4 replies to this topic

[Root]

Hi,

I'm commissioning WHRU, where Gas Turbine EGT will be routed to WHRU and Therminol 66 will be heated up to 300⁰C. In cause and effect it is given that if flow difference more than 10% then close damper toward WHRU and open to atmosphere and simultaneously also shut down hot oil main  pump circulation.

In my opinion shut down logic is not correct it should keep it running until temperature bring down to safe limit.

Can any one explain what should be the correct logic.

Thanks

Root

 

[Zauberberg]

Toor,

 

Which "flow difference" are you referring to?

[Root]

Hot oil Flow.

[Girish Gastgar]

Minimum hot oil flow shall be maintained to eliminate hot oil tube skin temperature exceeding the max. allowable limit.

Further I guess hot oil to WHRU is from Hot Oil Pumps; which are protected for minimum flow.

I hope this helps you.

[Saml]

You don't mention the initiating event you are protecting against. A difference of 10% is a symptom of something

 

If you are protecting against an oil leak into the box, then the actions you mention are the right ones.

 

If you have parallel passes and want to ensure that a skin temperature is not exceeded, a more controlled shutdown may be a sensible option to avoid the temperature overshoot due to thermal inertia