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BTW: I looked up MIL-H-83797 Rev. A ( on EverySpec) for the AE701 (aeroquip/eaton) hose. It states a test at 250F filled with oil for 168 hours then pressure tested. I can not find any mention that AQP meets a test like this. I wonder if testing each year (or 100 hrs) at 3X oil pressures would be prudent. Would it just cause an unseen failure and be worse than doing nothing? Quote:
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Jim Irwin Email
I'm posting this because I'm incredibly impressed by the outreach efforts of Aircraft Spruce President, Jim Irwin. Jim saw this discussion on VAF and took the time to email me directly. We exchange a couple of emails and had a productive discussion about this topic.
I strongly believe that ACS provides the aviation market with high quality products. I am a BIG fan. My argument to Jim was that they might want to consider offering some products more tailored to the experimental market, especially hoses and fittings, that would still meet their high quality standards but might not have the same level of oversight, inspection, etc. that is necessary to get them into the certified market. Jim was receptive and said that ACS will look into this issue. I hope Jim won't mind me posting this. I'm really just trying to say how amazed I am that a President of ANY company, would be so in tune to his marketplace that he would contact a lowly whiner like me on such a minor issue. While I may shop elsewhere for some of my supplies, I would much rather buy EVERYTHING from ACS. Jim seems to have heard that argument. Thanks Jim! To close, I hope everybody knows that I'm a big, and now a bigger, ACS fan! Best regard, Randy |
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Randy---I just wanted to second that email that you received from Jim. As a hose assembly supplier to ACS, Jim and I have had the conversation about using 'reusables', or 'field installed' fittings as some call them.
Properly assembled, they are perfectly satisfactory for our experimental uses. Summit represents several hose and fitting vendors, and does have a variety of components to meet most every need. However, they are in a gray area where guys are making hoses for aircraft, much less experimentals. MOST hose and fitting manufacturers have expressed disclaimers against using their products in aircraft use. Use at your own risk, and dont tell anyone, and life is good. Have a catastrophic failure with injury, or worse, and all **** brakes loose. ACS is an Aeroquip distributor, although on the aerospace side. ACS may be able to acquire non-certified components, like those of a Summit, Jegs, etc, and supply them to those of you that want to go that route. I dont know what that plan is. But----I can tell you, and I'm sure Jim wont mind, he is very pro-active on this, and asked several questions on this subject. Jim is a businessman, but is also looking out for the well being of us AND his company. We are all looking to get the best product at the lowest cost. Some of those things are 'governed" by certain regulations, and some are not. I'm sure that Jim is addressing this and will make the best decision for all of us. Tom |
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Larry |
We use Parker hose at work (Washington State Ferries) on the diesel engines.
Lube oil hoses experience higher temps than the coolant hoses and fuel hoses, over 200 degrees in some cases. They do get stiff, even creak when you un-bend them. We have been upgrading to teflon lined hose in these cases. Some stiffening of hot oil hose is to be expected, the question is 'how much?' Also, I don't recall a stiffened Parker hose having ever failed in lube oil service, I just changed them because they were so stiff. Not a very satisfactory answer? Hoses have a limited service life. Changing them every 5 years is advisable, but who does that? You should at least inspect them for external damage, leaks and check for flexibility. And snug up on the fittings. |
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