Pre-insulated Steel Pipes for Heat Networks

LINKUN pre-insulated pipes meet all of the requirements of European standards EN 253, EN 448, EN 488 and EN 489.

Pipe operating parameters:

We can produce Pre-insulated/Thermal Insulation Steel Pipes:

Insulation Standard: EN 253

Standard: API 5L, ASTM A53/A106/A333, EN 10216-2 P235GH/P265GH

OD: 21.3 - 813mm

Length: 5.8m, 6m, 11.8m, 12m

The maximum operating temperature is 142°C (150°C on a short-term basis) for a maximum operating overpressure of 2.5 MPa with a service life of 30 years. Pipes with PUR foam insulation with an increased thermal resistance of up to 165°C can be supplied on request.

Pre-insulated piping systems manufactured from specific materials are often found in the chemical and cooling industries, in potable water distribution, sewerage systems etc.

Pre-insulated piping was developed for district heating, where it is routinely used. District heating is characterized by long transportation distances that range from tens of meters to tens of kilometers of pipelines.

These pipelines distributing hot water or steam can be used with remote sources of heat that are more powerful and more effective at high-temperature combustion than decentralized units, and are fitted with effective filters to reduce emissions. Pre-insulated pipes for district heating can also be used with renewable sources of heat or to transport surplus heat from power stations and industrial and agricultural production.

All pre-insulated piping systems for district heating contain a high-quality steel carrier pipe which allows the transportation of high-temperature and high-pressure heat media with a total service life of up to 30 years. In addition, heat loss can be significantly reduced by selecting thicker insulation.

The pre-insulated pipeline system is used for underground heat and cold distribution. 

The steel carrier pipe is insulated with hard polyurethane foam blown with cyclopentane. 

The casing pipe, manufactured from high-density polyethylene, protects the pre-insulated pipe from the effects of the outside environment.

Pre-insulated piping consists of the following main components:

1) Carrier pipe

The choice of materials for the carrier pipe depends largely on the type of medium transported, and the operating temperatures and pressures. For example, carrier pipes can be made of the following materials:

steel, stainless steel, acid-resistant steel, copper, polyethylene, polypropylene (PPR), polybutene (PB), fiberglass, PEX, cast iron, etc.

2) Casing pipe

The choice of a suitable material for the casing of pre-insulated pipes is largely dependent on the planned installation site, e.g.:

polyethylene for underground applications or even above-ground applications if special joints are used

zinc-coated steel, stainless steel or aluminum spiral-wound superimposed sheets for above-ground distribution

polyethylene-coated steel pipes for trenchless routing for demanding applications

etc.

3) PUR insulation

The polyurethane insulation used is intended for continuous operating temperatures from -196°C up to +142°C (150°C on a short-term basis). Alternatively, for higher operating temperatures, we are able to supply pipes with polyurethane foam insulation with an increased thermal resistance of up to 165°C. Fintherm only uses foam blown with cyclopentane (CFC-free). This modern technology for high-pressure foam injection ensures low heat loss with pre-insulated pipes.

Linkun is one of the leading China Pipeline Coatings manufacturers and suppliers, if you want to buy or import best high-quality pre-insulated steel pipes for heat networks professional company, factory, seller, and exporter, or if you are checking steel brands, please feel free to contact us.