Re: [MW:32122] Sulfuric acid drum nozzle problem

Nozzle failed means, what exactly happened.?  if no flow through nozzle means, it is choked. it should be dechoked and material like dirt etc to be removed, another reason may be there is some other corrosive material through reverse flow. you can conduct systematically risk / HAZOP study with guidewords. if you can isolate, drain 99% H2SO4, remove nozzle and perfoem QA / TIC (testing, inspection & certification). as per design & EPC requirements, considerations & criteria. 

chandrakant mohikar

Infra Academy.
https://tinyurl.com/InfraAcademy

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On Tue, 30 Mar 2021, 14:01 okay Tutar, <okaytutar@gmail.com> wrote:

Hello everyone, I hope you all have a nıce day.

We had a problem in sulfuric acid %99 conct. drum nozzle.

After 2 years of operation, suddenly our nozzle has been failured.

We checked api 571.Concentration of acid is ok, it is %99.Speed of acid is lower than critical level.

But, when we examine flange and piping of nozzle. There is general corrosion and thickness of weld neck is thinned . Our material is carbon steel. But, in pipe thickness is not thinned.

Do you have suggestion for reason of this problem ? What could it be ?

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