AVKO

PRE-INSULATED PIPE SYSTEMS FOR DISTRICT HEATING NETWORKS


Pre-insulated piping system for CENTRALIZED DISTRICT HEATING
FOR ABOVE GROUND INSTALLATION

PRE-INSULATED ELBOW 90°, 45° FOR ABOVE GROUND INSTALLATION

PRE-INSULATED ELBOW 90° PRE-INSULATED ELBOW 90°

PRE-INSULATED ELBOW 45°

DN

d

D

L 90o

L 45o

mm

mm

mm

mm

mm

20

26,9

100

250

200

25

33,7

100

250

200

32

42,4

100

280

200

40

48,3

100

280

200

50

60,3

125

330

250

65

76,1

140

430

250

80

88,9

160

470

300

100

114,3

200

530

300

125

139,7

225

590

300

150

168,3

250

650

350

200

219,1

315

570

350

250

273,0

400

640

450

300

323,9

450

720

450

DN - Nominal diameter

d - Steel pipe outside diameter (mm)

D - Outside diameter of casing pipe (mm)

L  – Length of the elbow arms (mm)

 

Bending radius:

- Welded elbows                  R = 1,5 d

- Cold bent elbows             R = 2,5 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 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.

 

 

Casing pipe

The casing pipe is manufactured from spirally wound galvanized steel sheet with thickness 0.6 mm. The zinc coating is with thickness 140 μm. The finished product conforms to  EN 1506.

 

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.