Valve Flange Slip Chart and Comparison - ASME/BS/AS/PN/EN/ISO Dimensions
ASME Flange Diagram – B16.5
- 150 CLASS
- 300 CLASS
- 600 CLASS
- 900 CLASS
- 1500 CLASS
- 2500 CLASS
AS2129/AS4087 Steel Flange Table
EN1092-1 PN flange table
- PN 6 – 100
API6A Slide Rulers for Flange, Pin and Gasket – API6B/API6BX
- 2.000 – 15.000 PSI
In Australia, the BS and AS flange standards are essentially the same, but are metric. Therefore metric sizes are given as 'DN' (nominal diameter) in mm. The equivalent imperial size is rounded to the nearest multiple of 25 mm (for 2” and above) as below. However, the actual dimensions and bore sizes have not changed. 'NB' (nominal bore) is also sometimes used when referring to valve sizes.
The most common flange used in Australia in oil, gas and mining is now the ANSI flange to ANSI B16.5. However, in general, commercial and waste/water industries, the AS2129 table flange is the most common. The increasingly common European PN-marked flanges are also listed in BS4504, as well as AS4331 and EN 1092-1. BS4504 is now obsolete and has been replaced by EN 1092 which is listed in British Standards as BS-EN 1092. EN 1092 developed from DIN 2501 which became part of ISO 7005, then EN 1092 was created as a DIN based flange standard. (BS4504 flanges were generally the same as the old DIN 2501 specification, but the new EN 1092 standard covers a wider range). EN 1092-1 is for steel flanges, EN 1092-2 is for iron flanges, EN 1092-3 is for alloy flanges, EN 1092-4 is for aluminum alloy flanges. PN stands for nominal pressure and is roughly equal to the number of bars, i.e. cold working pressure PN10 is 10 bars. Ratings range from PN2.5 to PN420. The latest Australian Standard AS4331 specifies this rating system (PN2.5 to PN420). AS4331 is a reproduction of ISO 7005 based on the American and European flange systems PN20, PN50, PN 110, PN 150, PN 260 and PN 420 steel flanges are "designed to be interchangeable" with American ANSI/ASME B16 .5 flanges. and MSS SP44; are not identical but are "deemed to conform" to the dimensions specified in ANSI/ASME B16.5 and MSS SP44 as applicable.
Class 150: PN 20
Class 300: PN 50
Class 600: PN 110
Class 900: PN 150
Class 1500: PN 260
Class 2500: PN 420
ISO 7005 (of which AS4331 is a reproduction) also includes European DIN flanges PN6/10/16/25/40 which were previously DIN 2501-1 and BS4504. These flanges are the same as EN1092, but EN1092 also includes flanges with a higher DIN rating. Consequently in Australia most users simply refer to the original ASME B16.5 standards as they are already in use in Australia for the oil, gas and mining industry and in fact at pressures above table E it has been the dominant standard in use for the past 30 years. However, piping engineers must refer to the new AS standard AS4331 for interpretations and specification requirements. Note that in the case of AS4331.1/ISO 7005-1 ANSI equivalents they are not absolutely identical to ANSI, but are "considered compliant and designed to be interchangeable".
Piping class ratings based on ASME B16.5 and corresponding PN ratings: –
|Nominal pressure of the flange, PN||20||50||68||100||150||250||420|
PN is the nominal value designation followed by a designation number indicating the approximate nominal pressure ubars.
PN ratings do not provide a proportional relationship between different PN numbers, while class numbers do.
AS2129 is derived from BS10 and is metric. In some cases slightly larger screw holes give better spacing because metric screws are specified instead of the UNC screws used by BS10. AS4087 is an update to AS2129, however AS2129 is still widely used so it has not been deleted as a standard, but now only covers AS table D to H.
AS4087 is the latest standard for BS tables D to H, the same drilling is used, but the new PN pressure rating system is adopted. Since the new pressure values are slightly higher, the thickness of the flange is slightly increased. Also, the dimensions of the raised face (although it is rarely stated, mostly a flat face is used) are somewhat larger. Table C, J to R, no longer exists, PN16 is the same bore as Table D, PN21 is the same as Table E, PN35 is the same as Table H.
AS4331 covers PN2.5 to PN420 and the sizing and drilling used is a replication of ISO 7005-1 which in turn is the metric equivalent of ASME B16.5 Class 150 to 2500. ISO 7005-1 also includes superseded DIN 2533 & DIN 2501 flanges which AS4331 also includes (also mirrored in EN1092).
