Designed to meet rigorous industrial standards including ASME B16.5, DIN, and EN specifications, our Slip On Pipe Flanges are manufactured from high-grade carbon, stainless, or alloy steel. They provide reliable, detachable flanged joints for low-to-medium pressure fluid transport systems. Each flange features precision-machined bores and facing configurations (RF, FF, or RTJ) to ensure a leak-tight seal, backed by full material test reports (MTC 3.1) and custom pressure-class manufacturing.
Materials and Manufacturing
The material for a Slip-On (SO) flange should be selected based on the pipe material, service fluid, temperature, pressure, and environmental conditions.
Common material choices include:
Carbon Steel–suitable for general industrial and utility services.
Stainless Steel–recommended where corrosion resistance or specific fluid compatibility is essential.
Alloy Steel–used for applications requiring enhanced mechanical strength or high/low temperature performance.
Flanges are machined to the specified nominal size, bore diameter, bolting pattern, and facing type. Upon project requirements, material test certificates (e.g., EN 10204 3.1), dimensional inspection reports, and other quality documentation can be supplied.
Products Specifications
|
Product Type |
Slip On Pipe Flange (SO Flange) |
|
Nominal Size |
NPS 1/2" – 24" (DN15 – DN600) per ASME B16.5; larger sizes up to NPS 48" (DN1200) available per ASME B16.47 |
|
Pressure Rating |
ASME: Class 150, 300, 400, 600, 900, 1500, 2500; EN/DIN: PN6, PN10, PN16, PN25, PN40, PN64, PN100 |
|
Material |
Carbon Steel: ASTM A105 / A105N, ASTM A350 LF2/LF3; Stainless Steel: ASTM A182 F304/304L, F316/316L, F321, F310S, F347, F904L; Alloy Steel: ASTM A182 F11, F12, F5, F9, F91, F92; Duplex: ASTM A182 F51, F53, F44 |
|
Flange Facing |
RF (Raised Face) - most common; FF (Flat Face) - for flat-faced mating flanges; RTJ (Ring Type Joint) - for high-pressure/RTJ gasket systems |
|
Standard |
ASME B16.5 (NPS 1/2" – 24"); ASME B16.47 (NPS 26" – 60"); EN 1092-1; JIS B2220; DIN (e.g., DIN 2573, 2576, 2632, 2633) |
|
Bore |
Matched to pipe OD and schedule (e.g., SCH 10, SCH 40, SCH 80, SCH 160, XXS) |
|
Connection |
Slip-on with fillet welding - one weld outside + one inside (optional) |
|
Surface Treatment |
Carbon Steel: Anti-rust oil (standard), Hot-Dip Galvanizing, Epoxy coating, Zinc-rich paint; Stainless Steel: Pickling & Passivation, Natural finish, Mechanical polish |
|
Inspection |
Material Certificate: EN 10204 Type 3.1 (standard) or Type 3.2 (third-party verified); Inspection: Dimensional inspection, PMI (Positive Material Identification), Hydrostatic test, NDT (MT/PT/UT as required); Third Party: SGS, BV, TÜV, DNV available on request |
Flange Facing and Connection
The flange facing provides the sealing surface for the gasket between two bolted connections. Depending on the governing standard and piping design, Slip-On flanges are commonly available with Raised Face (RF) or Flat Face (FF) configurations.
During installation, the pipe is inserted through the flange bore and positioned to the required stand-off distance. Welding is then performed to secure the joint. All welding procedures, weld sizes, and inspection criteria must comply with the applicable project codes and welding specification.
When selecting a Slip-On flange, ensure that the flange bore matches the pipe O.D. (outside diameter) and that the flange is fully compatible with the mating flange, gasket, and bolting system.
Standards and Specifications
Slip On Pipe Flanges can be manufactured according to the standard required for the project. Depending on the customer's market and piping system, commonly specified flange standards may include ASME B16.5, EN 1092-1, JIS, DIN or other applicable specifications.
FAQ
Q: When should I choose a Slip On Flange over a Weld Neck Flange?
A: Choose Slip On Flanges (SO) for low-to-medium pressure applications (Class 150/300) where quick pipe alignment and cost-efficiency matter most. They cut initial component cost by 20–30% and reduce cutting time. However, for extreme high-pressure (Class 600+), thermal cycling, or critical toxic media, we recommend Weld Neck Flanges (WN) for their superior fatigue resistance.
Q: How do you guarantee the weld quality and fit tolerance of your Slip On Flanges?
A: All our SO flanges are precision-machined to ASME B16.5 standards, ensuring a strictly controlled inner bore (+1.5mm tolerance) for seamless pipe sleeve insertion. To prevent sealing face warping during installation, we provide detailed welding gap guidelines (1.16" / 1.5mm) and offer 100% Surface Penetrant Testing (PT) / Magnetic Particle Testing (MT) report upon request before shipping.
Q: Can one Slip On Flange fit pipes with different wall thicknesses (Schedules)?
A: Yes! Since SO flanges fit over the pipe's outer diameter (OD), one flange size compatible with standard nominal pipe sizes (NPS) can accommodate various wall thicknesses (e.g., Sch 40, Sch 80, Sch 160). If you are using non-standard, thin-wall (e.g., 5S/10S), or custom rolled pipes, simply send us your exact pipe OD-our engineering team can custom-bore flanges to tailor to your engineering situation.
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