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Monolithic isolating joint - Isojoints®
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"AAA" - Level Two Contributor
Radolid® Protection Caps
IsoJoint® is a true monolithic isolating joint. The most
up-to-date, patented joint on the market, IsoJoint® does
not depend on the use of insulating sleeves and washers for bolts nor
insulating gaskets or O-rings between flanges. Why? These insulating gasket
kits require a critical, even surface to provide regular and variable crushing
and must be maintained over the life of the insulator. External pressure,
causing an uneven load on the flange area, can result in loss of insulating
properties as well as the transported fluid.
IsoJoint® employs one or more, preassembled pressure seals and
the insulating rings. Unlike insulating gasket kits, IsoJoint®
does not depend on installer's actual fitting of the joint's insulating gasket,
sleeves and washers and the possible loss or damage to any one of the number
of these materials which would result in complete breakdown of the insulated
flange. One lost or damaged part will render these flanges useless. The
monobloc design of the IsoJoint® allows the joint to be welded
into place as one piece, virtually eliminating any field problems. Unless a
meticulous on-site assembly and over-wrapping is undertaken in the installation
of the insulating gasket kits, gradual penetration of moisture will erode the
electrical resistance. This problem, along with the others listed above, make
inspection and maintenance necessary. Contrary to this inconvenience,
IsoJoint®'s technique and design of the pressure seals, coupled
with the closure weld, guarantees that the specified mechanical and electrical
properties will always be maintained allowing for direct burial and requiring
At first glance, flange gasket kits seem to be the economical route to take to
the insulating problem, but when coupled with the expense of components, labour
and maintenance, IsoJoint® has proven itself to be the productive solution.
The IsoJoint® provides for current control by separating pipework into distinct
zones as part of a cathodic protection system and effectively eliminating
long-line currents. This assures increased plant and equipment life by
reducing or eliminating corrosion damage. Effective control can be realized
by placing IsoJoints® at pipeline entry points to processing plants or gas
compressor stations, where a branch is connected to the mainline, where two
pipelines of different material connect to where well coated pipe meets a
poorly coated system. Optimum cathodic protection can be achieved for each
section of pipeline—maximizing savings and minimizing costs.
IsoJoint®s are manufactured in accordance with the highest
technical standards which guarantee mechanical requirements (torque, traction,
bending, etc.) are met for the specific needs of a plant. Full Technical details
should be supplied.
Specific hydraulic internal pressures are maintained.
Insulating requirements are met and surpassed in regard to the
electrical characteristics of the product carried in the
IsoJoints® are designed according to ASME VIII,
All testing is done in-house. Hydrostatic and electrical are
standard. Ultrasonic, X-ray and dye penetrant testing can
be done if requested. Testing voltage 3,000 v-50 Hz. Electrical
resistance -5 Mohm minimum. Test Pressure: 1.5 time
working pressure. Working temperature
up to 160 degrees F. Customers may require special test values.
All coatings are applied in-house. Standard joints are coated
internally and externally with epoxy-resin coatings.
Different standards as per customer's
Monolithic Insulating joints, 12.5mm to 4 meter diameter, ANSI 150# to 2500#,
Gr. B to X70.
U.S. Patented • Manufactured to ISO9002.