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RE: Fire Sprinkler Thrust Loads

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As a free-body diagram will show, the thrust would be taken through the pipe
wall in longitudinal tension, as long as there are no unrestrained joints in
the pipe.

	-----Original Message-----
	From:	Joshua Matthews [SMTP:base.engr(--nospam--at)internetMCI.com]
	Sent:	Saturday, October 17, 1998 11:05 AM
	To:	seaint(--nospam--at)seaint.org
	Subject:	Re: Fire Sprinkler Thrust Loads

	I recently spoke with a friend who is a contractor who was being
requested to
	verify that a new metal building that they had constructed be
checked for
	"thrust" loads in the plumbing of the fire sprinkler system.  The
plumbing is
	braced back (and checked) to the structure for seismic loads but
Factory
	Mutual has requested that it be checked for "thrust" of the water
moving
	through the system (particularly at bends in the plumbing). It would
seem that
	most of the forces in the plumbing would be resolved within the
plumbing
	itself and not be exerted on the structure (two opposing bends might
create
	tension in the pipe)

	I have not heard of this before, has anyone else had this question
come up or
	have any experience with this situation?

	Any comments would be appreciated.

	Joshua Matthews