Blind Flange – Industrial Flange Manufacturer & Supplier
Product Overview
Blind flanges are solid flanges used to close pipeline ends or pressure vessel openings.
Key Applications
Oil & Gas pipelines
Petrochemical plants
Power generation systems
Water treatment facilities
Industrial pressure piping
Common Materials
Carbon Steel: ASTM A105, A350 LF2
Stainless Steel: ASTM A182 F304, F316
Alloy Steel: ASTM A182 F11, F22
Pressure Ratings
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500
Face Types
RF – Raised Face
FF – Flat Face
RTJ – Ring Type Joint
FAQ
Q: What is this flange used for?
A: It is widely used in industrial piping systems including oil & gas, chemical plants, and power plants.
Q: Which standards apply to this flange?
A: Common standards include ASME B16.5, ASME B16.47, EN 1092-1 and GB/T flange standards.
Q: Which materials are available?
A: Typical materials include carbon steel, stainless steel, and alloy steel grades.
Q: Where can I buy industrial flanges?
A: Industrial flanges can be supplied by forged flange manufacturers and flange suppliers worldwide.
Blind Flange (BL) Full Specification
1. Basic Information
- Product Name: Blind Flange
- Short Name: BL Flange
- Function: Used to seal the end of pipelines, prevent media leakage, and facilitate maintenance and inspection of pipeline systems
- Standard:
- ASME B16.5, ASME B16.47
- GB/T 9115, HG/T 20592, HG/T 20615
- EN 1092-1
- Application: Oil & gas, petrochemical, pipeline, power plant, water treatment and other industrial fields
2. Pressure Ratings
- Class Series (US Standard): Class 150, 300, 600, 900, 1500, 2500
- PN Series (Metric / European): PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160
3. Face Type (Sealing Surface)
- RF: Raised Face (Most Commonly Used)
- FF: Flat Face
- RTJ / RJ: Ring Type Joint (For High Pressure / High Temperature)
- M/F: Male / Female
- T/G: Tongue / Groove
4. Main Materials
- Carbon Steel: A105, A234 WPB, Q235B, 20#, 16Mn
- Stainless Steel: 304/L, 316/L, 321, 904L
- Alloy Steel: A182 F11, F22, F5, F9, F91
5. Nominal Size Range
- NPS: 1/2″ – 48″
- DN: DN10 – DN1200
6. Key Dimensions
6.1 ASME B16.5 BL RF – Class 150
| NPS | DN | OD (D) | K | L | n | C (Thickness) |
| 1/2 | 15 | 95 | 66.7 | 16 | 4 | 11.1 |
| 3/4 | 20 | 115 | 82.6 | 16 | 4 | 12.7 |
| 1 | 25 | 125 | 88.9 | 16 | 4 | 14.3 |
| 1.5 | 40 | 155 | 114.3 | 18 | 4 | 17.5 |
| 2 | 50 | 165 | 127.0 | 18 | 4 | 19.0 |
6.2 HG/T 20592 BL RF – PN16
| DN | OD (D) | K | L | n | C (Thickness) |
| 15 | 95 | 65 | 14 | 4 | 16 |
| 20 | 105 | 75 | 14 | 4 | 18 |
| 25 | 115 | 85 | 14 | 4 | 18 |
| 40 | 150 | 110 | 18 | 4 | 18 |
| 50 | 165 | 125 | 18 | 4 | 20 |
7. Marking (Standard Export Marking)
- Size (NPS / DN)
- Class / PN
- Material
- Standard
- Heat No.
- Manufacturer mark
8. Packaging & Delivery
- Packing: Wooden case / plywood pallet (prevent collision and corrosion)
- Marking: Shipping mark in English as required (including product name, size, quantity, etc.)
- Reminder: The flange should be stored in a dry and ventilated environment to avoid rust and damage before delivery.