FOR DIRECT BURIAL
Pre-insulated piping system for CENTRALIZED DISTRICT HEATING

PRE-INSULATED T-PIECE PARALLEL

DN1, DN2 - Nominal diameter (mm)

d1, d2 - Steel pipe outside diameter (mm)

D1, D2 - Casing PE pipe outside diameter (mm)

L1, L2 – Length (mm)

Other sizes – on request.

			DN1	20	25	32	40	50	65	80	100	125	150	200	250	300	350	400
			d1	26,9	33,7	42,4	48,3	60,3	76,1	88,9	114,3	139,7	168,3	219,1	273,0	323,9	355,6	406,4
			D1	90	90	110	110	125	140	160	200	225	250	315	400	450	500	560
			L1	1000	1000	1000	1000	1000	1000	1500	1500	1500	1500	1500	2000	2000	2000	2000
DN2	d2	D2	L2
20	26,9	90	1000	x	x	x	x	x
25	33,7	90	1000		x	x	x	x	x	x	x
32	42,4	110	1000			x	x	x	x	x	x
40	48,3	110	1000				x	x	x	x	x
50	60,3	125	1000					x	x	x	x	x	x
65	76,1	140	1000						x	x	x	x	x
80	88,5	160	1000							x	x	x	x	x
100	114,3	200	1000								x	x	x	x	x
125	139,7	225	1000									x	x	x	x	x
150	168,3	250	1200										x	x	x	x	x
200	219,1	315	1200											x	x	x	x	x
250	273,0	400	1500												x	x	x	x
300	323,9	450	1500													x	x	x
350	355,6	500	1500														x	x
400	406,4	560	1500															x

Raw materials

Carrier steel pipe is manufactured acc.:

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

- EN 10217-1 another equivalent norm regarding longitudinally welded pipes, steel grade P235TR1/TR2

- EN 10217-2 another equivalent norm regarding longitudinally welded pipes, steel grade P235GH

- EN 10217-5 another equivalent norm regarding spirally welded pipes, steel grade P235GH

- EN 10220 – steel pipes sizes

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

During production, the quality of the welding seam is monitored constantly visually and through non-destructive testing. Finished pipes are subjected to hydro-static testing at 80 bar per 5 sec.

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.

PRE-INSULATED PIPE SYSTEMS FOR DISTRICT HEATING NETWORKS

Raw materials