Method statement for water tank GRP lining.
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Method statement for water tank GRP lining.

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Method statement for water tank GRP lining

The purpose of this method statement is to describe the procedure for the application of the  performed GRP lamination in the RCC Water tanks.  These documents describe the GRP lamination applied in the Potable water Tanks, Sump pits and Manholes.

 Equipment: 

  •  Roller 
  •  Scaffolding 
  •  Ladders 
  •  Polythene sheets 
  •  PPE  

Materials: 

  •  White Gelcoat     - 2900 W 
  •  GP Resin            – TP1110 
  •  Catalyst               - Luperox 
  •  CTG MAT           – 300/450 CSM  

Executing.

1-Clear the surface to remove all honeycombs and smut materials.

2- Any small hole’s undulations on the concrete surface and horizontal and vertical corners shall be properly chamfered and rectified by the main contractor as per revised concrete method statement.  

The below steps is to be followed on continuity basis as the chemical reaction will be carried out during the application process in wet condition forming Glass Reinforced Plastic. As there will be no delay intervals between each layer.

 3- Apply primer as GP resin on the surface of the wall using roller. 

4- E glass surface mat(300gm/m²) or glass reinforced fabric layers are used consisting of approximately 60%-70% GP Resin by weight.

5- Above step No. 4 is repeated with E glass surface mat(450gm/m²) approximately 60%-70% GP Resin by weight to ensure a thickness of 4mm. 

6- Thickness of reinforced layers is generally 0.08-1.00mm which provides a protective barrier against corrosion and all glass fiber used as fiber glass reinforcements shall be type E glass that shall comply with BS 4396 glass fiber chopped strand mat for the reinforcement of polyester resin system as per manufacturer’s data sheet attached.  

7- Finally White Gelcoat is applied using 2900 W with wax  for proper filling of pinholes and to make the complete tank surface smooth. 

8- Guarantee will be provided for any manufacturing defects in workmanship and material.  

Method of Laying Procedure.

1- The required amount of catalyst or hardener and other ingredients such as accelerator or permitted filler shall be accurately measured and thoroughly mixed to 60%-70% resin and 30% fiber. 

2- Smooth rolling pressure shall be implemented during laying time as excessive rolling pressure may be avoided because mat distribution may be disturbed, or it may break the fiber strands. 

3- It shall be ensured that good adhesion is obtained between successive layers of the laminate to avoid any peel off between the layers due to improper use of rolling.

3- In all types of laminates adjacent pieces of laminate including feather edged reinforcement shall be overlapped by not less than 100mm. So far as is practicable, all joints shall be staggered through the thickness of laminate and in no case shall joints coincide in adjacent layers. 

4- When directionally biased reinforcement is used care shall be taken to ensure that the high strength fibers are adequately lined in the correct direction to give the required strength. Any spillage drips or runs shall be suitably removed. 

5- All items shall be cured in accordance with the resin supplier’s instruction, whenever possible this shall be done at the manufacturer’s works. 24–36-hour clear curing time shall be allocated to achieve proper bonding and setting of laminated layers on the surface of concrete walls. 

6- Should the curing time has not elapsed, and water filled prior to the above said time duration the above-mentioned warranty will be void.

7- Repairing work should be conducted by the same lamination.  First the Laminating area is kept dry then make rough the surface with grinder. The joints of the adjacent sides are also cleared and laminated overlapping on both sides not less than 100mm, if required.    

8- The above lamination is kept for 48 hours for  proper drying.    



 


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