How many comps on circuit?

This topic has 15 replies, 9 voices, and was last updated 17 years, 3 months ago by magician2000.

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July 11, 2007 at 6:06 pm #862

flyingduck
Participant

Hi all!

Would appreciate any comments/ expertise on the following regarding compensation:

How does one know how many el. comps to add on a system?

Cheers

Duck

July 11, 2007 at 6:31 pm #12828

subseascott
Participant

Assuming you’re asking about hydraulic comps here the volume in your compensator would likely vary depending on how big the reservior you’re looking to compensate is & how deep your max bottom depth’s likely to be?

July 12, 2007 at 6:07 am #12829

flyingduck
Participant

Hi Subseascott

Thanks for the reply.

It was electric comps I meant.

July 12, 2007 at 9:06 am #12830

Andy Shiers
Participant

Junction box ? or thruster comps ?
Where in the system are you wishing to put them ?

July 12, 2007 at 9:17 am #12831

truered
Participant

if its the electrical side ie j/b’s, electric motors or isolated coupling housings then as the oil is static (not circulating) a 2.5ltr comp would do set at 15psi , been like that for many years although some systems are set at lower pressures

the only thing to watch on the motor side is oil expansion watch the amount of oil you put in specially if you don’t have releif valves.

July 12, 2007 at 10:56 am #12832

David Grant
Participant

Duck,

Always a good idea to have separate comps for JBox, Elect motor and coupling housings.

Jbox – you dont want any contamination getting in here
Elect motor – Usually a different oil than Jbox oil.
Coupling Housing – these tend to get a bit milky.

Best would be to have a comp for each JBox, if not then make sure you have an isolation valve so you dont have to drain other comps down.

After you’ve finished and filled the JBox dont forget to open the iso valve ! 🙂

July 12, 2007 at 11:26 am #12833

Scott Beveridge
Participant

if its the electrical side ie j/b’s, electric motors or isolated coupling housings then as the oil is static (not circulating) a 2.5ltr comp would do set at 15psi , been like that for many years although some systems are set at lower pressures

the only thing to watch on the motor side is oil expansion watch the amount of oil you put in specially if you don’t have releif valves.

Make sure you put on adjustable PRV’s

July 12, 2007 at 1:44 pm #12834

flyingduck
Participant

🙂

Guys

Thanks for the answers.

Adjustable PRVs are on set at 10psig.

We have a double comp for the lot (ie. thruster manifolds, motor, and boxes) because the rov has to go and theres no time to fix it up ideally. I was just wandering if this might be a problem. I appreciate the problem regarding contamination from motor especially if its on its way out but I was also thinking in terms of pressure loss from the springs in the comp covering such a big volume even though its a small amount of pressure.

July 12, 2007 at 3:07 pm #12835

Anonymous
Guest

🙂

We have a double comp for the lot (ie. thruster manifolds, motor, and boxes) because the rov has to go and theres no time to fix it up ideally. I was just wandering if this might be a problem. .

Holy shit good luck on that job, you are sitting on a train wreck about to happen. Scorpios have similar systems (well the old ones anyway) and they always have issues with it. I would be asking for 4-5 one litre comps to be sent out asap……

July 12, 2007 at 8:35 pm #12836

subseascott
Participant

Think you might be pissing in the wind with that one mate but fingers crossed!! Older thruster shaft seals are especially bed for contamination & once the oil dialetric in the boxes becomes negligiable you’re in a whole world of pain with water alarms & worse!!!
I would use as many filters as possible in that situation if I had to run it as was. Take a look at Cardev’s, brilliant for water seperation / removal 😆
What type of system are you using out of interest?

July 13, 2007 at 1:57 am #12837

effinreps
Participant

What type of system are you using out of interest?

A prehistoric piece of sh1t would be my guess. I have never heard of a vehicle with elect and hyd on the same comp. Could it be a home build, designed by someone who has never worked offshore. Or maybe by a certain idividual who used to work for Racal Abz as a so called design engineer. A fine practitioner of ‘heath robinson engineering’ 😀 😀 😀

July 13, 2007 at 2:03 am #12838

Anonymous
Guest

Hi
Please tell us how it goes, if nothing goes wrong,,,, you are the man,
if it goes wrong,,, you have had a lot of warning here.

August 3, 2007 at 1:55 pm #12839

flyingduck
Participant

guys

Sorry it took so long to respond. Ive been on holiday pissing it up and yes probably pissing in the wind once or twice to.

Just to finish off something I started.

The ROV is a triton. There is a cardev filter on the hydraulic side. The hydraulic system is seperate from the el system. Not that bad honest!

The system being comped with two comps is: Motor, J box, term box, camera box, survey box and Mcartney term box. Hydraulics and thrusters are seperate. All in all, I think 5 boxes inc. motor.

Im aware that the motor should be comped seperate.

The question I basicall posed was how do I know that there is sufficient comp pressure to deal with all items at op. depth of fro example 2000m?Obviously there is pressure loss with a larger surface area.

Am I being an Ant fucker as the dutch politely call it?

I will keep you informed deepdown if I ever hear from it again and thanks to all the responses. 😯
regards

duck

August 30, 2007 at 10:00 am #12840

magician2000
Participant

Think you might be pissing in the wind with that one mate but fingers crossed!! Older thruster shaft seals are especially bed for contamination & once the oil dialetric in the boxes becomes negligiable you’re in a whole world of pain with water alarms & worse!!!
I would use as many filters as possible in that situation if I had to run it as was. Take a look at Cardev’s, brilliant for water seperation / removal 😆
What type of system are you using out of interest?

Scott…
I have need for a good filter system (it is for my personal boat). She is hyd drive and the idiots that put the system in never put a filter/water separator into the design. The engine that drives the pump is an old Perkins 4236. I’m a Electronics guy, and my limit on hyd/mechanics is keeping the fluid topped up, and the filters changed. But I would like to have my pump and motor last.
Cheers…

August 30, 2007 at 10:04 am #12841

Andy Shiers
Participant

Strange ROV 😕
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