Kerala Water Authority-KWA has published State Plan-2021-22-Uwss To Punalur Municipality - Replacement Of Filter Media, Valves And Maintenance Of Electro Mechanical Items And Allied Works At 9 Mld Wtp, Punalur-General Civil Work. Submission Date for this Tender is 02-02-2024. Filter Media Tenders in Kollam Kerala. Bidders can get complete Tender details and download the document.
| Sr No | CorrigendumDate | Corrignedum | CorrigendumType | NewSubmissionDate |
| 1 | 29-Jan-2024 | Retender extension | Date | 02-02-2024 |
| Sl. No. | Item Description |
| 1 | working charges |
| 2 | OD169175/2023-2024:Designing dual media through central/state Govt. Institution-Designing of dual media filter including under drainage system and air scouring system so that uniform back washing and uniform air scouring is obtained through uniform distribution of back wash water and compressed air, without any loss of the dual layer filter media and to attain the maximum efficient back wash and air scouring. (The dual media filter bed has to be designed considering the various parameters like raw water characteristics, desired rate of filtration, required filtrate quality etc. The design shall include calculation of depth of different media, considering the parameters like effective size and uniformity coefficient of the media, settling velocities of the media etc. The underdrain system and air scouring system shall be designed to avoid shooting up of lighter anthracite when air scouring is done. The design shall avoid interface chocking caused by mixing up of different layers at the interface in dual media filter beds.) |
| 3 | OD169174/2023-2024:Supply of Anthracite for the required quantity as per design, properly graded and tested by the supplier specifying the source of material and quality commensurate to the following specifications.Sp.Gravity:1.45- 1.55,uniformity coefficient-1.5,bulk density-0.73-0.75 T/m3,Hardness-3MOH,Hard grove:44- 55,carbon content:>90% above,Ash-3-4%,Volatile-5-7%,solubility-1.5% in 10%HCI/10% NaOH for 24 Hrs certification including all cost ,taxes,conveyance to site,loading&unloading etc. complete.(The contractor must submit the test certificate of Anthracite from State Govt /India Govt lab/ Institution to ensure the above-mentioned-Technical Circular No.KWA/JB/TMU/4659/2021 Dated 17.03.2021 latest. |
| 4 | 100.55.5:Removing filter media from the filter beds without making any damages to the existing structures and back manifolds and stacking at a safe and convenient place for segregation process and as per the directions of the department officers etc. complete. |
| 5 | OD72780/2023-2024:Repair / Alteraion of the under drain system by replacing all damaged pipes with suitable arrangements and providing all additional mechanisms and fixtures required according to the design of multi layer filtering system complete |
| 6 | OD72781/2023-2024:Washing and cleaning the filter chamber and rectifying damages of filter walls including glazed tiles and floor of the filter bed by concreting where ever necessary, repairing the entire chamber suitable for dual media filter refurbishment |
| 7 | 100.98.47:Supply of Filter Media Sand. |
| 8 | OD72782/2023-2024:Supplying Grit of effective size varying 6.35 mm to 3.2 mm for supporting media of filter bed |
| 9 | 4.1.2:Providing and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - All work up to plinth level:1:1/2:3 (cement : 11/2 coarse sand : 3 graded stone aggregate 20 mm nominal size) |
| 10 | 100.55.6:Cleaning, drying and seiving the removed filter media and stacking the dismantled pebbles for reuse and spreading in the filter box in layers as per specifications and as per directions of the department officers. |
| 11 | OD72783/2023-2024:Refurbishing the filter bed using dual layer filter media as per the design separately laying each grade of supporting gravel manually so that each pebble is placed in close contact with each other leaving maximum void space between and the smaller gravels above. The filter sand media and the Antracite are placed above separately. |
| 12 | OD72784/2023-2024:Conducting trial run of all the filter beds for a period up to 30 days, recording performance of filter in terms of quality, quantity of filtered water and length of filter run and providing required training to the operators of KWA for the trouble free functioning and maintenance of the filter beds |
| 13 | 100.98.1009:Engaging Fitter ( grade 1). |
| 14 | 100.98.1008:Engaging Coolie. |
| 15 | OD72785/2023-2024:Fabrication, supply and erection of chute structure for filter bed to avoid turbulence in the filter bed. |
| 16 | 100.98.462:Supply of CI Double Flanged Sluice Valve Conforming to IS 14846 - 2000, Sluice Valve with Cap PN 1.6, Size 250mm. |
| 17 | 100.31.1.6:Conveying and fixing C.I. sluice valves (with cap) by providing bolts, nuts, rubber insertions etc., complete, but excluding the cost of the valve (tail pieces, if required, will be paid separately): 250mm diameter, Class I. |
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