FOR DIRECT BURIAL
Pre-insulated piping system for INDUSTRIAL PURPOSES

PRE-INSULATED ELBOW 90°, 45° FOR DIRECT BURIAL, INDUSTRIAL APPLICATION

DN	d	D Range 150-180^оС	D Range 180-210^оС	D Range 210-240^оС	L
	mm	mm	mm	mm	mm
25	33,7	140	140	-	1000
32	42,4	160	160	-	1000
40	48,3	160	160	200	1000
50	60,3	180	180	200	1000
65	76,1	200	200	225	1000
80	88,9	200	225	250	1000
100	114,3	250	250	280	1000
125	139,7	250	280	315	1000
150	168,3	280	315	355	1000
200	219,1	355	355	400	1000
250	273,0	400	400	500	1000
300	323,9	450	450	560	1000

DN – Nominal diameter

d – Steel pipe outside diameter (mm)

D – HDPE casing pipe outside diameter (mm)

L – Length of the arms of the elbow (mm)

Bending radius: R=1,5 d

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

PRE-INSULATED PIPE SYSTEMS FOR DISTRICT HEATING NETWORKS

Raw materials