NS Flanges

Understanding your choice of NS flanges options

When you select a NS Flange, you should consider some crucial factors, such as the material of the flange, the pressure rating, the size, and the type of connection. Additionally, you must ensure that the flange meets the relevant industry standards and regulations.

What are NS flanges?

Norwegian Standard Flange (NS Flange) is a type of flange that is commonly used in Norway and other Scandinavian countries. NS Flanges are designed to meet the specifications set by the Norwegian Standard (NS), which is a set of technical standards developed by the Norwegian Standardization Authority (NS-INSTA).

What are the different types of NS flanges?

Flanges come in many different types and styles, but some common types of NS flanges include:

Types of NS flanges

The United Nations International (NS) standard for flanges is widely recognized and used in many industries worldwide. NS flanges come in different types, each with unique characteristics and applications. We introduce you to the most common types of NS flanges, including weld neck flanges, Threaded flanges, Flat flanges, Lap joint flanges, Blind flanges, and Slip-on flanges.

1. Weld neck flanges are widely used in high-pressure applications. The weld neck flange is designed to be welded to a pipe‘s end, which creates a smooth and robust connection that can withstand high pressure. This flange type is ideal for applications where the pipeline must withstand high temperatures, such as in the oil and gas industry.

2. Threaded flanges are similar to weld neck flanges, but instead of being welded to the end of the pipe, they are screwed onto the pipe’s end. Threaded flanges are used for low-pressure applications and are easy to install and maintain. These flanges are commonly used in plumbing and small-scale industrial applications.

3. Flat flanges, also known as plate flanges, are flat and thin, making them ideal for low-pressure applications where space is limited. They are easy to install and maintain and are commonly used in small-scale piping systems.

4. Lap joint flanges are designed to be used with a lap joint stub end. The loose flange slides over the stub end and is bolted to the flange on the adjoining pipe or fitting. This flange type is used in applications where frequent dismantling is required, such as in pipelines that need to be cleaned regularly.

5. Blind flanges, also known as blanking flanges, are used to seal off the end of a pipe. This flange is commonly used in the oil and gas industry to seal off a pipeline that is no longer used.

6. Slip-on flanges are similar to flat flanges but have a slightly larger diameter and are designed to slide over the end of a pipe. They are then welded in place to create a strong and secure connection. Slip-on flanges are used in low-pressure applications and are commonly used in small-scale piping systems.

Flange Face Finish

Flange face finish is a crucial factor in ensuring proper sealing between flange connections. There are several types of flange face finishes available, each with its unique characteristics and benefits.
Types of Flange Face Finish
One type of flange face finish is the serrated finish. This finish is created by machining a series of grooves into the flange face, providing better grip and improved sealing when compressed. Serrated finishes are commonly used in applications where the flange connection may be subject to vibration or movement.
Another type of flange face finish is the stock finish. This is the default finish provided by the manufacturer, and it typically has a smooth surface. While it may not offer the same grip as a serrated finish, a stock finish is suitable for many standard applications.

Spiral serrated finishes feature a spiral pattern of grooves that helps to distribute stress evenly across the flange face. This can help to prevent damage and distortion, which can lead to leaks or other issues.

Concentric serrated finishes are similar to spiral serrated finishes but feature a series of concentric rings around the flange face. This pattern can provide enhanced sealing and grip compared to other types of serrated finishes.

Finally, a smooth finish is another option for flange face finish. Smooth finishes are often used in applications where the flange connection is not subject to significant movement or vibration. While it may not offer the same grip as a serrated finish, a smooth finish can still provide a reliable seal in many standard applications.

For example:

Machining of gasket faces of flanges to a smooth finish of Ra = 3.2 – 6.3 micrometer (= 125 – 250 microinches AARH)

• AARH stands for Arithmetic Average Roughness Height. It is used to measure the roughness (rather smoothness) of surfaces. 125 AARH means 125 micro inches will be the average height of the ups and downs of the surface.
• 63 AARH is specified for Ring Type Joints.
• 125-250 AARH (it is called smooth finish) is specified for Spiral Wound Gaskets.
• 250-500 AARH (it is called stock finish) is specified for soft gaskets such as NON Asbestos, Graphite sheets, Elastomers etc. If we use smooth finish for soft gaskets enough “biting effect” will not occur and hence the joint may develop leak.
• Sometimes AARH is referred also as Ra which stands for Roughness Average and means the same.

Selecting the appropriate flange face finish is essential to ensuring a proper seal between flange connections. Whether you choose a serrated finish, stock finish, spiral serrated, concentric serrated, or smooth finish, it is important to consider the specific application and potential stresses that the flange connection may face. By selecting the right finish for the job, you can help to prevent leaks and other issues that can lead to costly downtime and repairs.

