PLSteel Pipe FlangesPlate Flange (PL)
Flat-type flange with simple structure, light weight and low cost — ideal for low-pressure pipeline systems.
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Slip-On Flange (SO)
Sleeve-type flange slipped over the pipe and fixed by fillet welding — economical for medium and low pressure systems.
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SOSteel Pipe Flanges
Overview
Slip On Flange (SO) is a widely used flange type with a sleeve structure, which is sleeved on the pipe and fixed by fillet welding. It has the advantages of simple structure, easy alignment, low cost and convenient installation, and is suitable for medium and low pressure pipeline systems. As a versatile flange type, it is widely used in various industrial and civil pipeline systems.
Size Range
½" – 80"
Pressure Class
Class 150 – 600 / PN10 – PN40
Key Features
- Easy installation and pipe alignment
- Cost-effective vs weld neck for medium/low pressure
- Precision-machined sealing surface with gasket
- RF, FF and MFM facing options
- Carbon, stainless and alloy grades available
Benefits
- Lower cost than weld neck flanges
- Simple alignment during field installation
- Wide compatibility with common pipeline media
Specifications
| Standards | GB/T 9116, ASME B16.5, EN 1092-1, DIN 2501, JIS B2220 |
| Pressure Ratings | Class 150, 300, 600 / PN10 – PN40 |
| Nominal Diameter | DN15 – DN2000 (NPS ½" – 80") |
| Working Temperature | -40°C – 450°C |
| Connection | Fillet weld to pipe OD |
Applications
Petrochemical (low and medium pressure)Natural gas distribution (low pressure)Water supply and drainageHVAC and general chemical processingFood and beverage industries
Product Enquiry
Standards
- • ISO 7005
- • ASME B16.5
- • EN 1092-1
- • DIN 2501
- • JIS B2220
- • GB/T 9115–9119
- • HG/T 20592
Materials
- • Carbon Steel: A105, 20#, Q235B, A234 WPB
- • Stainless Steel: 304, 304L, 316, 316L, 321
- • Alloy Steel: 16Mn, F11, F22, 15CrMo
- • Duplex & Super Duplex: F51, F53, 2205
- • Special alloys: Monel, Hastelloy, Titanium (on request)
Related Products
PLSteel Pipe Flanges
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Loose flange with stub end — convenient disassembly for large-diameter, low and medium pressure systems.
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WNSteel Pipe FlangesWelding Neck Flange (WN)
High-pressure flange with tapered neck and butt-weld connection — the standard for critical HPHT service.
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