AS/NZS 4331 is identical to and reproduced from ISO 7005.
4331.1– Steel flanges(ISO 7005-1)EN1092-2 (na temelju DIN 2501/BS4504) PN2.5 / 6 / 10 / 16 / 25 / 40 i ANSI 150~2500LB ISO ekvivalent PN 20 / 50 / 110 / 150 / 260 / 420
4331.2– Cast iron flanges(ISO 7005-2)PN2,5 / 6 / 10 / 19 / 20 / 25 / 40 / 50
4331.3– Copper alloy and composite flanges(ISO 7005-3)PN10 do N50
Although the standards say they are identical, I notice some very small differences in flange thickness between ISO 7005 (AS4331) and EN1092. See Global Supply Line online slide rule above for differences.
AS 4331 is a reproduction of ISO 7005 based onAmerican and Europeanflange systems. PN20, PN50, PN110, PN150, PN260 and PN420 steel flanges are "designed to be interchangeable" with American ANSI/ASME B16.5 and MSS SP44 flanges. They are not identical, but are "deemed to conform" to the dimensions specified in ANSI/ASME B16.5 and MSS SP44 as applicable.
ANSI standard based flanges cover AS 4331.1/ISO 7005-1
Class 150: PN20
Class 300: PN50
Class 600: PN110
Class 900: PN150
Class 1500: PN260
Class 2500: PN420
ISO 7005 (of which AS 4331 is a reproduction)also includes European DIN flangesPN6 / 10 / 16 / 25 / 40 which were previously DIN 2501-1 and BS4504. These flanges are the same asEN1092but EN1092 also includes flanges with a higher DIN rating.
Although the standards say they are identical, there are some very small differences in flange thickness between ISO 7005 (AS4331) and EN1092. See Global Supply Line online slide rule above for differences.
Steel based on DIN/BS4504 based on flanges covered by AS 4331.1/ISO 7005-1
Iron DIN/ BS4504 based on flanges covered by AS 4331.2/ ISO 7005-2
The API6A flange is used in Australia in oil drilling and wellhead systems. (see our oilfield slide ruleclick here. API ratings range from 2,000 to 20,000 psi (cold working pressure). ANSI was originally derived from API, therefore in class 600 to 900 and 1500 ANSI flanges are dimensionally equivalent to API 2000, 3000 and 5000 in most sizes up to ANSI 300NB (12”) API 13 5/8” but ANSI flanges are manufactured of carbon steels with lower yield strength are rated for lower working pressure. However, GSL does stock API6A 45K high yield carbon steel weld necks that are compatible with ASME A234 WPB fittings and A106B/API5LB pipe.Click herefind out more.
ASME (American Society of Mechanical Engineers, of which Australian Pipeline Valve is a member) is a group of standards, which in turn are covered by the American Standards Institute (ANSI), so their flanges may be referred to as ANSI or ASME class. The class is also traditionally abbreviated CL or LB (verbally as a pound) or cross section (#), but not psi as this can be misinterpreted as cold working pressure (CWP). Since ANSI 150 for example has a CWP of 285 psi, unlike the PN system, the grade is not related to the CWP. AS4331 has adopted ANSI drilling and sizing, but uses PN classes. Therefore, in some sizes the flanges are thicker to bring the value up to the required PN value.
ASME pressure class flange
Forged steel flanges, ASME B16.5, are manufactured in seven primary grades:
150 lbs – 300 lbs – 400 lbs – 600 lbs – 900 lbs – 1500 lbs – 2500 lbs
The Class 300 flange is rated for a higher pressure than the Class 150 flange, because the Class 300 flange is constructed with more metal and therefore can withstand more pressure. However, there are a number of factors that can affect the pressure capability of a flange.
The pressure class for flanges is often expressed in 'pounds'. Different names are used to indicate the pressure class. For example: 150 Lb or 150 Lbs or 150# or Class 150, they all mean the same thing.
ASME pressure rating
Flanges can withstand different pressures at different temperatures. (See pressure/temperature charts on this website for various types of materials). As the temperature increases, the nominal pressure of the flange decreases. For example, a Class 150 A105 flange is rated at approximately 270 PSIG (1861 KPA) at ambient temperature, 180 PSIG (1241 KPA) at approximately 400ºF (204ºC), 150 PSIG (1034 KPA) at approximately 600ºF (315ºC), and 75 PSIG (517 KPA) at approximately 800ºF (426ºC). Consequently, when the pressure drops, the temperature rises and vice versa. Additional factors are that flanges can be made of different materials, such as stainless steel, cast and ductile iron, alloy steel, carbon steel, etc. Each material has a different pressure rating.
