Hydraulic ram pumps and Sling Pumps

figure 5.49Repair of large holes where all material has been removed from inside and outside must beperformed using the same technique as originally used. That means, if the structure has been builton a mould, it is necessary to shutter the hole from the inside and to apply two coats of plaster fromthe outside. Cure each coat or cover the area with plastic. If the tank was built without a mould, theplastering to the damage should be done from inside using a shutter outside. Apply the nil coat afterone day. Curing the patch for a long period is unnecessary if the reservoir can be filled above therepaired part again after two or three days. After all, this is the best way. Again if small leaks appearthey usually close over, Fig. 5.50.figure 5.5063