Kerala Water Authority-KWA has published State Plan 2021 22 Removing Filter Media And Repacking With Anthracite Duel Media In Bed No 8 At Plant No3 Head Works Aluva State Plan 2021 22 Removing Filter Media And Repacking With Anthracite Duel Media In Bed No 8 At Plant No3 Head Works Aluva. Submission Date for this Tender is 27-10-2021. Filter Media Tenders in PH Division ,Aluva Kerala. Bidders can get complete Tender details and download the document.
Sr No | CorrigendumDate | Corrignedum | CorrigendumType | NewSubmissionDate |
1 | 23-Oct-2021 | Class of Contractor | Other | 27-10-2021 |
2 | 23-Oct-2021 | Date extension1 | Date | 27-10-2021 |
Sl. No. | Item Description |
1 | PART I : Working Charges |
2 | Supply of Anthracitein quantity required 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% HCl/10% NaOH for 24 Hrs, certification including all cost, taxes, conveyance to site, loading and unloading etc. complete |
3 | 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. |
4 | 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 |
5 | Modification / alteration of the existing back washing system comprising of compressed air and clear water providing new air/blower and clear water providing new air scouring system, providing new pressure regulating valves or such other machanisms and fixtures required according to the design of multi layer filter media pack back washing operations complete |
6 | 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 | Supply of Filter Media Sand |
8 | Supplying Grit of effective size varying 6.35 mm to 3.2 mm for supporting media of filter bed |
9 | 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 | 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 | 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 | 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 | Fabrication, supply and erection of chute structure for filter bed to avoid turbulence in the filter bed. |
14 | Providing and fixing I st quality ceramic glazed wall tiles conforming to IS : 15622 (thickness to be specified by the manufacturer), of approved make, in all colours, shades except burgundy, bottle green, black of any size as approved by Engineer -in-Charge, in skirting, risers of steps and dados, over 12 mm thick bed of cement mortar 1:3 (1 cement : 3 coarse sand) and jointing with grey cement slurry @ 3.3 kg per sqm, including pointing in white cement mixed with pigment of matching shade complete. |
15 | Unforseen items if any |
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