Flange Types

A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification.

Materials for Flanges, Measure the size of a flange

Packing the pipe flange

Below are our available industrial pipe flanges that will meet your project needs. We will help you put together your entire project and ship it to your closest port.

We ship globally! Contact us to speak with one of our experienced staff, who can help you with your project needs.

Blind Flanges>>

The blind flange is used to close ends of piping systems. It is a kind of round plate with no center hold but with all the proper bolt holes.

Figure-8 Blanks >>

A figure-8 blank (also called a Spectacle Blind Flange) is a pressure-retaining plate with one solid end and one open end connected with a web or tie bar.

Lap Joint Flanges >>

The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face.

Orifice Flanges >>

Orifice flanges are used instead of the standard pipe flanges when orifice plate or flow nozzle is used.

Reducing Flanges >>

Reducing flanges are used in pipe-to-pipe connections. Reducing flanges are a little easier to bolt up than non-reducing flanges.

RTJ Flanges >>

Ring Type Joint Flange is a method of ensuring leak proof flange connection at high pressures.

Socket Welding Flanges >>

The socket welding flange is similar to a slip-on flange except it has a bore and a counterbore dimension.

Slip-On Flanges >>

The Slip-on flange has a low hub because the pipe slips into the flange prior to welding.

Threaded Flanges >>

Threaded (Screwed) flange is similar to the Slip-On flange, but the bore is threaded.

Welding Neck Flanges >>

The Welding neck flanges is normally referred to as the high hub flange.

Flanges process

Pipe flanges are manufactured in all the different materials like stainless steel, cast iron, aluminium, brass, bronze, plastic etc. but the most used material is forged carbon steel and have machined surfaces. In addition, flanges, like fittings and pipes, for specific purposes sometimes internally equipped with layers of materials of a completely different quality as the flanges themselves, which are "lined flanges". The material of a flange, is basically set during the choice of the pipe, in most cases, a flange is of the same material as the pipe. All flanges, discussed on this website fall under the ASME en ASTM standards, unless otherwise indicated. ASME B16.5 describes dimensions, dimensional tolerances etc. and ASTM the different material qualities.

Size: 1/2" NB To 24" NB.
Class: 150#, 300#, 600#, 900#, 1500# & 2500#.

In addition, we also can produce the DIN flange, and the forgings according to the customers drawings, for example, rings and shafts.

Delivery requirment:: Marking: SunnySteel, material grade, standard, specification, heat no.; Surface Treatment: Bright annealed, polished outside and inside surface.; Package: Each pipe in a PVC bag and caps on both ends then bundled in wood case, (option: Bundle with knitted plastic bag/stee crate. ); Inspection: Third party inspection, or by clints

ASTM A350 Standard Specification

ASTM A350 is the Standard Specification for Carbon and Low-Alloy Steel Forgings, Requiring Notch Toughness Testing for Piping Components

This specification covers several grades of carbon and low alloy steel forged or ring-rolled flanges, forged fittings and Valves for low-temperature service. The steel specimens shall be melt processed using open-hearth, basic oxygen, electric furnace or vacuum-induction melting. A sufficient discard shall be made to secure freedom from injurious piping and undue segregation. The materials shall be forged and shall undergo heat treatment such as normalizing, tempering, quenching and precipitation heat treatment. Heat analysis and product analysis shall be performed wherein the steel materials shall conform to the required chemical compositions of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, copper, columbium, vanadium, and nitrogen. The materials shall also undergo tension tests and shall conform to the required values of tensile strength, yield strength and elongation. Impact tests shall also be performed and the steel materials shall conform to the required values of minimum impact energy, temperature, and minimum equivalent absorbed energy. Hardness and hydrostatic tests shall also be performed.

Scope
1.1 This specification covers several grades of carbon and low-alloy steel forged or ring-rolled flanges, forged fittings and Valves intended primarily for low-temperature service and requiring notch toughness testing. They are made to specified dimensions, or to dimensional standards, such as the ASME and API Specifications referenced in Section . Although this specification covers some piping components machined from rolled bar and seamless tubular materials (see ), it does not cover raw material produced in these product forms.
1.2 No limitation on size is intended beyond the ability of the manufacturer to obtain the specified requirements. However, Class 3 of Grade LF787 is only available in the quenched-and-precipitation heat treated condition.
1.3 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified by the purchaser in the order.
1.4 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.
1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. Note 1Refer to Test Methods and Definitions A 370 for notes on significance of notched-bar impact testing.

