Steam Bypass System for Turbine

Check CCI at www.ccivalve.com for turbine bypass and steam conditioning. They have a vast array of steam conditioning/turbine bypass valves and I am sure they can solve your problem using one bypass valve.

Orifice plates are only effective at full flow. They do not contribute significantly to pressure drop at lower flows and are not always the best solution in modulating service like Turbine Bypass.

Good luck.

It has been done in the industry to by-pass turbines directly to the condenser, by using a series of multiple orifice plates and a control valve in series. Calculations should be performed to eliminate cavitation and be careful with the distribution of the flow inside the condenser as to avoid vibration and ensure proper mixing (as fluid might flash over). Also make sure that the by-pass line/system can be properly isolated from the main steam header (isolation valve with equalizing by-pass), as any leakage of this system during full turbine operations will cause loss of performance and efficiency.

Good luck

firstly I want to thank about your helping to me .

but I want to ask you to avoid the distribution of the flow that is by using the dumb tube at the latest stage before the nick of the condenser is not it?!

and thank you so much.

Sorry, I cannot help you here as condensers and turbine configurations vary and I am not sure of your question.

You will also need to be sure that the condenser design will be able to dissipate the additional heat and load that you suddenly expose it to as well as to avoid over-pressurisation.

firstly I want to thank you for your helping in my problem.

which I understood from your reply that orifice plates are not used in steam by pass turbine because it did not give accurately reduction to pressure at part loads that it is difficult to be controlled, however the valve trim can be controlled to give the right number of orifices as it should to be on.

This is the case when the turbine trip and you want to dump all the flow of steam to the condenser instead of venting it to atmosphere via safety valves.

Reply #1 was from a different source, however, I would suggest that you 1st dissipate most of the pressure through a serious of orifice plates and then through a control valve that can handle large pressure drops (cavitation tolerant trim). As reply #1 suggested/mentioned, at low flow the orifice plates contribute very little or nothing to the pressure drop and it will be the valve that initially sees these high pressure drop conditions.