Standard Specication For NS Flanges

• Dimensions : ANSI B16.5, ANSI B16.47 Series A & B, NS, ASA, API-605, AWWA, Custom Drawings
• Size : 1/2″ (15 NB) to 48″ (1200NB)
• Class : 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
• DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629,
• DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636,DIN2637, DIN2638, DIN2673
• BS : BS4504 , BS4504, BS1560, BS10
• Flange Face Type : Flate Face (FF), Raised Face(RF), Ring Type Joint (RTJ)

Material of NS Flanges

The selection of materials for NS Flanges typically varies according to the specific application and desired properties. Carbon steel, stainless steel, cast iron, brass, and aluminum are common materials used for manufacturing NS Flanges. The selection process usually considers factors like temperature, pressure, the corrosiveness of the fluid or gas being conveyed, and any applicable regulatory requirements or industry standards. Therefore, some of the materials commonly utilized for NS flanges comprise:

Stainless Steel NS Flange	ASTM/ASME A/SA182:- F304, F304L, F316, F316L, ASTM/ASME A/SA351:- CF3, CF3M, CF8, CF8M, DIN 1.4306, DIN 1.4301, DIN 1.4404, DIN 1.4401, DIN 1.4408, DIN 1.4308, DIN 1.4306, DIN 1.4409
Duplex NS Flange	S31803 / S32205 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex NS Flange	S32750 / S32760 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Copper Nickel NS Flange	ASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Titanium NS Flange	ASTM B381 / ASME SB381:- Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7, ASTM R50250/GR.1|R50400/GR.2|R50550/GR.3|R50700/GR.4|GR.6|R52400/GR.7| R53400/GR.12|R56320/GR.9| R56400/GR.5
Copper NS Flange	TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000, C12200, C12300, T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910, C10920, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Incoloy NS Flange	ASTM B564 / ASME SB564:- Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925
Inconel NS Flange	ASTM B564 / ASME SB564:- Inconel 600, 601, 625, 718, 783, 690, x750
Nickel NS Flange	ASTM B564 / ASME SB564:- Nickel 200, Nickel 201, Nickel 205, Nickel 205LC
Hastelloy NS Flange	ASTM B564 / ASME SB564:- Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X
Monel NS Flange	ASTM B564 / ASME SB564:- Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Carbon Steel NS Flange	ASTM/ASME A/SA105 A/SA105N and A/SA216-WCB, DIN 1.0460, DIN 1.0402, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, CS High Yield ASTM A694 / A694 (F52, F56, F60, F65, F70, F80)
Alloy Steel NS Flange	ASTM A182 / ASME SA182:- F5, F9, F11, F12, F22, F91
Alloy 20 NS Flange	ASTM B462 / ASME SB462:- Carpenter 20 Alloy, Alloy 20Cb-3
254 SMO NS Flange	ASTM A182 / ASME SA182:- SMO 254/6Mo, UNS S31254, DIN 1.4547
Aluminium NS Flange	5052 /6061/ 6063 / 2017 / 7075 / etc.
Brass NS Flange	3602 / 2604 / H59 / H62 / etc.
Other NS Flange material	Tin bronze, Alumunum bronze, Lead bronze, Nimonic 75, Nimonic 80A, Nimonic 90, AISI 4140, AISI 4130, Mild Steel, Al6XN

Size of NS Flanges

The size of NS flanges depends on the expected pipe diameter, with standard sizes typically ranging from DN15 to DN1000. While larger NS flanges can be manufactured, such custom fabrication is not standard. It is important to select the proper NS flange size to ensure a secure connection and avoid leaks.

Dimensions of NS Flanges

The most commonly used flange types in NS standards include NS 2527 flange, NS 2540 flange, NS 2548 flange, NS 2538 flange, NS 2539 flange, NS 2526 flange,NS 2537 flange,NS 2525 flange, NS 2542 flange, NS 2576 flange. Each flange type has standard dimensions; some of the common ones include the following:

• Outside diameter (OD): The overall dimension of the flange, which is the outside diameter of the flange.

• Bolt Circle Diameter (BCD): The circle’s diameter that holds the bolt in place.

• Several bolt holes: The number of bolt holes in the flange.

• Bolt hole diameter: The diameter of the bolt hole.

• Thickness: The thickness of the flange.

The exact dimensions of each NS flange type can be found in the NS standard, but these dimensions may vary depending on the flange’s specific size and pressure class.

The exact dimensions of each NS flange type can be found in the NS standard, but these dimensions may vary depending on the flange’s specific size and pressure class.

Flat Flanges According to Norwegian Standards (NS)

Flat Flanges According to NS 2525 NP 6

Pipe		Flange Dimensions					Screws			Weight (kg)
DN mm	d1	d3		D	b	k	buc	filet	d2	(7.85Kg/dm3)
ND mm	mm	mm		mm	mm	mm	n	thread	mm
15	21.3	22		80	12	55	4	M10	11	0.41
20	26.9	27.5		90	14	65	4	M10	11	0.6
25	33.7	34.5		100	14	75	4	M10	11	0.74
32	42.4	43		120	16	90	4	M12	14	1.19
40	48.3	49	0.5	130	16	100	4	M12	14	1.39
50	60.3	69	0	140	16	110	4	M12	14	1.53
65	76.1	77		160	16	130	4	M12	14	1.89
80	88.9	90		190	18	150	4	M16	18	2.98
100	11.,3	115.5		210	18	170	4	M16	18	3.46
125	139.7	141.5		240	20	200	8	M16	18	4.6
150	168.3	170.5		265	20	225	8	M16	18	5.22
200	219.1	221.5	1	320	22	280	8	M16	18	7.15
250	273	276	0	375	24	350	12	M16	18	9.61
300	323.9	327		440	24	395	12	M20	22	12.6
Flanges from carbon steel or stainless steel not in stock can be delivered in about 10-15 days.

