My anecdotal experience with spring washers has been that they do help maintain
bolt load. Solon Mfg is a major manufacturer with which I've dealt. A paper with
experimental data is listed on their website. I have it. It is very detailed
with beaucoups of empirical data. I have listed the link below.
What I don't know about is whether maintaining the pre-load also helps prevent
the nut from loosening. Intuitively, I would think that it would. But
conceivably, with spring washers on a loaded fastener, a mechanic could slowly
begin loosening the nut. As he did so, the spring washer would compensate and
maintain that pre-load -up to a point. Eventually, when all of the spring in the
washer was depleted (as well as the residual bolt tension), the mechanic would
have taken all of the load off the fastener. Do many of the problems discussed
previously (vibration, temperature cycling, etc.) tend to create an effect (like
the mechanic) of loosening the nut? I don't know.
Here's the link. Hey, they're on the pipingdesign.com website!
<a href="http://www.solonmfg.com/page.cfm?name=tech_docs">http://www.solonmfg.com/page.cfm?name=tech_docs</a><<a href="http://www.solonmfg.com/page.cfm?name=tech_docs">http://www.solonmfg.com/page.cfm\
?name=tech_docs</a>>
- Original Message -----
From: alejandroperezposada<mailto:alejandroperezposada@yahoo.com>
To: <a href="/group/PipingDesign/post?postID=dVLI2aYazmaXrA-ikgXEQNdAHjLdXQW3W02SqWgKgYeextF8jAWA4wDKp5M0ZlY_K1VT7vz2HH0I-RyotYat2vrvdw">PipingDesign@yahoogroups.com</a><mailto:<a href="/group/PipingDesign/post?postID=dVLI2aYazmaXrA-ikgXEQNdAHjLdXQW3W02SqWgKgYeextF8jAWA4wDKp5M0ZlY_K1VT7vz2HH0I-RyotYat2vrvdw">PipingDesign@yahoogroups.com</a>>
Sent: Tuesday, May 17, 2005 11:56 AM
Subject: [PipingDesign] Re: Bolting Loose
There is another equipment but with less capaciy and it has not
presented the problem. Is there a posibility in replace the ASTM A-193
GR B7 stud with a Machine Bolt Grade 8?
- In <a href="/group/PipingDesign/post?postID=dVLI2aYazmaXrA-ikgXEQNdAHjLdXQW3W02SqWgKgYeextF8jAWA4wDKp5M0ZlY_K1VT7vz2HH0I-RyotYat2vrvdw">PipingDesign@yahoogroups.com</a><mailto:<a href="/group/PipingDesign/post?postID=dVLI2aYazmaXrA-ikgXEQNdAHjLdXQW3W02SqWgKgYeextF8jAWA4wDKp5M0ZlY_K1VT7vz2HH0I-RyotYat2vrvdw">PipingDesign@yahoogroups.com</a>>,
Christopher Wright <chrisw@s<mailto:chrisw@s>...>
wrote:
>
> On May 17, 2005, at 10:46 AM, alejandroperezposada wrote:
>
> > We think that the problem probably is due to the variation cyclic of
> > temperature.
> Is there anything unconventional about the joint? do you have any
> similar equipment or different equipment subject to the same
> temperature cycling?
> Christopher Wright P.E. |"They couldn't hit an elephant at
> chrisw@s<mailto:chrisw@s>... | this distance" (last words of Gen.
> .......................................| John Sedgwick, Spotsylvania
> 1864)
> http://www.skypoint.com/~chrisw/<http://www.skypoint.com/~chrisw/>
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Received on Fri May 20 01:44:00 2005