94-TMSS-02-R0

TRANSMISSION MATERIALS STANDARD SPECIFICATION

94-TMSS-02, Rev. 0

TABLE OF CONTENTS

1.0

SCOPE

2.0

CROSS-REFERENCES

3.0

APPLICABLE CODES AND STANDARDS

4.0

DEFINITIONS

5.0

DESIGN AND CONSTRUCTION REQUIREMENTS 5.1 5.2 5.3 5.4

General Requirements Design Criteria Ratings Manufacture

6.0

TESTS

7.0

DATA SCHEDULE

94TMSS02R0/MHS

Date of Approval: June 23, 2008

PAGE NO. 2 OF 24


1.0

94-TMSS-02, Rev. 0

SCOPE This Transmission Material Standard Specification (TMSS) specifies the minimum technical requirements for design, engineering, manufacture, inspection; testing and performance of Drinking-Water Coolers intended to be used in the system of Saudi Electricity Company (SEC), Saudi Arabia.

2.0

CROSS REFERENCES This Material Standard Specification shall be read in conjunction with the latest revision of SEC General Specification No. 01-TMSS-01, titled "General Requirements for All Equipment/Materials" which shall be considered as an integral part of this TMSS. This TMSS shall also be read in conjunction with SEC Purchase Order or Contract Schedules for project, as applicable.

3.0

APPLICABLE CODES AND STANDARDS The latest revision/amendments of the following Codes and Standards shall be applicable for the equipment/material covered in this TMSS. In case of conflict, the vendor/manufacturer may propose equipment/material conforming to one group of Industry Codes and Standards quoted hereunder without jeopardizing the requirements of this TMSS. 3.1

SASO 415

Drinking Water Coolers-Arabic Version

3.2

ARI 1010

Self-Contained, Mechanically-Refrigerated Drinking-Water Coolers

3.3

ASHRAE 18

Methods of Testing for Rating Drinking-Water Coolers with SelfContained Mechanical Refrigeration Systems

3.4

UL 399

Standard for Safety Drinking Water Coolers

3.5

UL 1995

Standard for Safety Heating and Cooling Equipment

3.6

ASTM A240

Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

94TMSS02R0/MHS


PAGE NO. 3 OF 24


4.0

94-TMSS-02, Rev. 0

DEFINITIONS 4.1

Remote-Type Drinking-Water Cooler A water cooler which has the primary function of cooling potable water for delivery to remotely-installed drinking fountains, etc. However, such remotely-installed dispensing means are not considered part of this water cooler.

4.2

Individual (Unitary) Drinking-Water Cooler A water cooler which has the primary function of cooling potable water and also provides for dispensing such water by integral means. 4.2.1

Bubbler-Type Pressure Water Coolers A pressure water cooler which utilizes a valve to control the flow of water as a projected stream from a bubbler so that the water may be consumed without utilizing glasses or cups.

4.2.2

Hot and Cold-Type Water Coolers A pressure water cooler which, in addition to the primary function of cooling and dispensing potable cold water, includes means for heating and dispensing potable hot water.

4.2.3

Bottle-Type Water Coolers A water cooler which employs a bottle or reservoir for storing the supply of water to be cooled and which utilizes a faucet or similar means for filling glasses, cups or other containers.

94TMSS02R0/MHS


PAGE NO. 4 OF 24


5.0

94-TMSS-02, Rev. 0

DESIGN AND CONSTRUCTION REQUIREMENTS 5.1

General Requirements 5.1.1

Design and Manufacture Drinking-water coolers shall be of manufacturer's standard designed and manufactured equipment with factory-installed accessories for a complete and fully automatic operational system.

5.1.2

Type Water cooler shall be designed either remote-type cooler or individual (unitary) cooler. Unitary cooler shall either be of bubbler-type or hot and cold-type or bottle-type.

5.1.3

Product Listing All water coolers referred to in this specification shall be listed under ETL in accordance with UL 1995 and UL 399 for Remote Type and Unitary DrinkingWater Coolers respectively. All coolers shall carry UL stamp of approval.