Referenced Documents

A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A788/A788M Specification for Steel Forgings, General Requirements
A961/A961M Specification for Common Requirements for Steel Flanges, Forged Fittings, Valves, and Parts for Piping Applications
600 Steel Gate Valves with Flanged or Butt-Welding Ends
602 Compact Design Carbon Steel Gate Valves for Refinery Use
605 Large Diameter Carbon Steel Flanges
A5.1 Mild Steel Covered Arc-Welding Electrodes
A5.5 Low-Alloy Steel Covered Arc-Welding Electrodes
B16.10 Face-to-Face and End-to-End Dimensions of Ferrous Valves
B16.11 Forged Steel Fittings, Socket-Welding and Threaded
B16.30 Unfired Pressure Vessel Flange Dimensions
B16.34 Valves-Flanged, Threaded, and Welding End
B16.47 Large Diameter Steel Flanges
B16.5 Steel Pipe Flanges and Flanged Fittings
B16.9 Factory-Made Wrought Steel Butt-Welding Fittings
Section IX Welding Qualifications

Forged steel flanges

Forged flange is defined as a plate type device, normally round, that is attached to the end of a pipe, fitting, valve or other object to facilitate the assembly and disassembly of a piping system.

Forged steel flanges made of carbon steel or stainless steel, the materials conform to the JIS, ASTM A182,A105, DIN17100 ST-2 and BS standard. Dimension to be in accordance with JIS ANSI DIN BS standard accordingly.

The flanges are suitable for connection of steel pipes conveying mediums such as steam, oil, air and water. They are widely used in Chemical industry and Shipbuilding . And the flanges are suitable for welding.The flanges mainly include Welding Neck, Blind, Slip-on, Lap-Joint, Socket,Reducing and Plate type.

Size available:1/2"--72"(DN15-DN1800).

We can supply according to the customer's drawings or samples stating the materials used.

Forged flanges are manufactured in all the different materials to match the material of the pipe and fittings to which they are being attached. While some flanges are made of Cast Iron, the vast majority of flanges are forged carbon steel.

Forged steel flanges are made in seven primary ratings:

ANSI B 16.5 Class 150 lb
ANSI B 16.5 Class 400 lb
ANSI B 16.5 Class 900 lb
ANSI B 16.5 Class 2500 lb

ANSI B 16.5 Class 300 lb
ANSI B 16.5 Class 600 lb
ANSI B 16.5 Class 1500 lb

Forged flange

Forged flange is defined as a plate type device, normally round, that is attached to the end of a pipe, fitting, valve or other object to facilitate the assembly and disassembly of a piping system.

Forged steel flanges are made in seven primary ratings:

ANSI B 16.5 Class 150 lb
ANSI B 16.5 Class 400 lb
ANSI B 16.5 Class 900 lb
ANSI B 16.5 Class 2500 lb

ANSI B 16.5 Class 300 lb
ANSI B 16.5 Class 600 lb
ANSI B 16.5 Class 1500 lb

NW Long Weld Neck Flanges

The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange. The welding neck flange is the best designed butt-welded flange of those currently available because of its inherent structural value. It is expensive because of the design.

Key Features:

This is the most common type of high pressure pipe flange.
They are distinguished from other types of pipe flanges by their long tapered hub and gentle transition of thickness in the region of the butt weld joining them to the pipe.
The long tapered hub provides an important reinforcement of the weld neck flange proper in terms of strength and resistance to dishing.
Uses of weld neck flanges:
The weld neck flange is very resistant to dishing and has a very sturdy connection because it has the pipe along with the tapered hub.
The flanges are ideal for extreme fluctuations of temperature.
They are ideal in environments where there may be a lot of bending and handling of the flanges.
Preferred in an environment with extreme temperature conditions.
This type of flange is preferred for every severe service condition—resulting from high pressure or from sub-zero or elevated temperature.
They are used in situations where loading conditions are substantially constant or fluctuate between wide limits.
This is probably the best welding flange available because of its high, heavy neck.
Highly recommended wherever a sound welded joint connection is needed.

Tube OD sizes: 3/8 to 2 inches

Materials:
Flange: 304 or 316L stainless steel
O-rings: Viton, Buna, & silicone
Fasteners: Wingnut, SureSeal, bulkhead & EVAC clamps

Vacuum range

Elastomer seal: >=1 x 10^-8 Torr - High vacuum
EVAC metal seal: >=1 x 10^-11 Torr - UHV

Temperature range

Viton: -20°C to 200°C
Silicone: -50°C to 230°C
Buna: -30°C to 110°C
EVAC metal seal: -270°C to 150°C

Uses of weld neck flanges:

The weld neck flange is very resistant to dishing and has a very sturdy connection because it has the pipe along with the tapered hub.
The flanges are ideal for extreme fluctuations of temperature.
They are ideal in environments where there may be a lot of bending and handling of the flanges.
Preferred in an environment with extreme temperature conditions.
This type of flange is preferred for every severe service condition—resulting from high pressure or from sub-zero or elevated temperature.
They are used in situations where loading conditions are substantially constant or fluctuate between wide limits.
This is probably the best welding flange available because of its high, heavy neck.
Highly recommended wherever a sound welded joint connection is needed.

