How to get high quality Threaded Flanges?

What is a Threaded Flange?

threaded Flange is used for special circumstances with their main advantage being that they can be attached to the pipe without welding.  Sometimes a seal weld is also used in conjunction with the threaded connection.  This special type of flange is generally used for high pressure piping system, yet smaller diameter applications.  Obviously, the larger the flange is, the harder the ability to machine a thread would be.

Threaded Pipe Flanges Definition:

Threaded flange means the inner bore of a flange is thread, the shape of the threaded flange is like a slip on flange, so the threaded flange could be plate shape or with a hub for longer thread.

Threaded Flange Joint:

The threaded pipe flange is connected to a pipe with a external thread on the pipe end , so the flange thread should have same thread specification with the pipe thread, the advantage of a threaded flange is that the piping system would be easily to assembly because there is no welding in this piping joint.

Sealing of a Threaded Flange:

The Threaded flanges are usually supplied with a raised face (RF) or flat face (FF) sealing face. When a raised face is necessary for threaded pipe flanges, the standard height should be 1/16″ for the face under class400, If the threaded pipe flanges is same or more than class 400 , the standard threaded pipe flange raised face height should be 1/4″. 

The threaded pipe flange commonly used in a small sizes and not very high pressure situation. The threaded flange is no welding in the joint ,it means the flange could be used for some situations which is not able to arrange a welding work.

Threaded Flanges, TH Flanges

Threaded flanges are widely demanded as pipe flanges i.e called as threaded pipe flanges used in different industrial applications.
threaded flanges banner - How to get high quality Threaded Flanges?

Threaded Flanges are also known as screwed flange, and it is having a thread inside the flange bore which fits on the pipe with matching male thread on the pipe.

This type of joint connection is Speedy and simple but not suitable for high presser and temperature applications. Threaded Flanges are mostly used in utility services such as air and water.

Threaded (Screwed) flange is similar to the Slip-On flange, but the bore is threaded. Its chief merit is that it can be assembled withour welding, explaining its use in low pressure services at ordinary atmospheric temperatures, and in highly explosive areas where welding create a hazard.

flange type screwed flanges - How to get high quality Threaded Flanges?

Types of Screwed Flanges

The various types of threaded flanges are as follows:

  • Plain Threaded Flanges
  • Female Threaded Flanges
  • Male Threaded Flanges
Standards, Dimensions & Weight

Threaded Flanges can be used in very high pressure services and their major advantage is that they can be assembled without welding.

THREADED FLANGES EN 1092-1 (TYPE 13)

THREADED FLANGE EN 1092-1 / PN 6

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Rated Diameter Flange Neck Raised face Screws Weight of a flange (7,85 Kg/dm3)
d1 Thread k D b h1 d3 d4 f d2 Thread Bolt holes KG
15 21,3 R 1/2″ 55 80 12 20 30,0 40,0 2,0 11 M10 4 0,373
20 26,9 R 3/4″ 65 90 14 24 40,0 50,0 2,0 11 M10 4 0,584
25 33,7 R 1″ 75 100 14 24 50,0 60,0 2,0 11 M10 4 0,729
32 42,4 R 1-1/4″ 90 120 14 26 60,0 70,0 2,0 14 M12 4 1,040
40 48,3 R 1-1/2″ 100 130 14 26 70,0 80,0 3,0 14 M12 4 1,200
50 60,3 R 2″ 110 140 14 28 80,0 90,0 3,0 14 M12 4 1,340
65 76,1 R 2-1/2″ 130 160 14 32 100,0 110,0 3,0 14 M12 4 1,830
80 88,9 R 3″ 150 190 16 34 110,0 128,0 3,0 18 M16 4 2,750
100 114,3 R 4″ 170 210 16 40 130,0 148,0 3,0 18 M16 4 3,010
125 139,7 R 5″ 200 240 18 44 160,0 178,0 3,0 18 M16 8 4,300
150 168,3 R 6″ 225 265 18 44 185,0 202,0 3,0 18 M16 8 4,630

THREADED FLANGE EN 1092-1 / PN 16

20180130081519 97594 - How to get high quality Threaded Flanges?

Rated Diameter Flange Neck Raised face Screws Weight of a flange (7,85 Kg/dm3)
d1 Thread k D b h1 d3 d4 f d2 Thread Bolt holes KG
15 21,3 R 1/2″ 65 95 16 22 35,0 45,0 2,0 14 M12 4 0,722
20 26,9 R 3/4″ 75 105 18 26 45,0 58,0 2,0 14 M12 4 1,040
25 33,7 R 1″ 85 115 18 28 52,0 68,0 2,0 14 M12 4 1,250
32 42,4 R 1-1/4″ 100 140 18 30 60,0 78,0 2,0 18 M16 4 1,810
40 48,3 R 1-1/2″ 110 150 18 32 70,0 88,0 3,0 18 M16 4 2,060
50 60,3 R 2″ 125 165 18 28 84,0 102,0 3,0 18 M16 4 2,390
65 76,1 R 2-1/2″ 145 185 18 32 104,0 122,0 3,0 18 M16 4 2,970
80 88,9 R 3″ 160 200 20 34 118,0 138,0 3,0 18 M16 8 3,780
100 114,3 R 4″ 180 220 20 40 140,0 158,0 3,0 18 M16 8 4,380
125 139,7 R 5″ 210 250 22 44 168,0 188,0 3,0 18 M16 8 6,070
150 168,3 R 6″ 240 285 22 44 195,0 212,0 3,0 22 M20 8 7,240
Uses of threaded flanges :

Threaded flanges are threaded in the bore which match an external thread on the pipe. Threaded flanges are used with pipes that have external threads. The benefit of these flanges is that it can be attached without welding.

