PRE-INSULATED PIPE FOR DIRECT BURIAL, INDUSTRIAL APPLICATION

DN        – Nominal diameter

d          – Steel pipe outside diameter (mm)

D          – HDPE casing pipe outside diameter (mm)

F          – Wall thickness of HDPE casing pipe (mm)

P          – Weight of the pre-insulated pipe (kg/m)

V          – Volume of water (l/m)

L          – Standard length (m)

Other sizes – on request and upon discussion.

Raw materials

Carrier steel pipe is manufactured acc.:

- EN 10216-2 or another equivalent norm regarding seamless pipes, steel grade P235GH .

- EN 10220 – steel pipes sizes

Pipe ends are bevelled in order to facilitate welding acc. ISO 6761.

HDPE Casing pipe

Otside casing pipe is manufactured from high-density polyethilene with added antioxidants, UV stabilizers and carbon black.

Internal surface of PE pipes is processed with Corona treatment in order to achieve better adhesion with PUR foam.

Polyurethane system

AVKO jsc is using polyurethane system with foaming agent cyclopentane. The resulting PUR foam is characterized with very low heat conductivity coefficient  < 0,027 W/mK.

Thermo-insulation shell

The used thermo-insulation shell is mineral wool with the following characteristics:

Използваните топлоизолационни черупки са изработени от минерална вата със следните свойства:

Heat conductivity coefficient     – 0,034 W/mK

Work temperature                          – до 700°С

Density                                                – 120-150 kg/m³