ASME B16.5 Standard

ASME B16.5 is an international standard that specifies pipe flanges and flanged fittings for industrial piping systems. It defines nominal sizes, pressure-temperature ratings, dimensions, tolerances, materials, marking and testing requirements.

ASME B16.5 flanges are widely used in oil and gas, petrochemical, chemical, power generation, water treatment and general industrial applications. The standard ensures interchangeability, safety and stability for flanged connections. Threaded flanges under ASME B16.5 are usually available in pressure classes including Class 150, Class 300 and Class 600 etc, with size ranges mainly from NPS 1/2” to NPS 4”.

Threaded Flange – ASME B16.5

ASME B16.5 threaded flange is a flange with internal threads machined in the bore. It can be directly screwed onto external threaded pipes without welding. This design makes it ideal for applications where welding is difficult, dangerous or not permitted.

Compared with weld neck, slip-on and socket weld flanges, threaded flanges provide faster assembly and disassembly. They are commonly used in small-size piping systems that require quick installation or frequent maintenance. Although they are not designed for high-temperature or high-stress conditions, they perform reliably in many non-critical utility lines.

Characteristics of Threaded Flange

Threaded flanges under ASME B16.5 have distinct structural and functional characteristics:

• No welding required during installation
• Easy and fast assembly and disassembly
• Suitable for small-diameter piping systems
• Good for areas where hot work is restricted
• Lower installation cost compared with welded flanges
• Limited use in high-temperature, high-pressure or vibrating conditions
• Generally used in NPS 1/2” to NPS 4” sizes
• Compatible with various threaded pipe ends

These characteristics make threaded flanges a preferred choice in many light industrial and utility applications.

Thread Types – NPT/BSPT/BSPP

NPT (ASME B1.20.1) is the thread type specified in ASME B16.5 for threaded flanges. It is a tapered thread that creates a pressure-tight seal when tightened, making it the universal choice for North American and global industrial systems. All standard ASME B16.5 threaded flanges are manufactured with NPT threads.

BSPT (British Standard Pipe Taper) – Custom Option

BSPT is a tapered thread used in British and Commonwealth markets. It is not part of the ASME B16.5 standard but is available as a custom thread for regional compatibility.

BSPP (British Standard Pipe Parallel) – Custom Option

BSPP is a parallel thread that requires a gasket or Oring for sealing. It is used in hydraulic, pneumatic, and some European systems and is offered as a non-standard custom thread for ASME B16.5 flanges.

Sealing Faces of ASME B16.5 Threaded Flange

The sealing face of a threaded flange directly affects leakage prevention and compatibility with gaskets. Common sealing face types under ASME B16.5 include:

Raised Face (RF)

Raised Face is the most popular sealing face for threaded flanges. It provides good sealing with most gasket types and fits general industrial applications.

Flat Face (FF)

Flat Face is used mainly in low-pressure systems and is often matched with cast iron valves or equipment to avoid damage during assembly.

Ring Type Joint (RTJ)

RTJ is used in high-pressure and high-temperature conditions, though less common for standard threaded flanges.

To know more about flange sealing faces, please click.

Weight Reference for Carbon Steel Threaded Flange

Why Choose ASME B16.5 Threaded Flange?

There are many practical reasons to choose ASME B16.5 threaded flanges:

• No welding needed, which saves time and labor costs
• Allowed in areas where welding or hot work is prohibited
• Easy installation and maintenance
• Suitable for small-bore pipes and low-pressure systems
• Interchangeable with other ASME B16.5 flanges
• Wide availability of materials and sizes
• Ideal for temporary or removable piping connections

For projects that prioritize speed, safety and convenience, threaded flanges are an excellent solution.

Where to Apply Threaded Flange?

ASME B16.5 threaded flanges are widely used in many industries and systems:

• Compressed air piping
• Water supply and utility lines
• Chemical processing for small pipes
• Petroleum refining auxiliary systems
• Fire protection systems
• Pneumatic and hydraulic circuits
• Facilities where welding is restricted
• Maintenance and temporary piping connections

They are especially suitable for low-pressure, small-diameter and non-critical applications.

