| Customization: | Available |
|---|---|
| Standard: | ANSI, DIN, GB, JIS, GOST, BSW, BS |
| Type: | Forged/ Hot Press |
|
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| Name | Gost 12821-80 Standard 304 Welded Neck DN15 DN1000 Flanges |
| Material Available | Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex Steel, Nickel Alloy, Monel, Inconel, Hastelloy, Copper Nickel, Titanium, Mild Steel, etc. |
| Custom design | As per your drawing |
| Size range | 1/2" (15 NB) to 48" (1200NB) DN10~DN5000 |
| Pressure Rating | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS |
| Types | Threaded, Plate, Screwed, Forged. |
| Supporting material | Gasket, Ring Joint, Flange Bolts |
| Production technique | Forged, machined and Heat treated |
| Pressure Class | PN 6 TO PN 100 |
| Coating/Surface Treatment: | Zinc Plated, Anti-rust Paint, Oil Black Paint, Yellow Transparent, Cold and Hot Dip Galvanized. |
| Origin | Shanghai China |
| European/African/Russian Standard Flanges | Available |
| Test | Direct-reading Spectrograph, X-ray detector, UItrasonic flaw detector, Magnetic particle detector, Hydrostatic testing machine, etc. |
| Gaskets Types | Full Face, Metallic Ring, Flat Ring Gasket |
| Marking Standard | Name of Manufacturer |
| Schedule | |
| Type of Flange Facing | |
| Pressure Class | |
| Nominal Pipe Size, etc |
| GOST 12821-80, 12821-80 WELD NECK FLANGES | |||||||
|
Weld Neck
|
DN15-DN1000 | DN15-DN1000 | DN15-DN1000 | DN15-DN1000 | DN15-DN800 | DN15-DN600 | DN15-DN500 |
Flantsy flat steel welded to the connecting protrusion according to GOST 12820-80
Material required for flanges and flanged fittings commonly are:
The pressure-temperature rating is the maximum allowable working pressure (bar unit) of the material and grade used at the rated temperature (Celsius).
Whether flange joints are used at high or low temperatures, leakage due to external forces and moments generated by the connected piping or equipment should be considered. To prevent leakage, pipe flanges and flanged fittings should avoid the application of severe external loads and sharp thermal gradients.
Application at temperatures in the creep range will result in decreasing bolt loads as relaxation of flanges, bolts, and gaskets takes place. Flanged joints subjected to thermal gradients may likewise be subject to decreasing bolt loads. Decreased bolt loads diminish the capacity of the flanged joint to sustain loads effectively without leakage. At temperatures above 200°C (400°F) for Class 150 and above 400°C (750°F) for other class designations, flanged joints may develop leakage problems unless care is taken to avoid imposing severe external loads, severe thermal gradients, or both.
Some materials, especially some carbon steel materials, exhibit a significant decrease in ductility when used at low temperatures, and thus cannot withstand impact load, sudden stress changes, and high stress concentrations. Some regulations require an impact test even when the temperature is above -29 °C (−20°F).
No pressure test is required on the flange.
Flanged fitting should be tested for shell pressure.
Shell Pressure Test for Flanged Fittings
The shell pressure test for flanged fittings shall be at a pressure no less than 1.5 times the 38°C (100°F) pressure rating rounded off to the next higher 1 bar (25 psi) increment.
|
Flanged Fittings Size |
Duration, Sec |
|---|---|
|
NPS ≤ 2 |
60 |
|
2 1/2 ≤ NPS ≤ 8 |
120 |
|
NPS ≥ 10 |
180 |
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