Formula for Compound Compression Interstate Pressure

Let me be the first to congratulate you for your unbridled audacity.

You insulted many members who could have helped you and you still want them to do your homework for you? Good luck with that!

If you can't find the answer by using a search engine, they have a class for that, too.

How to Use a Search Engine to Search the Internet

Or, you could always ask the ICC.

It's not on Google! But would of rather had an educated person answer the question not a rookie who works at 7-11. Glad you found work but let's have an educated person chime in Lyn sorry mam! Maybe you can chime in alon an easy question

The question can not be answered until it is understood what the question is. Maybe Tornado is right. But who knows.

Interstate, Interstage inter something.

Its in your hands. Make it count.

Spreek Engwish!!!

From your CR4 Bio

"Lyn loves cleaning toilets at 7-11 due to poor education! Don't be a Lyn!"

Seriously? And you want the CR4 community to take you seriously.

You post homework questions with little context and then get defensive when people don't take your questions seriously thinking you are clueless and want help with your homework which you don't appear to understand (again based on your short and in somewhat broken English posts).

Perhaps you should grow up and look at yourself rather than posting insults and being childish. We know a great deal about Lyn and his knowledge and abilities but very little about you or your motivations and hence will side with him over you any day.

In future please put more care into explaining your questions, especially those that look like homework so misunderstandings on our part do not occur. And delete that inflammatory Bio of yours before I put in a complaint against you.

I agree that a good education is worth the effort.

Believe me, it's no fun cleaning toilets at 7-11, or anywhere else I guess.

I just put my rubber gloves and face mask on and pretend I'm doing brain transplants.

Don't be a Lyn.

Interstage psia = (low stage psia * high stage psia)^1/2

Sorry. I don't understand the question.

I guess a internet search is off. I tried:

"compound compression interstate pressure"

And all it gets to is CR4.

What is the question?

Suction vapor entering the low stage is only partially compressed to the final condensing pressure. Thus, discharge from the low stage becomes the suction of the high stage, which finishes the compression. You should be able to take it from there... you know... since you're so much smarter than the rest of us.

Oh... and it's not 'interstate' it's inter-stage pressure (aka intermediate pressure).

And GA Tornado! Should have read all the replies prior to posting, haha

An externally compounded system can be quite intimidating to the uninitiated...and it appears that have been the case there. Thanks for detailing that fateful night. For a market rack, the interstage pressure is basically whatever is required for your high stage, or your lowest medium temp circuit. Set up the MT just like you would for a normal system. As an aside, if this were a straight low temp system like for a freezer warehouse with no MT loads at interstage pressure, the ideal interstage pressure is one which gives you equal compression ratios for both the low and high stage. To determine this, there's a simple formula: P interstage = SQRT

(NOTE: Pressures are absolute pressures...ie, PSIA) That pressure regulator was a differential regulator I think. I never got directly involved in setting one up, but as I understand it, the setting should be just below the normal low stage pressure differential. So if you have a -30ºF low stage suction (5 psig) and a +20ºF interstage (43 psig) the difference would be 38 psi. The regulator would probably be set around 33 psid or so

You left out most of the formula, which is rather quaint since it has already been given in the discussion.

K