5.1.4

Refrigerant The unit shall be fully charged with "ozone safe" refrigerant R134a.

5.1.5

5.2

Miscellaneous: a.

All cooler enclosures shall be properly bonded to the grounding system.

b.

Each compressor shall be provided with vibration isolation.

c.

All coolers, except for bottle-type, shall be provided with a minimum inlet water pressure of 276 kPa for satisfactory performance.

Design Criteria All coolers shall be designed to operate satisfactorily at high ambient conditions as high as 50°C and to produce a maximum chilled water temperature of 10°C.

94TMSS02R0/MHS


PAGE NO. 5 OF 24


5.3

94-TMSS-02, Rev. 0

Ratings 5.3.1

Published Ratings Ratings of any representative production water cooler shall have a capacity not less 95% of its published capacity rating in accordance with ARI 1010.

5.3.2

Standard Ratings Ratings shall be verified by tests in accordance with ASHRAE 18.

5.4

Manufacture 5.4.1

Remote-Type Drinking-Water Cooler a.

General Remote drinking-water coolers shall be of manufacturer's standard designed and manufactured equipment consisting of refrigeration unit, chilled water reservoir, recirculating pump, make-up water filtration, built-in sterilizer, phosphate feeder and complete controls for fully automatic operational system.

94TMSS02R0/MHS

i.

The cooler shall be self-contained mechanically-refrigerated system, factory-assembled, prewired, prepiped and precharged with refrigerant and compressor oil; and ready for field connections to drinking fountains, all housed as one package.

ii.

The unit shall be constructed of a rugged, rust-proofed and enameled steel (18 gauge) cabinet mounted on a heavy angle iron frame. Housing panels shall be easily removable for complete access to all components without tools.

iii.

The unit shall be configured to provide inlet/outlet piping connections for make-up water, chilled water discharge and chilled water return.

iv.

The unit shall be provided with inlet/outlet air openings (hooked up to ductwork) for condenser cooling i.e. by introducing fresh air then venting out the hot air off the condenser through ductwork to the atmosphere.


PAGE NO. 6 OF 24


b.

c.

d.

94TMSS02R0/MHS

94-TMSS-02, Rev. 0

Refrigeration Unit i.

The unit shall consist of high efficient, lifetime lubricated hermetic compressor, refrigerant receiver and air-cooled condenser with capability to remove heat load at high ambient conditions.

ii.

The condenser shall be supplied with thermostat, low/high pressurestat, pump down solenoid valves, expansion valve, refrigeration gauges, oil pressure switch, sight glass and dehydrator.

iii.

Condenser coil shall be constructed of aluminum fin bonded to seamless copper tube and shall be epoxy-sprayed for corrosion protection.

Chilled Water Reservoir i.

The cooling tank shall be constructed of 316L stainless steel tested at 1724 kPa and designed for 862 kPa working pressure. Tank plate wall thickness shall be as per manufacturer's standard.

ii.

The tank shall be equipped with immersion type cooling coils constructed of 316L stainless steel seamless pipe having a minimum wall thickness of 1.524 mm. Shell and tube evaporators or open tanks with float valves are not acceptable.

iii.

The storage tank shall be supplied with air vent, drain connection and insulated with closed cell thermo-elastomer with U-factor of 2 0.048 W/m °C.

Recirculating Pump i.

The pump shall be stainless steel centrifugal type designed for 862 kPa working pressure mounted on rubber pad over a stainless steel condensation tray, with drain.

ii.

The pump shall be supplied with manual on/off switch.

iii.

All piping and fitting shall be hard-drawn seamless type K copper and insulated with closed-cell thermo-elastomer with U-factor of 2 0.048 W/m °C.


PAGE NO. 7 OF 24


iv.

e.

94-TMSS-02, Rev. 0

Piping shall be equipped with temperature sensor on discharge side of the pump, unions, service valves, manual bypass valve and drain.

Make-Up Water Filtration i.