Flat Flanges According to NS 2526 NP 10

Pipe		Flange Dimensions					Screws			Weight (kg)
DN mm	d1	d3		D	b	k	buc	filet	d2	(7.85Kg/dm3)
ND mm	mm	mm		mm	mm	mm	n	thread	mm
For flanges with nominal diameter less than 200mm see NS 2527 NP 16
200	219.1	221.5		340	24	295	8	M20	22	9.38
250	273	276		395	26	350	12	M20	22	11.9
300	323.9	327	1	445	26	400	12	M20	22	13.7
350	355.6	359	0	505	28	460	16	M20	22	20.4
400	406.4	410		565	32	515	16	M24	26	27.7
(450)	456	461		615	34	565	20	M24	26	31.9
500	508	512		670	34	620	20	M24	26	36.3
600	610	614		780	36	725	20	M27	30	47.3
700	711	716	2	895	38	840	24	M27	30	64.3
800	813	818	0	1015	42	950	24	M30	33	84.1
900	914	920		1115	46	1050	28	M30	33	107
1000	1016	1022		1230	52	1160	28	M33	36	140
Flanges from carbon steel or stainless steel not in stock can be delivered in about 10-15 days.

Flat Flanges According to NS 2527 NP 16

Pipe		Flange Dimensions					Screws			Weight (kg)
DN mm	d1	d3		D	b	k	buc	filet	d2	(7.85Kg/dm3)
ND mm	mm	mm		mm	mm	mm	n	thread	mm
15	20	21		95	12	65	4	M12	14	0.574
	21.3	22
20	25	26		105	14	75	4	M12	14	0.818
	26.9	27.5
25	30	31		115	14	85	4	M12	14	1.03
	33.7	34.5
32	38	39	0.5	140	16	100	4	M16	18	1.66
	42.4	43	0							1.62
40	48.3	49		150	16	110	4	M16	18	1.85
50	60.3	61		165	18	125	4	M16	18	2.46
65	76.1	77		185	18	145	4	M16	18	2.99
80	88.9	90		200	20	160	8	M16	18	3.61
100	114.3	115.5		220	22	180	8	M16	18	4.39
125	139.7	141.5		250	24	210	8	M16	18	5.88
150	168.3	170.5		285	24	240	8	M20	22	7.12
(175)	193.7	196		315	26	270	8	M20	22	9.13
200	219.1	221.5		340	26	295	12	M20	22	9.7
250	273	276	1	405	32	355	12	M24	26	15.7
300	323.9	327	0	460	32	410	12	M24	26	19.1
350	355.6	359		520	36	470	16	M24	26	29
400	406.4	410		580	38	525	16	M27	30	36
(450)	456	461		640	38	585	20	M27	30	41.9
500	508	512		715	40	650	20	M30	33	56
600	610	614		840	44	770	20	M33	36	82.1
700	711	716	2	910	48	840	24	M33	36	84.2
800	813	818	0	1025	52	950	24	M36	39	114
900	914	920		1125	56	1050	28	M36	39	134
1000	1016	1022		1255	60	1170	28	M39	42	184
Flanges from carbon steel or stainless steel not in stock can be delivered in about 10-15 days.

Flat Flanges According to NS 2529 NP 40

Pipe		Flange Dimensions						Screws
DN mm	d1 mm	d3 mm		D mm	b mm	k	d4 mm	buc	filet	d2 mm
ND mm						mm		n	thread
40	48.3	49	0.5	150	18	110	43	4	M16	18
50	60.3	69	0	165	20	125	55	4	M16	18
65	76.1	77		185	24	145	70	8	M16	18
80	88.9	90		200	24	160	83	8	M16	18
100	114.3	115.5		235	26	190	107	8	M20	22
125	139.7	141.5		270	26	220	132	8	M24	26
150	168.3	170.5		300	28	250	158	8	M24	26
200	219.1	221.5	1	375	32	320	207	12	M27	30
250	273	276	0	450	36	385	259	12	M30	33
Flanges from carbon steel or stainless steel not in stock can be delivered in about 10-15 days.

Wall Flanges According to Norwegian Standards (NS)

Set-on Flange According to NS 2537 NP 10

 

Pipe (mm)		Flange Dimensions				Plate	Screws				Weight (kg)
DN	d	d1 mm	D mm	t mm	k	d3 mm	n	Filet d2 mm	a	b mm	(7.85Kg/dm3)
ND	d				mm			Thread d2 mm	mm
15	21.3	36	95	28	65	24	4	M12	14	20	1,26
20	26.9	42	105	28	75	30	4	M12	14	20	1,53
25	33.7	49	115	28	85	37	4	M12	14	20	1,80
32	42.4	57	140	33	100	45	4	M16	19	25	3,17
40	48.3	63	150	33	110	51	4	M16	19	25	3,61
50	60.3	75	165	33	125	63	4	M16	19	25	4,24
65	76.1	91	185	33	145	79	4	M16	19	25	5,12
80	88.9	104	200	33	160	92	8	M16	19	25	5,62
100	114.3	130	220	33	180	118	8	M16	19	25	6,09
125	139.7	156	250	33	210	144	8	M16	19	25	7,45
150	168.3	184	285	33	240	172	8	M20	23	29	10,50
You may observe that for flanges with the nominal diameter 15 to 150mm the meassurement are identical NS 2538 PN 16
200	219.1	246	340	38	295	224	8	M20	23	29	12,30
250	273	290	395	38	350	278	12	M20	23	29	16,00
300	323.9	342	445	38	400	330	12	M20	23	29	18,10
350	355.6	374	505	38	460	362	16	M20	23	29	25,80
400	406.4	425	565	44	515	413	16	M24	28	34	35,70
450	457	476	615	44	565	464	20	M24	28	34	38,70
500	508	528	670	44	620	516	20	M24	28	34	43,70
These flanges, from carbon steel or stainless steel, are not in stock they can be delivered only on special order.

