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Heat-shrink technology for district heating joints

Covalence makes the heat‑shrink sleeve systems that seal the field joints of pre‑insulated district heating and cooling pipes. A cross‑linked PE‑X backing and a dual‑adhesive system keep moisture out of the joint casing. The products are tested and certified to EN‑489:2009 (FFI).

EN‑489:2009RJS-EWPCP‑IVFOPSDHECSpecialty products

Type testing and certificates →

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Products

Covalence, products

RJS-E

RJS-E

Wrap‑around heat‑shrink sleeve for sealing the joint casings of pre‑insulated district heating pipes.

Ask about availability
WPCP‑IV

WPCP‑IV

Closure patch for Covalence wrap‑around heat‑shrink sleeves.

32 order codes
FOPS

FOPS

Heat‑applied closure patch that seals the foam‑injection hole in a pre‑insulated pipe casing after PUR foaming, keeping water out of the insulation.

Ask about availability
DHEC

DHEC

End cap for the terminations of a pre‑insulated pipeline: a shrink component that closes the casing end and keeps water out of the insulation where the line ends or breaks.

23 order codes
Specialty products

Specialty products

Alongside the standard range runs a set of specialty products that are asked for less often but have their own place.

106 order codes
Dual adhesive

The edges anchor, the centre seals.

RJS-E uses two adhesives for two jobs. A high-shear hot-melt at the edges anchors the sleeve in place against ground movement. A visco-elastic mastic in the centre forms the actual moisture seal and fills surface irregularities.

RJS-E heat-shrink sleeve, longitudinal section through a field jointSection through a field joint. A steel carrier pipe at the bottom, PUR insulation and a PE casing above it. The heat-shrink sleeve is wrapped over the joint, with a cross-linked polyethylene backing. Two different adhesives sit on its underside: a hot-melt along both edges and a visco-elastic mastic down the centre.Joint12345KMP-0001
  1. 1Cross‑linked PE backing
  2. 2Hot‑melt adhesive, along both edges
  3. 3Visco‑elastic mastic, centre
  4. 4PE casing
  5. 5PUR insulation and steel pipe
KMP-0001. Longitudinal section through a joint: hot-melt at the edges, a visco-elastic mastic in the centre.
Dimensions and codes

Size and order code in one table

These come from Kampek's own product catalogue. Take the code from the row and request a quote with it, so nobody has to retype it. Availability is confirmed with the quote.

WPCP‑IV closure patch

The two widths do not cover the same lengths. A dash means that combination is not in the catalogue.

WPCP‑IV: length and width, with the code for each combination
Length (mm)Width 100 mmWidth 150 mm
153WPCP-IV-100X153(S50)–
170WPCP-IV-100X170(S50)WPCP-IV-150X170(S50)
190WPCP-IV-100X190(S50)WPCP-IV-150X190(S50)
218WPCP-IV-100X218(S50)WPCP-IV-150X218(S50)
255WPCP-IV-100X255(S50)WPCP-IV-150X255(S50)
283WPCP-IV-100X283(S50)WPCP-IV-150X283(S50)
298WPCP-IV-100X298(S50)–
320WPCP-IV-100X320(S50)WPCP-IV-150X320(S50)
430–WPCP-IV-150X430(S50)
438WPCP-IV-100X438(S50)WPCP-IV-150X438(S50)
638WPCP-IV-100X638(S50)WPCP-IV-150X638(S50)
768WPCP-IV-100X768(S50)WPCP-IV-150X768(S50)
898WPCP-IV-100X898(S50)WPCP-IV-150X898(S50)

DHEC end cap

The size number is the catalogue's own series number, not a millimetre dimension. The source does not say what it measures.