General Water filters shall be provided to the water treatment module performing in accordance with U.S. Public Health Standards. Filter capacity shall be as per manufacturer's standard correspond to unit requirement. Vendor to provide at least two (2) spare filters of each type for every cooler's required capacity.

ii.

iii.

•

Filter assembly shall be provided with unions and shut-off valves at the inlet and outlet for quicker disconnection from plumbing or recharging. Backwash and manual bypass valves shall also be supplied.

•

Filter housing shall be equipped with cock or cleanout port for water draining.

•

Filter housing shall be provided with removable top for sediment filter replacement or carbon recharging without using any tool and without disconnecting the plumbing.

Combined Sediment/Activated Carbon Water Filters •

Filter shall be dual media installed inside a single housing for removal of sediment, taste, odors and other harmful chemicals.

•

Filter housing shall be constructed of a polished 316L stainless steel (12 gauge) designed for a working pressure of 862 kPa. No plastic part will be acceptable.

Prefilters and Activated Carbon Water Filters •

Prefilters Prefilter shall be a natural fiber filter sheets for removal of suspended matter down to 5 microns. Non biodegradable elements are not acceptable.

94TMSS02R0/MHS


PAGE NO. 8 OF 24


94-TMSS-02, Rev. 0

Filter housing shall be as mentioned in item 5.4.1 (e.ii) above. •

f.

g.

94TMSS02R0/MHS

Activated Carbon Filters *

Filter elements shall be composed of granular activated carbon where all taste, odors and other organic chemicals are removed.

*

Filter housing shall be fiberglass reinforced polyester resin , one-piece, totally seamless construction with no welded seams, cemented joints or special tank lining which can corrode, electrolyze, give way and leak. Inside finish shall smooth to avoid dirt retention

*

Filter housing shall be designed to operate at maximum pressure of 862 kPa and shall be equipped with air vent.

Built-In Ultraviolet (UV) Sterilizer i.

UV sterilizer shall be fabricated of 316L stainless steel and shall be rated for treatment of water-borne bacteria, algae, spores, viruses and cysts. Capacity shall be as per manufacturer's standard correspond to unit requirement.

ii.

Sterilizer shall be horizontally mounted with a removable quartz sleeves for maintenance.

iii.

Sterilizer shall have water flow regulator to ensure an exposure of 2 at least 30,000 microwatt-sec/cm .

Phosphate Feeder i.

Phosphate feeder shall be constructed of a transparent plastic body designed for 862 kPa working pressure complete with shutoff valves and drain valve.

ii.

The feeder shall be rated to provide solution flowrate sufficient enough to protect plumbing in inhibiting lime scale formation, preventing corrosion or rusting, etc. Capacity shall be as per manufacturer's standard correspond to unit requirement.


PAGE NO. 9 OF 24


iii.

h.

94-TMSS-02, Rev. 0

Vendor to provide phosphate for least one (1) year of continuous operation.

Controls and Monitor Panel The cooler shall be provided with an integral control panel suitable for thermostat control (adjustable range from 4.45° to 32°C ±0.83°C), freezestat and factory-set thermostatic expansion valve. Control panel shall have standard features to perform the following functions: i.

Purity Meter To monitor water quality, signaling when filter or UV sterilizer requires maintenance.

ii.

UV Sterilizer Monitor Light To indicate UV energy status, signaling when sterilizer needs servicing.

iii.

Differential Pressure Switch To show when filter element needs changing and set for maximum pressure drop of 69 kPa.

iv.

Digital Thermometer To display discharge water temperatures both in °F and °C.

v.

