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Hello, I occasionally review pipeline integrity management systems for various natural gas or hazardous liquid lines in HCAs (High Consequence Areas). I'm aware of the limitations that standard MFL inspection tools have with regard to crack detection and for a pipeline operator to be confident...

Thanks everyone, Some good advice here and the benefits of the redunduncy from independent chargers, batteries and coils is clear. Of course, one has to consider the best value solutions taking into account the probability of various failure modes, as well as the consequences (which are...

Thanks for the responses, folks. I can see the benefits of separate trip coils with dedicated supplies but have picked up that this doesn't seem to be standard practice amongst the major manufacturers. To answer ScottyUK's question, the breaker is on the HV side of the GSU. The hardwired trip...

Thanks Pikoplatt, The problem here was not the alarms as these were all being generated as normal. The issue here was the breakers unable to open on the trip signal because 110VDC has been lost. The circumstances resulting in the failure of the site wide DC system are still being investigated...

Hello, I'm looking into a steam turbine failure (150 MVA)which occured when the station site wide 110V D.C. supply was lost. The turbine ended up being driven backwards (motoring) as the shunt trip circuit breakers protecting the turbine / generator downstream were energise-to-open and there...

Bob Fair comment re the speed - I agree speed control wouldn't work. However using current set-point control the controller would operate the pumps at the same current therefore the pumps could indeed run at slightly different speeds to ensure the pumps are operating at the correct point on the...

I'm looking to run 2 large (600kW) centrifugal pumps in parallel (duty / assist). One of the pumps is new the other is 50 years old but has similar head / flow characteristic although lower efficiency now. I'm concerned that the pump curves are not continuous rising to closed valve. Are there...