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I m working in DHDS unit. where Reactor outlet material ( H2s, H2, Treated Diesel, N2 compounds etc) flows to series of Exchangers( 10 no.) tube side . Currently we found minor leak at drain line (CBD) of last exchanger outlet (press.44 kg Temp 125 °c) . Try to attend with online clamp with material filing( Benzola material used) but no effect. Any other material or method to fill up the leak?
 
Answers
14/01/2017 A: RAMAKRISHNA DADI, HMEL, dadi2rama@gmail.com
1) first you are applying the online sealing compound of material each type is different properties like what is the temperature can withstand like flash fire check before applying.
2) you need to check the surrounding the pipe material thickness is thinning observed means more h2s with effluent more chances of thinning.
14/01/2016 A: keith bowers, B and B Consulting, kebowers47@gmail.com
Safe temporary plugging of a leak in a hydrocarbon containing pipe is highly dependent on the root cause of the leak. As an example: If the leak is due to generalized thinning of the pipe, it is likely numerous other spots are near leaking, and catastrophic opening of the pipe and total loss of containment may be highly probable and an unaccepable risk. If, on the other hand the leak is from an isolated external corrosion pit, then clamping and thus sealing is likely to work with little risk of aggravating the leak and 'hiding' an unsafe condition. If the leak is from a crack in a welded joint and NDT can safely determine the adjacent HAZ is sound and not compromised, then clamping MAY be suitable. IF, however NDT cannot be conducted to show adjacent joint and parent metal is sound, one must consider the risk and consequences of complete 'brittle fracture' of the joint if any stress is added to the leak. THERE IS NO "pat answer" and careful analysis and thought given to potential for exacerbating the leak while attempting a temporary 'patch.'