Pipe Gaskets

We manufacture and supply pipe gaskets, otherwise known as flange gaskets, in a range of materials. We hold dedicated tooling for the majority of standard sizes and tables and can manufacture special or one-offs to your own measurements and specifications. If you can’t find the information you’re looking for here, or wish to place an order then please contact us. The prices of pipe gaskets depend upon volume, material and thickness so please contact us for a quotation.

Different Types of Pipe Gaskets

The most commonly used gaskets in piping are standard flange gaskets in rubber or fibre, or spiral wounds. For particularly large pipes, gaskets can be manufactured in segments of rubber and joined together.

Standard Sizes and Dimensions

Pipe gaskets are made to fit the size of standard pipes or flanges. The most common standards are BS10 (British/Australian), PN/DIN (European), ASA/ANSI (USA) and JIS/KS (Japanese/Korean).

For ease of reference you can download some of the most common pipe gasket dimension charts here.

• Gasket Tables for PN Designated Flanges (DIN)

(To BS EN 1514-1:1967. PN 6, PN 10, PN 16, PN 25, PN 40)

• Gaskets for Class designated Flanges Suitable for ANSI Standard Flanges (ASA)

(To BS EN 12560-1:2001: ASME B16.21 Class 150, Class 300, Class 600; ASME B16.47 A Class 150, Class 300, Class 600; ASME B16.47 B Class 150, Class 300, Class 600)

• Gasket Tables for BS10 Flanges

(To BS 3063:1965: Table A, Table B, Table E, Table F, Table H, Table J, Table K)

Material Selection

Pipe gaskets can be manufactured from many different gasket materials. The right material to use depends upon the application and the environment in which the gasket will be used. The contents of the pipe, including the range of temperatures and pressures under which it is expected to operate will dictate material selection. Material specification should also take into account the flange being used. If you are in doubt about which material you need, please contact us for technical support.

A non-asbestos fibre or graphite material can be specified for steam applications. For diesel or other fuels a non-asbestos fibre or quality nitrile rubber (BS 2751) should be used. Because of the extra additives in modern fuels, lower grade nitrile can be affected and break down. This is mistakenly blamed on the fuel itself when in reality it is caused by the corrosive nature of the additive.

If you are specifying for a particular chemical then please see our guide to gasket chemical resistance.

What is the Minimum/Maximum Thickness for Pipe Gaskets?

The thickness of a pipe gasket is governed by several requirements. The condition of the surface of the flange face has an important part to play. A thicker gasket may be required for a poor quality surface, as it will flow into and takes up the deformities on the face ensuring a good seal. With a clean and smooth flange face, a thinner gasket can be considered.

Pressure and media are other factors that can decide the thickness of gasket required. Putting too thick a gasket into a flange joint will increase the surface area that the system pressure can work against. For this reason, as a general rule: the thinner the gasket the better.

Common thicknesses of gasket material for pipe flanges are 1.5mm and 3mm.

Full-Face or IBC Gaskets

Pipe gaskets can be either full-faced or inner bolt circle (IBC). Full faced gaskets have bolt holes in them and cover a large part of the face of the flange. IBC gaskets, otherwise known as ring-type or raised-faced joints, sit inside the bolts fastening the pipe flanges.

What Standards Cover Pipe Gaskets?

The most common standards are:

• BS10:2009: British Standard specification for flanges and bolting for pipes, valves and fittings.
• DIN: Deutsches Institut für Normung (the German Institute for Standardisation).
• ANSI: the American National Standards Institute.
• ASA: the American Standards Association (now ANSI).
• ASME: the American Society of Mechanical Engineers The ASME B16.47 Series A and B took over from MSS SP-44 (Series A) and API 605 (Series B)
• ISO: International Organisation for Standardisation.
• JIS: Japanese Industrial Standards.

British and European Standards

The current standard for use in the UK and Europe is BS EN 1514-1:1997. This standard took over from BS 4865-1:1989 for PN flanges.

Other standards include:

• BS EN 12560-1:2001: Flanges and their joints. Gaskets for Class-designated flanges. Non-metallic flat gaskets with or without inserts
• BS EN 12560-2:2013: Flanges and their joints. Dimensions of gaskets for Class-designated flanges. Spiral wound gaskets for use with steel flanges
• BS EN 12560-3:2001: Flanges and their joints. Gaskets for Class-designated flanges. Non-metallic PTFE envelope gaskets
• BS EN 14772:2005: Flanges and their joints. Quality assurance inspection and testing of gaskets in accordance with the series of standards EN 1514 and EN 12560

Made to Measure Flange Gaskets

Some pipes or tanks are fabricated for particulat purposes and as such do not conform to set standards and dimensions. For these situations we manufacture bespoke pipe gaskets in either small batch quantities or as one-off specials.

