ASTM A182 Slip On Flange

A flange can be described as a method of connecting pipes. ASTM A182 slip on flange is mainly used for low-pressure fluids that have minimal risk of leakage. Stainless Steel Slip On Flange is commonly used in water lines, low-pressure compressed airlines, etc. The ASME B16.5 Slip On Flange is a standard trusted by different industries for quality and safety. These standard flanges are used in various industries like oil and gas, petrochemical, firefighting water lines, etc.

Specification of ASME B16.5 Flange

Manufacturing Process:

The flanges covered by ASTM A182 are typically produced by forging or rolling methods. This ensures that the material’s mechanical properties are optimized for the intended service conditions.

Pressure and Temperature Ratings:

ASTM A182 Stainless Steel Flanges are designed to meet specific and temperature requirements. The standard provides various classes (Class 150, Class 300, Class 600, etc.) to indicate the pressure-temperature rating of the flanges.

Types of Flanges:

The standard covers various types of flanges, including weld neck, slip-on, socket weld, lap joint, threaded, and blind flanges. Each type has its own characteristics and applications.

Testing and Quality Control:

The specification outlines the testing procedures and quality control measures to ensure that the flanges meet the required standards. Common tests include chemical composition analysis, mechanical testing, and non-destructive testing methods.

Key Features:

Simple Installation – The pipe slides into the flange before welding, making it easier to align.
Double Welding – Requires both inside and outside welds to ensure a secure connection.
Cost-Effective – Less material and labor required compared to weld neck flanges.
Lower Strength Compared to Weld Neck – Not suitable for high-pressure or high-temperature applications.
Available in Various Sizes & Pressure Ratings – Widely used in low to moderate pressure systems.

Dimensions of Class 150 ASTM A182 Slip On Flange

A182 Stainless Steel Flanges Working Pressure Classs

(Max working pressure of Stainless steel flanges ASTM A182 – by Class, in bar).

Comparison between blind flange and slip on flange

1.Design & Structure

Blind Flange:

Has no bore or opening in the center.

Flat face or raised face can be used, but no internal pipe connection.

A solid, flat disc designed to close off the end of the pipe.

Slip-On Flange:

Has a central bore that is slightly larger than the outer diameter of the pipe, allowing the flange to slip over the pipe.

Requires welding both inside and outside of the flange to secure it to the pipe.

2. Installation

Blind Flange:

No welding to pipe—it is bolted to the system to close the end off.

Commonly used for closing off ends of pipelines or vessels during maintenance or when the pipe is not in service.

Slip-On Flange:

Slides onto the pipe before welding.

Requires two welds (inside and outside) to create a secure connection.

3. Application

Blind Flange:

Used for pipe termination, to cap the end of the pipe in a system.

Often used in valve manifolds, pumps, and vessel closures.

Common in high-pressure or maintenance shutdown systems.

Slip-On Flange:

Primarily used in low- to medium-pressure systems.

Typically found in chemical, water, oil, and HVAC systems.

Ideal for applications where frequent assembly/disassembly isn’t needed.

4. Pressure & Strength

Blind Flange:

Higher pressure rating—typically used for high-pressure systems.

Designed to withstand internal and external pressure without leakage.

Slip-On Flange:

Lower pressure rating compared to other flange types like weld neck flanges.

Not suited for very high-pressure systems, especially at elevated temperatures.

5. Cost & Complexity

Blind Flange:

Generally more expensive due to the larger size and design complexity.

Can be heavier due to its solid structure.

Slip-On Flange:

Less expensive and simpler to install, making it a cost-effective solution for many low-pressure applications.

Lighter than blind flanges due to the absence of a solid disc.

Applications:

Low-Pressure Piping Systems – Common in water, air, gas, and low-pressure steam lines.
Chemical & Petrochemical Plants – Used in mildly corrosive environments.
Oil & Gas Pipelines – Used in non-critical applications.
HVAC & Fire Protection Systems – Ideal for moderate-temperature piping networks.