Q u e s t i o n s ? C o n t a c t D e v c o n T e c h n i c a l S e r v i c e s : 8 0 0 - 9 3 3 - 8 2 6 6 w w w . d e v c o n . c o m P u m p R e p a i r P u m p r e p a i r s a r e v e r y p r a c t i c a l a s r e p l a c e m e n t c a n c o s t t h o u s a n d s o f d o l l a r s . H e r e i s h o w t o r e p a i r p u m p v o l u t e a r e a s a n d i m p e l l e r s Follow the guidelines previously described for SURFACE PREPARATION. 1. Since worn areas are usually "pitted", and the substrate is usually porous, surface preparation is vital. A good 3-5 mil sandblasting profile is needed for best adhesion (Figure 1) . 2. Thoroughly degrease the area to remove any residual abrasive medium lodged in pore of material (Figure 2) . 3. Fill all gouges, greater than 1/8" in worn areas, with mixed Titanium Putty # 10760 or Ceramic Repair Putty #11700 compound. Use spatula or putty knife to smooth the surface. A simple technique is to wet your hand and gently rub the palm over the epoxy in a circular motion (Figure 3) . 4. Next, topcoat the entire volute area with Devcon's Brushable Ceramic #11760 or #11765 . Multiple coats are for a "Pin hole" free finish. This creates a 15-25 mil chemical resistant coating to protect the interior of the casing (Figure 4) . 5. For worn impeller blades, follow the same surface preparation as for pump casing. Check for and clean off any chloride contamination, as salts react as a release agent and can prevent epoxy from bonding to surface (Figure 5) . 6. Next, rebuild the missing metal from the blades by welding a 3/8", rod for a "leading edge", and then tack weld expandable metal from the leading edge to the existing metal surface for reinforcement (Figure 6) . 7. Now, fill the missing metal areas with Ceramic Repair putty #11700, applying small amounts at a time, to "wet in" the epoxy and prevent air pockets, being sure to push epoxy through until it oozes out the other side. Smooth over final coating as described in step 3 to improve the pumps flow. Plastic forms can be used to support the epoxy while curing (Figure7) . 8. Finally, apply Brushable Ceramic Red # 11760 for the first finish coat for a 15-20 ml thickness to smooth out rough pits in the casting. Within 3-16 hours, apply a coat of Brushable Ceramic Blue # 11765 to cover any unfilled areas from the first coat (Figure 8). NOTE: Stainless steel impellers require different preparation or coating. Please, consult the factory or a local Devcon Technical Representative for further details. Always remember, in coating pump impellers and casings, to be aware of your clearances inside the volute area. This is critical, as the dimension inside this area restricts the amount of coating you can apply. If clearances are acceptable, Devcon also makes a group of large ceramic beaded products to coat and protect pump volutes from severe abrasion from pumping high solid and abrasive materials. Figure 6 Figure 8 Figure 7 Figure 1 Figure 4 Figure 2 Figure 3 Figure 5 9.