- Stainless Steel Flanges
- Stainless Steel Forged Flanges
- ASTM A182 Blind Flange
Stainless Steel Flanges
A stainless steel flange is an important part of any piping system. They are multifunctional and permit the user to not only clean and modify but also inspect the piping system with much desired ease. Being a top Stainless Steel Flanges manufacturers in India we produce different kinds of flanges in an assortment of sizes and materials.
Though the recommendation of the alloy grade, size of the flange and kind of flange to be used will all depend on the nature of the application. Take for instance a SS blind flange, which is typically used to seal either a pressure vessel or the ends of a piping system. If this blind flange, or what is also referred to as a SS plate flange is to be used in the petrochemical or the oil and gas refineries, an alloy grade that is corrosion resistant and has good mechanical properties are to be considered. In this case, the blind stainless steel forged flange could be produced from either grade 316 or 317, both of which have excellent properties.
On the other hand, SS weld neck flange, which is very popular in process piping could be considered for the chemical processing industry, because they offer the highest joint integrity. Therefore a stainless steel weld neck flange could find use in high pressured applications. Speaking about low temperature & low pressure applications, nothing beats the performance of a stainless steel slip on flange. If corrosion resistance is the main concern of the client, he can always opt for a SS threaded flange, which has external threads and does not require the flange to be welded with the advantage of being fastened securely to the piping system.
Standard Specification of Stainless Steel Flanges
| Stainless Steel Flanges size range | 1/2Inch (15 NB) to 48 Inch(1200NB) |
|---|---|
| Stainless Steel Forged Flanges Standards | American Society of Mechanical Engineers B16.5, B16.47, B16.48, British Standard 10, European standards-1092, American National Standards Institute Flanges, |
| ASTM A182 Blind Flange ANSI Standard | Class 150, 300, 600, 900, 1500, 2500 LBS |
| SS Flanges DIN Standard | 6 to 40 Bar / PN 6 To Pn 64 |
| ASME B16.5 Flange JIS Standard | 5, 10, 16, 20, 30, 40, 63 K |
Weight chart of Stainless Steel Forged Flanges
| Standard | Class | Diameter | Bolt Circle Diameter | Bolt Size | Diameter of Bolt Hole |
|---|---|---|---|---|---|
| AS4087 Flanges | PN14 | 95 | 67 | M12 | 14 |
| AS 2129 Flange | C | 95 | 67 | 13 | 14 |
| D | 95 | 67 | 13 | 14 | |
| E | 95 | 67 | 13 | 14 | |
| F | 95 | 67 | 13 | 14 | |
| H | 114 | 83 | 16 | 17 | |
| J | 114 | 83 | 16 | 17 | |
| ANSI B16.5 Flanges | 150 | 89 | 60 | 13 | 16 |
| 300 | 95 | 67 | 13 | 16 | |
| 600 | 95 | 67 | 13 | 16 | |
| 900 | 121 | 83 | 19 | 22 | |
| 1500 | 121 | 83 | 19 | 22 | |
| ISO 7005 (DIN) Flange | PN6 | 80 | 55 | M10 | 11 |
| PN10 | 95 | 65 | M12 | 14 | |
| PN16 | 95 | 65 | M12 | 14 | |
| PN20 | 90 | 60.5 | M14 | 16 | |
| PN25 | 95 | 65 | M12 | 14 | |
| PN40 | 95 | 65 | M12 | 14 |
ASTM A182 Blind Flange Schedule Chart
| Flange Schedule/Class | Pipe Size - Pipe Flange | Flange Connection Type | Max. Pressure |
|---|---|---|---|
| ASME B16.5 Class 150 | 1/2" | FNPT | 150 psi |
| ASME B16.5 Class 150 | 1/2" | Socket Weld | 275 psi |
| ASME B16.5 Class 150 | 1/2" | Welded | 150 psi |
| ASME B16.5 Class 150 | 3/4" | FNPT | 150 psi |
| ASME B16.5 Class 150 | 3/4" | Socket Weld | 275 psi |
| ASME B16.5 Class 150 | 1-1/4" | Socket Weld | 275 psi |
| ASME B16.5 Class 150 | 1-1/2" | Socket Weld | 275 psi |
| ASME B16.5 Class 150 | 2" | FNPT | 150 psi |
| ASME B16.5 Class 150 | 2" | Socket Weld | 275 psi |
| ASME B16.5 Class 150 | 2-1/2" | Socket Weld | 275 psi |
| ASME B16.5 Class 150 | 3" | Socket Weld | 275 psi |
| ASME B16.5 Class 150 | 4" | FNPT | 150 psi |
| ASME B16.5 Class 150 | 4" | Socket Weld | 275 psi |
| ASME B16.5 Class 300 | 1/2" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 1/2" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 1" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 1" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 1-1/4" | FNPT | 720 psi |
| ASME B16.5 Class 300 | 1-1/4" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 1-1/2" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 1-1/2" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 2" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 2" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 2-1/2" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 2-1/2" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 3" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 3" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 4" | Slip On | 720 psi |
| ASME B16.5 Class 300 | 4" | Slip On | 720 psi |
Available Inventory of ANSI 150 Stainless Steel Flanges
- ANSI 150 Stainless Steel Flanges
- ASME B16.5 Flange
- SS Pipe Flange
Why ANSI B16 5 flange pressure ratings are better in stainless steel?
It is always been noted that varying materials tend to have a different pressure rating under similar conditions. This phenomenon is based on the characteristics of that particular material, namely its microstructure, ductility, malleability, heat resistance, toughness and its ability to withstand demanding applications without wearing out. Flanges produced under the ANSI B16.5 specification can be in any material in the following seven pressure ratings i.e. 150, 300, 400, 600, 900, 1500, and 2500. In comparison to alloy steel or carbon steel, there are varied grades of stainless steel. Each stainless steel has a differing chemical composition, thus making them well suited to different sectors. Moreover, the chemistry of stainless steel grades such as alloy 304 or 316 could be altered by controlling the composition of carbon to either increase its creep resistance or to enhance its weldability. Unlike carbon steel grades, which have good toughness, stainless steel grades have the ability to resist creep and thus do not succumb to getting damaged.
A pressure rating or what could also be referred to as a pressure class is the maximum pressure a component or in this case, a flange is capable of withstanding at a given temperature under normal circumstances. Typically a higher pressure rating is associated with a thicker walled flange, which will not rupture. Since the pressure rating of the flange is affected by the temperature of the application;the higher the temperature of the process, the lesser the ability of the flange to withstand pressure. A high pressure rating would mean that the thickness of the wall and weight would be much higher. This, in turn, would increase the not only the cost of buying, but also installation cost, maintenance cost, and more space requirement. Since the mechanical properties of stainless steels are much higher in comparison to alloy steel and carbon steel, a lower rated flange would prove to be useful in many situations. This, however, would be dependent on the stainless steel alloy chosen for the application.
Click to view difference between common grades of SS Flanges here http://www.wermac.org/materials/304vs316.html