Intermittent Steam Purge Bundles | Parker IS for Freeze Protection


Intermittent Steam Purge Bundles


Parflex IS-Intermittent Steam purge bundles are thermally insulated with a composite layer of fiberglass that allows for occasional high-temperature steam purge up to 1100°F (593°C) while at the same time ensuring freeze protection during winter using self-regulating heating cables.


Parker IS Tubing Parker IS Bundle

Performance Data


Parflex IS-Intermittent Steam purge bundles are properly insulated to ensure that the outer surface area of the bundle is at or below 140°F (60°C), meeting NEC Personnel Protection Code 427.12, during steam purge conditions at the highest specified ambient temperature.

IS- Intermittent Steam purge bundles are designed to provide a freeze protection temperature of 40°F (4.4°C) at the lowest specified ambient temperature.

Heating Cables

Cables are available in 120V and 208-277 volt, with Heat outputs of 5, 10, 15 and 20 watt/ft.

Parflex standard IS designs come with an internal tinned copper braid on the heating cable for grounding purpose and a Fluoropolymer jacket over the heater to provide additional protection against
harsh environments.

Common Tube Materials and Sizes

Parflex IS-Intermittent Steam product are readily available in single and double tube. The most common tube sizes requested being 3/8” and 1⁄2” Seamless Stainless Steel 316/316L/316H alloys in either an average wall specification ASTM A269 or minimum wall specification ASTM A213. Other alloys and standards are available. We also have available many other sizes; including metric sizes 6 mm, 8mm, 10mm and 12mm. Please contact us.


All IS-Intermittent Steam products are pressure tested prior to shipment. Third party testing and witnessing is available upon request. Please contact us.

Jacketing Materials

Black UV resistant FR-PVC is our standard material. However, other jacketing materials, including non-halogenated FR-TPE and Urethanes, are available upon request. Color jackets are also available upon request. Please contact us.

Intermittent Design*: Bundles can be steam purged for a period of 5 minutes once a day. During steam purge the outer jacket surface temperature will not exceed 140°F (60°C).

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