Set-on Flange According to NS 2538 NP 16

Pipe (mm)		Flange Dimensions				Plate	Screws				Weight (kg)
DN	d	d1 mm	D mm	t mm	k	d3 mm	n	Thread d2 mm	a	b mm	(7.85Kg/dm3)
ND	d				mm				mm
15	21.3	36	95	28	65	24	4	M12	14	20	1,26
20	26.9	42	105	28	75	30	4	M12	14	20	1,53
25	33.7	49	115	28	85	37	4	M12	14	20	1,80
32	42.4	57	140	33	100	45	4	M16	19	25	3,17
40	48.3	63	150	33	110	51	4	M16	19	25	3,61
50	60.3	75	165	33	125	63	4	M16	19	25	4,24
65	76.1	91	185	33	145	79	4	M16	19	25	5,12
80	88.9	104	200	33	160	92	8	M16	19	25	5,62
100	114.3	130	220	33	180	118	8	M16	19	25	6,09
125	139.7	156	250	33	210	144	8	M16	19	25	7,45
150	168.3	184	285	33	240	172	8	M20	23	29	10,50
200	219.1	246	340	38	295	224	8	M20	23	29	12,30
250	273	290	395	38	355	278	12	M20	23	29	16,00
300	323.9	342	445	38	410	330	12	M20	23	29	18,10
350	355.6	374	505	38	470	362	16	M20	23	29	25,80
400	406.4	425	565	44	525	413	16	M24	28	34	35,70
450	457	476	615	44	585	464	20	M24	28	34	38,70
500	508	528	670	44	650	516	20	M24	28	34	43,70
These flanges, from carbon steel or stainless steel, are not in stock they can be delivered only on special order.

Set-in Flanges According to NS 2539 NP 10

Pipe (mm)		Flange Dimensions				Screws				Weight (kg)
DN	d	d1 mm	D mm	t mm	k	n	Filet d2 mm	a	b mm	(7.85Kg/dm3)
ND	d				mm		Thread d2 mm	mm
15	21.3	15	95	33	65	2x 4	M12	14	20	1.7
20	26.9	20	105	33	75	2x 4	M12	14	20	2.07
25	33.7	25	115	33	85	2x 4	M12	14	20	2.47
32	42.4	32	140	33	100	2x 4	M16	19	25	3.5
40	48.3	43	150	33	110	2x 4	M16	19	25	3.93
50	60.3	55	165	33	125	2x 4	M16	19	25	4.64
65	76.1	70	185	33	145	2x 4	M16	19	25	5.68
80	88.9	82	200	33	160	2x 8	M16	19	25	6.21
100	114.3	107	220	33	180	2x 8	M16	19	25	6.96
125	139.7	132	250	33	210	2x 8	M16	19	25	8.61
150	168.3	160	285	38	240	2x 8	M20	23	29	12
You may observe that for flanges with the nominal diameter 15 to 150mm the meassurement are identical NS 2540 PN 16
200	219.1	210	340	38	295	2x 8	M20	23	29	15,70
250	273	260	395	38	350	2×12	M20	23	29	19,10
300	323.9	310	445	38	400	2×12	M20	23	29	22,30
350	355.6	350	505	38	460	2×16	M20	23	29	28,90
400	406.4	400	565	44	515	2×16	M24	28	34	39,50
450	457	450	615	44	565	2×20	M24	28	34	43
500	508	500	670	44	620	2×20	M24	28	34	49,30
These flanges, from carbon steel or stainless steel, are not in stock they can be delivered only on special order.