  • Threaded flanges can be fitted to pipes of various sizes without welding and this is one chief benefit for which these flanges are highly demanded.
  • They can be used in extremely high pressure applications, particularly at or near atmospheric temperature, where the necessary post weld heat treatment is not possible.
  • They are ideal for small diameter piping applications.
  • They are economical and time saving devices.
  • These threaded flanges are normally designed for non-cyclic applications.
  • The flanges are suitable to be used in applications where welding is hazardous.
  • They can be used in highly explosive areas.
Details of Threaded flange

They are the special type of pipe flanges which can be attached to the pipe without welding.

flg th det - How to get high quality Threaded Flanges?
1. Threaded flange 2. Thread 3. Pipe or Fitting

Threaded flanges are often used for small diameter, high pressure requirements. thread flanges with a hub have published specifications that range from 1/2″ thru 24″. 

Pressure

  • America Series: Class 150 ,Class 300, Class 600, Class 900A ,Class 1500,Class 2500.
  • Europe Series: PN2.5,PN6,PN10,PN16,PN25,PN40,PN63,PN100,PN160,PN250,PN320,PN400.

Flange Facing Types

  • America Series: Flat face(FF),Raised face(RF),Tongue(T),Groove(G),Female(F),Male(M),Ring type joints face(RJ/RTJ)
  • Europe Series: Type A(Flat Face),Type B(Raised Face),Type C(Tongue),Type D(Groove),Type E(Spigot),Type F(Recess),Type G(O-Ring Spigot),Type H(O-Ring Groove)
Material:
  • Carbon steel: ASTM A105,ASTM A105N,GB 20,C22.8.
  • Alloy steel: ASTM/ASME A182 F1-F12-F11-F22- F5-F9- F91
  • Stainless steel: ASTM/ASME A182 F304-304L-304H-304LN-304N
  • ASTM/ASME A182 F316-316L-316H-316LN-316N-316Ti
  • ASTM/ASME A182 F321-321H, F347-347H
  • Low temperature steel: ASTM/ASME A350 LF2.
  • High performance steel: ASTM/ASME A694 F42 , F52, F56, F60, F65, F70

Type:
Threaded Flanges, TH Flanges, Plain threaded flanges, Female threaded flanges, Male threaded flanges
Packing: plywood case and plywood pallet
Standards

  • ASME ANSI B16.5,ASME ANSI B16.47.
  • API 605,API 6L.
  • MSS SP 44
  • CSA Z245.12
  • EN1092-1,EN1759-1.
  • DIN2565, DIN2566, DIN2567, DIN2568, DIN2569
  • BS1560,BS 4504,BS 10.
  • AFNOR NF E29-200-1
  • ISO7005-1
  • AS2129
  • JIS B2220
  • UNI 2276. UNI 2277.UNI 2278 .UNI 6089 .UNI 6090

Industrial Processes

Die forging,Machining.

Application for threaded flanges

Natural gas,chemical,petroleum,ship building,marine,paper making, metallurgy, electric, power, boiler , etc.

Dimensional Tolerances of Threaded flanges ASME B16.5

20180130081705 30718 - How to get high quality Threaded Flanges?

Dimensions are in millimeters unless otherwise indicated.

OUTSIDE DIAMETER

≤ 24 = 1.6 mm
> 24 = ± 3.2 mm

INSIDE DIAMETER

≤ 10 = ± 0.8 mm
≥ 12 = + 1.6 mm / – 0 mm

DIAMETER OF CONTACT FACE

1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face
Tongue & Groove

Male-Female = ± 0.4 mm

DRILLING

Bolt Circle = 1.6 mm
Bolt Hole Spacing = ± 0.8 mm
Eccentricity of Bolt Circle with Respect to Facing
≤ 2½ = 0.8 mm max.
≥ 3 = 1.6 mm max.

DIAMETER OF COUNTERBORE

Same as for Inside Diameter

OUTSIDE DIAMETER OF HUB

≤ 12 = + 2.4 mm / – 1.6 mm
≥ 14 = ± 3.2 mm

THICKNESS

≤ 18 = + 3.2 mm / – 0
≥ 20 = + 4.8 mm / – 0

LENGTH THRU HUB

≤ 18 = + 3.2 mm / – 0.8 mm
≥ 20 = + 4.8 mm / – 1.6 mm

Source: China Threaded Flanges Manufacturer – Yaang Pipe Industry (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com

Please notice that you might be interested in the other technical articles we’ve published:

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References:

  • https://www.pipingonline.com/flanges/threaded_flange_en_1092-type_13_threaded_flange
  • https://www.yaang.com

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