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Application

Municipal water and heating

Joint sealing and corrosion protection for water and district heating networks

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Stakes of failure

Municipal water and district heating networks need joint sealing and corrosion protection that survives decades underground. Covalence heat‑shrink sleeves, BG Industry PE sleeve fittings, and Stopaq systems cover both new builds and rehabilitation. Warehouse in Tuusula; installation guidance by phone on request.

Product families that solve this
Seal for Life
Covalence
Heat-shrink technology for district heating joints

Choose this when the joint is on pre‑insulated pipe and the sizes vary: the sleeve is wrapped on site and covers casings from 90 to 1200 mm, including repairs and dimensions outside a standard series.

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BG Industry
BG Industry
Heat-shrink joints for pre‑insulated pipes

Choose this when the pipe size falls in the DN 90–450 standard series and many similar joints are made: the prefabricated sleeve is fast and repeatable, no welding is needed, and the joint is leak‑testable.

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Seal for Life
Stopaq
Polyisobutene-based self‑healing corrosion protection

Choose this when the surface is bare steel or an irregular shape: bends, valves, flanges, tanks, and corrosion under insulation. ST2 cleaning is enough, no blasting is needed, and it works as prevention as much as repair.

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Frequently asked questions

Questions and answers

Which system protects a district heating joint?
The joints of pre‑insulated district heating pipes are sealed with Covalence heat‑shrink sleeves or BG Industry heat‑shrink joints. The Covalence sleeves are tested to EN‑489:2009 by the FFI, the BG Industry sleeves to the newer EN‑489‑1:2019 at Veolia Energy Warsaw. The choice depends on pipe size and contract requirements.
Why is sealing the joint critical?
The insulation of a district heating pipe stays dry only if the joint keeps water out. A leaking joint wets the insulation, weakens the thermal insulation and starts corrosion of the steel pipe under the casing. The repair means opening the street and interrupting heat distribution.
Which pipe sizes do the products fit?
Covalence RJS-E covers casings from 90 to 1200 mm and BG Industry heat‑shrink joints cover DN 90 to DN 450. Together they cover the typical size range of a district heating network.
Can the joint be made without welding?
Yes. The BG Industry heat‑shrink joint is a non-welded, butyl-sealed, leak-testable joint. Covalence heat‑shrink sleeves are installed by heating, not welding.
How long does the protection last?
The systems are designed to last in the ground for the service life of the pipe, where a traditional coating is recoated about every ten years. This reduces excavation and maintenance shutdowns over the network's lifecycle.

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