If you are in any doubt as to whether you require a standard size or a special then please contact us with the dimesions and we will be able to tell you. See below for more information on how to specify a gasket.

How to Specify a Pipe Gasket

If you know the standard size of gasket you require then we will simply need to know: the material required; the thickness required; whether you need full-faced or IBC gaskets and the quantity.

If the part is a special, in addition to the above information we will also need to know: the outer diameter (O.D.), the inner diameter (I.D.), the pitch circle diameter (P.C.D.) and the number of holes.

We may also need to know: the operationg conditions (chemical resistance required, operating temperature, operating pressure and state of the flanges).

Increasing Chemical Resistance

The chemical resistance of a pipe gasket can be increased by being lined with a PTFE envelope, or bore-liner. This is a much more cost effective alternative than using a solid PTFE gasket. The PTFE envelope fits over the pipe gasket and serves to protect it from decomposition by the aggressive chemicals in the pipe. If you have particular chemical resistance requirements then please let us know when you specify your gasket.

Torque Settings

Torque settings are determined by the type and thickness of the flange material, the bolt material and by the gasket material. The correct torque settings for the flange bolts should be sourced from the flange supplier/manufacturer or the pipe system designer.

Flange Bolt Tightening Sequence

To obtain a leak-free flange connection a proper gasket installation is needed. The bolts must be given the correct bolt tension and the total bolt strength must be evenly divided over the whole flange face.

On the first pass lightly tighten the first bolt then the bolt directly across, or 180º from the first bolt. Move 90º round the pipe for the third bolt and then directly across for the fourth. Continue this sequence until all bolts are tightened.

More information can be found in our gasket fitting guide.

The above information should only be used as a guide. Please contact RAM to discuss your application.

Gaskets for PN 16 Flanges

PN 16 gaskets are some of the most commonly used sizes of standard pipe gaskets.PN 16 gaskets can be manufactured either as IBC gaskets (sitting inside the bolt circle of the flange) or as full faced gaskets (with bolt holes) to cover the face of the flange.

All standard pipe gaskets can be made from a range of materials such as rubbers, corks, and non-asbestos fibres. The gasket material used will depend upon the application. For instance the internal conditions – what is in the pipeline (and so the temperature, pressure, and chemical resistance required) and the external environment of the pipe (air temperature, presence of chemicals etc.). If you need help specifying the material for your application then please contact us for technical advice.

PN 16 Gasket Dimensions

This chart covers gaskets for PN 16 designated flanges (DIN) to BS EN 1514-1:1967.

IBC Gasket (mm)			Full Face Gasket (mm)
N-Bore	OD	ID	OD	ID	Holes	Dia.	P.C.D.
10	45	18	90	18	4	14	60
15	50	22	95	22	4	14	65
20	60	28	105	28	4	14	75
25	70	35	115	35	4	14	85
32	82	43	140	43	4	18	100
40	92	49	150	49	4	18	110
50	107	61	165	61	4	18	125
65	127	77	185	77	8	18	145
80	142	90	200	90	8	18	160
100	162	115	220	115	8	18	180
125	192	141	250	141	8	18	210
150	218	169	285	169	8	22	240
200	273	220	340	220	12	22	295
250	329	274	405	274	12	26	355
300	384	325	460	325	12	26	410
350	444	356	520	356	16	26	470
400	492	407	580	407	16	30	525
450	555	458	640	458	20	30	585
500	617	508	715	508	20	33	650
600	734	610	840	610	20	36	770
700	804	712	910	712	24	36	840
800	911	813	1025	813	24	39	950
900	1011	915	1125	915	28	39	1050
1000	1128	1016	1255	1016	28	42	1170
1100	1228	1120	1355	1120	32	42	1270
1200	1342	1220	1485	1220	32	48	1390
1400	1542	1420	1685	1420	36	48	1590
1500	1654	1520	1820	1520	36	56	1710
1600	1764	1620	1930	1620	40	56	1820
1800	1964	1820	2130	1820	44	56	2020
2000	2168	2020	2345	2020	48	62	2230

You can download the full set of tables for PN designated flanges here.