Below is an example of an NPS 12 (300NB) flange in all major pressure classes. This example shows that all the diameters of the raised face are the same; but the outer diameter, screw circle and screw hole diameter become larger in each higher pressure class. The bore is subject to the required layout. For flange dimensions see our flange chart - 'Online Slider' above. The number and diameter (mm) of the bolt holes for the 300NB example below is: 12 x 25.4 mm, Class 150, 16 x 32 mm, Class 300, 16 x 34.9 mm, Class 400, 20 x 34.9 mm, class 600, 20 x 38.1 mm class 900, 16 x 54 mm class 1500 and 12 x 73 mm class 2500.
Pressure and temperature ratings
The pressure/temperature ratings are the maximum allowable operating pressures permitted by ASME B16.5 (published in metric and imperial units). For medium temperatures, linear interpolation is calculated by the manufacturers.
The pressure and temperature markings refer to flanged joints which can be reduced by the use of gaskets or wedges.
The temperature shown for the corresponding pressure rating is the temperature of the valve shell or pressure retaining flange. Generally, this temperature is the same as the temperature of the medium in the line and the ambient temperature, whichever is higher (but the lowest temperature of each must also be considered for low temperature operation). For any temperature below -29ºC, the rating should not be higher than the rating shown for -29ºC, depending on the materials, the rating may be lower.
The two tables below are examples of two material groups according to ASTM, flange pressure and temperature values according to ASME B16.5 – 2009.
|ASTM Group 2-1.1 Materials|
|C-Si||A105 (1)||A216 Gr.WCB (1)|
|C-Mn-Si||A350 Gr.LF2 (1)||–|
|3 1/2N.I||A350 Gr.LF3||–|
|C-Mn-Si-V||A350 Gr.LF6 Cl 1 (3)||–|
(1) After prolonged exposure to temperatures above 425ºC, the carbide phase of steel can be converted to graphite. Allowed but not recommended for extended use above 425ºC.
(3) Do not use more than 260ºC.
|ASTM Group 2-2.3 Materials|
|16Cr-12Ni-2Mo||A182 Gr.F316L||A351 CF3M|
|18Cr-8Ni||A182 Gr.F304L (1)||A351 CF3|
(1) Do not use above 425ºC.
The 2 tables below show ANSI/ASME classes 150 to 2500LB pressure/temperature for groups 2-1.1 and 2-2.3
|Pressure and temperature ratings for materials of ASTM group 2-1.1|
|Operating pressure by class, BAR|
|-29 do 38||19.6||51.1||68.1||102.1||153.2||255.3||425.5|
|Pressure and temperature ratings for materials of ASTM group 2-2.3|
|Operating pressure by class, BAR|
|-29 do 38||15.9||41.4||55.2||82.7||124.1||206.8||344.7|
LB is the origin of the Latin word Libra (scale), a Roman unit of mass similar to the pound, so this is accepted as another way of saying Class. Never say PSI as this can be confused with API 6B flanges that are rated to PSI (CWP).
|Temperature-pressure markings for carbon steel plate flanges|
|Weight – kPa, Temperature – oC|
|F||2100||in the year 2000||1800||1700||1600||1400||1300||1200||1100||3150|
|H||3500||3300||3100||2900||2600||2400||in the year 2000||in the year 2000||1700||1300||900||5250|
AS2129 Still in use but now only covers Tables D to H (Tables C are now obsolete), Tables J to T have now been replaced by AS4331 which is a replication of ISO7500-1 which in turn is equivalent to ASME 150-2500 class ANSI B16.5 ) . AS4087 is a new standard covering Tables D to H. The same drilling is specified, but the PN rating system (PN16 to PN35) is used.
For ANSI Class 150 to 2500 Flange Pressure/Temperature Ratings see Forged Pressure/Temperature Ratings shown belowconnection.
DIN standards use Pressure Nominale (PN) to designate a pressure rating—for example, PN16 is suitable for use up to 16 bar at ambient temperature. ANSI standard lists “Class,” which is the pressure-temperature rating based on PSI, with different pressure ratings based on a maximum temperature.What is the difference between AS4087 and AS2129? ›
AS4087 is an update of AS2129, however AS2129 is still widely used so it has not been deleted as a standard, however, it now only covers AS table D to H. AS4087 is the latest standard for BS table D to H, the same drilling is used but the new PN pressure rating system has been adopted.
