Think about this for a moment. What would keep tension on the wire?
One thing, the weight of the pipe. This means that the wire has to be
allowed to carry a certain amount of the weight of the pipe. I would
check the breaking strength of the wire, but I would assume that it
could probably hold more than you think. The solution may be as
simple as loosening up the knerl nut a turn or two (unless it's 40 ft
in the air; then nothing is simple)
As to what would cause it to loosen up over time, what about thermal
changes from when it was installed to now. Was it installed and set
cold and is now in a heated building? If so, the wire might have
expanded differently than the rest of the system, causing slack.
Also, have the upper or lower supports secure? Is there evidence of damage?
At 12:47 PM 2/2/2007, you wrote:
Generally The "Wire Rope systems are "Tension Only" systems. These
are intended to be under tension in all directions at all times to
prevent movement of the pipe. If you have "Slack" you aren't
preventing movement. Call the MfG of the product your using and get
their take on it. It's their engineering that the product
installation is based upon, have them review the installation and
placement for this application.
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message ----- From: "Richard Battershell"
<[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, February 02, 2007 10:06 AM
Subject: Seismic bracing - wire rope
How much , if any, slack is allowed in wire rope used for seismic bracing?
Our fitters install the product we are using according to the manufactures
directions and recommendations, but after a period of time (days/weeks) you
can see slack in some of the braces particularly the lateral bracing. I
believe this is caused by the pipe getting knocked around by other trades
during the installation of their work. In any case the fire marshal has
questions that I need to be prepared to answer. Please help.
Thanks in advance.
Richard Battershell
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Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
860-535-2080
www.fpdc.com
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