46 07 13 - PACKAGED WATER TREATMENT EQUIPMENT.pdf

MINISTRY OF HOUSING Western Sector Projects Sitework & Infrastructure OMRANIA and ASSOCIATES Project Specification

PACKAGED WATER TREATMENT EQUIPMENT SECTION 46 07 13 - 1

SECTION 46 07 13

PACKAGED WATER TREATMENT EQUIPMENT PART 1: GENERAL

1.01 SECTION INCLUDES

A. Water Treatment Plant and associated equipment.

B. The Contractor shall be fully responsible for the final design, as indicated diagram-matically on the Drawings to supply a complete system to the approval of the Engineer.

1.02 RELATED SECTIONS

A. Section 23 05 13.13 Common Work Results for HVAC.

B. Section 23 05 13 Common Motor Requirements for HVAC Equipment.

C. Section 25 05 00 Building Management System and Automatic Controls.

D. Section 23 05 53 Identification for HVAC Piping and Equipment.

E. Section 22 05 13 Motor Requirements for Plumbing Equipment.

F. Section 22 11 13 Facility Water Distribution Piping.

G. Section 22 05 23 General-Duty Valves for Plumbing Piping.

H. Section 22 05 29 Hangers and Supports for Plumbing Piping and Equipment.

1.03 SUBMITTALS

A. Comply with Section 01 33 00.

B. Shop drawings, including, but not limited to the following:

1. Refer to Section 23 05 13.13.

2. General arrangements/installation drawings.

3. P & I diagram.

4. Electrical panel schematic wiring diagram.

C. Calculations: Refer to Section 23 05 13.13.

D. Equipment details and method of installation.

E. Operation and Maintenance Manual: Three (3) Operation and Maintenance manuals in Arabic and English languages.

1.04 QUALITY ASSURANCE

A. Manufacturers: Firms regularly engaged in the manufacture of Water Treatment Plants whose product has proved satisfactory in similar service for not less than 10 years.

B. Installer: Firms engaged for at least 10 years in the installation of plants of similar type, quality and scope as required for this project.



C. Perform work in accordance with the standards of the appropriate local authority having jurisdiction.

D. Submit proof of license to perform the work as issued by the local authority having jurisdiction.

1.05 OPERATIONS AND MAINTENANCE DATA

A. Comply with Sections 01 78 23 and 23 05 13.13.

1.06 WARRANTY


B. Operate and maintain the Water Treatment Plant for a trial period of one (1) month. During this period, all parts of the plant shall be examined for function, strength, water tightness and sound performance. If any part installed or constructed by the Contractor is found faulty on testing, the part shall be rectified or replaced by new and examined again until the Engineer approves all works. All equipment, chemicals, spare parts, personnel and other requirements for testing, operating and maintaining the plant during the trial period shall be provided by the Contractor.

1.07 AMBIENT CONDITIONS

A. All equipments shall be designed to withstand local ambient conditions. PART 2: PRODUCTS 2.01 ACCEPTABLE MANUFACTURERS

Not Used.

2.02 PROCESS DESCRIPTION

A. The Plant shall be designed to produce disinfected potable water with a TDS not more than 300 mg/l and an irrigation water quality with TDS of 800 mg/l.

B. Raw water shall be extracted from the raw water storage tank filled from the well. Boosted raw water will then be fed to the pre-treatment filtration.

C. Water shall pass through media filters using sand and anthracite with a SDI less than 3.

D. Dosing of filtered water by proprietary sequestrant shall then take place to inhibit the formation of fouling scales in the reject of the R.O. membrane by the inhibition of the crystalline formation.

E. Water shall then pass through 5-micron cartridge filters to protect the R.O. membrane.

F. Chemically conditioned water shall then be pressurized by high pressure centrifugal pump and passed to the reverse osmosis module for production of low total dissolved solid product water by reverse osmosis and discharge of concentrate reject brine water to reject brine tank.

G. Product water shall be treated with chlorine to acceptable levels for drinking water.

2.03 BASIS OF DESIGN



A. The final water produced from the treatment plant shall comply with the water standards specified. Blending of filtered raw water with the R.O. product shall be permitted to give the required final water quality.

B. The Plant shall be equipped with all interconnecting pipework and measuring gauges, together with all appropriate electrical equipment.

C. The following treatment plant characteristics are envisaged, related to the ultimate water consumption:

1. Water Consumption: 930 m/day.

2. Water Use: Potable/Irrigation.

3. Raw Water Quality: To be analyzed by the Contractor.

4. Source Water Supply: From deep well to be determined by the Contractor.

5. Treated water quality: TDS not more than 300 mg/l for potable water and 800 mg/l for irrigation.

6. R.O. recovery: 75% minimum.

2.04 DESCRIPTION OF TECHNICAL PARTS

A. Pre-chlorination Dosing System:

1. Reagent, Concentration: Sodium hypochlorite, 12%.

2. Pump Type: Positive displacement.

3. Duty: 0 6.4 LPH at 6.9 bar.

4. Control: Manually adjusted control for stroke length and automatic start-up with the filter feed pump.

5. Fittings: Foot valve with strainer, injection check valve, suction and injection tubing.

6. Tank Capacity: 500 liters.

7. Tank Material: High-density polyethylene.

8. 1/3 HP motor solution mixer mounted on tank.

B. Anti-scalant Dosing System:

1. Anti-scalant solution.









1/3 HP motor solution mixer mounted on tank.

