Email： [email protected]

WhatsApp: +86 15093100892

Company Profile Factory Tour Quality Control Service

products

For over 30 years, PUHUI has been dedicating time and effort in developing production of high quality HDPE and PVC pipes and fittings.

HDPE Pipe And Fittings > Municipal Pipe System > Dredge Pipe System > Mining Pipe System > HDPE Butt Fusion Fittings > HDPE Electrofusion Fittings > HDPE Fabricated Fittings > HDPE Customized Fittings > HDPE Hollow Bar > HDPE Pipe Welding Machine > PVC Pipe > PVC Fittings > PP Compression Fittings > Flange >

Blog

Home > Products > Flange > Ductile Iron Backing Ring

Ductile Iron Backing Ring

Ductile Iron Backing Ring

1. Raw Materials: Ductile Iron to ASTM A536 Gr64/45/12
2. Diameter : 1 inch – 24 inch
3. Surface finish : Painted, Fusion bounded epoxy resin
4. Standards: ANSI B16.5 Class 150

Email: [email protected]

Send Email By WhatsApp Inquiry Now

Specification Of Backing Ring

Specification Of Backing Ring

Puhui can provide Stainless or Galvanised Metal Backing Rings Flange, Ductile Iron Backing Ring, PP Flange and PP Coated Steel Flange.

Main Uses

Stabilizes flange connections in non-self-supporting pipe installations.
Ensures even bolt tension to maintain joint integrity.
Serves as a solid support for plastic pipe flange adaptors.

Applications

Used in water and wastewater infrastructure.
Applied in industrial and marine piping systems.
Integral to gas and oil pipeline safety.

Advantages

Exceptional strength for high-stress environments.
Flexibility to prevent cracking under pressure.
Corrosion resistance for longevity.
Versatile fit for various pipe sizes and materials.

Size	Pressure	SDR	Type	OD	ID	T	Bolt No.	Bolt Hole Dia	Bolt Hole Circle
								B.D.	B.C.
1″	267 PSI	7	C	4.25	1.38	0.56	4	0.63	3.12
1 1/4″	267 PSI	7	C	4.62	1.72	0.63	4	0.63	3.5
1 1/2″	267 PSI	7	C	5	1.97	0.69	4	0.63	3.88
2″	267 PSI	7	C	6	2.46	0.75	4	0.75	4.75
2 1/2″	267 PSI	7	C	7	2.97	0.88	4	0.75	5.5
3″	267 PSI	7	C	7.5	3.6	0.94	4	0.75	6
4″	267 PSI	7	C	9	4.6	0.94	8	0.75	7.5
5″	267 PSI	7	C	10	5.69	0.94	8	0.88	8.5
6″	267 PSI	7	C	11	6.75	1	8	0.88	9.5
8″	267 PSI	7	C	13.5	8.75	1.12	8	0.88	11.75
10″	267 PSI	7	C	16	10.92	1.19	12	1	14.25
12″	267 PSI	7	C	19	12.92	1.5	12	1	17

Size	Pressure	SDR	Type	OD	ID	T	Bolt No.	Bolt Hole Dia	Bolt Hole Circle
								B.D.	B.C.
2″	160PSI	11	B	6	2.64	0.51	4	0.75	4.75
3″	160PSI	11	B	7.5	3.75	0.53	4	0.75	6
4″	160PSI	11	B	9	4.8	0.55	8	0.75	7.5
6″	160PSI	11	B	11	6.9	0.63	8	0.88	9.5
8″	160PSI	11	B	13.5	8.9	0.87	8	0.88	11.75
10″	160PSI	11	B	16	11	0.98	12	1	14.25
12″	160PSI	11	B	19	13.15	1.26	12	1.13	18.75
14″	160PSI	11	B	21	14.4	1.38	12	1.13	21.25
16″	160PSI	11	B	23.5	16.4	1.65	16	1.13	21.25
18″	160PSI	11	B	25	18.4	1.69	16	1.25	22.75
20″	160PSI	11	B	27.5	20.5	1.81	20	1.25	25
22″	160PSI	11	B	29.5	22.5	2.01	20	1.38	27.25
24″	160PSI	11	B	32	24.5	2.17	20	1.38	29.5

Size	Pressure	SDR	Type	OD	ID	T	Bolt No.	Bolt Hole Dia	Bolt Hole Circle
								B.D.	B.C.
2″	267 PSI	7	B	6	2.63	0.75	4	0.75	4.75
3″	267 PSI	7	B	7.5	3.75	0.94	4	0.75	6
4″	267 PSI	7	B	9	4.75	0.94	8	0.75	7.5
6″	267 PSI	7	B	11	6.88	1	8	0.88	9.5
8″	267 PSI	7	B	13.5	8.88	1.12	8	0.88	11.75
10″	267 PSI	7	B	16	11	1.19	12	1	14.25
12″	267 PSI	7	B	19	13.13	1.5	12	1	17

Puhui Supply The Best Quality and Low Price HDPE pipes
To All Customers Worldwide.

The 24-hour contact information is as follows.

Email

[email protected]

Tel

+86 371 5606 1777

Mobile

+86 150 9310 0892

WhatsApp/Wechat

+86 150 9310 0892

Send Inquiry

Leave Your Message Here. Get A Quote Quickly Today!
Email:[email protected]
We will reply soon and protect your privacy.