Hydraulic Hand Pressure Calibrators

Usually the devices you connect to for test and calibration have some effect. Oil does not freeze, water does. Oil does not expand as you pass downscale of the freezing point, water does. Water corrodes brass/copper tubes. Stainless is fine for these. Cost is often a determinant of pressure meter makers.

If you are pressure testing a water filled tank, you would use a water filled test system, because if it leaks you do not want oil in the tank for contamination or later welding of leaks where oil may vaporize and burn

it could be nit picking. Water does not corrode brass and copper.

water does indeed corrode brass and copper. Admiralty bronze and many bronze alloys are corrosion resistant.

Inspect a copper pipe, it will be lined with corrosion and domestic water pipes corrode through in as little as 50 years or so - depends on water chemistry, velocity etc.

http://en.wikipedia.org/wiki/Erosion_corrosion_of_copper_water_tubes

No rust forming in the unit being tested.

Good Luck, Old Salt

If you used a tester with water on a component used with oil you would have to dry the component before use.

Hi All,

Oil is best to hydraulic hand pump?, reduce corrosion.

water does.

Regards

Hi,

Unless contamination is an issue, I prefer using water in my hand pump it's less messy than oil, and can be refill anywhere, I haven't had any corrosion problems, I only pressure up small sections of three eighths or one quarter inch tubing so the difference in expansion is not a problem.

thanks

No corossive