IF THE BOILER TUBE LEAKAGE IS MINOR AND IF IT IS POSSIBLE TO HOLD DRUM LEVEL AND DEARATOR LEVEL THE BOILER CAN BE TAKEN OUT OF SERVICE IN THE NORMAL MANNER.SYMPTONS OF BOILER TUBE LEAKAGE ARE ABNORMAL NOISE, HISSING, INCREASE IN FEED FLOW, VISIBLE LEAKAGE OUTSIDE THE UNIT, STACK EMMISSION, UNSTABLE FLAME, DROP IN THE FLUE GAS TEMPERATURE AND DROP IN DRUM LEVEL.IN ABOVE CASES REDUCE THE LOAD ON THE SET AND PREPARE TO WITHDRAW THE UNIT AS QUICKLY AS POSSIBLE.
IN CASE OF MAJOUR TUBE BURST,IT CAN CAUSE FURTHER DAMAGE TO OTHER PRESSURE PARTS IN THE VICINITY.IT CAN CAUSE FLAME FAILURE IF THE TUBE LEAKAGE HAPPENS TO BE THE FURNACE ZONE.IN THIS CONDITION IT WILL BE DIFFICULT TO MAINTAIN LEVEL IN THE DRUM.THIS TYPE OF TUBE BURST WILL BE APPARENT BY THE LOUD NOICE OF THE STEAM.IN SUCH CASES TRIP THE BOILER IMMEDIATELY,SHUT OFF FEED WATER TO THE BOILER,SHUT OFF F D FANS.LET THE I D FANS RUN AT THE MINIMUM LOAD TO EVACUATE ESCAPING STEAM TO STACK.TWO OR THREE HOURS AFTER THE PRESSURE IS OFF ,OPEN THE MANIFOLDS AND LET THE BOILER COOL DOWN WITH MINIMUM AIR FLOW.
No comments:
Post a Comment