AVKO

PRE-INSULATED PIPE SYSTEMS FOR DISTRICT HEATING NETWORKS


ABOUT US

For more than 25 years now AVKO has been following the most up-to-date tendencies regarding our clients needs as well as the development of new technologies. Following these priorities in 2000 the company branched into the production of pre-insulated pipes and fittings for transfer of hot water. The main application of these products is for construction of centralized urban district heating networks. In order to satisfy our clients high expectations, we implement the latest, most efficient materials that allow us to achieve very low thermal conductivity of our insulation and high reliability of the constructed heat transfer system.

Our production equipment, acquired from European manufacturers, follows all European norms and regulations concerning the production of pre-insulated pipes and fittings. AVKO has designed and constructed its own tube bending machine for thin walled steel pipes up to size DN 200. The implemented polyurethane system with foaming agent cyclopentane provides thermal conductivity coefficient of . This foam system is eco-friendly and conforms to the European Union environmental requirements. The welding process for steel fittings is certified according EN 288-1.

The main machines and equipment, used in the production pre-insulated elements are:

  1. Mixing, dosing and injecting installation for PUR foam based on foaming agent cyclopentane providing automated programmable separate heating and cooling of each component as well as automated programmable dosing of  all components of the PUR mixture for each size product.
  2. Mixing, dosing and injecting installation for PUR foam based on foaming agent CO2.
  3. Portable mixing, dosing and injecting installation for PUR foam.
  4. Fine PE-welding equipment for production of fittings.
  5. Tube-bending machinery.
  6. Steel pipe welding devices.
  7. Steel pipes cutting band-saw.
  8. PE-cutting band-saw with option for fine adjustment of the cutting angle.
  9. Heating chambers for pipes and fittings.
  10. Conveyers and lifting devices.

Finished production is stored acc. developed “Instruction for handling and storage of pre-insulated pipes and fittings” manufactured by AVKO jsc

AVKO jsc was among the first Bulgarian companies that have certified their quality control system acc. to ISO 9000. Quality control is an integrated technological operation. Process control during production is a main principle.

AVKO’s pre-insulated piping systems conform to the “Regulations of substantial requirements for building materials” based on European Safe Building Materials Regulations – Report No. 00-91/09.03.04.

In our research and production we apply main European Norms for pre-insulated piping systems:

- EN 253 – District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene

- EN 448 – District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene

- EN 488 – District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Steel valve assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene

- EN 489 – District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing

of polyethylene

AVKO jsc has the capacity and the means to be reliable partner for Bulgarian and European companies, which has been proven oven time. We offer our clients a set of favourable delivery conditions  and adaptable price policy including discounts, delayed payment, transportation, etc. Our specialists are always ready to help our clients during both pipeline design and installation of our products.

Having in mind our level of mastering the pre-insulated piping systems, we declare OUR READYNESS to create pipelines including their design, production and installation of all components. Quality control of these activities we will perform ourselves. This will assure us of the pipeline quality and will give us certainty that all requirements for long service life of our products are respected acc. EN 253:2003.