ASME Flanges are based on guidelines and regulations for mechanical devices, while ANSI Flanges are based on standards developed by associations. ANSI flanges are generated using approximately 9500 standards, whereas ASME flanges are produced using 600 codes and regulations for various mechanical devices.What size is a bs10 flange? ›
The BS 10 Flange Dimensions in MM can be expressed as 15mm to 600mm for ½ inches to 24 inches range.What does PN stand for on flanges? ›
Nominal diameter (DN) and nominal pressure (PN)What does PN number mean on flange? ›
The “PN” stands for “Pressure Nominal” and refers to the pressure rating of the flange. For example, a flange may be designated DN100 PN10, indicating a nominal diameter of 100mm and a pressure rating of 10 bar.What is the difference between ANSI B16 47 Series A and Series B? ›
So what is the difference between ASME B16. 47 Series A and Series B (API605) flanges? Generally speaking, ASME B16 47 Series A flanges are much thicker, heavier and stronger than Series B flanges in the same size and pressure rating thus can withstand more external loading than Series B type.What is the difference between 150 and 300 ANSI flange? ›
A Class 300 flange is rated to a higher pressure than a Class 150 flange, because a Class 300 flange is constructed with more metal and therefore can withstand more pressure.What is as2129? ›
This Standard is applicable to flanges for water, steam, compressed air, chemical and petroleum plants, hydraulic piping and where other Standards require compliance with this Standard. This Standard is not intended to apply to flanges for water or waste water covered by AS 4087.What is the difference in ISO and ASME? ›
The main differences between the ISO and ASME Drawing Standard in Fusion 360 are as follows: The sheet size: ISO uses A series paper sizes. ASME uses ANSI standard paper sizes.
ASME Flanges and ANSI Flanges are interchangeable and that there is no distinction between the two.What are the differences between ASME and ISO? ›
ASME standards cover various aspects of mechanical engineering, including piping, welding, materials, and fasteners. ISO stands for International Organization for Standardization, and it was founded in 1947 as a way to facilitate international trade and cooperation.How do you identify a standard flange? ›
When trying to determine the flange rating of a pump, the best method is to look for a stamp printed onto the flange. If one is not visible, or it is worn, then start by counting the number of bolt holes. This will point you to a narrower range of flange sizes in the chart below.How do you read flange specs? ›
- the nominal size (i.e. the bore size of the flange, to match the bore size of the connecting pipe)
- the flange rating (which designates the pressure/temperature performance of the flange, i.e. 150#, 300#, 400#, up to 2500#)
- the schedule for welding neck flanges (that should match the pipe schedule)
The British Standard BS10, 1962 is a standard Specification for Flanges and Bolting for Pipes, Valves, and Fittings. The bs 10 flange dimensions in mm covers boss, plain, integrally cast or forged, and welding neck type flanges, in flanges as per bs 10 table e. BS 10 Forged Flange.What are the different types of PN flanges? ›
'PN' stands for Pressure Nominale and prefixes the pressure rating, e.g. a PN16 flange is designed to operate up to 16 bar. Typical ratings include PN6, PN10, PN16, PN25, PN40, PN64, PN100. The American ANSI standard refers instead to a pressure / temperature rating termed 'Class'.What PN number means? ›
A part number (often abbreviated PN, P/N, part no., or part #) is an identifier of a particular part design or material used in a particular industry. Its purpose is to simplify reference to that item.What is ASME PN equivalent? ›
|PN According to EN 1092-1 or ISO-7268||Class according to ASME B16.34.|
|PN 20||CL 150|
|PN 50||CL 300|
|PN 64||CL 400|
|PN 100||CL 600|
PN Is the nominal working pressure rating. The number used to describe PN is 10 times the value of the maximum allowable operating pressure (MAOP) at 20°C (MPa x10) based on a design factor of 1.25. SDR Nominal ratio of outside diameter to wall thickness.Are PN16 and PN40 flanges the same? ›
Standards of flanges vary worldwide, meaning that in most cases they are not interchangeable. The size, drilling and pressure range will be different (ie: a PN16 flange is not rated to the same pressure class as a PN40 flange... nor would a PN16 flange fit an ANSI 150 flange).