Set-in Flanges According to NS 2540 NP 16

Pipe (mm)		Flange Dimensions				Screws				Weight (kg)
DN	d	d1 mm	D mm	t mm	k	n	Filet d2 mm	a	b mm	(7.85Kg/dm3)
ND	d				mm		Thread d2 mm	mm
15	21.3	15	95	33	65	2x 4	M12	14	20	1.7
20	26.9	20	105	33	75	2x 4	M12	14	20	2.07
25	33.7	25	115	33	85	2x 4	M12	14	20	2.47
32	42.4	32	140	33	100	2x 4	M16	19	25	3.5
40	48.3	43	150	33	110	2x 4	M16	19	25	3.93
50	60.3	55	165	33	125	2x 4	M16	19	25	4.64
You may observe that for flanges with the nominal diameter 15 to 50mm the meassurement are identical NS 2542 PN 40
65	76.1	70	185	33	145	2x 4	M16	19	25	5.68
You may observe that for flange with the nominal 80mm the meassurement are identical NS 2542 PN 40
80	88.9	82	200	33	160	2x 8	M16	19	25	6.21
100	114.3	107	220	33	180	2x 8	M16	19	25	6.96
125	139.7	132	250	33	210	2x 8	M16	19	25	8.61
150	168.3	160	285	38	240	2x 8	M20	23	29	12
175	193.7	185	315	38	270	2x 8	M20	23	29	14.2
200	219.1	210	340	38	295	2×12	M20	23	29	15.2
250	273	260	405	44	355	2×12	M24	28	34	23.4
300	323.9	310	460	44	410	2×12	M24	28	34	28.6
350	355.6	350	520	44	470	2×16	M24	28	34	36.4
400	406.4	400	580	49	525	2×16	M27	31	39	47.8
450	457	450	640	49	585	2×20	M27	31	39	55.7
500	508	500	715	55	650	2×20	M30	34	43	79.2
These flanges, from carbon steel or stainless steel, are not in stock they can be delivered only on special order.

Set-in Flanges According to NS 2542 NP 40

Pipe (mm)		Flange Dimensions				Screws				Weight (kg)
DN	d	d1 mm	D mm	t mm	k	n	Filet d2 mm	a	b mm	(7.85Kg/dm3)
ND	d				mm		Thread d2 mm	mm
15	21.3	15	95	33	65	2x 4	M12	14	20	1.7
20	26.9	20	105	33	75	2x 4	M12	14	20	2.07
25	33.7	25	115	33	85	2x 4	M12	14	20	2.47
32	42.4	32	140	33	100	2x 4	M16	19	25	3.5
40	48.3	43	150	33	110	2x 4	M16	19	25	3.93
50	60.3	55	165	33	125	2x 4	M16	19	25	4.64
65	76.1	70	185	33	145	2x 8	M16	19	25	5.4
80	88.9	82	200	33	160	2x 8	M16	19	25	6.21
100	114.3	107	235	38	190	2x 8	M20	23	29	9.19
125	139.7	132	270	44	220	2x 8	M24	28	34	13.2
150	168.3	160	300	44	250	2x 8	M24	28	34	15.6
175	193.7	185	350	49	295	2×12	M27	31	39	22.6
200	219.1	210	375	49	320	2×12	M27	31	39	25.1
250	273	260	450	55	385	2×12	M30	34	43	40.1
These flanges, from carbon steel or stainless steel, are not in stock, they can be delivered only on special order.

Blind Flanges According to Norwegian Standards (NS)

Blind Flanges According to NS 2545 NP 10

DN	Dimensiunile flansei				Suruburi			Masa (kg)
mm	Flange Dimensions				Screws			Weight (kg)
ND	d1	D	b	k	buc	filet	d2	(7.85Kg/dm3)
mm	mm	mm	mm	mm	n	thread	mm
For nominal diametres 15-175mm see NS 2546 NP 16
200	190	340	24	295	8	M20	22	17
250	235	395	26	350	12	M20	22	24.5
300	285	445	26	400	12	M20	22	31.8
350	330	506	26	460	16	M20	22	41
400	380	565	26	515	16	M24	26	51.2
450	425	615	28	565	20	M24	26	65.2
500	475	670	28	620	20	M24	26	78
600	580	780	32	725	20	M27	30	121
700	680	895	36	840	24	M27	30	179
800	785	1015	40	950	24	M27	30	255
Flanges from carbon steel or stainless steel not in stock can be delivered in about 10-15 days.

Blind Flanges According to NS 2546 NP 16

DN mm	Dimensiunile flansei				Suruburi			Masa (kg)
	Flange Dimensions				Screws			Weight (kg)
ND mm	d1 mm	D mm	b mm	k	buc	filet	d2 mm	(7.85Kg/dm3)
				mm	n	thread
15	–	95	14	65	4	M12	14	0.72
20	–	105	16	75	4	M12	14	1.01
25	–	115	16	85	4	M12	14	1.23
32	–	140	16	100	4	M16	18	1.8
40	–	150	16	110	4	M16	18	2.09
50	–	165	18	125	4	M16	18	2.88
65	55	185	18	145	4	M16	18	3.66
80	70	200	20	160	8	M16	18	4.77
100	90	220	20	180	8	M16	18	5.65
125	115	250	22	210	8	M16	18	8.42
150	140	285	22	240	8	M20	22	10.4
175	165	345	24	270	8	M20	22	14
200	165	340	24	295	12	M20	22	16.1
250	190	405	26	355	12	M24	26	24.9
300	235	460	28	410	12	M24	26	35.1
350	285	520	30	470	16	M24	26	47.8
400	330	580	32	525	16	M27	30	63.5
450	380	640	34	585	20	M27	30	84.2
500	425	715	36	650	20	M30	33	102
Flanges from carbon steel or stainless steel not in stock can be delivered in about 10-15 days.