Manufacture

Pipe gaskets are manufactured by using a tool to press-cut the material. RAM holds dedicated tooling for the majority of standard pipe gasket sizes. For the larger sizes, gaskets are produced in segments on an electronic cutting table then joined together.

Lead Time

Our standard lead time is 7-10 working days. However, small quantities can occasionally be produced for delivery next working day. Please contact us if you have an urgent requirement.

Price

Prices for standard pipe gaskets depend upon volume and material specifications. Please contact us for a quotation.

Gaskets for ASA 150 Flanges

ASA 150 gaskets are some of the most commonly used sizes of standard pipe gaskets. ASA 150 gaskets can be manufactured either as IBC gaskets (sitting inside the bolt circle of the flange) or as full faced gaskets (with bolt holes) to cover the face of the flange.

All standard pipe gaskets can be made from a range of materials such as rubbers, corks and non-asbestos fibres. The gasket material used will depend upon the application. For instance the internal conditions – what is in the pipeline (and so the temperature, pressure and chemical resistance required) and the external environment of the pipe (air temperature, presence of chemicals etc.). If you need help specifying the material for your application then please contact us for technical advice.

ASA 150 Gasket Dimensions

This chart covers gaskets for ASME B16.21 150 designated flanges (ASA) to BS EN 12560-1:2001.

IBC Gasket (mm)				Full Face Gasket (mm)
N-Bore (in)	mm	OD	ID	OD	ID	Holes	Dia.	P.C.D.
½	15	48	21	89	21	4	16	60
¾	20	57	27	95	27	4	16	70
1	25	67	33	108	33	4	16	79
1 ¼	32	76	42	117	42	4	16	89
1 ½	40	86	48	127	48	4	16	98
2	50	105	60	152	60	4	19	121
2 ½	65	124	73	178	73	4	19	140
3	80	137	89	191	89	4	19	152
3 ½	90	162	102	216	102	8	19	178
4	100	175	114	229	114	8	19	191
5	125	197	141	254	141	8	22	216
6	150	222	168	279	168	8	22	241
8	200	279	219	343	219	8	25	298
10	250	340	273	406	273	12	25	362
12	300	410	324	483	324	12	29	432
14	350	451	356	533	356	12	29	476
16	400	514	406	597	406	16	32	540
18	450	549	457	635	457	16	32	578
20	500	606	508	699	508	20	32	635
24	600	718	610	813	610	20	35	749

You can download the full set of tables for ASME designated flanges here.

Manufacture

Pipe gaskets are manufactured by using a tool to press-cut the material. RAM holds dedicated tooling for the majority of standard pipe gaskets sizes. For the larger sizes, gaskets are produced in segments on an electronic cutting table and then joined together.

Lead Time

Our standard lead time is 7-10 working days. However, small quantities can occasionally be produced for delivery next working day. Please contact us if you have an urgent requirement.

Price

Prices for standard pipe gaskets depend upon volume and material specifications. Please contact us for a quotation.

Gaskets for PN 10 Flanges

PN 10 gaskets are some of the most commonly used sizes of standard pipe gaskets. PN 10 gaskets can be manufactured either as IBC gaskets (sitting inside the bolt circle of the flange) or as full faced gaskets (with bolt holes) to cover the face of the flange.

All standard pipe gaskets can be made from a range of materials such as rubbers, corks and non-asbestos fibres. The gasket material used will depend upon the application. For instance the internal conditions – what is in the pipeline (temperature, pressure and chemical resistance required) and the external environment of the pipe (air temperature, presence of chemicals etc.). If you need help specifying the material for your application then please contact us for technical advice.

PN 10 Gasket Dimensions

This chart covers gaskets for PN 10 designated flanges (DIN) to BS EN 1514-1:1967.

