RE: Epoxy Coating of inner & outer ring of Spiral Wound Gaskets

From: <Masand>
Date: Thu Mar 22 2007 - 01:14:00 EDT

Mr. Wright

I already asked customer and there is no reply so far, probably someone wrote the spec 15 years back & no one knows why is this requirement specified. I asked the vendor as well and I wasn't satisfied with his reasoning. So I thought of putting this up to the forum to stir up some technical discussions. I believe no technical question is a silly question but if not asked makes a man silly and when rebuffed makes whole forum silly.

Regards,

Girish Masand
Perth, WA

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From: <a href="/group/PipingDesign/post?postID=Nj35VEFsgBWWDgDD8qdn4SAVpV9kJmAi7Noi83_YRHc82TDGNiUVYwWzV57wejdR3Z685HheaDFV_vj67ly0MXjxng">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=Nj35VEFsgBWWDgDD8qdn4SAVpV9kJmAi7Noi83_YRHc82TDGNiUVYwWzV57wejdR3Z685HheaDFV_vj67ly0MXjxng">PipingDesign@yahoogroups.com</a>] On Behalf Of Christopher Wright
Sent: Thursday, 22 March 2007 12:24 PM
To: <a href="/group/PipingDesign/post?postID=Nj35VEFsgBWWDgDD8qdn4SAVpV9kJmAi7Noi83_YRHc82TDGNiUVYwWzV57wejdR3Z685HheaDFV_vj67ly0MXjxng">PipingDesign@yahoogroups.com</a> Subject: Re: [PipingDesign] Epoxy Coating of inner & outer ring of Spiral Wound Gaskets

On Mar 21, 2007, at 8:59 PM, Masand, Girish ((Perth)) wrote:

> One vendor has come back with his proposal to use Epoxy coating
instead
> of Zinc plating. Those having knowledge on this subject please advise
> regarding this change proposal. Does Zinc plating cause any problems
> during service life?

Ask your customer, not the list. If your customer specified zinc plating they probably have a good reason to do so. Don't forget you're eventually going to have to explain the deviation from their spec, and you're going to look awfully pathetic if all you can say is that you heard it on the Internet from someone you never met, whose qualifications you never checked. You should also get back to your vendor and and find out why they want to use epoxy. If the only reason they can give is that they can't supply zinc plating, thank them nicely and find someone else to supply the gaskets. Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=MEMOtdfZUlU6LWHjYM5rUEwlU8uzGi25GAtyNgSxaVSyJ27qbnNWK2NOnPVxpVrC8CXXpIEiz7Lu">chrisw@skypoint.com</a> <mailto:chrisw%40skypoint.com> | this distance" (last words of Gen.

.......................................| John Sedgwick, Spotsylvania

1864)
<a href="http://www.skypoint.com/~chrisw/">http://www.skypoint.com/~chrisw/</a> <<a href="http://www.skypoint.com/~chrisw/">http://www.skypoint.com/~chrisw/</a>>

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[Non-text portions of this message have been removed] Received on Thu Mar 22 01:14:00 2007