Leak plugging

In the FMECA procedure [2,3,256], an exhaustive list of the equipment is first made. Every item on the list is then reviewed for possible ways in which it can fail (the failure modes are open, closed, leaks, plugged, on, off, etc.). The effects of each failure mode are then recorded and a criticality ranking of every item of equipment is calculated. A limitation of this procedure is that combinations of failures which may cause an incident are not really identified. Failure modes and effects analysis (FMEA) is the same procedure without the criticality analysis. 

When the sample period is over, the sample container should be disconnected from the sampler and carefully checked for leaks. Plugs or caps should be installed on the valves. The sample information tag should be filled out fully. The cylinder should then be put into a proper case for transport. D.O.T. rules apply, even in your company trucks and autos. A cylinder should never be transported haphazardly. 

Valve failure Cooling air/water flow leaks/plugs in lines Catalyst failure... 

Measure amount ol lost capacity Coked catalyst High-pressure boiler leaks Condenser tube leaks Plugged seal legs Improperly installed catalyst support screens... 

Leaking plugs due to cross-threading is a common start-up problem. Hence, many air coolers are simply never cleaned. 

Do not take outage or reduce pressure on piston cylinder. Check Valves C and D for leaks, plug valves to protect threads, prepare sample information tag, and box for transport. 

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