3 replies to this topic

[Rahimzadeh]

Dears:

What is your idea about safety shutdown valve by pass

Before and after shutdown valve need to be equalized with small diameter pipe or not ?Do know any standard for this matter.

 

Thanks in advance

M.R.Rahimzadeh

[fallah]

Mr. Rahimzadeh,

 

In general a SDV is authorized, in safety standpoint, having an equalization by pass line; a ESDV is not....

[Poosticks]

Why would you not want an equalization line?

 

I am no expert in this area but am generally interested. My understanding is that the equalization would reduce the opening torque meaning a smaller actuator which means the valve could be cheaper. And of course the opening / closing times would be more rapid.

 

So would you not have equalization in a SSDV and ESDV alike?

[hianbotech]

ESDVs can not be bypassed from the safety point of view. if a equalization line is needed, this line should have another ESDV installed  or lock closed block valve.

Edited by hianbotech, 26 November 2014 - 01:32 PM.