Tube Products International March 2015

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March 2015 Tube Products International 63
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Plastic pipe coupling
Teekay Couplings has launched the
Plastlock Pipe Coupling. Enabling
simple, rapid and permanent joining of
plain-ended plastic pipes, the product
will increase the ability of engineers to
specify plastic pipes in projects.
Key to the new product’s capability is its
patented dynamic axial restraint system,
which locks plastic pipes together
without the need for gluing, heat fusing,
flanging or pipe inserts. The system has
two pipe wall gripping rings that adapt
to higher levels of load as pressure in
coupled pipes increases. These rings
rotate on the pipe surface under higher
loads, increasing the area gripping the
pipe and reinforcing the seal.
This design concept follows through
into the pipe anchoring mechanism,
which includes three anchor rings at
staggered heights. A chamber between
each ring allows the pipe wall to migrate
around the area where each anchor ring
engages with it. These features allow
for a dynamic lock on the pipe, ensuring
all rings are continuously in contact
with the pipe wall, resulting in a hold
that permanently locks the two pipes
together.
“By simply butting two plastic pipes
together and connecting them with
a Teekay Plastlock Pipe Coupling,
engineers can create a permanent
coupling in an extremely short period
of time and with a structure that is
often stronger than the plastic pipes it’s
connecting,” said Ian Webb, director at
Teekay Couplings. “This should be seen
as a significant new product. Plastic
pipes have a multitude of potential
applications in engineering.”
With other methods of plastic pipe
joining, heat fusion or gluing, the cure
time prolongs installation and delays
testing and commissioning. If cure times
are not closely observed, leaks at the
joints can start to appear prematurely.
Hot working and fumes created by
gluing also present risks.
Plastlock is designed to work with a
wide range of plastics used in piping,
including polyethylene, polybutylene,
polypropylene, PVC-C, PVC-U and
ABS. The range includes 15 different
sized couplings, to fit pipes with outside
diameters from 25 to 315mm.
Couplings to fit plastic pipes outside of
the standard range can be manufactured
to order. Plastlock is engineered to
conform to WIS-4-24-01 and BS 851:
2103 standards, and minimum burst is
four times working pressure.
Teekay Couplings Ltd – UK
Alloy steel
fittings
supplied for
chemical
plant
Interservice Trading BV completed a
substantial part of the Aquarius project
for Shell Chemical Plant at Moerdijk,
Netherlands, towards the end of 2014.
The supply consisted of seamless BW
fittings in alloy steel ASTM A 234 WP22,
with mostly heavy wall thickness SCH
160. It also involved all of the extra
testing required by the client. All items
were supplied ex IST-stock.
IST states that it is well known for its
stock of special BW fittings, all from
approved PED manufacturers in the EU.
Interservice Trading BV – Netherlands