Blind Flanges According to NS 2547 NP 40

DN	Dimensiunile flansei				Suruburi			Masa (kg)
mm		Flange Dimensions				Screws		Weight (kg)
ND	d1	D	b	k	buc	filet	d2	(7.85Kg/dm3)
mm	mm	mm	mm	mm	n	thread	mm
15	–	95	16	65	4	M12	14	0.81
20	–	105	18	75	4	M12	14	1.24
25	–	115	18	85	4	M12	14	1.38
32	–	140	18	100	4	M16	18	2.03
40	–	150	18	110	4	M16	18	2.35
50	–	165	20	125	4	M16	18	3.2
65	–	185	22	145	8	M16	18	4.29
80	–	200	24	160	8	M16	18	5.88
100	–	235	24	190	8	M20	22	7.54
125	–	270	26	220	8	M24	26	10.8
150	–	300	28	250	8	M24	26	14.5
200	–	375	34	320	12	M27	30	27.2
250	–	450	38	385	12	M30	30	43.8
300	–	515	42	450	16	M30	30	63.3
350	–	580	46	510	16	M33	36	89.5
400	–	660	50	585	16	M36	39	127
450	–	685	54	610	20	M36	39	151
500	–	755	56	670	20	M39	42	172
Flanges from carbon steel or stainless steel not in stock can be delivered in about 10-15 days.

Manufacturing process of NS flange

NS flanges can be produced by forging, casting, cutting or rolling. We mainly produce flanges by forging, cutting and rolling processes.

Manufacturing process of NS forged flange

The welding neck flanges shall be forged steel, and the blind flanges may be made from either forged steel or from steel plate.

• Raw material inspection – The key raw material used to produce flanges is billet or hot rolled bar stock. All raw materials purchased are supplied with test reports in accordance with British Standards with full traceability. This is the first mandatory step in the flange production process to ensure good quality. The raw materials are retested in-house to ensure chemical composition, mechanical properties and metallographic analysis.
• Cutting of raw materials – Correct and strict control of cutting sizes and proportions ensures full cost control.
• Heating – This is a very important step for the quality of the flanges. It is necessary to keep detailed records of heating temperatures to avoid overheating. Overheating can damage the structure of the metal and the mechanical properties of the raw material.
• Forging – The forging process is divided into free forging and die forging. The forging time and strength of flanges vary for different pressure classes.
• Heat treatment-The purpose of heat treatment is to eliminate the stress inside the flange and make the density more uniform. Careful recording of heat treatment temperature and cooling time is the key.
• Inspection of forging blanks – After the heat treatment process, select batch samples are tested again for chemical composition and mechanical properties to ensure that all items pass.
• Machining of forging blanks – During machining, inspection is performed along with machining to ensure that each part of the flange is qualified. Machining is performed on CNC and/or lathes.
• Finished Product Inspection – The finished product will be inspected 100% prior to delivery to ensure that the goods meet NS, ASME, EN or customer standards.
• Documented Documentation – The entire production process and quality checks at different levels are documented according to NS compliant standard operating procedures. This is the guarantee of good quality.
• Test certificates: As we are an NS and PED certified manufacturer, we can issue test certificates for all goods upon delivery and inspection in accordance with British Standards.
• Packaging: All forgings and flanges are packed in wooden boxes or crates or pallets to ensure safe movement of the goods.

Manufacturing process of NS plate cutting flange

The process here is relatively simple, and the key raw material is hot rolled plate. The process is mainly used to produce lower thickness sliding plate flanges and blind flanges. All plates purchased are accompanied by a test certificate to NS Standards.
The circles are cut from the plates.
No heat treatment is involved in the flange manufacturing process.
Drilling and machining is carried out on the circles to obtain the required dimensions.
The goods are visually inspected and marked in accordance with the relevant standards.

Marking of NS Flanges

NS Flanges are typically marked with various information that helps identify the flange’s characteristics and properties. The markings can vary slightly depending on the specific standard and type of flange. Here are some typical markings found on NS flanges:

• Manufacturer’s name or trademark.
• Flange standard designation (e.g., NS 2278-67).
• Nominal pipe size (NPS) or nominal bore size (DN).
• Pressure rating (PN) or pressure class (e.g., PN 16 or Class 150).
• Material identification (e.g., carbon steel, stainless steel, etc.).
• Heat code or heat number (used for traceability).
• Identify the flange’s facing type (e.g., raised face, flat face, ring type joint, etc.).
• Bolt hole diameter and several bolt holes.
• Manufacturing date or code.

Any additional markings or symbols required by the specific standard or application.
Specific markings may only be present on particular flanges, and some industries or applications may require additional markings. It is crucial to verify that the markings on the flange meet the necessary specifications for the intended use to guarantee proper fit and optimal performance.

Packing of NS Flanges

How to package NS flanges?

Packaging NS flanges typically involves the following steps:

• 1. Clean the Flanges: Before packaging, ensure that the NS flanges are thoroughly cleaned and free from debris or contaminants.
• 2. Wrap the Flanges: Wrap each NS flange individually with a layer of protective material, such as bubble wrap or foam, to prevent them from being scratched or damaged during transportation.
• 3. Choose a Sturdy Box: It’s crucial to select a sturdy box that is appropriate for the flanges. This will prevent them from moving around and potentially getting damaged.
• 4. Add Protective Fillers: Once the box has been chosen, add protective fillers such as packing peanuts or air pillows to the empty spaces between the flanges. This will prevent them from shifting during transport, providing an extra layer of protection.5. Seal the Box: Use strong packing tape to close and seal the box. Make sure that the video is applied evenly and covers all seams and corners of the box.
• 6. Label the Box: It’s essential to label your package with all the necessary shipping information. Make sure to include the destination address, return address, and any handling instructions to ensure your package arrives at its intended location without any issues.
• 7. Choose a Reliable Shipping Service: A reliable and trusted shipping service is crucial to ensure your package is handled and delivered safely and on time. Research different shipping services and choose the one that best fits your needs, considering factors such as speed, cost, and package size.

