asme b16.5 – Standard, Dimensions

asme b16.5

ASME B16.5 refers to a standard developed by the American Society of Mechanical Engineers (ASME) for pipe flanges and flanged fittings. It provides specifications and guidelines for the design, dimensions, materials, and testing of these components.

Here are some key details about ASME B16.5:

1. Scope: ASME B16.5 covers flanges and flanged fittings made from cast, forged, or plate materials. It includes various types of flanges, such as weld neck, slip-on, socket weld, threaded, lap joint, and blind flanges, asme b16.5 flange dimensions.
2. Dimensions: The standard specifies the dimensions of flanges, including outer diameter (OD), bolt circle diameter (BCD), thickness, bore diameter, and various other parameters. These dimensions are intended to ensure compatibility and interchangeability of flanges from different manufacturers.
3. Pressure ratings: ASME B16.5 provides pressure-temperature ratings for flanges, indicating the maximum allowable pressure at a given temperature. These ratings are classified into several pressure classes, such as 150, 300, 600, 900, 1500, and 2500, which correspond to different pressure levels.
4. Materials: The standard lists the materials suitable for flanges, including carbon steel, stainless steel, alloy steel, and non-ferrous metals. It specifies the requirements for material composition, mechanical properties, and heat treatment.
5. Marking and identification: ASME B16.5 outlines the marking requirements for flanges, such as the manufacturer’s name or trademark, flange size, pressure class, material designation, and heat number. These markings help in proper identification and traceability of the components.
6. Testing and inspection: The standard provides guidelines for various tests and inspections to ensure the quality and performance of flanges. This may include visual examination, dimensional inspection, material testing, pressure testing, and non-destructive examination techniques.

It’s important to note that ASME B16.5 is regularly updated, and the latest version available at the time of my knowledge cutoff in September 2021 was the 2017 edition. Therefore, it is recommended to consult the most recent version or specific requirements for accurate and up-to-date information.

ASME b16.5 flange dimensions

asme b16.5 flange dimensions

Table that provides ASME B16.5 flange dimensions for weld neck (WN) and slip-on (SO) flanges. Please note that the dimensions are approximate and can vary depending on the specific flange size and pressure class.

Nominal Pipe Size (NPS)	Flange Size (inches)	Flange OD (A)	Raised Face Diameter (B)	Bolt Circle Diameter (C)	Number of Bolt Holes	Bolt Hole Diameter (D)	Bolt Hole Diameter (E)
1/2	1.38	1.88	1.38	1.38	4	0.62	0.88
3/4	1.69	2.25	1.69	1.69	4	0.62	0.88
1	2.04	2.62	2.04	2.38	4	0.62	0.88
1 1/4	2.38	3.00	2.38	2.75	4	0.62	0.88
1 1/2	2.81	3.50	2.81	3.12	4	0.62	0.88
2	3.50	4.62	3.50	3.88	4	0.62	0.88
2 1/2	4.00	5.00	4.00	4.62	4	0.62	0.88
3	4.50	5.62	4.50	5.00	4	0.62	0.88
4	5.00	6.62	5.00	5.50	8	0.75	1.12
5	6.00	7.75	6.00	6.50	8	0.75	1.12
6	7.00	8.62	7.00	7.50	8	0.75	1.12
8	9.50	11.75	9.50	9.88	8	0.75	1.12
10	11.50	14.00	11.50	12.75	12	0.88	1.38
12	13.50	16.25	13.50	15.00	12	0.88	1.38
14	15.00	18.50	15.00	16.75	12	0.88	1.38
16	16.50	21.25	16.50	18.75	16	1.00	1.62
18	18.50	23.75	18.50	21.00	16	1.00	1.62
20	20.50	26.25	20.50	23.00	20	1.12	1.88
24	24.50	31.25	24.50	27.25	20	1.12	1.88

Please note that these dimensions are for illustration purposes and you should refer to the official ASME B16.5 standard or specific manufacturer documentation for precise dimensions corresponding to your requirements.

1. What does ASME B16.5 mean?
   ASME B16.5 refers to a standard developed by the American Society of Mechanical Engineers (ASME) for pipe flanges and flanged fittings. It provides specifications and guidelines for the design, dimensions, materials, and testing of these components. ASME B16.5 is widely recognized and used in various industries to ensure compatibility and safety in piping systems.
2. What material is ASME B16.5 made of?
   ASME B16.5 does not specify the material of the flanges itself. Instead, it provides guidelines for various types of flanges made from different materials, such as carbon steel, stainless steel, alloy steel, and non-ferrous metals. The material selection depends on the application requirements, including factors like pressure, temperature, corrosion resistance, and mechanical properties.
3. What are the ANSI B16.5 stainless steel flange ratings?
   ANSI B16.5 is the same as ASME B16.5, as ANSI (American National Standards Institute) is the U.S. representative to the International Organization for Standardization (ISO) and adopts ASME standards. The flange ratings for stainless steel in ANSI/ASME B16.5 are typically available in pressure classes 150, 300, 600, 900, 1500, and 2500. These ratings indicate the maximum allowable pressure at a given temperature for stainless steel flanges of various sizes.
4. What is ANSI B16.5 Class 150 flange?
   ANSI B16.5 Class 150 flange is a specific type of flange that conforms to the dimensional requirements of the ANSI/ASME B16.5 standard and has a pressure rating of 150 pounds per square inch (psi). Class 150 flanges are designed for relatively low-pressure applications and are commonly used in industries such as petrochemical, oil and gas, water treatment, and general piping systems. The flanges in Class 150 are available in various types, including weld neck, slip-on, socket weld, threaded, lap joint, and blind flanges.

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