To completely align API and ISO. , API Third Edition was issued in Since the publication of the Third Edition, seal technology has continued. APIs recent release of Standard Second Edition and the pending release of API Third Edition and ISO represent a major revision to this standard. ISO was finally published in February This article summarizes the development and changes in the 2nd Edition API until its launch in
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The API standard was originally published in as 2149 guide to selecting seals in the petroleum industry. Here are some of the highlights of this standard: There are three recommended seal categories:. Here are the recommended metal components:. Arrangement 2 Two seals per cartridge assembly with an externally supplied lower pressure buffer fluid between the seals.
Risk-Based Pump Seal Selection Guideline Complementing ISO /API
Arrangement 3 Two seals per cartridge assembly with an externally supplied higher pressure barrier fluid between the seals.
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Categories Pumps and seals Posted On The third edition of the standard was finally published in February All dimensions are in SI units with the US customary units given in parentheses.
Please note that this new standard does not cover the design of the seal components. That decision is left to the individual seal manufacturers. There are three recommended seal categories: Each has a temperature range: Each has a pressure limit: Here are the recommended metal components: The recommended elastomers Secondary seals: When the inner seal fails, the containment seal is designed to run under full seal chamber conditions for a minimum of eight hours and prevent or minimize process fluid leakage to atmosphere.
This design is used primarily on dual pressurized gas seals. It may also be used on liquid or mixed phase applications.
API (3RD EDITION) AND ISO STANDARD – Mc Nally Institute
Liquid buffer fluid Dual contacting wet seals. During testing, the seals must maintain a leakage rate of less than ppm as measured by EPA Method 21 or 5. This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions.
In addition, the measured wear on the seal faces must be less than 1 percent of the available wear. Seal hydrostatic testing Hydrostatic testing is required for the seal gland, all piping, reservoirs, and other auxiliary equipment exposed to process fluids.
In the second and latter editions, there is an exemption for seal glands machined from a single 2049 of wrought material or bar stock. Cast seal glands still require testing.
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There are many annexes that include references, calculation techniques, and tutorial information. Here are two examples: Annex F — Mechanical seal data sheets One set of datasheets covers Category 1 and 2 seals.
Another set covers Category 3 seals. These datasheets are provided in both SI and U.
МКС EN ISO 21049:2011
The second position defines the arrangement and is designated as A1, A2, or A3. The third position defines the seal type and is designated as A, B, or C. The last position defines the piping plan s and is designated by the two-digit piping plan number.
If more than one plan is required such as on dual sealsthe additional plans are added to the end of the code. Recommended seal selection procedures that are broken down into three process fluids: Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. Standard flush plans and auxiliary hardware. Category Pumps and seals.
Posted On February 14,