Problem Identification & Corrective Action Sl No. Problem Potential Cause Solution 1 Chain rises off from sprocket 1.Excess chain slack. 2.Excess wear at the bases of sprocket teeth. 3.Excess chain extension. 4.Foreign material stuck to the bases of sprocket teeth. 5.Reverse rotation of conveyor 6.Uneven chain tightening of chain 1.Adjust the amount of slack equally at both sides. 2.Carryout hard facing of the sprockets 3.Replace the elongated chain parts. 4.Remove the foreign material from the bases of the teeth. 5.Avoid reverse rotation of the conveyor when chain tightened is uneven 2 Chain separates poorly from the sprocket. 1.Sprocket misalignment. 2.Excess chain slack. 3.Excess wear at the bases of sprocket teeth. 4.Uneven chain tightening of chain 1-Adjust alignment. 2-Adjust the amount of slack.
Now days, we are hearing more on explosion in Boilers & related auxiliaries. This is harming man, machines & system and creating unrecoverable situations in power plant. Upon thinking on this following major causes or reasons come into picture. The main reasons for Boiler explosions are; Operating the Boiler more than the design pressure for long time Operating the Boilers at lower water level in drum High furnace pressure Poor water quality Poor maintenance of Boilers in shutdowns Ignoring the aging factors of Boiler parts Operating the Boilers at higher main steam or metal temperature Power plant safety Questions & Answers Viva Questions & answers for preparation of BOE exam & interview 1-What are the reasons for operating the Boilers at more than operating pressure? Malfunction of pressure transmitter or leakages in its impulse line Faulty local pressure gauges Faulty safety valves or safety valves set at higher pressure Improper control of
