JIS B2220 SOP Type Flanges

Overview

Slip-On Plate Flange is a flat plate–type flange designed to slide over the pipe and be welded on both the inside and outside. It combines the cost efficiency of plate flanges with the ease of alignment of slip-on connections, making it a popular choice for waterworks, fire protection, HVAC, and general industrial piping systems.

Manufactured from carbon steel or stainless steel plate, Slip-On Plate Flanges are widely used in low to medium pressure applications where installation convenience, dimensional flexibility, and economic efficiency are required.

Product Description

Slip-On Plate Flanges are produced by cutting and machining steel plates, with accurately drilled bolt holes and a smooth bore that allows the pipe to slide into position before welding.
After installation, fillet welds are applied on both the inside and outside, ensuring a secure and leak-tight joint.

These flanges are commonly supplied in accordance with EN, BS, SANS, JIS, and ANSI standards, and are available in various pressure ratings such as PN10 / PN16 or Class 150, depending on project requirements.

Typical specifications:

• Type: Slip-On Plate Flange (SOP)

• Size range: DN15 – DN600 (custom sizes available)

• Pressure rating: PN10 / PN16 / Class 150

• Materials: Carbon Steel, Stainless Steel

• Facing: FF (Flat Face) or RF (Raised Face)

Flange production process

Factory Showcase

FAQ

Q1: What is the difference between Slip-On Plate Flange and PL Flange?

Slip-On Plate Flange is designed for pipe insertion and welding, while a PL (Plate) Flange is typically welded directly to the pipe end without insertion. Slip-On Plate Flanges offer better alignment and easier installation.

Q2: Is Slip-On Plate Flange suitable for high-pressure systems?

Slip-On Plate Flanges are mainly recommended for low to medium pressure applications. For high-pressure or high-temperature services, Weld Neck Flanges are generally preferred.

Q3: What welding method is used?

Normally, double fillet welding is applied:

• One weld on the inside

• One weld on the outside
  This improves strength and leak resistance.

Q4: What standards are commonly used?

Common standards include:

• EN 1092-1

• BS / SANS 1123

• JIS B2220

• ANSI / ASME

The exact standard and drilling pattern must be confirmed before production.

Q5: Can Slip-On Plate Flanges be supplied with FF or RF facing?

Yes. Flat Face (FF) and Raised Face (RF) are both available, depending on gasket type and system design.

Q6: What are the typical applications?

• Water supply pipelines

• Fire protection systems

• HVAC systems

• General industrial and utility piping