5 replies to this topic

[Phenol]

For commissioning new storage (mounded bullets) which is the appropriate method for first time inventorying:

 

Filling water and displacing water with propylene vapours

 

Or

 

Nitrogen purging of bullets (for oxygen removal)

 

Please note bullets are large size 4500 m3 water capacity

 

Propylene source is from road tankers.

 

Bullets storages have flare header connection for purging gas

 

Rajan

[Bobby Strain]

4500 m³ represents multiple vessels. Maybe you gave us the wrong volume. If not, how many vessels are involved, and how are they connected? You certainly want the vessels to be dry, so you can't use water.

 

Bobby

[Phenol]

These are large bullets (mounded) each of 8.5 meter dia and &75.0 meter tangent to tangent length.

 

Regards

[Phenol]

2 such bullets are installed in parallel - one for receiving propylene brought by road tankers and other for supplying propylene to process plant supply propylene bullets.

 

The third is again mounded bullet of smaller size for collecting propane returned from process plant for final disposal through road tankers - return propane bullet.

 

Regards

[farid.k]

2 such bullets are installed in parallel - one for receiving propylene brought by road tankers and other for supplying propylene to process plant supply propylene bullets.

The third is again mounded bullet of smaller size for collecting propane returned from process plant for final disposal through road tankers - return propane bullet.

Regards

I am not sure too. But for me should remove o2 1st using n2 as to minimize the risk of fire.

[Bobby Strain]

If this is a new cumene plant, you can ask your licensor for help. But you will surely purge air with nitrogen, then purge nitrogen with propylene vapor. And you must adapt your procedure so that you don't chill the metal below it's capability. With multiple vessels, you might cascade the purges and reduce nitrogen and propylene requirements. You might also consider purchasing propane for purging nitrogen since it is cheaper than propylene. If you use propane or propylene to purge, you should introduce it at the bottom of the vessel and vent to the flare from the top vent. Best if the inlet and vent are at opposite ends, even when using pressure-depressure as a purge mechanism. Same is true for the nitrogen purge to remove air.

 

Bobby