. Provide full size of riser and 12 inches long at bottom of each riser and where noted

NOTE: USE FOR PROJECTS WHERE PRESSURES ARE LESS THAN 100 PSIG.

1.	Piping 100 psig or less: provide 3/4 inch hose gate valves, 125 lb wsp or 200 lb wog. with capped hose connection

NOTE: USE WHERE PRESSURES ARE MORE THAN 100 PSIG.

2.	Piping over 100 psig: provide 3/4 inch bronze globe valve, 250 wsp or 400 lb wog, or 3/4 inch ball valve 500 lb wog, or 3/4 inch glob (plug disc) valve 600 lb ANSI, piped to drain or slop sink

3.	Provide shutoff valves in each riser runout.