Pressure rating is defined as the maximum allowed pressure that a flange can withstand at increasing temperatures. According to the ANSI/ASME B16. 5 specification, there are seven flange pressure ratings: 150, 300, 400, 600, 900, 1500, and 2500.What is the difference between ANSI and ASME pipe standards? ›
ANSI establishes and accredits performance and quality standards for products and services in a wide variety of sectors, while ASME is primarily focused on boilers and pressure vessels.What is the difference between ANSI and ASME pipe? ›
ANSI accredits and established quality and performance standards for services and products in a huge variety of sectors, while the primary focus of ASME is on pressure vessels and boilers.What is class for ANSI flange? ›
What is an ANSI Class Rating? The ANSI Class rating of a flange is defined as the maximum amount of pressure that the flange can withstand at increasing temperatures. There are seven primary pressure classes for flanges. They are 150, 300, 400, 600, 900, 1500, and 2500.Are 900 and 1500 flanges the same? ›
Likewise, class 900 flanges are identical to class 1500 flanges in all respects for half inch to the two and a half inch inclusive. So in this case, all three of these flanges have four bolt holes. That's not enough to describe a flange completely.What is the pressure rating for ANSI 1500 flange? ›
If the temperature for Class 1 1500# flange is < 100 degrees Fahrenheit, the maximum pressure for flanges is 3705 psi. If the temperature for Class 1 1500# flange is 200 degrees Fahrenheit, the maximum pressure for flanges is 3395 psi.
1 Class 125 flanges are made from cast iron, ANSI/ASME B16. 5 Class 150 can be made from steel or stainless and ANSI/ASME B16. 42 Class 150 is made from ductile iron. However, the bolting pattern is the same for both Class 125 and 150 so, regardless of material, they will bolt together.What material is AS2129? ›
Material: Plate Steel. Pressure Rating: 3500 kPa. Dimensional: AS2129.What standard are table E flanges? ›
|Standard||Class||Bolt Circle Diameter|
|AS 2129||Table D||67|
B16. 5 is limited to flanges and flanged fittings made from cast or forged materials, and blind flanges and certain reducing flanges made from cast, forged, or plate materials. Also included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints.
ASTM is responsible for the development and re-enactment of standards for all types of old and new materials. Because it is the test and materials association. ASME is to selectively absorb and filter these standards for the relevant works used, and to be modified to improve.What is the difference between ASTM and ASME material specification? ›
Basically ASTM creates the material specifications and standard test methods to determine compliance. ASME selects those ASTM materials which will perform adequately in boiler or pressure vessel service and accepts them with stated limitations.Is An ISO the same as an ANSI? ›
The acronyms, ANSI and ISO, stand for two different world's standards organizations. ANSI stands for the American National Standards Institute, and ISO stands for the International Organization for Standardization. These are both keyboard layouts that describe the size and position of the keys.What is the difference between ASTM and ANSI? ›
The main difference between ASNI and ASTM is that ANSI is focused primarily on voluntary guidance on processes and is an umbrella organization that covers several industries in which they accredit other organizations to do so and approve the standards they develop (including the ASTM).Can you need two different flange sizes? ›
In all actuality, you may need a smaller or bigger size. And, to make it even more fun, you might need two different-sized flanges - one for each side - to get the job done! The flange funnel creates a vacuum seal around the areola and the nipple should move freely within the tube.What are the two types of ISO standards? ›
The standards have been set after proper research was done by international experts. In simple words, ISO standards ensure the quality, safety and efficiency of the products and services. The most common standards that apply to every business and organization are ISO 9001 and ISO 14001.Is ASME a part of ISO? ›
Long recognized for our development of mechanical engineering standards, ASME also administers several bodies that develop the United States position on activities conducted under the auspices of the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC).What are the 3 most common flange types? ›
The most common flange types are: Welding Neck Flange. Slip-on Flange. Socket Weld Flange.What are the most common flange standards? ›
While America's most common standards for flanges and fittings are AWWA, ANSI, and ASME, European and international industries rely on DIN standards, which use the metric system. DIN flanges are available in the same flange styles as ASME/ANSI flanges, such as slip-on, weld-neck, and blind flanges.What is the most common size flange? ›
The average flange is between 24 and 27 millimeters (mm)—which corresponds to the size of your nipple—but not everyone who breastfeeds will fit these sizes. You can get smaller or larger flanges depending on the material: plastic flanges range from 21 mm to 36 mm and there is a 40 mm glass flange available.