Following these steps, you can effectively package NS flanges for safe and secure transportation.

Inspection and measurement of NS Flanges

The examination and quantification of NS flanges encompass evaluating their material composition, dimensions, surface texture, alignment of bolt holes, size of bolt holes, and thread used in bolt holes.
Material:
NS flanges are typically made from carbon steel, stainless steel, or alloy steel. The choice of material depends on the specific application and the environmental conditions to which the flange will be exposed. The most common material for NS flanges is carbon steel, which is known for its high strength and durability.
Dimension:
The dimension of a NS flange is an essential factor to consider, as it affects the overall performance and compatibility with other components in the system. The dimensions of NS flanges are standardized, with different classes and sizes available. The dimensions of a NS flange are typically specified in millimeters and include the outer diameter, inner diameter, thickness, and height.
Surface Finish:
The surface finish of a NS flange is an essential factor to consider, as it affects the seal between the flange and the gasket. A smooth surface finish is necessary to ensure a tight seal and prevent leaks. The surface finish of NS flanges is typically specified in micrometers, with different classes and ranges available.
Bolt Hole Alignment:
The bolt-hole alignment of a NS flange is an essential factor to consider, as it affects the ease of installation and the system’s overall stability. The bolt holes must be appropriately aligned to ensure that the bolts can be tightened uniformly and that the flange can be securely attached to other components in the system.
Bolt Hole Size:
The bolt-hole size of a NS flange is an essential factor to consider, as it affects the compatibility with other components in the system. The bolt hole size must be large enough to accommodate the bolts that attach the flange to other system members.
Bolt Hole Thread:
The bolt-hole thread of a NS flange is an essential factor to consider, as it affects the compatibility with the bolts that will be used to attach the flange to other components in the system. The bolt-hole thread must be compatible with the bolts and be of the correct size and pitch.
By paying attention to these factors, you can ensure that your NS flanges are compatible with other components in the system and will perform reliably over the long term.

Application of NS Flanges

NS Flanges are known to deliver exceptional performance and are generally developed for meeting the demands. These NS Flange is use in various industries like:

• Stainless Steel NS Flange uses in Oil and Gas Pipeline;
• NS Flange uses in Chemical Industry;
• NS Flange uses in Plumbing;
• NS Flange uses in Heating;
• NS Flange uses in Water Supply Systems;
• NS Flange uses in Power Plant;
• NS Flange uses in Paper & Pulp Industry;
• NS Flange uses in General Purpose Applications;
• Steel NS Flange uses in Fabrication Industry;
• NS Flange uses in Food Processing Industry;
• NS Flange uses in Structural Pipe.

How to purchase the correct NS flanges?

Purchasing the right NS flange can be daunting whether you are a seasoned professional or new to the industry. From determining the materials needed to considering the price, several factors exist. We will detail the steps required to purchase the correct NS flange for your needs.

Determining the required materials

The first step in purchasing the correct NS flange is determining the required material. Various materials, including carbon steel, stainless steel, and alloy steel, can make NS flanges. Your choice of material will depend on the application and environment in which you will use the flange. For instance, if you need a flange for high-temperature or corrosive environments, the best choice is high-temperature stainless steel or alloy.

Identifying Flange Types

After identifying the desired material, you must determine the flange type. NS provides various flanges, such as butt-weld flanges, sliding flanges, threaded flanges, and socket weld flanges. Each class has unique features and benefits, and the choice depends on specific needs. For instance, high-pressure applications typically use butt-weld flanges, while low-pressure applications generally use slip-on flanges.

Determine flange size and pressure rating.

After determining the flange type, you must select the size and pressure rating. Various sizes and pressure ratings of NS flanges are available, and choosing the correct size and pressure rating is critical to ensure that the flange works appropriately. Be sure to refer to industry standards and regulations when determining the right size and pressure rating for your needs.

Look for quality and certification.

Quality and certification are critical when purchasing NS flanges. Look for flanges manufactured to industry standards and undergo strict quality control measures. In addition, look for flanges that have been certified by recognized organizations such as ISO, API, and ASME. These certifications show that the flanges have been tested and meet industry standards for quality and performance.

Consider Price

Finally, consider the price when purchasing NS flanges. One should think about price and prioritize quality and performance when purchasing. Be sure to compare multiple suppliers’ prices and consider additional costs, such as shipping and handling.

Purchasing the correct NS flange requires careful consideration of several factors. By determining the materials needed, identifying the flange type, choosing the flange size and pressure rating, looking for quality and certifications, and considering the price, you can make an informed decision and select the correct NS flange for your needs.

How to select NS flanges manufacturer?

