Slip-on flanges are one of the most widely used and easiest to install flange types in piping systems. They can be directly slipped onto pipe ends and fillet welded, requiring no precise alignment and offering high construction efficiency. The nickel alloy slip-on flanges supplied by Hefei Tailan Metal Co., Ltd. are manufactured from high-quality nickel-based alloy forgings or plates through multiple precision processes including forging/cutting, solution heat treatment, machining, drilling, and pickling/polishing. Featuring convenient installation, economical cost, reliable sealing, and excellent corrosion resistance, they are specifically designed for pipe connections in medium pressure, corrosive service conditions.
Difference from Welding Neck Flanges:
Slip-On Flange: Slips onto pipe end, fillet welded inside and outside, suitable for medium pressure
Welding Neck Flange: Butt welded to pipe, tapered hub transition, suitable for high pressure, demanding conditions
Supply Range
Nominal Diameter (DN/NPS): DN15 – DN600 (1/2 inch – 24 inches); Larger diameters negotiable
Pressure Class: Class 150, 300, 600, 900, 1500 (ASME)
Facing Type: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)
Flange Type: Slip-On Flange, Plate Flange
Bore Diameter (B): 1-3mm larger than pipe OD for easy slipping
Hub Diameter (X): Related to flange OD and pressure class
Machining Precision: Sealing surface roughness Ra 3.2μm – 6.3μm (as per standard requirements)
Surface Condition: Machined, Pickled, Polished optional
Marking Method: Steel stamp marking on flange outer edge, conforming to MSS SP-25 or customer requirements
Strict Non-Destructive Testing
Penetrant Testing (PT) : Detecting surface-opening defects, conforming to ASTM E165 standard
Hardness Testing: Verifying heat treatment effectiveness and mechanical property uniformity
Multiple Facing Types Available
Various facing types available according to service conditions:
Raised Face (RF) : Most common, suitable for Class 150-1500
Ring Type Joint (RTJ) : For high pressure, strict leakage prevention
Flat Face (FF) : For cast iron flanges or low pressure conditions
Stock Availability, Emergency Response
We maintain inventory of slip-on flange blanks for mainstream grades such as Inconel 600/625, Monel 400, and Hastelloy C-276. Orders can be quickly arranged for machining.
