Stainless Steel Plate Flange Product Overview

The SIYelectric Stainless Steel Plate Flange is a common pipe connection component used to join pipes, valves, fittings, vessels, tanks, and industrial equipment through a bolted flange connection.

A plate flange is usually a flat circular flange with a central bore and bolt holes around the outside. During installation, the pipe is inserted into or aligned with the flange bore and welded, while the flange face is connected to another flange using bolts, nuts, and a gasket.

This type of flange is widely used in low to medium pressure piping systems, especially where a simple, economical, and removable connection is required.

Product Description

A stainless steel plate flange provides a practical way to connect pipe sections or equipment interfaces in industrial systems. Compared with threaded connections, a flange connection is stronger and more suitable for larger pipe sizes. Compared with welded-only connections, a flanged connection can be removed more easily during maintenance or replacement.

In many projects, this product may also be called a PL flange, flat welding flange, or stainless steel pipe flange. It is commonly selected for water, air, oil, steam-related auxiliary lines, chemical media, and general industrial fluid systems.

For pressure instrumentation applications, plate flanges can be used together with pressure transmitters, diaphragm seal pressure transmitters, differential pressure level transmitters, flushing rings, PTFE gaskets, spiral wound gaskets, threaded flanges, and flanged pipe fittings. They help create a compatible process connection when the instrument or accessory needs to be mounted on a flanged interface.

Key Features

Flat Plate Flange Structure

The plate flange has a simple flat circular body with bolt holes and a central bore, making it easy to install and suitable for many standard piping systems.

Stainless Steel Construction

Available in stainless steel materials such as SS304, SS316, and SS316L, providing corrosion resistance and long service life in industrial environments.

Bolted Flange Connection

The flange is connected with bolts, nuts, and a gasket, allowing secure sealing and easier disassembly compared with permanent welded-only connections.

Suitable for Pipe and Equipment Connections

Used for connecting pipelines, valves, pumps, tanks, vessels, process equipment, and instrument assemblies.

Multiple Flange Standards

Can be supplied according to common standards such as ASME, EN, DIN, JIS, GB, or customized project drawings.

Compatible with Different Gaskets

Can be used with PTFE gaskets, spiral wound gaskets, rubber gaskets, graphite gaskets, or other sealing materials depending on the medium and working conditions.

Technical Specifications

Applications

Industrial Piping Systems

Used to connect pipe sections, fittings, valves, pumps, and process equipment in general industrial fluid systems.

Water Treatment Systems

Applied in filtration units, pumping stations, water distribution pipelines, dosing systems, wastewater treatment equipment, and desalination systems.

Chemical Processing

Suitable for chemical pipelines, storage tanks, reactors, process skids, and utility lines. For corrosive media, SS316 or SS316L is usually recommended after checking chemical compatibility.

HVAC and Building Services

Used in chilled water, hot water, cooling water, heating systems, and other building service pipelines.

Oil and Gas Auxiliary Systems

Suitable for fuel lines, utility pipelines, sampling systems, flushing lines, and auxiliary process connections where stainless steel flanged connections are required.

Pressure Instrumentation Connections

Can be used as a process connection accessory for flanged pressure transmitters, diaphragm seal systems, differential pressure level transmitters, flushing rings, and instrument flange assemblies.

Equipment and Tank Connections

Used on tanks, vessels, pumps, filters, heat exchangers, and other equipment where a removable flange connection is needed.

Advantages

• Simple and economical flange design for pipe and equipment connection.
• Stainless steel material provides corrosion resistance and durability.
• Bolted flange structure allows easier installation, inspection, and replacement.
• Suitable for low to medium pressure piping systems.
• Can be used with different sealing gaskets, including PTFE and spiral wound gaskets.
• Compatible with valves, pipelines, tanks, pumps, and pressure instruments.
• Custom size, material, pressure rating, and sealing face options are available.
• Useful for instrument flange connection and diaphragm seal installation.
• Suitable for chemical, water treatment, HVAC, utility, and industrial piping systems.

Selection Notes

When selecting a stainless steel plate flange, confirm the following details:

1. Flange standard
   Confirm whether the project requires ASME, EN, DIN, JIS, GB, or another standard.
2. Nominal size
   Confirm the pipe size or flange size, such as DN15, DN25, DN50, DN100, or customized dimensions.
3. Pressure rating
   Confirm the required pressure class, such as PN10, PN16, PN25, PN40, Class 150, or Class 300.
4. Material selection
   • SS304: suitable for water, air, oil, and mild industrial media.
   • SS316 / SS316L: better for chemical, coastal, corrosive, or more demanding service.
5. Sealing face type
   Confirm whether the flange face should be RF raised face, FF flat face, or another custom sealing face.
6. Gasket type
   Select PTFE gasket, spiral wound gasket, rubber gasket, or graphite gasket according to pressure, temperature, and medium.
7. Instrument application
   If used with a pressure transmitter, diaphragm seal, or flushing ring, confirm the diaphragm flange size, bolt holes, gasket size, and installation thickness.