REPAIR REPLACEMENT OF GI DI WATER PIPE LINES AND ALLIED CONNECTED WORKS AT DCA ALISDA CEPTAM AND MTRDC UNDER GE I R AND D WEST BENGALURU

M & L for Seven-Stage Cleaning and Sterilization of Inside under ground sump of capacity 01 lakh litres by Mechanical and Scientific Methods, involving Bacteriological Treatment with approved Chemicals and Ultra Violet Ray Treatment, complete all as Specified and as Directed. Work shall be carried through one of the specialized agency mentioned below only : RAYS CLEANTECH / INUS WATERTECH / SATYA ENTERPRISES. The detailed specification is given in Particular specification of the tender which shall be followed.

all as per Item No.01 above but for UG Sump capacity of 1.25 lakhs litres

all as per Item No.01 above but for UG Sump capacity of 25,000 litres

all as per Item No.01 above but for UG Sump capacity of 18,000 litres

all as per Item No.01 above but for UG Sump capacity of 11,000 litres

all as per Item No.01 above but for Over Head Tank of capacity 75000 litres

all as per Item No.01 above but for Over Head Tank of capacity of 50000 litres

all as per Item No.01 above but for Over Head Tank of capacity 14000 litres

M&L for Applying Three coats of Sika Topseal 107 or Aqua Arm Top Guard inside of the wall & floor of the Sump/ tank, a two component, ready to use polymer modified cementatious coating . First Coat should be applied horizontzlly and set glass fibre net over the water contact surface and apply consecutive second and third coat vertically and horizontally. The thickness of coating shall not be less than I .5mm. Note: i) Work to be got executed only by the authorized applicator of manufacturer all as specified and directed ,including thorough surface preparation by mechanical grinding, wire brushing, scraping, chipping and removal of all loose particles, laitance, old paint/coating, algae, scales, grease, dust and other contaminants to obtain a clean, sound and dry substrate. ii) Minor cracks, honeycombs, pinholes, blow holes, construction joints and damaged concrete surfaces shall be repaired and made good using approved epoxy mortar/epoxy putty/non-shrink repair compound as required to achieve a smooth and uniform surface. iii) The coating system shall be solvent-free, non-toxic, potable water approved food-grade epoxy coating suitable for continuous immersion in drinking water, conforming to NSF/ANSI-61 or equivalent international standard and relevant IS/CPHEEO requirements. The coating shall be applied strictly in accordance with the manufacturer's specifications, allowing the recommended re-coating interval between successive coats. iv) The finished coating shall provide excellent adhesion to concrete, high abrasion resistance, resistance to algae, fungi, bacteria, chlorinated water, chemicals and corrosion, and shall form a smooth, seamless, impermeable, hygienic and easy-to-clean surface suitable for potable water storage. The completed coating shall be free from pinholes, blistering, peeling, cracking, sagging, delamination and all other defects. Holiday/pinhole testing, thickness measurement and necessary touch-up works shall be carried out wherever required to ensure a defect-free coating before commissioning.