4 replies to this topic

[black friday]

Hi All,

I'm trying to get the mass flow rate through a regulator (LT Gasetechnik 370100) from a LN2 storage tank, for sizing a PSV. Unfortunately the third party that provided the regulator is not being very helpful and the supplier is German, making support a bit difficult. The only data I have is the German manual, which fails to mention a Cv. It does however list Max. Leistung, which google reliably informs me is max capacity, as:

p2/p1 < 0,5:

bei p2=40 barü:

2100 Nm³/h

 

or as google translate puts it:

p2/p1 <0.5:
at p2 = 40 barg:
2100 Nm ³ / h

 

So if anyone could help interpret how to get my flow from this information it would be very helpful. If it listed this flow as at a specific upstream pressure I could just adjust the flow for the altered density depending on my actual upstream pressure, but I'm not sure how the downstream pressure in choked flow is useful to me. My upstream pressure is max 1929kPag. My downstream pressure is going to be the PSV set point at 750kPag.

 

Any help would be much appreciated.

 

PS: there is a vaporiser between the LN2 storage and the regulator so phase is going to be gaseous, not liquid.

[Bobby Strain]

Keep after the supplier, buy another, or use a big number.

 

Bobby

[black friday]

I'm still chasing the supplier but I was hoping to be able to get a calculation out without being limited by their tardiness. Time is a factor here for me, the sooner I order a valve the sooner I get it installed and we're back in compliance. Currently there's no PSV installed on this service.

[breizh]

Consider these resources to support your study .

 

 

Hope this helps 

 

Breizh

Attached Files

•  Selection and Sizing of Pressure Relief Valves.pdf   186.8K   18 downloads
•  safety valves calculation.pdf   1.45MB   14 downloads

[black friday]

Thank you for the references.