C. Filter Feed/Backwash Pumps:

1. Type: Centrifugal.

2. Casing Material: Bronze.

3. Shaft Material: Stainless steel.

4. Impeller Material: Bronze.

5. Motor Arrangement: Close coupled.

6. Motor Winding: TEFC.

7. Winding Insulation Class: `F'.

8. Mode of Control: Low water level protection.

D. Automatic Pressure Sand Filters:

1. Material of Construction: Carbon steel.

2. Finish, Internal: Grit blasted to SAS 2.5. One coat of epoxy primer and two coats of high build epoxy.

3. Finish, External: One coat of epoxy primer and one coat of paint.

4. Service Flow Rate: 22.51 cum./hr each filter (3 no. filters required)

5. Media Type : Sand, anthracite.

6. Media Depth: to be determined during filter selection by Specialist.

7. Operation: Automatic.

8. Valves: Automatic valves as indicated on drawings.

9. Face Piping: generally uPVC Class 5.

10. Underdrain: Lateral type, strong header and perforated or slotted laterals in PVC or polypropylene.

11. Accessories : Inlet/outlet pressure gauges, access manhole and air release valve.

E. De-chlorination Dosing Set:

1. Reagent: Sodium metabisulfite.










F. Anti-scalant Dosing System:

1. Anti-scalant solution.








G. Acid Dosing System:

1. Sulphuric acid, 98%.








H. Cartridge Filtration:

1. Material of Construction: 316 Stainless steel.

2. No. of cartridge filter units: 3

3. Capacity each unit: 22.51 cu.m./hr.

4. Maximum Pressure: 10 bar.

5. Particle Cut Off Size: 5 micron.

6. Cartridge Material: Polypropylene.

7. Accessories: Pressure gauges.

I. High Pressure Pump:



1. Type: Single stage, horizontal.

2. Duty: 67.53 m3/h at 14.5 bar.

3. Materials of Construction:

a. Casing: 316 SS.

b. Shaft: 316 SS.

c. Impeller: 316 SS.

4. Motor Speed: 3600 rev/min.

5. Motor: TEFC.

6. Winding insulation: Class 'F'.

7. Starter: Star Delta

J. High Pressure Flow Control Valve:

1. Working Pressure: 17 bar.

2. Materials of Construction: SS 316.


K. High Pressure Brine Control Valve:

1. Working Pressure: 16 bar.

2. Material of Construction: S.S.316.


L. Membranes with Membrane Vessels:

1. Type: Spiral wound.

2. Size: 200 mm diameter.

M. Post-chlorination Dosing System:

1. Reagent, Concentration: Sodium hypochlorite, 12%.










N. pH Correction Dosing System:

1. Reagent, Concentration: Sodium hydroxide, 49%.


3. Duty: 0 - 3.8 l/hr at 6 bar.

4. Material: PVC.

5. Control: Manually adjusted control for stroke length and automatically start-up with the R.O. unit.

6. Fitting: Foot valve with strainer, injection check valve and suction and injection tubing.



O. Flush Tank

1. Type: Cylindrical, vertically mounted

2. Material: Polypropylene

3. Capacity: 1000 liters

4. Pipework: interconnecting pipework for flushing of membranes.

P. Control Panel:

1. Type: Completely assembled, wired and tested at the factory. The panel shall be fabricated in sheet steel, shaped and reinforced to form a rigid front access enclosure. The panel shall be for indoor use in a humid 50 o

2. Mounting: All push buttons, fuses, selectors, switches, contactors, relays, indicating lights, timers, etc. to form a local central control station.

C ambient temperature to IP 54 standard.

3. Cabling: Wiring shall be brought out to screw type terminal blocks, labeled and identified in accordance with wiring diagram.

4. Nameplates: All push buttons and selector switches shall be appropriately tagged.

5. Finish: All steelwork shall be bonderised or given similar treatment before priming with epoxy paint to a smooth finish.

Q. Instrumentation:

1. pH Meter:

a. Quantity: Three (3).

b. Application: R.O. Feed Line.

c. Range: 0 - 14.

d. Type: Indicating, flush mounted meter complete with sensor and fittings.

2. Pressure Gauges:



a. Quantity: Three (3).

b. Application: Discharge of HPP, operating, and reject line.

c. Type: Dial type liquid filled.

3. Flowmeter:

a. Quantity: Two (2).

b. Application: Product water, reject line.

c. Type: Indicating, flush mounted powered meter complete with paddle, flow sensor and fittings.

R. Pressure Switch Application: Suction of high-pressure pump.

S. Flushing Valve Application: Reject bypass line.

T. Pipework: Process and interconnecting pipework for the Water Treatment Plant shall generally be uPVC Class 5 SASO 14 with flanged joints, as described under the various sections of this Specification.

U. Plant Wiring: Cables shall be suitably sized for the appropriate duty, PVC sheathed and extend only between the panel and the individual drives and controls.

PART 3: EXECUTION 3.01 INSTALLATION

A. All work shall be executed in a first-class and workmanlike manner by workmen skilled in the trade to which they are assigned.

B. Equipment and plant shall be seated and secured strictly in accordance with manufacturers instructions.

C. Adequate supervision shall be provided to maintain high quality workmanship. The work shall present a neat, mechanical appearance when completed.

3.02 NOISE AND VIBRATION

A. All piping, equipment and system components shall be installed with the utmost precautions to prevent noise and vibration transmission.

B. Equipment that would tend to cause noise or vibration shall be isolated with suitable vibration isolators to reduce noise or vibration transmission to buildings and /or other equipment. Piping connected to this equipment shall also be isolated.

3.03 TRAINING


B. Provide instructions and training to the Owners staff for the operation and maintenance of the equipment. Provide a minimum of 5 days classroom and 5 days on the job training. Each training session shall be 4 hours long.



END OF SECTION

SECTION 46 07 13

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46 07 13 - PACKAGED WATER TREATMENT EQUIPMENT.pdf