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hydralic system fittings

hydralic system fittings

hydralic system fittings

is there a pressure boundary standard for hydraulic and pneumatic pipe/hose and fittings?

do these systems need to registered or conform to ASME?

RE: hydralic system fittings

There are loads of pressure boundary standards. And if you want to sell a hose or fitting to someone..legally, they have to conform to the relevant standard.

The stadards are set by hose size, type, application, fluid medium plus others factors...

Most hoses are made to an SAE spec, but other specs also apply.

The same goes for fittings, although the working pressure is governed more by the size. The bigger the fitting the lower the pressure rating.

Most fittings ultimately conform to ISO spec's and there are lots of different ones as well, again depending on application and material.

Parker.com is a good place to start looking as they pretty much own everthing hydraulic these days...


RE: hydralic system fittings

What hydromech states is certainly true for the United States of America. However, there are well over 100 other countries in the world, and in these, different standards may apply, some based on SAE, ASME, DIN or ISO, some not. While a significant part of the world's industry is US-based, it's not 100%. Be aware that US-based standards and specs may not be applicable, legal, understood or welcome outside North America. There is life elsewhere.

RE: hydralic system fittings

Indeed there is life outside the US...I live and work in England.

Can suggest that you read my reply again..?

I have generalised and explained that the spec's change depending on application. However most industrial hydraulic hoses, that is excluding special purpose hose for synthetic fluids, conform to an SAE spec.

The same goes for fittings. In the list of specifications that each fitting conforms to the 3 letters that appear more than any others are I,S and O.


RE: hydralic system fittings

Standards are sometimes ignored such as the 3000PSI rating for a 37 degree JIC. Some of the units where I work have ground drive circuits above 5000 psi and the connections are 37 degree JIC. Even hoses are utilized beyond the "standard" pressure allowing more flexibility of the hose. When this is done data is collected about the operating conditions and with the help of the hose and fitting manufacturers application approval is received.

RE: hydralic system fittings

I am not aware of any ASME pressure piping code covering hydraulics, and have never found anyone who could point out that they did. I have a copy of the first U.S pressure piping code from 1935, and it SPECIFICALLY states that this code does NOT apply to hydaulics. I am currently several thousand miles from this publication, so I cannot provide the specific wording, but hydraulic piping was not included from the get-go as far as ASME was concerned, and as far as I can tell, still isn't.

RE: hydralic system fittings

ASME only applies for the use of NPT threads.


I have not seen it in use any where else.

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