8 replies to this topic

[sunil_chemical]

Dear All,

Can anybody tell me, What is steam blow back in Pressure Relief Valve?

Any creteria for that please if you have anything related to this information share with me.

Thank you.

[fallah]

Dear All,

Can anybody tell me, What is steam blow back in Pressure Relief Valve?

Any creteria for that please if you have anything related to this information share with me.

Thank you.

I am not sure,but may be the event happened when:

Buld-up pressure+Superimposed back pressure > Set pressure+Overpressure

[JoeWong]

Dear All,

Can anybody tell me, What is steam blow back in Pressure Relief Valve?

Any creteria for that please if you have anything related to this information share with me.

Thank you.

Sunil,
Where you heard about this sentence ?
Can you copy this sentence or paragraph so that we can interpret it ?
Can you please provide more information so that we can help ?

[sunil_chemical]

Hello,

Thanks After 3 days I got reply from somebody,

Actualy it is written in Saudi Aramco Standard like this "For PRVs in fouling services, provisions shall be made for steam blowback or other means of heating" So as per my opinion. It is for cleaning perpose when PRV is provided in Fouling Services. I Don't know, But this is as per my Opinion.

Please if you have any other ans regarding this, share more information.

Thank you.

Dear All,

Can anybody tell me, What is steam blow back in Pressure Relief Valve?

Any creteria for that please if you have anything related to this information share with me.

Thank you.

Sunil,
Where you heard about this sentence ?
Can you copy this sentence or paragraph so that we can interpret it ?
Can you please provide more information so that we can help ?

[JoeWong]

"For PRVs in fouling services, provisions shall be made for steam blowback or other means of heating"[/color] So as per my opinion. It is for cleaning perpose when PRV is provided in Fouling Services. I Don't know, But this is as per my Opinion.

I guess it mean provision of steam (I have seen water flushing) connection UPSTREAM of PSV, back flow to vessel to avoid potential PSV flow reduction and/or blockage. This is particular useful for system with polymerization, solidfication, etc that potential reduce and/or the PSV inlet line. Generally RD (or upstream or PSV is provided for this service.

Subject to fluid characteristic, insulation and heat tracing may be considered. Read more in Concerns & recommendation PSV inlet (click)

[Qalander (Chem)]

"For PRVs in fouling services, provisions shall be made for steam blowback or other means of heating"[/color] So as per my opinion. It is for cleaning perpose when PRV is provided in Fouling Services. I Don't know, But this is as per my Opinion.

I guess it mean provision of steam (I have seen water flushing) connection UPSTREAM of PSV, back flow to vessel to avoid potential PSV flow reduction and/or blockage. This is particular useful for system with polymerization, solidfication, etc that potential reduce and/or the PSV inlet line. Generally RD (or upstream or PSV is provided for this service.

Subject to fluid characteristic, insulation and heat tracing may be considered. Read more in Concerns & recommendation PSV inlet (click)

Dears
Actually such practices are necessary/mandated

where the material (usually in gas/vapors form at high pressures) having entrained particulates of semi solid or highly viscous nature

capable of fouling/ restricting available flow cross-sectional area are handled/routed into
the depressurizing /pressure relieving Flare systems Networks to ensure the integrity and functional sustainability throughout.

Hope this helps
Regards
Qalander

[sunil_chemical]

Hi,

Thanks for the replying, yaa it is very useful, but can you give some example, like in which system, these type of Provision is made. Fouling service is O.K, But have u seen this type of Provision in any system or process, Like CDU, or very High fouling services, Bcs i have never seen such kind of Provision.

If you have then it is very useful information for everybody.

Thanks

"For PRVs in fouling services, provisions shall be made for steam blowback or other means of heating"[/color] So as per my opinion. It is for cleaning perpose when PRV is provided in Fouling Services. I Don't know, But this is as per my Opinion.

I guess it mean provision of steam (I have seen water flushing) connection UPSTREAM of PSV, back flow to vessel to avoid potential PSV flow reduction and/or blockage. This is particular useful for system with polymerization, solidfication, etc that potential reduce and/or the PSV inlet line. Generally RD (or upstream or PSV is provided for this service.

Subject to fluid characteristic, insulation and heat tracing may be considered. Read more in Concerns & recommendation PSV inlet (click)

Dears
Actually such practices are necessary/mandated

where the material (usually in gas/vapors form at high pressures) having entrained particulates of semi solid or highly viscous nature

capable of fouling/ restricting available flow cross-sectional area are handled/routed into
the depressurizing /pressure relieving Flare systems Networks to ensure the integrity and functional sustainability throughout.

Hope this helps
Regards
Qalander

[JoeWong]

PVC reactor, blowdown drum, etc expose to PVC solid...
CDU, i have not seen with my limited experiences

Hopeful those members with Refinery experience can jump in...

[Qalander (Chem)]

PVC reactor, blowdown drum, etc expose to PVC solid...
CDU, i have seen with my limited experiences

Hopeful those members with Refinery experience can jump in...

Although not exactly recalled, but somehow I envisage that

'Propane De-Asphalting Unit extractor's Vapor phase relieving valve' may form an exemplary situation as Asphaltic residues tend to heavily clog the systems rendering these almost non-functional.

Hope this is helpful.

Regards
Qalander