Industrial Flanges

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ANSI Standard Flange Description

 

Overview:

An ANSI Standard Flange is a circular, bolted piping connector built to precise US dimensional and mechanical standards. It provides a standardized method for joining process piping, equipment, and valves, allowing for quick assembly, disassembly, cleaning, or line modification without cutting the pipes.

 

Core ANSI/ASME Specifications:

- ASME/ANSI B16.5: Covers pipe flanges and flanged fittings from NPS 1/2 through NPS 24 (Nominal Pipe Size).

- ASME/ANSI B16.47: Covers large-diameter steel flanges from NPS 26 through NPS 60 (Series A and Series B).

- ASME/ANSI B16.36: Covers orifice flanges used for flow measurement.

 

Pressure Classes (Pressure-Temperature Ratings):

ANSI flanges are categorized into standard pressure classes measured in "Class" (often referred to as # or lb):

- Class 150

- Class 300

- Class 600

- Class 900

- Class 1500

- Class 2500

Higher class ratings indicate thicker walls, larger bolt circles, and greater ability to withstand elevated operating pressures and temperatures.

 

Common Types of ANSI Flanges:

1. Weld Neck Flange (WN): Features a long tapered hub welded directly to the pipe; best for high-pressure, severe-stress conditions.

2. Slip-On Flange (SO): Slides over the end of the pipe and is welded inside and outside; cost-effective and easy to align.

3. Blind Flange (BL): Solid disc used to seal off pipeline ends or pressure vessel openings.

4. Threaded Flange (TH): Connects via NPT screw threads without welding; ideal for low-pressure or hazardous areas where welding is prohibited.

5. Socket Weld Flange (SW): Pipe inserts into a recessed socket and is fillet-welded; used for smaller diameter, high-pressure lines.

6. Lap Joint Flange (LJ): Used in conjunction with a stub-end fitting; allows easy alignment of bolt holes during installation.

 

Facing Types:

- Raised Face (RF): Standard 1/16 in or 1/4 in raised surface that focuses pressure on the gasket area.

- Flat Face (FF): Entire face is flat, preventing cracking when mating to cast-iron or brittle material flanges.

- Ring Type Joint (RTJ): Deep groove machined into the face for a metal ring gasket, used in extreme high-pressure/high-temperature environments.

 

Common Materials:

- Carbon Steel: ASTM A105 (Standard high-temperature carbon steel), A350 LF2 (Low-temperature).

- Stainless Steel: ASTM A182 F304/304L, F316/316L (Corrosion-resistant applications).

- Alloy Steel: ASTM A182 F11, F22, F91 (High-temperature power generation).

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Lap Joint Flange Description

 

Overview:

A Lap Joint Flange is a specialized two-piece flange assembly used in piping systems where frequent dismantling for inspection, cleaning, or maintenance is required. It consists of a loose backing flange that slides over the pipe and a separate short pipe section with a flared shoulder called a "stub end." The stub end is butt-welded directly to the pipe, while the backing flange remains free to rotate around the stub end to align bolt holes easily.

 

Key Components & Working Principle:

1. Stub End: A short pipe fitting welded directly to the line. Its flared face acts as the actual flange sealing face where the gasket rests.

2. Backing Flange: A ring flange with a curved radius at the center bore that rests against the back of the stub end shoulder. It exerts clamping pressure when bolted.

 

Core Advantages:

- Free Rotation: The flange ring can spin 360 degrees around the stub end, making bolt hole alignment effortless during installation.

- Cost Efficiency: For stainless steel or exotic alloy piping systems, only the stub end needs to be made of expensive corrosion-resistant material; the outer backing flange can be cheaper carbon steel.

- Non-Welded Ring: The backing flange is not welded to the pipe, allowing quick removal for cleaning or replacement without cutting welds.

 

Common Specifications:

- Standards: ASME B16.5, ASME B16.47, EN 1092-1, DIN 2642.

- Pressure Ratings: Standard ANSI Class 150 and Class 300 (rarely used in high-pressure or high-stress environments).

- Facing Type: Plain flat face on the stub end (the backing flange itself has a machined internal radius to match the stub end shoulder).

 

Primary Applications:

- Systems requiring frequent line disassembly or cleaning (e.g., food processing, paper pulp, pharmaceutical lines).

- Low-pressure, non-critical process piping systems.

- High-cost material systems (e.g., Titanium, Nickel Alloys, Stainless Steel) to reduce overall material expense.

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Stainless Steel Blind Flange Description

 

Overview:

A Stainless Steel Blind Flange (BLRF/BLFF) is a solid, circular steel plate featuring bolt holes around its outer perimeter but no center opening. It is designed to be bolted to another flange to terminate flow, isolate a piping section, or provide an accessible entry point for line inspection, maintenance, or future pipeline extensions.

 

Key Features & Construction:

- Solid Construction: Complete flat or raised center disc capable of withstanding full system line pressure.

- Easy Access: Unlike permanent welded caps, a blind flange can be unbolted and removed for maintenance or system expansion.

- Common Material Grades:

  * SS 304 / 304L: Standard grade providing excellent general corrosion resistance, suitable for water, food, and general industrial applications.

  * SS 316 / 316L: High-grade stainless steel containing molybdenum for enhanced resistance to chlorides, chemicals, and marine environments.

- Common Flange Facings:

  * Raised Face (RF): Concentrates gasket compression for standard-to-high pressure seals.

  * Flat Face (FF): Used in lower-pressure systems or when mating with brittle equipment.

  * Ring Type Joint (RTJ): Features a metal gasket groove for extreme high-pressure and high-temperature environments.

 

Manufacturing Standards & Pressure Class:

- Standards: ASME B16.5, ASME B16.47, EN 1092-1, DIN standards.

- Pressure Classes: Class 150, 300, 600, 900, 1500, and 2500.

 

Primary Applications:

1. Pipeline Isolation: Sealing off sections of piping during maintenance or modifications.

2. Pressure Testing: Capping line ends during hydrostatic or pneumatic pressure tests.

3. System Endpoints: Closing temporary or permanent terminal ends in chemical, oil & gas, water treatment, and food processing facilities.