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Hastelloy C276 is an alloy that stands out due to its unique combination of elements: its main components are nickel, molybdenum, and chromium, with trace amounts of iron, tungsten, cobalt, and other elements. This combination of elements gives Hastelloy C276 exceptional properties, which are extended to the flanges made from it. The two most commonly used thread standards globally are BSP and NPT threads. Although their purposes are similar, they have different characteristics and applications.

Specifications of Hastelloy C276 Flanges

Hastelloy C276 Flange Standards

Material Standards: ASTM B564 (forged flanges), UNS N10276, Werkstoff Nr. 2.4819, etc.

Dimension Standards:

ASME B16.5 (for pipe flanges and flange fittings from NPS 1/2“ to NPS 24”)

ASME B16.47 (for large-diameter steel flanges from NPS 26“ to NPS 60”)

EN 1092 (European flange standard)

DIN (German standard)

JIS (Japanese standard)

Common Types of Hastelloy C276 Flanges

Chemical Composition of ASME SB 564 N10276 Flanges

· High nickel (Ni) content: Ensures the stability of the alloy in reducing media, forming the foundation for corrosion resistance;

· Chromium (Cr): Provides oxidation resistance and corrosion resistance in oxidizing media (such as nitric acid);

· Molybdenum (Mo) + Tungsten (W): Significantly enhances resistance to localized corrosion (pitting corrosion, crevice corrosion), especially in chloride-containing environments;

· Low carbon (C): Prevents the formation of carbides between carbon and chromium, thereby preventing intergranular corrosion.

ASTM B564 Hastelloy C276 Mechanical Properties

Equivalent Grades of Hastelloy C276 Flanges

Key Features

✅ Exceptional corrosion resistance: exhibits outstanding resistance to strong oxidizing and reducing media such as hydrochloric acid, sulfuric acid, chlorides, and chlorine gas.

✅ Superior mechanical properties: maintains stable strength and toughness even under high-temperature, high-pressure conditions or in strongly acidic environments.

✅ Strong resistance to localized corrosion: Effectively resists pitting corrosion, crevice corrosion, and intergranular corrosion.

✅ Good weldability: Easy to process and weld, with no reduction in corrosion resistance in the welded area.

✅ High-temperature performance: Hastelloy C276 exhibits excellent stability, particularly maintaining strength and structural integrity at high temperatures around 700°C.

Hastelloy C276 Flanges Dimension

Application Scenarios

Hastelloy C276 flanges, renowned for their exceptional corrosion resistance, are primarily used in extreme environments where conventional materials cannot withstand the conditions. Typical applications include:

Chemical and Petrochemical Industries

Environmental Protection Industry

Pharmaceutical and Food Industries

Marine Engineering

Nuclear Industry

Installation and Maintenance Guidelines

Avoid contact between dissimilar metals: When in contact with metals of lower potential, such as carbon steel, galvanic corrosion may occur. Insulating gaskets (e.g., PTFE) or coatings should be used to isolate the metals;

Gaskets selection: Prioritize gaskets with matching corrosion resistance, such as PTFE or metal-backed gaskets, to prevent gasket material corrosion by the medium and subsequent leakage;

Cleaning and Pre-Treatment: Before installation, remove oil stains and oxide scale from the flange surface using a stainless steel wire brush or specialized cleaner to prevent impurities from affecting sealing performance;

Torque Control: Apply tightening torque according to flange specifications and pressure ratings in accordance with standards to avoid over-tightening, which can cause flange deformation or bolt breakage.

You can get an offer for products in below material forms:

-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)

-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )

-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)

-Round bar , Billet (ASTM A276, ASTM A479)

– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)

-Bolting, Nuts（ASTM A193, A194, A320）

Hastelloy C276 Flanges Exported Countries

We Export  Hastelloy C276 Flanges to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Europe, Africa, Asia, North America, South America, Middle East.etc

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