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evapcoil
08-01-2012, 02:41 PM
Hello Everybody
I have a question and I hope I posted in the right forum, I need to install some Sporlan ORIT 15/20 constant evaporator pressure valves, they require an high pressure pilot line, but the engine room is faraway from the installations, so I was wondering if I can use the liquid line before the expansion valves for this purpose.
Can anybody help?
Thank You very much.

The Viking
08-01-2012, 02:59 PM
Externally Pilot Operated Valves (S)ORIT-12, -15,and -20: Pressure Regulating Operation: These pilot operatedEPRs use high side pilot pressure to control the main valvepiston that regulates upstream/inlet pressure. The high sidepressure source allows this valve to be provided normallyopen. This allows the valve to be operated at minimal pres-sure drop to ensure maximum capacity by minimizing suc-tion line pressure losses. The high side pressure source mustmeet the following criteria to ensure optimum performanceof the pilot operated pressure regulating valve:


Only refrigerant vapor should be used as the high pres-sure supply source to the pilot valve.
The pilot supply line should be kept as short as possibleto minimize refrigerant condensation.


So I would say that the answer to your question is NO, it does require a high pressure vapour supply...
And further more, the selected valve is probably not suitable for your application.
Sorry

evapcoil
08-01-2012, 05:47 PM
Thank You Viking

evapcoil
08-01-2012, 05:48 PM
I had read the part of the manual you are mentioning, I was hoping to hear from somebody that had took the risk of play with the word "should" present in the sentence

evapcoil
09-01-2012, 06:02 PM
Can anybody help suggesting which type/brand of valves should I use instead of the above mentioned valves (it seems they are not suitable for my needs) to regulate the evaporating pressure of some medium capacity evaporators? They are locate quite far away from the engine room so high pressure vapours are not an option, and regular Danfoss KVP line cannot cover the capacity I need....

chemi-cool
09-01-2012, 06:37 PM
Look for KVP
http://www.danfoss.com/NR/rdonlyres/EF15B798-06E7-46AF-BBB7-82BE13B6DA13/0/PFH00A102.pdf

Look at IRP
http://www.actrol.com.au/WebSite.nsf/d974154241089741ca256cde000dcd9c/634211D12C8C906ECA256CE0000C62D4/$File/alcoregweb.pdf

Try google sometimes, great help...

evapcoil
09-01-2012, 07:57 PM
Hi Chemicool, Thank You for your answer but, as I said in my post, KVP valves are too small for my needs, I had consider them and discarded the option, that's why I was asking for some more option...
And also thank you for the suggestion of this "google" thing, I nver heard of it, I'll check it out... :-)

monkey spanners
09-01-2012, 08:13 PM
Could you run two KVP valves parrallel to each other?

The Viking
09-01-2012, 08:14 PM
Evapcoil,

It's somewhat hard for us to come with suggestions when we haven't been given any of the design parameters apart from that the valves has to be installed far from the hot gas pipe...

The best anybody can do under these circumstances is to point you towards the manufacturers information so that you who have the design criteria can make the selection.

The Viking
09-01-2012, 08:17 PM
Could you run two KVP valves parrallel to each other?

OR
Run the individual suction lines back to the engine room?

evapcoil
09-01-2012, 08:27 PM
Hello again everybody
I'm sorry for the lack of information in my post, I'll try to give you some more details on the problem I'm trying to solve:
wanted evaporation temperature 0-2C , suction pression/temperature on compressor -17C
coil type A cooling capacity 42Kw, suction line leaving evaporator 42mm CU
coil type B cooling capacity 16Kw, suction line leaving evaporator 35mm CU
coil type C cooling capacity 11Kw, suction line leaving evaporator 28mm CU
Again thank you everybody for your help and I apologize for the lack of info in my previous posts

chemi-cool
09-01-2012, 08:42 PM
This is a long shot but i was playing with the idea of using EXV with controller such as Dixell XEV.

You can control the amount of refrigerant in each coil via the EXV or an SV on the liquid line and/or the suction line.
Any thoughts?

The Viking
09-01-2012, 08:43 PM
So all three evaporators are to be running under similar conditions, at around 0-2*C?

evapcoil
09-01-2012, 08:47 PM
Yes Viking but they are located in different and far from each other location on the ship and have separate pipe lines going down to the engine room...
I'll look in to your suggestion....
Thank you though... :-)

The Viking
09-01-2012, 09:03 PM
have separate pipe lines going down to the engine room...


OR
Run the individual suction lines back to the engine room?

Now, there is a thought...

Why then can't the ORIT valves be located in the engine room???

evapcoil
09-01-2012, 10:16 PM
I think I found the solution: ORIT-PI-2/-3/-4
This should work... :-)
I can't put them in the engine because the pipes from these equipments join some other lines few decks above the engine room... It's quite a complicated and interconnected plant...

Brian_UK
09-01-2012, 10:39 PM
Do we assume that you are getting your info from the Sporlan Literature website ?

Such as this... http://www.sporlanonline.com/90-20-2.pdf

From here... http://www.sporlanonline.com/literature.shtml

evapcoil
09-01-2012, 10:50 PM
Yes Brian, I was reviewing that document, why? is it not reliable?

The Viking
09-01-2012, 10:53 PM
Evapcoil,

It's somewhat hard for us to come with suggestions when we haven't been given any of the design parameters apart from that the valves has to be installed far from the hot gas pipe...

The best anybody can do under these circumstances is to point you towards the manufacturers information so that you who have the design criteria can make the selection.


Hello again everybody
I'm sorry for the lack of information in my post, I'll try to give you some more details on the problem I'm trying to solve:
wanted evaporation temperature 0-2C , suction pression/temperature on compressor -17C
coil type A cooling capacity 42Kw, suction line leaving evaporator 42mm CU
coil type B cooling capacity 16Kw, suction line leaving evaporator 35mm CU
coil type C cooling capacity 11Kw, suction line leaving evaporator 28mm CU
Again thank you everybody for your help and I apologize for the lack of info in my previous posts


I think I found the solution: ORIT-PI-2/-3/-4
This should work... :-)
I can't put them in the engine because the pipes from these equipments join some other lines few decks above the engine room... It's quite a complicated and interconnected plant...


:rolleyes:

evapcoil
09-01-2012, 11:32 PM
What had I done of so horrifying? I know I might had been short on details, and I apologize for it but it is not easy to try to explain a system where we have three separate systems (positive temperature, low temperature and cooling back up for technical spaces) working with 4 compressors that can work with all the three system through a connecting manifold...
On ships We have different needs than a regular system on land where space is not an issue... Here everything is compressed.. Saying this I'm not intending to offend anybody but in the mean time I find the ":rolleyes:" face a bit out of place...

Brian_UK
09-01-2012, 11:45 PM
Yes Brian, I was reviewing that document, why? is it not reliable?No, not at all, I was just checking that we were reading the same documents. ;)

750 Valve
10-01-2012, 09:32 AM
Danfoss PM Valve?

http://www.ra.danfoss.com/TechnicalInfo/Literature/Manuals/01/PDHL0A122.pdf

evapcoil
10-01-2012, 12:45 PM
Well, 750 valve, thank you very much fior your suggestion, it seems it can work with the example configuration 1-1 :-)
Thank you very much for the new prospective!