Slip-On Flange – ASME B16.5 NPS 1/2-24 Class 150-2500

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Slip-On Flange

Product Description

Slips over the pipe and is welded both inside and outside. Lower cost and easier alignment than Weld Neck, ideal for low-pressure and non-critical services.

Every flange is supplied with a mill test certificate (EN 10204 3.1), material traceability, and optional third-party inspection (BV / SGS / TUV). Available in Raised Face, Flat Face, and Ring Type Joint configurations per ASME B16.5.

Applications

Slip-on flanges are the workhorse of low-to-medium pressure piping systems where cost efficiency and rapid field installation matter more than fatigue resistance. They are extensively used in water treatment plants, HVAC chilled and hot water systems, fire protection piping, and general utility air lines operating at Class 150 to Class 300 pressure ratings (20 to 50 bar at ambient temperature).

Common industrial applications include cooling water networks, compressed air systems, lubrication oil piping, tank farm manifold connections, and shipyard utility lines. In these services, the slip-on design allows easy alignment with the pipe before fillet welding on both the bore and outer hub, cutting installation time by roughly 30% compared to weld neck flanges.

They are also specified in non-critical process skids, pump station bypass lines, and fire water distribution mains. Carbon steel A105 units handle media from -29°C to 425°C; stainless F304/F316 units extend service to corrosive chemical feed lines and food-grade process water.

Quality Assurance & Certification

All slip-on flanges are produced under our ISO 9001 quality system with EN 10204 3.1 material certificates documenting heat chemistry, tensile strength, and hardness. Each flange is fully traceable via heat number marking, and dimensional checks confirm bolt circle diameter, bore clearance, and face roughness per ASME B16.5 Section 6.

Optional NDT includes ultrasonic thickness verification, magnetic particle inspection for carbon steel surface defects, and dye penetrant testing on stainless material. Third-party inspection by SGS, BV, or TUV is available upon request, with witness points at dimensional check and final packing stages.

Export packaging includes VCI corrosion inhibitor wrapping for carbon steel flanges, plastic face protectors on raised faces, and sturdy plywood crates for ocean freight. Each bundle is tagged with flange size, class, material grade, heat number, and quantity to streamline receiving and inventory control.

ASME Standard Data

Dimensional, pressure–temperature and material data transcribed from the ASME B16.5-2025 standard (NPS 1/2–24, Metric/Inch). Ratings shown for carbon steel Group 1.1 (ASTM A105) and stainless Groups 2.1–2.3 (A182 F304/F316 family).

1. Pressure–Temperature Ratings — Group 1.1 Materials (A105) — SI Units (bar)

Source: ASME B16.5-2025, Table 2-1.1 (SI Units). Notes: (1) Prolonged use above 427°C permissible but not recommended; (2) only killed steel above 455°C; (3) not over 260°C; (4) not over 371°C; (5) not over 343°C; (6) see para. 2.5.3 for minimum temperatures.

2. Pressure–Temperature Ratings — Group 1.1 Materials (A105) — U.S. Customary Units (psig)

Source: ASME B16.5-2025, Table 2-1.1C (U.S. Customary Units). SI and US tables are independently rounded per ASME practice.

3. Material Group Correspondence (ASME B16.5, Table 1.1-1)

Source: ASME B16.5-2025, Table 1.1-1 (Material Groups). “…” denotes not applicable in the standard.

4. Minimum Use Temperatures (ASME B16.5, Appendix G, Table G-1)

Source: ASME B16.5-2025, Nonmandatory Appendix G, Table G-1 (Example Minimum Use Temperatures). Impact testing requirements per applicable code.

5. Slip-On Flange Dimensions — Class 150, SI Units (mm, ASME B16.5 Table 9)

Source: ASME B16.5-2025, Table 9 (Class 150, SI). Class 300/400/600/900/1500/2500 dimensions also per Table 9. Full column set (incl. hub X and A_h) per standard.

Frequently Asked Questions