Plate Slip-On Flange Manufacturer | PN16 | 304 / Q235B | Cost-Effective Piping Connection

As a professional flange manufacturer, SUNHY supplies high-quality Plate Slip-On Flanges (SO Flanges) designed for PN0.25–PN2.5 low- and medium-pressure piping systems.
With simple structure, easy welding, and reliable sealing performance, it is the most economical flange type for water, HVAC, and general industrial applications.

Key Advantages

• 💰 Low Cost – Efficient material utilization and simplified manufacturing reduce overall project cost.

• 🔧 Easy Installation – No bevel preparation required; double fillet welding ensures fast assembly and secure joints.

• 🧱 Wide Applicability – Suitable for water, oil, gas, and general utility systems in low-pressure environments.

Technical Summary

Applications

Water Supply Systems | HVAC | Chemical & Petrochemical Lines | Equipment Connections

Engineering Insight: Plate Slip-On Flanges in Low-Pressure Piping Design

In piping system design, the Plate Slip-On Flange is widely adopted for its economy and simplicity, especially in low-pressure ranges (PN0.25–PN2.5).
This section explores its engineering performance compared with Socket Weld (SO) and Weld Neck (WN) flanges.

1. Comparison: Plate Slip-On vs. Weld Neck Flange

Summary:
Plate Slip-On Flanges provide a cost-effective solution for general industrial and low-pressure pipelines, while Weld Neck Flanges are preferred for high-stress environments.

2. Manufacturing & Sealing Technology

SUNHY adopts a forged production process to ensure high material density and mechanical strength.
Flange sealing faces are precision-machined and available in Raised Face (RF), Male/Female (M/F), and Ring Type Joint (RTJ) configurations.
This enhances sealing performance and ensures long service life even under thermal cycling or vibration.

3. Installation Guidelines

1. Insert the pipe into the flange bore to about two-thirds of its depth.

2. Perform double-side fillet welding with continuous, even weld seams.

3. Ensure both flange faces remain parallel during installation to avoid sealing misalignment.

4. Tighten bolts in a cross pattern to achieve uniform gasket compression and leak-free performance.