How would you prepare a hydrocarbon vessel for vessel entry?

Question

Accepted Answer

To prepare a hydrocarbon vessel for vessel entry, follow these steps:

Ensure the vessel is properly isolated from the process and all sources of energy
Ventilate the vessel to remove any flammable or toxic gases
Perform a thorough inspection of the vessel for any signs of leaks or damage
Implement proper lockout/tagout procedures to prevent accidental activation of equipment
Provide appropriate personal protective equipment (PPE) for the workers entering the vessel
Establish a communication system and rescue plan in case of emergencies
Follow all relevant safety regulations and guidelines

Accepted Answer

Safe entry in any confined space like pit, sump, vessel, vat, tank, chamber, furnace, oven, pipe, line, gutter or isolated and unknown place needs a work permit system. The hazards of work are toxic or flammable gas inside, asphyxiating atmosphere, the accidental inflow of chemical or starting of agitator, etc.

Accepted Answer

The vessel should be depressurized and purged with nitrogen. 
Thereafter lab sampling is to be done for the presence of hydrocarbon. 
If no hydrocarbon is reported proceed for isolation of all the inlet and outlet lines. 
All inlet and outlet lines should be blinded.
Manhole of the vessel can then be opened.
Purging of the vessel is to be done with plant air to make is safe for vessel entry.
Thereafter lab sampling is to be done for oxygen in the vessel. Oxygen concentration should be more than 19.5%. If it is less than 19.5%, continue air purging. Then give sample again and achieve 19.5% oxygen.
Once oxygen is sufficient, arrange for lighting inside the vessel.
Issue vessel entry permit.
Vessel entry can be done now.

How would you prepare a hydrocarbon vessel for vessel entry?

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