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KuitunFlat flange
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Product Description
Flat-Plate Flange (PL) – Flat Face Seal, Full Bore, Forged as a Single Piece
A flat flange (PL flange, or simply a flat flange) is a flat, circular forged component featuring a central bore and a ring of bolt holes. When it is slipped over a pipe and welded on both sides, the pipe is sealed—without the need for a raised face or a neck.
Note: A slip-on flange has a hole for connecting to piping; a blind flange (BL) has no hole and is used to block fluid flow—select PL for connection and BL for isolation.
Our standard range
Nominal size
NPS ½ – 48 (DN 15 – DN 2000)
Pressure rating
150–2,500 pounds (PN 6–PN 400)
Sealing surface
RF, FF, RTJ
Materials
A105, LF2, F304, F316L, F51 duplex stainless steel, and others.
Why do operators choose flat flanges?
Overall Forging—Ultrasonic Testing Grade C/Pass, with no recordable defects larger than 2 mm.
Same pressure class—compliant with ASME B16.5 and B16.47 standards, up to 2,500 psi.
Flat—gasket is evenly compressed, no need to preheat the hub.
High cost performance—weighs 20%–30% less than welded-neck flanges, with bolt-hole centers aligned.
Easy to install—slides in from either side for quick alignment in a compact rack.
Typical Services
Cooling water ring network
Lubricant manifold inside the package
Low-temperature transport pipeline (-196°C, 304L short section)
Food-grade process piping (polished RF, Ra ≤ 0.8 µm)
Onboard Instrument Air System
Quick Selection Guide
| Medium | Level | Materials | face |
|
Cooling water |
150 |
A105 |
RF |
|
Seawater |
300 |
F316L |
FF |
|
Sulfuric acid |
150 |
F51 |
RF |
|
Liquefied natural gas |
300 |
F304L |
RF |
| Instrument air |
150 |
A105 |
FF |
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Telephone
Mobile phone
Address
Jiulongwan Industrial Zone, Shacun Village, Dingxiang County, Xinzhou City, Shanxi Province
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