DHEC end caps: size and code
SizeCode
2000DHEC-2000(C30)
2060DHEC-2060(C30)
2100DHEC-2100(C30)
2200DHEC-2200(C30)
2300DHEC-2300(C30)
2340DHEC-2340(C30)
2400DHEC-2400(C35)
2500DHEC-2500(C30)
2600DHEC-2600(C20)
2630DHEC-2630(C30)
2700DHEC-2700(C30))
2800DHEC-2800(C20)
2900DHEC-2900(C20)
3000DHEC-3000(C15)
3200DHEC-3200(C20)
3250DHEC-3250(C20)
3250-P604DHEC-3250-P604(C20)
3280DHEC-3280(C20)
3300DHEC-3300(C20)
3350-01DHEC-3350-01(C20)
3350-02DHEC-3350-02(C20)
3350-03DHEC-3350-03(C18)
3360-01DHEC-3360-01(C22)
Drawings

The closure and the termination

WPCP‑IV closure patch, transverse section at the sleeve overlapSection taken around the pipe. The casing sits in the centre with the wrap‑around heat‑shrink sleeve around it. The ends of the sleeve overlap at the top and form a longitudinal seam. The WPCP‑IV closure patch is applied over that seam, and uses the same cross‑linked HDPE backing and the same adhesive construction as the sleeve itself.Width 100 or 150 mm12345KMP-0002
  1. 1PE casing
  2. 2Wrap‑around heat‑shrink sleeve: backing and adhesive
  3. 3Longitudinal overlap of the sleeve
  4. 4WPCP‑IV closure patch over the seam
  5. 5Same cross‑linked HDPE backing and adhesive as the sleeve
KMP-0002. A wrap-around sleeve leaves a longitudinal overlap. The WPCP‑IV closure patch seals it, built the same way as the sleeve itself.
DHEC end cap, longitudinal section through the termination of a pre-insulated lineSection through a line termination. On the left the pre‑insulated pipe: steel carrier pipe, PUR insulation and PE casing. On the right the carrier pipe continues uninsulated. The casing and the insulation stop, which would leave the insulation space open. The DHEC end cap is shrunk down from the casing onto the carrier pipe and closes that space, so water cannot reach the insulation.Pre‑insulated pipeUninsulated pipe12345KMP-0005
  1. 1PE casing
  2. 2PUR insulation
  3. 3DHEC end cap, casing down to carrier pipe
  4. 4The cap seals down onto the carrier pipe
  5. 5Carrier pipe continues uninsulated
KMP-0005. At a line termination the casing and insulation stop. The DHEC end cap closes the insulation space against the carrier pipe.

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Applications

Where this is used

  • District heating joint sealing and corrosion protection
  • District cooling networks
  • Water pipeline networks
  • Oil and gas pipeline joints
When a joint leaks, the street gets dug up. In a gas line the consequences are an entirely different scale.
Cost of failure
Frequently asked questions

Covalence, common questions

What are Covalence heat‑shrink sleeves used for?
Covalence heat‑shrink sleeves seal the joint casings of pre‑insulated district heating and cooling pipes. They keep moisture out of the joint and protect the insulation. They also suit water network and oil and gas pipeline joints.
Which standard is Covalence tested to?
RJS-E and FOPS are tested to EN‑489:2009 by the FFI. EN 489 defines the requirements for joints in pre‑insulated district heating pipes, so the products can be specified directly for district heating contracts.
Which casing diameters does RJS-E cover?
RJS-E covers casing diameters from 90 to 1200 mm. The sleeve is available in widths from 230 to 900 mm. We help select the correct size with the quote.
What is the Permanent Change Indicator?
It is a dimpled pattern on the sleeve backing that disappears once the correct shrink temperature is reached. It lets a finished joint be inspected visually afterwards, without a separate measurement.
What operating temperature does Covalence withstand?
The operating temperature of RJS-E is up to 50 °C, and 60 °C under an expansion cushion. The values come from the manufacturer datasheet and match district heating joint conditions.
Where do I get Covalence product data and installation instructions?
Current datasheets and installation instructions are on the Seal for Life pages, which we link to directly. Kampek helps with product selection and installation questions by phone.

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