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.
2. Types of Screwed Flanges
The various types of threaded flanges are as follows:
- Plain Threaded Flanges
- Female Threaded Flanges
- Male Threaded Flanges
3. 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.
- ASME/ANSI B16.5 Class 150 TH
- ASME/ANSI B16.5 Class 300 TH
- ASME/ANSI B16.5 Class 600 TH
- ASME/ANSI B16.5 Class 900 TH
- DIN 2565 PN6
- DIN 2566 PN10
4. 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.
5. Details of Threaded flange
They are the special type of pipe flanges which can be attached to the pipe without welding.
Details of Threaded flange
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 class: Class 150 to Class 2,500, PN 2.5 to PN 250
Facing: RF / RTJ
6. Threaded Flange Material Grade Available in HT pipe
| Material Grade | Nickel Alloy Steel | ASTM/ASME B/SB564 UNS N02200(NICKEL 200), UNS N04400(MONEL 400), |
| UNS N08825( INCOLOY 825), UNS N06600(INCONEL 600), |
| UNS N06601(INCONEL 601), UNS N06625(INCONEL 625), UNS N10276(HASTELLOY C276), |
| ASTM/ASME B/SB160 UNS N02201(NICKEL 201), ASTM B/SB472 UNS N08020(Alloy 20) |
| Copper Alloy | ASTM/ASME B/SB151 UNS C70600(CuNi 90/10), C71500(CuNi 70/30) |
| Stainless Steel | ASTM/ASME A/SA182 F304,304L,304H,309H,310H,316,316H,316L,316LN, |
| 317,317L,321,321H,347,347H |
| Duplex and Super Duplex Steel | ASTM/ASME A/SA182 F44,F45,F51,F53,F55,F60,F61 |
| Carbon steel | ASTM /ASME A/SA105(N) |
| Low Temp Carbon Steel | ASTM/ASME A/SA350 LF2 |
| High Yield Carbon Steel | ASTM/ASME A/SA694 F52, F56 F60, F65, F70 |
| Alloy Steel | ASTM/ASME A/SA182 GR F5,F9, F11,F12,F22,F91 |
| Titanium | ASTM/ASME B/SB381 Grade 2, Grade 5, Grade 7 |