IBC Gasket (mm)			Full Face Gasket (mm)
N-Bore	OD	ID	OD	ID	Holes	Dia.	P.C.D.
10	45	18	90	18	4	14	60
15	50	22	95	22	4	14	65
20	60	28	105	28	4	14	75
25	70	35	115	35	4	14	85
32	82	43	140	43	4	18	100
40	92	49	150	49	4	18	110
50	107	61	165	61	4	18	125
65	127	77	185	77	8	18	145
80	142	90	200	90	8	18	160
100	162	115	220	115	8	18	180
125	192	141	250	141	8	18	210
150	218	169	285	169	8	22	240
200	273	220	340	220	8	22	295
250	328	274	395	274	12	22	350
300	378	325	445	325	12	22	400
350	438	356	505	356	16	22	460
400	489	407	565	407	16	26	515
450	539	458	615	458	20	26	565
500	594	508	670	508	20	26	620
600	695	610	780	610	20	30	725
700	810	712	895	712	24	30	840
800	917	813	1015	813	24	33	950
900	1017	915	1115	915	28	33	1050
1000	1124	1016	1230	1016	28	36	1160
1100	1231	1120	1340	1120	32	39	1270
1200	1341	1220	1455	1220	32	39	1380
1400	1548	1420	1675	1420	36	42	1590
1500	1658	1520	1785	1520	36	42	1700
1600	1775	1620	1915	1620	40	48	1820
1800	1972	1820	2115	1820	44	48	2020
2000	2182	2020	2325	2020	48	48	2230

You can download the full set of tables for PN designated flanges here.

Manufacture

Pipe gaskets are manufactured by using a tool to press-cut the material. RAM holds dedicated tooling for the majority of standard pipe gasket sizes. For the larger sizes gaskets are produced in segments on an electronic cutting table and then joined together.

Lead Time

Our standard lead time is 7-10 working days. However, small quantities can occasionally be produced for delivery next working day. Please contact us if you have an urgent requirement.

Price

Prices for standard pipe gaskets depend upon volume and material specifications. Please contact us for a quotation.

Gaskets for PN 6 Flanges

PN 6 gaskets are some of the most commonly used sizes of standard pipe gaskets. PN 6 gaskets can be manufactured either as IBC gaskets (sitting inside the bolt circle of the flange) or as full faced gaskets (with bolt holes) to cover the face of the flange.

All standard pipe gaskets can be made from a range of materials such as rubbers, corks, and non-asbestos fibres. The gasket material used will depend upon the application. For instance the internal conditions – what is in the pipeline (temperature, pressure, and chemical resistance required) and the external environment of the pipe (air temperature, presence of chemicals etc.). If you need help specifying the material for your application then please contact us for technical advice.

PN 6 Gasket Dimensions

This chart covers gaskets for PN 6 designated flanges (DIN) to BS EN 1514-1:1967.

IBC Gasket (mm)			Full Face Gasket (mm)
N-Bore	OD	ID	OD	ID	Holes	Dia.	P.C.D.
10	45	18	90	18	4	14	60
15	50	22	95	22	4	14	65
20	60	28	105	28	4	14	75
25	70	35	115	35	4	14	85
32	82	43	140	43	4	18	100
40	92	49	150	49	4	18	110
50	107	61	165	61	4	18	125
65	127	77	185	77	8	18	145
80	142	90	200	90	8	18	160
100	162	115	220	115	8	18	180
125	192	141	250	141	8	18	210
150	218	169	285	169	8	22	240
200	273	220	340	220	12	22	295
250	329	274	405	274	12	26	355
300	384	325	460	325	12	26	410
350	444	356	520	356	16	26	470
400	492	407	580	407	16	30	525
450	555	458	640	458	20	30	585
500	617	508	715	508	20	33	650
600	734	610	840	610	20	36	770
700	804	712	910	712	24	36	840
800	911	813	1025	813	24	39	950
900	1011	915	1125	915	28	39	1050
1000	1128	1016	1255	1016	28	42	1170
1100	1228	1120	1355	1120	32	42	1270
1200	1342	1220	1485	1220	32	48	1390
1400	1542	1420	1685	1420	36	48	1590
1500	1654	1520	1820	1520	36	56	1710
1600	1764	1620	1930	1620	40	56	1820
1800	1964	1820	2130	1820	44	56	2020
2000	2168	2020	2345	2020	48	62	2230

You can download the full set of tables for PN designated flanges here.

Manufacture

Pipe gaskets are manufactured by using a tool to press-cut the material. RAM holds dedicated tooling for the majority of standard pipe gasket sizes. For the larger sizes, gaskets are produced in segments on an electronic cutting table then joined together.

Lead Time

Our standard lead time is 7-10 working days. However, small quantities can occasionally be produced for delivery next working day. Please contact us if you have an urgent requirement.

Price

Prices for standard pipe gaskets depend upon volume and material specifications. Please contact us for a quotation.