Blinding & Deblinding procedure | Line breaking | Spading & Despading | Spectacle blind | Refinery | oil & gas | Mechanical Engineering | EPC( Engineering, procurement & construction )

Blinding & Deblinding procedure | Line breaking | Spading & Despading 

Blinding and Deblinding procedure

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Blinding and De-blinding procedure

Blinding means stopping a process flow by placing a properly rated obstruction in a line.

       It is the preferred method of positive isolation by stopping the process flow line.

Before starts Blinding check the Following...

1. Check the permit is correct for blinding.

2. Get the checklist in which mentioned that the particular line which has to be blind that is properly isolated, drained & depressurized. If not then go for it.

3. Check CTRA that is Critical Task Risk Assessment.

4. The most important thing is the blind list.

Note- Always do blinding according to the list provided by plant Operator or Process Engineer.

Do some Arrangements

1. Always barricade the particular area where you are going to do maintenance activities or Spading & Despading Procedure.

2. Always keep water hose & Fire extinguisher for emergency if some hazard happened during Spading & Despading Procedure.

3. Keep tip tray for collection of fluid which comes during Spading & Despading Procedure.

4. Check your tools properly. Always use brass hammer🔨.

5. Use breathing apparatus if required.

Note- Breathing apparatus is used for safety of dangerous gases like H2S. If H2S gas is more than 15 ppm then you should you Breathing apparatus.

Blinding and de-blinding arrangements

Let's Start

1. For blinding & Deblinding procedure always loose bottom side bots of flange. So that if any fluid present in that line that will drained or depressurised properly.

Always loose bottom side bolt first.

2. Clean the gasket area properly. So that gasket will fix in proper way.

Gasket area of flange

3. Insert Blind according to instructions like Tale blind, Spectacle blind, End blind or Temporary blind.

4. Insert gasket. Use proper ratings of gasket.

watch a video

5. Tight all the Bolts. 

Note- Always tight opposite bolts of flange.

•  For Deblinding procedure follow the same instructions.

6. Keep proper Housekeeping.

Housekeeping after blinding and de-blinding

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