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

• Pipe Flanges Raw Material Specifications
• Applications of flanges
• Flange Face Surface Finish
• Pressure Classes of Flanges
• Flanges Manufacturing Process
• Flange materials acc. to ASTM
• Stainless flange, Forged 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

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

• ASME/ANSI B16.5 Class 150 WN
• ASME/ANSI B16.5 Class 300 WN
• ASME/ANSI B16.5 Class 600 WN
• ASME/ANSI B16.5 Class 900 WN
• ASME/ANSI B16.5 Class 1500 WN
• ASME/ANSI B16.5 Class 2500 WN
• ASME B16.47 Series A/MSS SP-44 Class 150 WN
• ASME B16.47 Series A/MSS SP-44 Class 300 WN
• ASME B16.47 Series A/MSS SP-44 Class 600 WN
• ASME B16.47 Series A/MSS SP-44 Class 900 WN
• ASME B16.47 Series B/API 605 Class 75 WN
• ASME B16.47 Series B/API 605 Class 150 WN
• ASME B16.47 Series B/API 605 Class 300 WN
• ASME B16.47 Series B/API 605 Class 600 WN
• ASME B16.47 Series B/API 605 Class 900 WN
• BS 3293 Class 150 WN
• BS 3293 Class 300 WN
• BS 3293 Class 600 WN
• DIN 2631 PN 6
• DIN 2632 PN 10
• DIN 2633 PN 16
• DIN 2634 PN 25
• DIN 2635 PN40

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