Compensator KAN-therm Push

KAN-therm Push expansion compensator

A KAN-therm Push expansion compensator is used where a PE-Xc or PE-RT pipe changes length as it heats and cools. In the Push system this is not a bellows unit. It is a geometric layout: an L-, Z- or U-shaped run of pipe and fittings that absorbs thermal elongation through a flexible compensation arm. It is planned on internal heating, domestic hot water and risers when the route is exposed or rigidly fixed. Without an arm calculation and correctly placed supports, joints take unnecessary stress.

Main types

An L-type compensator uses a natural change of direction. Elongation of the straight run becomes a slight bend in the arm, so no extra loop is needed if the arm is long enough for the pipe diameter and calculated elongation.

A Z-type compensator is used when the pipe axis can be shifted in parallel. The equivalent length is the sum of both runs; elongation and arm length are then calculated. No clips are fixed on that arm.

A U-type compensator is chosen when the pipe stays on one axis and the route cannot change direction. In Push it is built from 90° elbows and pipe lengths. The arm is left free, and its length must not exceed the allowed support spacing for that diameter.

PE-Xc and PE-RT pipes of low stiffness are often laid in free curves in concealed routes — self-compensation. On a riser, fixed points can sit at each branch, but long exposed runs still need an elongation check.

Materials and construction

The arm is made from the same pipe as the main run: five-layer PE-Xc or PE-RT with an EVOH oxygen barrier. The barrier limits oxygen ingress into the heating circuit, while the polyethylene stays flexible enough to bend. Joints use Push fittings in PPSU or brass and a sliding ring, brass or polymer. The ring is pushed over the expanded pipe end, so the node is assembled by the same method as the rest of the system, without welding. Project data for Push pipes use a material constant of 15. Temperature and pressure limits are taken from the data sheet of the specific pipe.

Where it is used

The layout is used on floor distribution and risers for heating and hot water, in shafts and on exposed wall runs. A short concealed section often relies on self-compensation. A long straight run, a collector connection or a riser with fixed points needs a calculated arm. Bellows expansion joints for steel networks are outside this group.

How to select a KAN-therm Push expansion compensator

Record the straight length between fixed points, the temperature difference between installation and operation, and the outside diameter. Elongation is calculated from the linear expansion coefficient, then the arm length is taken from the KAN-therm formula or table. For a Z layout both segments are included. The diameter must match the pipe on that run: Push commonly uses outside diameters of 12–32 mm. Sliding supports must allow axial movement; fixed points define the reference. If there is no room for an L or Z layout, a U-loop is planned. Kit cost depends on diameter, number of elbows, fitting type and pipe length.

Why order from Pipeline Systems of Ukraine

On pipelinesystems.com.ua you can select Push pipes, elbows and fittings to build the compensation arm with the rest of the route. Specialists help check diameter, pipe type and support layout before purchase. Retail and wholesale, project kitting and delivery across Ukraine are available. Availability and price of a specific item are confirmed before dispatch.

Popular sizes

Arm selection in Push follows the outside diameter of the pipe on that run, not the nominal size of a bellows. KAN-therm tables for PE-Xc and PE-RT most often list:

• 12×2.0 mm
• 14×2.0 mm
• 16 mm
• 18×2.0 / 18×2.5 mm
• 20 mm
• 25×3.5 mm
• 32×4.4 mm

Arm length for each diameter is set by the elongation of the run. Pipe, elbow and ring availability is confirmed before ordering.

Send a request to confirm availability and price of pipes and fittings for a KAN-therm Push expansion compensator. We will advise which arm layout fits your route.

FAQ

How is a KAN-therm Push compensator different from a bellows?
It is not a metal insert. It is a PE-Xc or PE-RT section with Push fittings. Elongation is taken by a flexible arm at a bend, an axis shift or a U-loop. A steel-line bellows does not replace the arm calculation.

When to use L, Z or U?
Use L on a natural change of direction. Use Z if the axis can shift in parallel. Build a U from 90° elbows when the pipe stays straight and the route cannot turn.

Is self-compensation enough?
On a short concealed run, Push pipe is often laid in free curves, and fixed points on a riser sit at the branches. A long exposed straight, a shaft or a collector connection still needs a calculated arm.

What should be checked before installing the arm?
Length between fixed points, temperature difference, outside diameter and space for the arm. Do not clip the arm. Sliding supports must allow axial travel, and the Push ring is slid only onto a correctly expanded pipe end.

What drives the kit price?
Diameter, number of elbows, fitting material (PPSU or brass), sliding-ring type and metres of pipe in the arm. This group usually has no ready-made compensator size, so the kit is built to the route layout.