3 replies to this topic

[soloweber]

From a process point of view, what determines the best option for Positive Isolation on Equipment from these options below or others

 

Closed Valve.

Closed Valve with Open Bleeder

Double Block and Bleed 

Block and Bleed with Line Break

Block, Bleed, and Spectacle Blind

Double Block and Bleed with Blind 

Double Block and Bleed with Line Break

 

Thanks in advance.

[Saml]

See this topic.

https://www.cheresou...ss-plant-design

[Technical Bard]

While closing two valves and voiding the space between them provides very good isolation and an ability to confirm isolation, it is not considered "positive isolation" because it is not certain.  Only a blind or physical removal of piping (dropping a spool) should be considered "positive isolation".   The need for valving and bleeds will depend on how much of the plant you want to depressuring before swinging a blind or spool.

[Perumal M]

Hi,

 

See this topic

 

https://www.cheresou...ion-guidelines/

 

Regards,

Perumal M.