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Increasing Turbine out Pressure and its effect

Friday, April 20, 2018   By: Oil and Gas [2256] 0 Stars
Hi all.
We have two steam turbine 1 & 2 with their discharge headers of 50 psig & 27 psig respectively. The inlet header is same i.e. 400 psig. Now what we want to do is connect the 27 psig turbine outlet header to the 50 psig header, which will operate both turbines at 50 psig. My understanding is this that when we do this the load on turbine 2 will need to be increased in order to maintain the rpm and output power. Can you guys point out any issues with this arrangement. W.r.t to its inlet nozzles, governer valves setting, sentinel valve operation etc.

Questions have been sent to the OEM of the turbine and below is the response.

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Friday, April 20, 2018   By: Oil and Gas [2256] 0 Stars

OEM response:


Power req: original 165 kW new condition: 165 kw
Design Speed: Orig: 3575 RPM new condition: 3575 RPM
Inlet pressure: 400 psig in both
Exhaust pressure: Orig: 27 psig New condition: 50 psig

The up gradation is feasible.

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Saturday, April 21, 2018   By: Ross Burns [390] 5 Stars
The backpressure steam turbine that dumps into the 27psi header can be exhausted to the 50psi header. The casing pressure rating needs validating to a higher pressure than 50psi so a new sential safety valve can be installed as you indicated.

If you do not do anything to the steam turbine nozzle then the worst is a power reduction because the mass flow through the back pressure steam turbine is restricted at the admission nozzle. Most small steam turbines will have one or two manual admission valves to achieve maximum power but these cant be left unattendent.

I would think the OEM will install a larger diameter steam admission nozzle. They should lift the cover to determine casing integrity for higher pressure and measure clearences. The OEM is my choice.

Ross

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Monday, April 23, 2018   By: Jim Watts [764] 5 Stars
Not a very enlightening response from the OEM.
Feasible is just about as low as you can go before saying impossible.
But if I were an OEM I would probably say the same as it prepares you to spend big to get what you want.

You have not indicated the turbine manufacturer or age or anything other than feasible to support my opinion so its not worth much.

However I would say from experience that turbines in the size you are using are all basically the same design built to cover a wide range of duty. Eg all good for 100psig exhaust just change the nameplate for the customer conditions if lower. The inlet nozzle would probably be optimised for the service but in your case is not much of a change. The sentinel valve would be set to suit the exhaust condition but the safety could be nearer to 100psi to be standard.
The two manual valves mentioned by Ross are to increase efficiency at low load by closing them fully one or two to reduce throttling on main governor. There is no monitoring required.
If they are closed under existing load you are in luck just open them to cater for extra flow which will be required.
I would be inclined to check the manufacturers range to see if what I suggest is likely then provided you believe the casing is good enough to take it just close the exhaust valve to increase pressure to 50 psi and see if performance satisfies you. If not you need new nozzles, or even a larger govenor valve if it is fully open.

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