Assets such as offshore pipelines, risers, spools and subsea structures
which transport liquid products may be required to maintain a minimum
temperature while the product is being transported within the asset,
particularly offshore. Some liquids such as oil and gas can leave wax or
hydrate deposits if a minimum temperature is not maintained. These
deposits can, over time, build up and block the asset/pipeline either
reducing or completely stopping flow/production. External wet insulation
can be designed and applied to ensure the reduction in product
temperature is kept within a range so the risk of deposits during
production is acceptable. Insulation can also reduce the frequency of
pigging operations during the life of the asset.
During other operational events, such as pipeline shutdowns, the
product is contained in a stationary state within the asset/pipeline
while the process facility has other operations performed. Similarly, to
avoid deposits during these shutdown periods external insulation can be
designed and applied to ensure the reduction in product temperature is
kept within a range so the risk of deposits during shutdowns is
acceptable.
Injected Molded Polyurethane Applications provide thermal insulation
and are commonly used offshore on flowline and riser field joints,
spools and subsea structures. It is used less often onshore to thermally
insulate pipelines and spools. The asset will require to have been
pre-coated with an anti-corrosion layer prior to the thermal insulation
application.
The preparation for IMPU requires that the anti-corrosion layer is in
good condition and the bevel faces of the parent coating (usually PP)
are cleaned, abraded and then pre-heated to build bond strength between
the PP and IMPU. Once this preparation is completed a mold is placed
over the area to be treated and Solid Polyurethane is injected into the
annulus and often overlapping the parent coating bevel faces and onto
the OD surface of the PP. Once the material cures the mold is removed
and inspected.
OJS can apply all Solid Polyurethanes available on the market however
we recommend our own formulated solid polyurethane material called Densiflex for IMPU coatings. Densiflex is mercury free and fast curing – which is suitable for the offshore market.
Injected Molded Polypropylene Applications provide thermal insulation
on pipeline and riser field joints and spools. The asset will require to
have been pre-coated with an anti-corrosion layer prior to this thermal
insulation application.
The preparation for IMPP requires that the anti-corrosion layer is in
good condition and the bevel faces of the parent coating (usually PP)
are cleaned, abraded and then pre-heated to build bond strength between
the PP and IMPP. Once this preparation is completed a mold is placed
over the area to be treated and Solid Polypropylene is injected into the
annulus. Once the material cures the mold is removed and inspected.
Sumber :http://www.f-e-t.com/our_products_technologies/subsea-solutions/pipeline-field-joint-coatings/thermal-insulation-for-pipelines-risers-spools-and-subsea-structures/
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