- Manufacturer identification or logo.
- Type of designated material according to the ATSM (American Society for Testing and Materials) including thermal treatment.
- Face type.
- The standardised type used to manufacture the flange.
For example, a Class 150 flange is rated to approximately 270 PSIG at ambient conditions, 180 PSIG at approximately 400°F, 150 PSIG at approximately 600°F, and 75 PSIG at approximately 800°F.What are the pressure classes for flanges? ›
ASME B16. 5 provides seven pressure classes for flanges. They are Classes 150, 300, 400, 600, 900, 1500, and 2500. The pressure-temperature ratings for flanges representing all material groups are organized within 44 tables, one table included in ASME B16.What is the ASME Code for flange design? ›
ASME B16. 5 is a construction code for the design of new flanges and related fittings such as reducers, tees and similar. It is one of the related codes referenced in API 570 and API 574 and so forms an important (but not particularly large) part of the API 570 examination syllabus. Like ASME B31.What is the ISO code for flanges? ›
ISO Flanges Standard (ISO 7005-1, ISO 9624) - Manufacturers & Stockists.What is the ASME Code for large flanges? ›
The material used to manufacture large flanges
Almost every type of flange has a seal attached to it to preclude any leaks from the pipeline. The ASME/ANSI B16. 47 Large Diameter Steel flanges include NPS 26 through NPS 60.
In case this is the first time you're hearing the phrase, ANSI flanges simply refers to flanges whose construction meets ANSI (American National Standards Institute) specifications.What is ANSI in flanges? ›
The ANSI Class rating of a flange is defined as the maximum amount of pressure that the flange can withstand at increasing temperatures. There are seven primary pressure classes for flanges. They are 150, 300, 400, 600, 900, 1500, and 2500.What is PN25 pressure rating in ANSI? ›
PN (Pressure Nominal) is indicated in bar; for example, PN25 is 25 bar. 1 bar equals 14.5 psi. Sometimes manufacturers will include the psi rating as well. Flanged or lug-style valves are categorized by ANSI flange classes covered under ASME B16 standards.What are ANSI flanges used for? ›
ANSI flanges are a type of industrial flange used to connect two pieces of piping or equipment. They are designed to provide a secure and reliable connection, while allowing for easy access and maintenance. ANSI flanges come in various sizes and styles, depending on the application they are used for.
When trying to determine the flange rating of a pump, the best method is to look for a stamp printed onto the flange. If one is not visible, or it is worn, then start by counting the number of bolt holes. This will point you to a narrower range of flange sizes in the chart below.What are the different types of ISO flanges? ›
Two Types of ISO Vacuum Flanges
ISO high vacuum hardware comes in two different connection types: bolted or clamped. Bolted is commonly referred to as ISO-F, while clamped is called ISO-K. ISO-K is more common because it allows for quick release connections using single or double claw clamps.
However, the standard ASME B16 5 (ANSI B16 5) only covers size up to 24 inches. For bigger sizes, ASME B16. 47 standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60 and in ratings Classes 75, 150, 300, 400, 600, and 900.What is the difference between ANSI and API pressure rating? ›
The difference between ASME/ANSI and API is the fabrication material and a higher rated API operating pressure. ASME/ANSI flanges are commonly used in industrial process systems handling water, steam, air and gas.What is ANSI Class 1500 pressure rating? ›
If the temperature for Class 1 1500# flange is 300 degrees Fahrenheit, the maximum pressure for flanges is 3270 psi. If the temperature for Class 1 1500# flange is 400 degrees Fahrenheit, the maximum pressure for flanges is 3170 psi.
Choosing a Pump: ANSI or API? In general, ANSI pumps provide reliable service across a range of applications and are the pump of choice for chemical processing. They offer tremendous flexibility and ease of operation. API pumps are heavier duty and should be considered for higher pressure and temperature applications.What is ANSI class flange rating? ›
ANSI FLANGE PRESSURE RATING EXPLAINED
Pressure rating is defined as the maximum allowed pressure that a flange can withstand at increasing temperatures. According to the ANSI/ASME B16. 5 specification, there are seven flange pressure ratings: 150, 300, 400, 600, 900, 1500, and 2500.
The ASME - American Society of Mechanical Engineers - ASME/ANSI B16 Standards covers pipes and fittings in cast iron , cast bronze, wrought copper and steel.