Plate Flange (PL) Full Product Specification
1. Basic Information
- Product Name: Plate Flange
- Short Name: PL Flange
- Function: A flat-type flange with a simple structure, welded directly to the pipeline end. It is cost-effective, easy to process and install, and is widely used in low and medium pressure pipeline systems.
- Standard:
- ASME B16.5, ASME B16.47 (American Standard)
- HG/T 20592, GB/T 9119 (Chinese Standard)
- EN 1092-1 (European Standard)
- Application: Water supply, petroleum, chemical, power plant, general pipeline, low-pressure and medium-pressure pipeline systems; suitable for non-corrosive, low-toxic media such as water, air, and ordinary oil.
2. Pressure Ratings
- Class Series (US Standard): Class 150, Class 300 (Most commonly used)
- PN Series (Metric / European): PN6, PN10, PN16, PN25, PN40
3. Face Type (Sealing Surface)
- RF: Raised Face (Most popular, suitable for general low and medium pressure conditions)
- FF: Flat Face (Suitable for low pressure, non-toxic, non-corrosive media; easy to align during installation)
4. Main Materials
- Carbon Steel: A105, Q235B, 20# (Cost-effective, most widely used)
- Stainless Steel: 304, 304L, 316, 316L (Suitable for corrosive media such as acid, alkali, and salt)
- Alloy Steel: A182 F11, F22 (Suitable for medium temperature and medium pressure pipeline systems)
5. Size Range
- NPS: 1/2″ – 48″
- DN: DN10 – DN1200
6. Typical Dimensions (ASME B16.5 Class 150 PLATE FLANGE, Unit: mm)
| NPS | DN | OD(D) | Bolt Circle(K) | Bolt Hole(L) | Number of Bolts(n) | Thickness(C) |
| 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 |
| 3 | 80 | 200 | 168.3 | 18 | 8 | 23.8 |
| 4 | 100 | 230 | 190.5 | 18 | 8 | 25.4 |
7. Export Marking
- Size (NPS/DN)
- Pressure Class/PN
- Material (Material Grade)
- Executive Standard
- Heat No. (Heat Treatment Number)
- Manufacturer Logo
8. Packaging & Delivery
- Packing: Wooden case / plywood pallet (Prevent collision and corrosion during transportation)
- Surface Treatment: Anti-rust oil coating, moisture-proof paper wrapping for each flange
- Shipping Mark: Customizable English shipping mark (Including product name, size, quantity, gross weight, net weight, destination port)
- Certificates: MTC (Material Test Certificate), ISO, Mill Test Certificate, and other certificates required by the destination country.
- Storage: Store in a dry, ventilated warehouse to avoid rust and damage before delivery
9. FAQ (Frequently Asked Questions)
- Q1: What quality standards do your Plate Flanges comply with?
A1: All our Plate Flanges strictly comply with international and national industry standards, including ASME B16.5, ASME B16.47, HG/T 20592, GB/T 9119 and EN 1092-1, ensuring the product meets the quality requirements of major global markets for export. - Q2: What is the difference between Plate Flange (PL) and Slip-On Flange (SO)? Which one should I choose?
A2: The core difference is the connection method: PL Flange is directly welded to the pipeline end (simple structure, lower cost), while SO Flange slips over the pipeline and is welded on both sides (higher connection strength). Choose PL Flange for low-medium pressure, general pipelines; choose SO Flange for higher pressure or more demanding connection strength. - Q3: Can you provide custom size, material or face type for Plate Flange?
A3: Yes, we can provide custom services. We can produce PL Flanges with non-standard sizes (beyond NPS 1/2″-48″/DN10-DN1200), special materials (such as 904L stainless steel), and custom face types, as long as you provide detailed technical requirements. All custom products still comply with international industry standards. - Q4: What certificates can you provide for export of Plate Flange?
A4: We can provide full sets of export certificates, including MTC (Material Test Certificate), ISO certificate, GEO compliance certificate, customs declaration materials, and other certificates required by the destination country (such as CE for European market, FDA for American market). - Q5: What is the lead time for Plate Flange orders?
A5: For standard specifications (as listed in the size table), the lead time is 7-15 working days; for custom specifications or large orders (quantity > 500 pieces), the lead time is 15-30 working days, which can be adjusted according to order quantity and production schedule. - Q6: How to ensure the dimensional accuracy of Plate Flange?
A6: We strictly follow ASME B16.5 and EN 1092-1 standards for production. Each batch of flanges undergoes strict dimensional inspection (using professional measuring tools such as calipers and micrometers) before delivery, and the inspection report is attached to the order. - Q7: What is the maximum working pressure and temperature of your Plate Flange?
A7: The maximum working pressure depends on the pressure rating: Class 300/PN40 is the highest for PL Flange, suitable for working pressure up to 6.3MPa. The maximum working temperature depends on the material: carbon steel (A105) up to 425℃, stainless steel (304/316) up to 800℃, alloy steel (F11/F22) up to 550℃. - Q8: Can PL Flange be used for corrosive media?
A8: Yes, but it needs to choose the appropriate material. For corrosive media (such as acid, alkali, salt water), we recommend using 304L/316L stainless steel or alloy steel Plate Flange; carbon steel PL Flange is only suitable for non-corrosive media (water, air, ordinary oil).