Low visosity hydrolic fluid

Netmo · Dec 3, 2010

I am not sure if I am in the right place to ask my question. Since it the topic is hydralics, I am sure I can find some one with the right knowledge to help me with my problem.
I am looking for a hydralic fluid with low viscosity, I mean low anout 5 or less. This is for a new application. I am trying to create a pulsatile flow using a pump for a new application. It is low pressure application. Maximum pressure will be 5 PSI. Lowest is 1 PSI. I searched everywhere and I couldn't find any site for selecting a fluid low visosity. Any body has any sugesstions. many thanks if some one can help me.

J_J · Dec 3, 2010

Would this chart help?.

What reference are you using?

Fluid Characteristics Chart / Data, Density, Vapor Pressure and Viscosity - Engineers Edge

http://www.vp-scientific.com/Viscosity_Tables.htm

http://www.engineeringtoolbox.com/kinematic-viscosity-d_397.html

SPYDERLK · Dec 3, 2010

What about using a 0W-20 engine oil?
larry

AKKAMAAN · Dec 3, 2010

How about diesel oil?? Too thin??

Dakota_male · Dec 3, 2010

Netmo said:
I am not sure if I am in the right place to ask my question. Since it the topic is hydralics, I am sure I can find some one with the right knowledge to help me with my problem.
I am looking for a hydralic fluid with low viscosity, I mean low anout 5 or less. This is for a new application. I am trying to create a pulsatile flow using a pump for a new application. It is low pressure application. Maximum pressure will be 5 PSI. Lowest is 1 PSI. I searched everywhere and I couldn't find any site for selecting a fluid low visosity. Any body has any sugesstions. many thanks if some one can help me.

Transmission fluid can be purchased in many viscosity that are very low, something to think about.

mmurphy · Dec 4, 2010

Is there not a water soluable product that can be mixed with water???
Cutting fluids use such products that will lubricate and mix with water.

SPYDERLK · Dec 4, 2010

mmurphy said:
Is there not a water soluable product that can be mixed with water???
Cutting fluids use such products that will lubricate and mix with water.

I think the viscosity there is so low that sealing within the pump element would become a real issue, allowing a lot of bypass. Some pumps could handle it, but probably not a gearpump at hi pressure.
larry

mmurphy · Dec 4, 2010

SPYDERLK said:
I think the viscosity there is so low that sealing within the pump element would become a real issue, allowing a lot of bypass. Some pumps could handle it, but probably not a gearpump at hi pressure.
larry

At 5 PSI???? You could use a centrifugal pump, instead of positive displacement. I may be missing something here.

wdchyd · Dec 4, 2010

Netmo,

The best oil with low visc to my knowledge is Aircraft Hydraulic Oil

Mobil AERO HFA is what I use.........Texaco Hyd Oil #15 is another........

MIL-H-5606 is the Military spec for their use in low visc hyd oil.......

Other manufacturers have similar stuff just use the "5606" designation to convert to another brand.....

wdchyd · Dec 4, 2010

Also Kubota SuperUDT.......plenty available at your local dealer......

That stuff is very thin......

SPYDERLK · Dec 4, 2010

mmurphy said:
At 5 PSI???? You could use a centrifugal pump, instead of positive displacement. I may be missing something here.

I missed the 5 PSI. Hard to imagine that as a hydraulic application.
larry

mmurphy · Dec 5, 2010

SPYDERLK said:
I missed the 5 PSI. Hard to imagine that as a hydraulic application.
larry

I think we are missing what the whole concept is about. I was wondering also if this was a typo.

J_J · Dec 5, 2010

He only has one post. He may be playing with you guys.

Mace Canute · Dec 5, 2010

An ISO-VG(viscosity grade) Grade 22 hydraulic oil is equivalent to an SAE Crankcase Oil Grade 5W.

From Industrial Lubricants - Viscosity ISO-VG Grade

glastron23 · Dec 5, 2010

on our bucket trucks up here in Canada we use Exxon Univis J13, it's an aircraft hydraulic oil for cold weather. Some of the trucks that come from the southern states will use a 22 grade oil, put this at -25 and it flows like tar, we change all our trucks to J13 for year round service, it's a little thin for extended hot weather use but thats normally not a problem for us. Jim

Rocwin · Dec 7, 2010

In our bucket trucks the standard oil we use is a 22, we can a dyed blue (arctic) oil with a 15 weight to it for use in winter weather or pilot operated valves. I haven't seen anyone using lower, and I don't think I'd recommend it, you'll start to lose the properties of oil in general when you approach the viscosity of water.

glastron23 · Dec 7, 2010

Hi Rocwin... we work on your trucks (RH aerial) as well as others, posiplus, versilift, wajax, telsa, Utem, duralift, etc. for the last 20 years the only oil we spec is J13, the odd one will come in with ATF but that's mostly digger derricks.
We have very few problems with J13 unless some mixes in ATF, then in cold weather you will get tank foaming ( the base stocks are different and will not mix when cold) you may want to check the specs on the oil, you will be surprised at it's properties. Jim

PILOON · Dec 7, 2010

Meyers snow plows are a problem in cold weather.
Most users I know use automatic transmission fluid (ATF).*
Works great!

*ATF is hydraulic flud, just thinner than our tractor 'universal' type.

Mace Canute · Dec 8, 2010

Rocwin said:
In our bucket trucks the standard oil we use is a 22, we can a dyed blue (arctic) oil with a 15 weight to it for use in winter weather or pilot operated valves. I haven't seen anyone using lower, and I don't think I'd recommend it, you'll start to lose the properties of oil in general when you approach the viscosity of water.

FYI, the viscosity of engine oil when it reaches operating temperatures is very close to the viscosity of water.

Rocwin · Dec 8, 2010

Thanks Glastron23. I just took a look at the spec sheet for the J13 oil and ours performs a bit better. The J13 has a VI of 300 (resistance to viscosity change with temperature) while our MV15 is 356 and the viscosities are very comparable otherwise. Our normal oil MV22 does well with 253 VI for our temperatures, but like I mentioned there are issues with very small lines on some equipment. When the UTEM booms come here from Texas they'll put a 32 oil in them, we make sure to order those empty so we can put our own in, during winter they become unusable.

Engine oil and hydraulic oil serve two different purposes, hydraulic oil is used to transmit power while engine oil is used as a solvent and lubricant which is actually pretty close to water (without the rust.)