Thermalok Pipe Spool Dimensions
Resistoflex Thermalok steel pipe and PTFE liner act as
one integral piece. Combining dissimilar materials with very different
coefficients of thermal expansion, our precision Thermalok Process
locks the isostatically molded PTFE liner into the pipe housing, making
it full vacuum rated from -20°F to 450°F. We developed and
patented the Thermalok process for lining steel pipe in the 1950's,
and have been the world leader in the manufacture of plastic-lined
piping products ever since.
The Thermalok process positively locks the plastic liner in the metal
pipe housing while effectively relieving stresses that could cause
unwanted liner movement in service.
This unique Thermalok process provides lined pipe with dimensional
stability under vacuum, pressure, and thermal cycling conditions,
which prevents liner buckling and cracked flares within operational
Thermalok Field Flare Pipe
Resistoflex supplies Thermalok Field Flare pipe with moveable liner
for our distributors and end users who fabricate finished pipe spools
in their shops. Moveable liner allows the fabricator a wide variety
of flange options - rotating, welded, or threaded. Thermalok Field
Flare tooling is available - please see our
Tooling and Fabrication section for more information. Available liners
are PTFE, PVDF, and polypropylene.
The Thermalok Field Flare product is made with the same process as
our standard flanged Thermalok pipe spools, but the relaxing step
is modified to result in a moveable liner. When fabricated by a
distributor or end user with Resistoflex tooling and in accordance
with our procedures, the finished piping has identical performance
(pressure/temperature/vacuum) as our standard factory-made pipe spools.
All field flare piping has been qualified to the rigorous testing
requirements of ASTM F1545.
Drawing and Sizing
- Incoming lots of resin are analyzed in our Quality Assurance laboratory for
conformance to established raw material specifications.
- The liner is processed under controlled conditions to a size
somewhat larger than the I.D. of the steel housing into which it will
be installed. It is then thoroughly inspected for conformance to
design specifications. Next, the PTFE liner is subjected to a battery
of quality tests designed to ensure liner integrity.
- The liner is then drawn through a sizing die at carefully controlled
draw rates which results in a calculated reduction in the outside
- A programmed heating cycle relaxes the liner inside the steel housing,
resulting in a snug liner fit. Design allowances are incorporated in this
procedure to eliminate undesirable stresses in the finished product.
- Both liner ends of the pipe spool are then hot flared. Temperature, time
and pressure are carefully monitored.
- The finished pipe is then tested in accordance with ASTM F1545
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