Cooler Capacity The following information, as shown in Tables 1 and 2, is only to provide the basic cooler capacity based on 32°C ambient, 27°C inlet and 7.22°C outlet, connections, approximate dimensions, etc. for sizing purposes and shall not preclude other sizes which satisfy all the requirements of this specification:

94TMSS02R0/MHS


PAGE NO. 10 OF 24

94-TMSS-02, Rev. 0


Table 1 - Cooler Capacity and Dimensions

94TMSS02R0/MHS

Cooling Cap., watts

Storage Capacity, liters

293

1

Person Served at 1 liter./day

Chilled Water Conn., mm

7.57

50

10

750x175x600

341

18.93

130

10

750x300x600

495

37.85

200

15

800x475x1350

938

53.00

300

15

875x550x1350

1172

94.63

400

20

1000x675x1350

1758

151.40

600

20

1075x675x1750

2344

189.25

800

20

1075x675x2000

4103

227.10

1400

20

1125x750x2000

4982

378.50

1700

25

2625x750x1500

8206

605.6

2800

25

2925x875x1750


Dimensions L x W x H, mm

PAGE NO. 11 OF 24

94-TMSS-02, Rev. 0


Table 2 - Cooler Electrical and Piping Allowance Data Cooling Cap., watts

Power Supply V/Ph/Hz

Compressor Motor, watts

Pump Motor/Cap., watts/lps

293

127/1/60

125

341

127 or 208/1/60

495

2

Piping Allowance

meter

IPS size,mm

None

3.05

6

150

None

6.10

6

127 or 208/1/60

187

30 / 0.189

18.30

15

938

127 or 208/1/60

250

30 / 0.189

21.30

15

1172

127 or 208/1/60

373

150 / 0.378

30.50

15

1758

127 or 208/1/60

560

250 / 0.505

45.70

15

2344

127 or 208/1/60

746

250 / 0.505

58.00

20

4103

208 or 380/3/60

1119

250 / 0.505

91.50

20

4982

208 or 380/3/60

1492

373 / 0.95

106.70

25

8206

208 or 380/3/60

2238

373 / 0.95

176.80

25

1

Values are applicable for typical office building only. For buildings with heavy usage such as clinics, schools, etc., reduce the indicated values by 50% to allow for 2 liters/day per person. For high ambient areas with temperatures regularly above 38°C or with incoming water temperature from 27°C to 38°C, multiply people served by 0.75. If make-up water exceeds 38°C, consult for manufacturer's recommendation. 2

Values include extra capacity to handle heat loss of insulated piping in the circulating loop up to the length shown. For piping in excess of this allowance, reduce population served by 1.0 people per 0.305 meter of additional piping and the required power for pumping shall also be resized accordingly.

94TMSS02R0/MHS


PAGE NO. 12 OF 24


5.4.2

94-TMSS-02, Rev. 0

Individual Drinking-Water Coolers a.

General Individual drinking-water cooler shall be of manufacturer's standard designed and manufactured equipment consisting of refrigeration system, cooling tank and coil, thermostat, etc. complete for fully automatic operational system.

b.

i.

The unit shall be free-standing with removable panel for easy access for servicing and replacement.

ii.

The unit shall have a power supply of 127 volt/1-phase /60 Hz with a 1.80-meter heavy-duty 3-wire electrical cord and plug. All connections shall be enclosed in a moisture resistant box to prevent short circuiting in the event of water leaks or spillage.

iii.

The unit, except for bottle-type cooler, shall be provided with non-clogging stainless steel drain and quick disconnect water connections for easy removal of the entire cooling package.

Bubbler-Type Water Cooler i.

Cabinet Cabinet and top shall be constructed of #304 stainless steel, gauge 18 with satin finish and anti-splash ridge.

ii.

Bubbler Shall be push-button bubbler constructed of solid brass, chrome plated, anti-squirt design with built-in automatic stream regulator to assure constant stream height under varying line pressures from 138 kPa to 862 kPa. Stream regulation shall be easily adjustable with screw driver by simply removing the push-button cap.

94TMSS02R0/MHS


PAGE NO. 13 OF 24


iii.

94-TMSS-02, Rev. 0

Tank and Evaporator The cooling tank and immersion cooling coil shall be constructed of 316L stainless steel, with a minimum storage capacity of 7.57 liters and designed for 862 kPa working pressure. Shell and tube evaporators or open tanks with float valves are not acceptable. The storage tank shall be supplied with air vent, drain connection and insulated with poured urethane. The tank shall be housed in an insulated, rust-proof and vapor proof stainless steel container.

iv.

