Loose Backing Flanges

Backing Flange / FBE Coated Steel / EN1092 / PN16

FBE coated steel loose backing flange dimensions are machined in accordance with BSEN 1092-1 to match an ISO 9624 Standard PE flange adaptor. The ring is drilled in accordance with BSEN 1092-1 PN16. Other drillings are available on request.

Steel flanges are manufactured from Grade 250 Mild steel, which is grit blasted to SA2.5 white metal, with a surface profile > 75um then heated and coated with a high-quality Fusion Bonded Epoxy (FBE).  

Coatings are applied and tested in accordance with the UK Water Industry Standard WIS 4-52-01 coatings suitable for buried applications.

Note: FBE is not recommended for prolonged direct UV exposure, due to the chalking effect occurring on the surface of epoxies when exposed to UV.  For such applications consider using a 316 Stainless Steel loose backing ring.

TBC - Dimension to be supplied by the purchaser depending on the design Maximum Operating Pressure (MOP).

Product Code

DN (Flange)

DN/OD (Pipe)

D

k (PCD)

d2

No. of Bolt Holes

t1

P09.420.063050

50

63

165

125

18

4

20

P09.420.075065

65

75

185

145

18

4

20

P09.420.090080

80

90

200

160

18

8

20

P09.420.110100

100

110

220

180

18

8

22

P09.420.125100

100

125

220

180

18

8

22

P09.420.140125

125

140

250

210

18

8

22

P09.420.160150

150

160

285

240

22

8

24

P09.420.180150

150

180

285

240

22

8

24

P09.420.200200

200

200

340

295

22

12

26

P09.420.225200

200

225

340

295

22

12

26

P09.420.250250

250

250

405

355

26

12

29

P09.420.280250

250

280

405

355

26

12

29

P09.420.315300

300

315

455

410

26

12

32

P09.420.355350

350

355

520

470

26

16

35

P09.420.400400

400

400

580

525

30

16

38

P09.420.450450

450

450

640

585

30

20

42

P09.420.500500

500

500

715

650

33

20

46

P09.420.560600

600

560

840

770

36

20

55

P09.420.630600

600

630

840

770

36

20

55

P09.420.710700

700

710

910

840

36

24

63

P09.420.800800

800

800

1025

950

39

24

74

P09.420.900900

900

900

1125

1050

39

28

82

P09.420.10001000

1000

1000

1255

1170

42

28

90

P09.420.12001200

1200

1200

1485

1390

48

32

TBC

P09.420.14001400

1400

1400

1685

1590

48

36

TBC

P09.420.16001600

1600

1600

1930

1820

56

40

TBC

P09.420.18001800

1800

1800

2130

2020

56

44

TBC

P09.420.20002000

2000

2000

2345

2230

62 48

TBC

Backing Flange / Stainless Steel / EN1092 / PN16

Stainless Steel loose backing flanges are machined in accordance with BSEN 1092-1 to dimensionally match an ISO 9624 PE flange adaptor.  The ring is drilled in accordance with BSEN 1092-1 PN16.  Other drillings are available on request.

Flanges can be manufactured from various grades of Stainless steel depending on the application and the required time to first maintenance, for a 100-year design life without maintenance, we recommend the following:

  • Exposed in a non-marine environment, inside a building such as mechanical services: Grade 304 Stainless steel such as BSEN 10088-2 Grade 1.4301 or 1.4307
  • Buried in the ground or exposed within coastal environments: Grade 316L Stainless steel such as BSEN 10088-2 Grade 1.4401 or 1.4404
  • Permenantly immersed in seawater, installed in splash zones, under marine structures or buried in the seabed (flanged joints on a submarine pipeline): Duplex Stainless Steel (improved resistance to crevice corrosion) such as BSEN 10088-2 Grade 1.4462 for plate rings or BSEN 10222-5 Grade 1.4462 for forged rings.

Further information on marine grade stainless steels selections can be found at International Stainless Steel Forum: 

Note: when connecting Stainless steel flanges or fasteners to a Ductile Iron fitting there is potential for galvanic or dissimilar metal corrosion between the stainless steel and Cast Iron.  Insulation of stainless steel fasteners in contact with cast iron such as using Acetyl or POM washers should be considered.

No Liability: The recommendations given above are generic, designers must consider the actual environmental considerations in each application and make an informed material choice.

TBC - Dimension to be supplied by the purchaser depending on the design Maximum Operating Pressure (MOP).

Product Code

DN (Flange)

DN/OD (Pipe)

D

k (PCD)

d2

No. of Bolt Holes

t1

P09.420.063050

50

63

165

125

18

4

20

P09.420.075065

65

75

185

145

18

4

20

P09.420.090080

80

90

200

160

18

8

20

P09.420.110100

100

110

220

180

18

8

22

P09.420.125100

100

125

220

180

18

8

22

P09.420.140125

125

140

250

210

18

8

22

P09.420.160150

150

160

285

240

22

8

24

P09.420.180150

150

180

285

240

22

8

24

P09.420.200200

200

200

340

295

22

12

26

P09.420.225200

200

225

340

295

22

12

26

P09.420.250250

250

250

405

355

26

12

29

P09.420.280250

250

280

405

355

26

12

29

P09.420.315300

300

315

455

410

26

12

32

P09.420.355350

350

355

520

470

26

16

35

P09.420.400400

400

400

580

525

30

16

38

P09.420.450450

450

450

640

585

30

20

42

P09.420.500500

500

500

715

650

33

20

46

P09.420.560600

600

560

840

770

36

20

55

P09.420.630600

600

630

840

770

36

20

55

P09.420.710700

700

710

910

840

36

24

63

P09.420.800800

800

800

1025

950

39

24

74

P09.420.900900

900

900

1125

1050

39

28

82

P09.420.10001000

1000

1000

1255

1170

42

28

90

P09.420.12001200

1200

1200

1485

1390

48

32

TBC

P09.420.14001400

1400

1400

1685

1590

48

36

TBC

P09.420.16001600

1600

1600

1930

1820

56

40

TBC

P09.420.18001800

1800

1800

2130

2020

56

44

TBC

P09.420.20002000

2000

2000

2345

2230

62

48

TBC