Inspection standards and precautions for castable in furnace maintenance

1. The chamber of a stove or furnace dense-phase zone around the wall and hanging at the bottom of the screen and wall castable surface should be smooth and complete uniform thickness, no wear, fall off, pits and bulge phenomenon, covering tube no nudity, no mesh cracks and perfoliate crack, appeared crack width should be less than 5 mm, greater than 5 mm must be demolished for local repair. 

2. The surface of the cyclone separator, the feed leg and the pouring material inside the feed back leg shall be complete and smooth, with uniform thickness, no wear, fall off, pockmarked surface and bulge phenomenon, and no network crack and penetrating crack. In case of layered bulge or crack, the width shall be less than 10mm, and local demolition and repair shall be carried out when the width is greater than 10mm.

3. The surface of the horizontal flue at the outlet of the furnace and the cyclone separator shall be complete and smooth, with uniform thickness, no wear, fall off, pockleness and drum phenomenon, no network crack and penetrating crack, such as the occurrence of layered drum or crack width should be less than 10mm, greater than 10mm must be partially removed and repaired.

4. For the coating of casting material that often falls off, manual vibration should be adopted to detect hidden defects. When the casting material falls off and becomes loose, local demolition and repair must be carried out.

5. Anti-wear beam casting material surface should be complete and smooth, uniform thickness, no falling off, bulge phenomenon, nail firmly, no open welding phenomenon, no mesh crack and penetrating crack, crack width should be less than 5mm, greater than 5mm must be local demolition repair. 

6. The castable at the measuring point of the boiler shall not impede the advance and back of the measuring point and change the elevation and Angle of the measuring point. 

7. The surface of castable in the water cooling air room shall be completely smooth and uniform in thickness, without any wear, fall off, pockmarks and bulking phenomenon, and no exposed overlaying layer, network cracks and penetrating cracks. In case of layered bulking or cracks, the width shall be less than 10mm, and local demolition and repair shall be carried out when the width is greater than 10mm.

8. The firebrick in the starting burner should be firm and smooth, without wear, fall off and bulge.

9. The pouring material between the cloth wind plate and the wind cap should be complete, uniform thickness, no wear, fall off and bulge phenomenon, no network crack and penetration crack, cover the cloth wind plate tube row without exposure, crack width should be less than 5mm, greater than 5mm must be partially removed and repaired.

10. Castable material at manhole door of boiler furnace and tail flue is firm and smooth, without wear, fall off and bulge.