Leak rectification work of guard pond partition wall at WWT area and underground cooling water line pit wall at HYAM plant in FACT Petro-UC

Leak rectification work of guard pond partition wall at WWT area and underground cooling water line pit wall at HYAM plant in FACT Petro-UC

Preparation of crack & Packer fixing: Remove heavy deposits of grease and dirt by scrubbing with detergent solution and washing with plenty of clean water to ensure complete removal of the detergent. Dirt alone may be removed with wire brushes or similar mechanical means. Remove deteriorated concrete, laitence and paint. The best treatment is grit blasting with sand, steel shot or a proprietary abrasive. Where grit blasting is impracticable,use rotary wire brushes. Blow the cracks and treated surfaces with oil free compressed air to ensure complete removal of all dust and loose particles. Ensure that wet surfaces are blown dry.

PU Injection: Part a) Providing and applying Nitofill WS60 of Fosroc or equivalent products of make SIKA/BASF/HENKEL which produces a rapid setting foam in the presence of running water. Product used shall have CE marking and compliance according to Construction Products Directive 89/106/EEC (CPD)

PU Injection: Part b) When the flow of water is stopped the cracks are reinjected with Nitofill UR63 or equivalent product of make SIKA/BASF/HENKEL. The surface of the crack must be sealed and injection nipples bonded in place before Nitofill UR63 or equivalent product of make SIKA/BASF/HENKEL is injected using Nitomortar PE. The PU grout should have a pot life of 20 minutes at 35°C and a velocity of 3 poise. Product used shall have CE marking and compliance according to Construction Products Directive 89/106/EEC (CPD)

P Rasheed

T K SALIM

SAJEEV AK