Refrigeration System The system shall be provided with a 249-watt high efficiency hermetically sealed compressor having a minimum cooling capacity of 38 liters/hour, aluminum finned, copper air-cooled condenser epoxy-sprayed to prevent corrosion. Oversized condenser shall be designed to operate at high ambient conditions.

v.

Built-in Water Filter Purifier Filter shall be a combined sediment/activated carbon type as described in item 5.4.1 (e.ii) above. Filter capacity shall be rated at 7.57 liters/min. Vendor to provide a least five (5) dozens spare filters.

vi.

Chilled Water Controls The cooler shall be provided with adjustable and corrosion-proof thermostat and thermal overload relay.

c.

94TMSS02R0/MHS

Hot and Cold-Type Water Cooler i.

Same construction and features as in bubbler-type water cooler but with additional insulated hot water dispenser that can deliver up to 40 cups of 88°C water per hour.

ii.

Hot water (HW) dispenser shall be installed inside the cooler cabinet with 1.25-liter copper tank, heating element, expansion chamber, self-closing valve, air vent and drain.


PAGE NO. 14 OF 24


d.

94TMSS02R0/MHS

94-TMSS-02, Rev. 0

iii.

HW dispenser shall be equipped with snap-action thermostat adjustable from 71°C to 93°C.

iv.

HW dispenser shall be provided with push lever with auto return to "off", solid brass-chrome plated goose neck glass filler and stream straightener for non-splash action.

Bottle-Type Water Cooler i.

Bottle-type water cooler shall be designed to dispense hot and cold water, with 20-liter plastic water bottle. Vendor to provide at least two (2) bottles packed in an individual dustproof carton.

ii.

The cooler shall have a fully drainable stainless steel 3.5 liter cooling reservoir, sandalwood acrylic finish with woodgrain vinyl front panel.

iii.

The cooler shall be equipped with food grade silicone gasket around the bottle to keep out of contaminants.

iv.

The cooler shall be equipped with a removable stainless steel overflow tray.

v.

The unit shall have sealed static-cooled condenser, 50-watt compressor motor and heater. Controls shall be as per manufacturer standards.

vi.

The unit shall be capable of dispensing 4 liters/hour cold water and up to 40 cups of hot water per hour.


PAGE NO. 15 OF 24


5.4.3

Nameplate a.

b.

6.0

94-TMSS-02, Rev. 0

Each equipment shall be equipped with a permanently marked stainless steel nameplate in English to include the following minimum information: i.

Manufacturer's Name

ii.

Model Number

iii.

Serial Number

iv.

Year of Manufacture

v.

Cooling Capacity, watts or liters/hour

vi.

Unit Input Power, watts

vii.

Power Supply, V/Ph/ Hz

viii.

Full Load Current, Amps

ix.

Locked Rotor Current, Amps

x.

Unit Gross Weight, kg.

xi.

94-TMSS-02 Rev. 0

The nameplate shall be fastened to the equipment by stainless steel screws or rivets.

TESTS All water coolers shall be tested in compliance with the applicable requirements of UL 399, UL 1995 and the following performance tests as prescribed in ARI 1010 on any representative sample: 6.1

Maximum Operating Condition Tests

6.2

Insulation Effectiveness Test

6.3

High Voltage and Low Voltage Tests

94TMSS02R0/MHS


PAGE NO. 16 OF 24


94-TMSS-02, Rev. 0

DWG*: 94TMSS02.01.00

94TMSS02R0/MHS


PAGE NO. 17 OF 24


94-TMSS-02, Rev. 0

DWG*: 94TMSS02.02.00

94TMSS02R0/MHS


PAGE NO. 18 OF 24


94-TMSS-02, Rev. 0

DWG*: 94TMSS02.03.00

94TMSS02R0/MHS


PAGE NO. 19 OF 24

94-TMSS-02, Rev. 0


7.0

DATA SCHEDULE

DRINKING-WATER COOLERS SEC Inquiry No.

Date:

SEC Purchase Order No. or Contract No.

