Chemical Engineering April 2013 - 30

Trelleborg Group
FOCUS ON
Freudenberg Process Seals
Seals &
Gaskets
Avoid pipe corrosion
with this spacer
Flexspacer
and
thermal
Flexspacer (photo) has
been developed to effectively
create an air gap
between topside pipelines
and thermal insulation,
thereby avoiding the corrosion that
can occur when using traditional insu(photo)
has
been developed to effectively
create an air gap
between topside pipelines
insulation,
thereby avoiding the corrosion that
can occur when using traditional insulation
systems such as mineral wool.
By stopping direct contact between
the insulation and the pipe, Flexspacer
prevents any damage to the corrosion
protection on the pipe, thus helping to
guarantee thermal performance. Flexspacer
is a new rubber-based solution
that provides a 1-2-cm air gap between
the pipe and insulation. It can
be easily installed without using hot
works or special tools, and can be connected
and split to the desired length
using just a pair of scissors, says the
company. It has been qualified for use
up to 150°C continuous service temperature,
for more than 30 years. -
Trelleborg Group, Stavanger, Norway
www.trelleborg.com/offshore
This packing system removes
particles from stuffi ng boxes
The SuperSet (photo) combines sealing
capabilities of this company's mechanical
packing products with the
patented design of the EnviroSeal
SpiralTrac Version P Environmental
Controller for packed stuffing boxes.
This total sealing set is designed and
proven to increase packing and equipment
service life while dramatically
reducing flush rates, says the company.
The savings are real - increased reliability
with lower maintenance and
operating costs. SpiralTrac enhances
the utilization of the flow and centrifugal
effects around the shaft, and performs
like a centrifugal separator. The
built-in lantern ring and helical grooving
system impart motion to the flush,
and the resulting centrifugal force
throws particles in the fluid outside of
the bushing. The patented SpiralTrac
grooving system then hydrodynamically
pumps the solids to the bottom of
W.A. Chesterton
such as IP65, IP66 and
IP67, and silicone rubber
provides consistent deflection
properties in cold and
hot climates while resisting
the damaging effects of ultraviolet
and sunlight. The
10 and 20 durometer LSR
compounds are Wacker
Silicones LR3003/10TR
and LR3003/20TR respectively.
This company injection
molds 1212-in. LSR
sheets in 10 and 20 durometer,
with standard thicknesses
from 0.032 to 0.125
in. - Stockwell Elastomerics,
Inc. Philadelphia, Pa.
www.stockwell.com
the stuffing box and back out into the
pump casing. - W.A. Chesterton Co.,
Wobum, Mass.
www.chesterton.com
Very soft gaskets prevent water
ingress into enclosures
This company recently introduced
molded liquid silicone rubber (LSR)
gaskets with 10 and 20 durometer
Shore A. The gaskets provide improved
water sealing and protection for enclosures
and portable devices. Low
durometer LSR gaskets are said to
have improved sealing properties over
silicone foam or closed-cell silicone
sponge gaskets. Enclosures and portable
devices are frequently required
to pass water ingress requirements,
30 CHEMICAL ENGINEERING WWW.CHE.COM APRIL 2013
This elastomer meets
the demands of deionized water
The elastomer compound 70 EPDM
291 (photo) offers very good properties
when in contact with both water
and deionized water. The material exhibits
no significant increase in mass
or volume when submerged in water
at 200°C over long periods of time,
nor after prolonged immersion in deionized
water at 100°C. O-rings and
O-ring-type seals in special shapes
or seals for valves and fittings made
from 70 EPDM 291 remain reliably
resistant in water up to 180°C, deionized
water up to 160°C and in air up to
150°C. The material meets the specifications
of the European standard DIN
EN 681 - 1 WB and the U.S. standard
Note : For more information, circle the 3-digit number
on p. 68, or use the website designation.
http://www.trelleborg.com/offshore http://www.stockwell.com http://www.chesterton.com http://WWW.CHE.COM
Chemical Engineering April 2013

Table of Contents for the Digital Edition of Chemical Engineering April 2013