If you’re in need of NS flanges, choosing a manufacturer that you can rely on is crucial. With a wide variety of options available, it can be challenging to identify the one that can provide you with high-quality products and exceptional customer service. We’ll discuss the essential factors you should consider when selecting a NS flange manufacturer.
Quality of Products
When it comes to NS flanges, quality is king. When selecting a manufacturer, it is crucial to prioritize their reputation for producing high-quality products. To ensure that the flanges you receive are durable, reliable, and meet industry standards, consider a manufacturer that utilizes premium materials like stainless steel or carbon steel, and has an established quality control process in place. These factors are indicative of a trustworthy manufacturer who prioritizes excellence and reliability in their products.
Industry Experience
When selecting NS flanges, it is imperative to take into account the manufacturer’s level of industry experience. A well-established company with a long-standing history of producing high-quality NS flanges will undoubtedly have a proven track record of success. Opting for a manufacturer with ample experience will guarantee that your flanges will be precisely crafted to meet your specifications. Additionally, an experienced manufacturer can offer invaluable insights and recommendations on which flanges are best suited for your unique application.
Production Capacity
When selecting a manufacturer, it’s crucial to take into account their production capacity. You must ascertain whether they can handle large or intricate orders and whether they can meet delivery deadlines. To guarantee a satisfactory outcome, it’s advisable to choose a manufacturer with a spacious production facility and a proficient workforce. This will ensure that your order is processed promptly and to your precise specifications.
Pricing
When choosing a manufacturer, it’s essential to consider more than just the price. While cost is undoubtedly an important factor, it shouldn’t be the only consideration. It’s crucial to select a manufacturer that provides competitive pricing while still maintaining the highest quality standards. It’s important to remember that the cheapest option may not always be the most cost-effective one in the long run, as it could end up costing you more due to lower-quality products. Therefore, it’s crucial to balance affordability and quality to make a wise decision when selecting a manufacturer.
Customer Service
When selecting a manufacturer, it’s essential to take their level of customer service into account. To ensure a positive experience, opt for a company that is highly responsive to your inquiries, maintains clear communication throughout the ordering process, and offers a satisfaction guarantee. An excellent manufacturer should be dedicated to your satisfaction and willing to collaborate with you to resolve any problems that may arise. By prioritizing customer service, you can have confidence in your decision and enjoy a stress-free experience.
It’s crucial to select a manufacturer that provides excellent customer service, as this will ensure that you have a smooth and hassle-free experience from start to finish. By taking all of these factors into consideration, you can feel confident that you’ve made the best possible choice for your NS flange needs.

Why Choose Jihua to Be Your NS Flange Supplier?

If you’re looking for a reliable and trustworthy supplier of NS flanges, consider choosing Jihua. As a well-established and reputable manufacturer and supplier of high-quality NS flanges, Jihua has been satisfying customers worldwide for many years. Here are some reasons why Jihua might be the best fit for your NS flange needs:

• First and foremost, Jihua is committed to providing high-quality NS flanges made from top-quality materials and manufactured to the highest standards. The company maintains strict quality control procedures to ensure that each product meets or exceeds customer expectations.
• Additionally, Jihua offers competitive pricing on its products, which means you can get high-quality NS flanges at an affordable price. This cost-effectiveness is due to Jihua’s efficient manufacturing and distribution processes.
• Moreover, Jihua offers a wide range of NS flanges, including ANSI, DIN, JIS, EN, and other international standards. This diverse product range allows you to find the right product to meet your specific needs.
• Furthermore, Jihua is committed to providing excellent customer service and support to all of its customers. The company has a team of experienced professionals who are available to answer any questions or concerns you may have.
• Lastly, Jihua understands the importance of timely delivery and works hard to ensure that all orders are shipped out quickly and efficiently. This ensures that you receive your order in a timely manner, which is especially important for time-sensitive projects.

Jihua is a reliable and trustworthy supplier of NS flanges that can meet your needs and exceed your expectations. Choose Jihua for high-quality products, competitive pricing, a wide range of products, excellent customer service, and fast delivery.

Export Country For NS Flanges

MIDDLE EAST	AFRICA	NORTH AMERICA	EUROPE	ASIA	SOUTH AMERICA
Saudi Arabia	Nigeria	Usa	Russia	India	Argentina
Iran	Algeria	Canada	Norway	Singapore	Bolivia
Iraq	Angola	Mexico	Germany	Malaysia	Brazil
Uae	South Africa	Panama	France	Indonesia	Chile
Qatar	Libya	Costa Rica	Italy	Thailand	Venezuela
Bahrain	Egypt	Puerto Rica	Uk	Vietnam	Colombia
Oman	Sudan	Trinidad And Tobago	Spain	South Korea	Ecuador
Kuwait	Equatorial Guinea	Jamaica	Ukraine	Japan	Guyana
Turkey	The Republic Of Congo	Bahamas	Netherland	Sri Lanka	Paraguay
Yemen	Gabon	Denmark	Belgium	Maldives	Uruguay
Syria			Greece	Bangladesh
Jordan			Czech Republic	Mayanmar
Cyprus			Portugal	Taiwan
			Hungary	Cambodia
			Albania
			Austria
			Switzerland
			Slovakia
			Finland
			Ireland
			Croatia
			Slovenia
			Malta