Date:

SEC PTS No./Project Title with J.O. No. REFERENCE SECTION NO. 5.2

DESCRIPTION

'A'

'B'

'C'

DESIGN CRITERIA Design Ambient Temperature (°C) Inlet Water Press. to the Cooler (kPa)

5.3

(as applicable)

RATINGS Cooler Mfg./Model Number Unit Power Input (watts) Min. Circuit Current (Amps) Power Supply Voltage (V) Frequency (Hz) Phase (Ph) Control Voltage (V) Frequency (Hz) Phase (Ph)

'A' 'B'

-

'C'

-

SEC SPECIFIED DATA/PARAMETERS BIDDER/SUPPLIER/VENDOR/CONTRACTOR PROPOSED DATA/PARAMETERS REMARKS SUPPORTING THE PROPOSED DEVIATION IN COLUMN 'B'

94TMSS02R0/MHS


PAGE NO. 20 OF 24

94-TMSS-02, Rev. 0


7.0

DATA SCHEDULE

DRINKING-WATER COOLERS REFERENCE SECTION NO.

DESCRIPTION

'A'

'B'

'C'

5.3 (Continued) Cooling Capacity (watts or liters/hr) Make-Up Water Temperature (°C) Water Discharge Temperature (°C) Compressor Manufacturer/Model No. Motor Power (watts) Power Supply Voltage (V) Frequency (Hz) Phase (Ph) Comp. Motor FLA/LRA (Amps) Compressor Motor Speed (RPM) Condenser Fan and Motor (as applicable) Manufacturer/Model Number Motor Power, (watts) Power Supply Voltage (V) Frequency (Hz) Phase (Ph) Fan Motor FLA/LRA (Amps) Fan Speed (RPM)

94TMSS02R0/MHS


PAGE NO. 21 OF 24

94-TMSS-02, Rev. 0


7.0

DATA SCHEDULE


DESCRIPTION

'A'

'B'

'C'

5.3 (Continued) Chilled Water Reservoir Capacity (liters) Working Pressure (kPa) Recirculating Pump (as applicable) Manufacturer/Model Number Capacity (liters/min) Head (kPa) Motor Power (watts) Power Supply Voltage (V) Frequency (Hz) Phase (Ph) Pump Motor FLA/LRA (Amps) Pump Speed (RPM) Make-Up Water Filtration (as applicable) Combined Sediment/Activated Carbon Filter Manufacturer/Model Number Capacity (liters/min) Quantity

94TMSS02R0/MHS


PAGE NO. 22 OF 24

94-TMSS-02, Rev. 0


7.0

DATA SCHEDULE


DESCRIPTION

'A'

'B'

'C'

5.3 (Continued) Prefilter Manufacturer/Model Number Capacity (liters/min) Quantity Activated Carbon Filter Manufacturer/Model Number Capacity (liters/min) Quantity UV Sterilizer (as applicable) Manufacturer/Model No. Capacity (liters/min) No. of Lamps Watts Power Supply Voltage (V) Frequency (Hz) Phase (Ph) Phosphate Feeder (as applicable) Manufacturer/Model No. Capacity (liters) Solution Flowrate (liters/min)

94TMSS02R0/MHS


PAGE NO. 23 OF 24


7.0

94-TMSS-02, Rev. 0

DATA SCHEDULE

DRINKING-WATER COOLERS A.

ADDITIONAL TECHNICAL INFORMATION OR FEATURES SPECIFIED BY BY SEC:

B.

ADDITIONAL SUPPLEMENTARY DATA OR FEATURES PROPOSED BY BIDDER/ VENDOR/SUPPLIER/CONTRACTOR :

C.

OTHER PARTICULARS TO BE FILLED UP BY BIDDER/VENDOR/SUPPLIER/ CONTRACTOR : Manufacturer of Material/Equipment

Vendor/Supplier/ Contractor

Name of the Company Location and Office Address

Name and Signature of Authorized Representative and Date Official Seal/Stamp of the Company

94TMSS02R0/MHS


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94-TMSS-02-R0

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