BOILER COMMISSIONING - MISC TANKS SMALL ,LARGE OF THERMAL POWER PLANT

There are different sizes of tanks are available in boiler ( Fuel oil storage tank , LDO tank , day tank

CBD tank , IBD tank , CC pump emergency tank , Drain oil tank , FST (feed storage tank & Deaerator) 

etc.  These tank can be divided according to their size and there process requirement . However Feed 

Storage tank comes under pre-boiler system and need separate chapter for its erection and 

commissioning . This I will discuss when I will be discussing turbine erection and commissioning.

STORAGE TANK ( SMALL AND MEDIUM) –GENERAL CHECK LIST

Access to the plant item is adequate

Illumination in the plant area is adequate.

Any other requisite safety provision is adequate for the immediate commissioning activity.

Plant item is in a clean condition.

All necessary locks and keys for padlocks interlocks etc. are available.

Hot surfaces lagged for screened sufficiently to provide protection for personnel.

Check the installation as per drawing specially orientation of nozzles.

Check that all internal items, grills, trays filter elements etc. are installed.

Check that float valves if fitted are correctly installed and operating freely.

Check that tank is internally clean, free from debris, and that the internal and external protective coating.

Check that all external fittings, gauges and indicators are as per drawing and securely fitted and supported. Unused bosses to be plugged or blanked off.

Check that all pipe work systems connected to the tank are complete at least to isolating valves.

Check that filling, overflow, vent and drains are complete, at least to isolating valve.

Hydraulically test tank as appropriate and check for leaks. Record if tank settlements are made.

Check that heating arrangements (steam heating or electrical heating) is fitted, is to specification and complete.

Check that lagging and cladding (if required) is complete to specification.

Check that support structure, ladders and handrails are satisfactory.

Check access doors (if fitted). Sealing arrangement of access door to be checked.

All the checks to be made and protocol for future use.

STORAGE TANKS LARGE –GENERAL CHECK LIST – A FEW MORE ADDITION TO ABOVE

Check all valves, switches, pressure switch etc. as per drawing and check list.

Check  tank is internally clean and finished as per drawing.

Check the  fire protection arrangements available or not available.

Check all the access manhole covers fitted . Specially check roof manhole cover and locking arrangements.

Confirm that the vent area is at least 1.5 times the filling pipe or suction pipe area (whichever is the greater) and fitted with a 4 mm mesh non ferrous wire cage.

Oil tanks, check the  combined water draw off and clean-out sump drainage arrangement

Check  the tank drain valves locking arrangements.

Check all the lines (overflow ,drain etc) connected to designated sump .

Check the gradient also for these lines.

Check  the local and remote, high and low level alarms together with the testing facility

For oil tanks, Check the heater trip and other protection logic as per approved scheme.

Check the operation of pneumatic valve as per check list given in earlier dispatch.

Check the tank earthling arrangements comply with the requirements specified for the particularly size of the tank. (Tanks up to 30m dia, 2 opposite spared earth strips; tanks over 30m dia, 3 equally spaced earthling strips).

Check the tank calibration certificate ( if available)

Check the level gauge and the level on tank body on big letters so that same can be seen from distance.

Check the bund arrangement of the tank . It should have been completed and free from debris.

Fill tank, proving manual and automatic system of control (if applicable)

1.            Record rate of filling; Height/minute

2.            Record rate of filling: Quantity/minute

3.            Record operation level of low level alarms.

4.            Record cut in level of auto filling

5.            Record cut out level of auto filling

6.            Record operation level of high level alarms.

With all points of consumption at maximum flow and inlet valve shut, measure:

1.   Rate of emptying: Height/minute

2.   Rate of emptying: Quantity/minute

Protocol all the reading for future use. During commissioning all big tanks reading to be taken as such tank does not get empty very often. If you miss to note them you may not get chance to do that in near future. Therefore all the activities to be completed once for all.

continued to part-vi

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