Rules & procedures for applying double block and bleed during maintenance

[Bever]

Are there any procedures or rules available for when to use a double block and bleed? From what pressure, what temperature, what material, the time for the exposure to the dangerous products;
I am a maintenance guy and there is always issues on this subject.
Thanks for sharing any procedure.

[gtaa]

It's often a company-specific procedure. But in general, DBBs should be used when breaking containment on any hazardous material or any non-hazardous material (line size greater than 4") greater than 15 barg. Some formal guidelines are given in the HSE document which you can download here:

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[berdem]

thx thumps up

[Bever]

Thanks a lot. Problem solved!

[akbavra]

Diesel engine runway safety-

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[Marty Thompson]

Diesel engine runway safety-

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[Marty Thompson]

Diesel engine runway safety-

[link Point to another website Only the registered members can access]

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[f81aa]

Many posts by akbavra, same result.

It doesn´t look like a fair way to generate traffic towards that site.

Regards

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