6 replies to this topic

[nikki-nikki]

I am very new to the industry. got one assignment for hazardous area classification. there is unloading tanker, two pumps and one atmospheric free vented tank. Fuel is methanol. on the tank there is a vent and level transmitter. and on discharge piping there is one pressure switch. i am just confused do i need to provide zone extent for LT and PS? are they source of release? following 60079.10.1 but i didnt find anything regarding level transmitter and pressure switch in examples.

[seuenergy]

Generally speaking, as LT and PS are installed on the body of tank. And the tank is used for storing methanol, both instrument should be ex-proof. 

[breizh]

Hi,

Documents attached.

https://www.heatinga...creased-safety/

EDIT:

Don't forget lightning protection.

https://www.methanol...eMethanol-1.pdf

https://oaktrust.lib...93831/Smith.pdf

 

Hope this is helping you.

Breizh 

[shvet1]

Depends on fitting. If an instrument has no joints and is connected to equipment sealless (e.g. welded) then this has no potential to ex-fluid release/leak. And vice versa.

Edited by shvet1, 25 May 2023 - 11:21 PM.

[nikki-nikki]

LT is flanged on fixed roof tank and pressure switch is in discarge of pump threaded.

Edited by nikki-nikki, 26 May 2023 - 01:11 PM.

[nikki-nikki]

@seuenergy..
so if they are ex proof..no need to so extent of zone?

[seuenergy]

hi,

 

An explosion proof zone should be drawn during project phase. And the instrument should be selected according to this document.

 

I don't mean that there is no need for zone classification. What I want to express is that these instruments should be ex-proofed from my feeling even I have not seen your zone.