Deaerator Flooding

Reason:

<...Flooding was occured at high load during commissioning period....>

Countermeasure:

Run the deaerator at less load.

It sounds like simple water management to me. Without further detail as to exactly what happened, I'm inclined to say the likely cause is operator error.

I'm not the OP, and I don't know anything about deaerators, so I feel well qualified to address this question. ;-)

I assume that a deaerator is not supposed to flood during normal operation within its operating limits.

This happened during commissioning. Presumably (I know) whatever the operator did was in accordance with the commissioning plan.

I'm assuming (I know) therefore, that it occurred while testing within its operating limits (within which, it should presumably not have flooded).

Why else would they be asking the question?

For anyone who has done a plant commissioning, they will tell you there are all kinds of bugs to work out, valves that are nowhere near tuned correctly (I've found some installed backwards ), control philosophy that works on paper, but not in practice, and standard OPs are great for generic know-how, but the actual operation is an art (and nearly every plant will be different).

There is a process of learning how quick the plant reacts to changing this or tweaking that. Water management is a typical stress even for the operators of long-time running plants and as I said there is an art to it. Knowing exactly when the water level in a certain drum is going to start declining and call for more is part of that learning curve and then knowing how much and when to tweak a certain valve to account for it is another thing.

What is the control scheme for the DA? Is the make-up water sent first to the DA or the condenser? Was the plant "steady-state" for 12 hours or was it in some transition? How is the plant designed to handle too much water?

All these things make a difference, but from my experience, when someone says "start-up" and follows by water management issues, it tells me the plant is in a transient state and the operators took the wrong actions. Possibly because they started out with too much water and didn't understand how to deal with too much as it started to move around the plant (ie operator error). Possibly because some valve was out of position (ie operator error). It is just impossible to say exactly without excruciating detail (unfortunately).

Thanks for the explanation! (Maybe the things I commissioned were (usually) more black and white--things like electromechanical movements. ;-)

Make up water to deaerator has to be the cause as one poster said water management.

You should only get back less then you send out, I would start at the make up water level controls.

I'll take a WAG on this...

Were all the drums (and condenser) in the normal operating band at initial start-up?

If so, there's your probable cause.