Quick Details
- Size: 4” (DN86)
- Material: F51 (2205/UNS S31803/UNS S32205)
- Place of Origin: cangzhou, China (Mainland)
- Brand Name: wilson pipeline
- Standard or Nonstandard: Standard
- Technics: Forged
- Standard: API 6A
- Type: F51 RTJ Spectacle Blind Flange
Packaging & Delivery
| Packaging Details: | Seaworthy plywood case or as customer requests |
|---|---|
| Delivery Detail: | 2 – 10 days after receiving the deposit |
Specifications
API 6A F51 RTJ Spectacle Blind Flange 3-1/8 Inch 5000PSI
1. Material: F51 (2205/UNS S31803/UNS S32205)
Spectacle blind flange, is made by a steel spade and spacer, united by a welded handle. Spectacle blind may have a different type of joint face (RR Raised Face, FF Flat Face, RTJ Ring Joint), depending the type of flange.
The rtj spectacle blind flange is usually used on the oil line with two different function:
If the spade is put in between the flanges, it stops the fluid’s passage;
If the spacer is put in between the flanges, the passage of the fluid is allowed.
The rtj spectacle blind flange is inserted between two flanges: in order to guarantee a perfect waterlight two gaskets are normally mounted, one on each side of rtj spectacle blind flange.
China Spectacle Blind Manufacturer wilson pipeline supplies API 6A F51 RTJ Spectacle Blind Flange, 3-1/8 Inch, 5000PSI.
Composition ranges for 2205 (F51) grade stainless steels
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
|
|
2205 (S31803) |
Min Max |
– 0.030 |
– 2.00 |
– 1.00 |
– 0.030 |
– 0.020 |
21.0 23.0 |
2.5 3.5 |
4.5 6.5 |
0.08 0.20 |
|
2205 (S32205) |
Min Max |
– 0.030 |
– 2.00 |
– 1.00 |
– 0.030 |
– 0.020 |
22.0 23.0 |
3.0 3.5 |
4.5 6.5 |
0.14 0.20 |
| Type | F51 RTJ Spectacle Blind Flange |
| Size | 4″ (DN100) |
| Standards | SO, WN, SW, TH, LJ, BL, PL, etc |
| Material | Carbon Steel: ASTM SA105N/A105, ASTM SA350 LF2,etc
Stainless Steel: ASTM A182 F304/304L/316/316L, etc Alloy Steel: ASTM A182 F1/F5/F9/F11/F22/F91, Etc. Duplex stainless steel: ASTM A182 F51, etc Super Duplex Stainless Steel: S32750/2507/F53/F55, UNS32760, etc Nicke alloys: Nickel 200, Monel 400, Inconel 600/625, Incoloy 825/800, Hastelloy C276, Hastelloy C276, Hastelloy B1/B2/B3, Alloy 20, etc Cu-Ni: 90/10,70/30, etc |
| Applications | Petroleum,chemical,power,gas,metallurgy, shipbuilding, construction, etc |
A spectacle blind flange is machined from a single piece of metal that is cut to match the pipe size, fit between two pipe flanges and requires an additional gasket when it is installed. Also, the bolts will need to be lengthened depending on what piping class and size blind is used. The thickness of the spectacle blind is specified based on the line pressure and pipe size.
API and ASME/ANSI flanges – comparing dimensions and pressure ratings
Although the dimensions of ASME and API flanges may sometimes be compatible for bolting – using the same bolt circle and the same number of bolts – they do not share the same pressure rating system.
ASME rates the pressure of a class based on the material of construction and the design temperature
API specifies allowable materials and gives it a specific pressure rating
The difference between ASME/ANSI and API is the fabrication material and a higher rated API operating pressure.
ASME/ANSI flanges are commonly used in industrial process systems handling water, steam, air and gas. API flanges are manufactured for high strength operating refinery systems with products such as oil and explosive gases.
The flange standards API 6A and ASME/ANSI B16.5 have the same dimensions – but the API 6A flanges are rated for higher pressures as indicated below:
| API vs. ASME/ANSI Flanges with the same Dimensions | ||||
|---|---|---|---|---|
| Flange | Pressure Class Rating (psi) (kPa) |
Nominal Size Range (inches) |
||
| ASME/ANSI B16.5 | API 6A | ASME/ANSI B16.5 | API 6A1) | |
| Weld neck | 600 | 2000 | 1/2 – 24 | 113/16 – 11 |
| 900 | 3000 | |||
| 1500 | 5000 | |||
| Blind and Threaded | 600 | 2000 | 113/16 – 211/4 | |
| 900 | 3000 | 113/16 – 203/4 | ||
| 1500 | 5000 | 113/16 – 11 | ||
1) In the old API standard, flanges ranged from 1 1/2 to 10(20) inches.
- 1 inch = 25.4 mm
Applications Of API 6A F51 RTJ Spectacle Blind Flange:
1. petrochemical industry
2. Pharmaceutical industry
3. Food industry
4. Aviation and aerospace industry
5. Architectural decoration industry
6. Oil and gas industry
Other Features:
1) Chemical and Physical characteristic: durable, corrosion resistant and high-temperature resistant
2) We also produce flange with special specifications according to customers’ requirements;
Packing
1) Packing Method:
Normal packing: Plastic film or bubble paper wrapped, endings protect by caps,
then into wooden case or load on fumigation plywood pallet.
Custom product: As per your request.
2) Shipping:
By Sea, By Air, By Train or River-and-Sea Coordinated Transport, according to your request.
Where can we find the high quality API 6A F51 RTJ Spectacle Blind Flange 3-1/8 Inch 5000PSI.
English 
