Hi I'm Eddie Lowe with McWane Ductile. Sales representative for South Carolina
and East Georgia. You're probably wondering what this guy is doing over
here right? Well he's actually demonstrating how many and where
restrained joints could be in your ductile iron pipe line. Welcome to this edition of Iron Strong.
What are you doing? Keep wiggling I got some more explaining to do here.
<sighs> Good help is hard to find. Based on the simple things known about
your pipe line such as size of pipe, depth of cover, design pressure, trench
type, soil conditions, plus the single most important contributor is what type
of fitting is involved? Why because fittings are a quick change
in pipeline direction which means the water inside follows that same change in
direction. Change in flow direction creates a force that wants to separate
the fitting and some number of joints on either side of it much like the force
you feel riding a roller coaster downward with a quick turn to the left
your body starts going to the right but the bar you're holding on to with the
death grip prevents it that's what restrained joints do for a pipe line.
Everywhere you see this rope being anything other than straight is what we
call the wiggle zone. If this rope for a pipeline every joint in the wiggle zone
is prone to separate.
In this case based on the design variables we listed
earlier the wiggle zone is 85 feet long.
So every joint in this area needs to be secure,
between the marks by using restrain joint pipe or restraining
gaskets in standard ductile iron pipe
85 feet divided by 18 the nominal cast length of our pipe equals 4.72 pieces.
Which means the last five pipe in and the first five pipe out
of the fitting must be restrained. The wiggle works both ways coming and going
and don't forget both sides of the fitting must be restrained as well. You
can find out more in the Iron Strong blog. So there you go we've answered the
how many and where questions for restrain joints on a single fitting to
do this quickly for all fittings in your pipeline go to the McWane Pocket
Engineer thanks for watching this episode of iron strong for more
information on all things ductile please visit our web site or contact one of our
product engineers until next time remember to work hard work smart and work safe.

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