WN Flange

The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.

The welding neck flange is the best designed butt-welded flange of those currently available becuase of its inherent structural value. It is expensive because of the design.

Standards, Dimensions & Weight

Specifications:

Size: 1/2” to 60”, DN 12mm to DN 1500mm
Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
Facing: RF / RTJ

Material:

Cabon steel: A105, A350 LF2, C22.8, S355JR
Stainless steel: A182 F304/F304L/F316/F316L/F321
Alloy steel: F11, F12

Packing: plywood case and plywood pallet

DIN 2634 PN25

The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.

The welding neck flange is the best designed butt-welded flange of those currently available because of its inherent structural value. It is expensive because of the design.

Pipe			Flange				Neck				Raised face		Screws			Weight of a flange (7,85 Kg/dm3)
Rated Diameter	d1		D	b	k	h1	d3	s	r	h2	d4	f	Number	Thread	d2	Kg
	ISO Series 1	DIN Series 2
15	-	20	95	16	65	38	30	2	4	6	45	2	4	M 12	14	0,746
	21,3	-					32
20	-	25	105	18	75	40	38	2,3	4	6	58	2	4	M 12	14	1,06
	26,9	-					40
25	-	30	115	18	85	40	42	2,6	4	6	68	2	4	M 12	14	1,29
	33,7	-					45
32	-	38	140	18	100	42	52	2,6	6	6	78	2	4	M 16	18	1,88
	42,4	-					56
40	-	44,5	150	18	110	45	60	2,6	6	7	88	3	4	M 16	18	2,33
	48,3	-					64
50	-	57	165	20	125	48	72	2,9	6	8	102	3	4	M 16	18	2,82
	60,3	-					75
65	76,1	-	185	22	145	52	90	2,9	6	10	122	3	8	M 16	18	3,74
80	88,9	-	200	24	160	58	105	3,2	8	12	138	3	8	M 16	18	4,75
100	-	108	235	24	190	65	128	3,6	8	12	162	3	8	M 20	22	6,52
	114,3	-					134
125	-	133	270	26	220	68	155	4	8	12	188	3	8	M 24	26	9,07
	139,7	-					162
150	-	159	300	28	250	75	182	4,5	10	12	218	3	8	M 24	26	11,8
	168,3	-					192
(175)	193,7	-	350	28	280	75	218	5,6	10	15	248	3	12	M 24	26	13,4
200	219,1	-	360	30	310	80	244	6,3	10	16	278	3	12	M 24	26	17
250	-	267	425	32	370	88	292	7,1	12	18	335	3	12	M 27	30	24,4
	273	-					298
300	323,9	-	485	34	430	92	352	8	12	18	395	4	16	M 27	30	31,2
350	355,6	-	555	38	490	100	398	8	12	20	450	4	16	M 30	33	47,2
	-	368														44,2
400	406,4	-	620	40	550	110	452	8,8	12	20	505	4	16	M 33	36	61,7
	-	419														57,9
(450)	457	-	670	42	600	110	500	8,8	12	20	550	4	20	M 33	36	71,9
500	508	-	730	44	660	125	558	10	12	20	615	4	20	M 33	36	89,6
600	610	-	845	46	770	125	660	11	12	20	720	5	20	M 36	39	104
700	711	-	960	46	875	125	760	13	20	24	820	5	24	M 39	42	136
800	813	-	1085	50	990	135	865	14	22	24	930	5	24	M 45	48	186
900	914	-	1185	54	1090	145	968	16	24	28	1030	5	28	M 45	48	236
1000	1016	-	1320	58	1210	155	1070	18	24	28	1140	5	28	M 52	56	307

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Get in touch

Welcome to Sunny Steel Enterprise Ltd.

Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.
You can get in touch by telephone, post, online or E-mail.
Please check the help section first to see if your question may be answered there.

Address: Siping Road, Shanghai,200081, China
Telephone:+8621 3378 0199
Fax number: :+8621 6185 1035
E-mail: sales@sunnysteel.com | sunnysteel@163.com

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