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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Category Pumps and seals. Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. 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.
In addition, the measured wear on the seal faces must be less than 1 percent of the available wear. Here are the recommended metal components:. 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. Posted On February 14, Arrangement 3 Two seals per cartridge assembly with an externally supplied higher pressure barrier fluid between the seals.
During testing, the seals must maintain a leakage rate of less than ppm as measured by EPA Method 21 or 5. Standard flush plans and auxiliary hardware. Here ios some of the highlights of this standard: Mc Nally Institute menu O-ring selection Troubleshooting Section Technical paper index Pump and seal cheat sheets Sealing chemicals index Troubleshooting index Charts and graphs index Most asked questions, seals Chemical iao guide Glossary index.
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Cast seal glands still require testing. The last position defines the piping plan s and is designated by the two-digit piping plan number. The third edition of the standard was finally published in February Another set covers Category 3 seals.
Annex F — Mechanical isp data sheets One set of datasheets covers Category 1 and 2 seals. It may also be used on liquid or mixed phase applications.
The recommended elastomers Secondary seals: This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions. There are many annexes that include references, calculation techniques, and tutorial information. Here are the recommended metal components: In the second ido latter editions, there is an exemption for seal glands machined from a single piece of wrought material or bar stock.
Arrangement 2 Two seals per cartridge assembly with an externally supplied lower pressure buffer fluid between the seals. If more than one plan is required such as on dual sealsthe additional plans are added to the end of the code.
Please note that this new standard does not cover the design of the seal components. That decision is left to the individual seal manufacturers. Categories Pumps and seals Posted On Each has a pressure limit: Recommended seal selection procedures that are broken down into three process fluids: The API standard was originally published in as a guide to selecting seals in the petroleum industry.
These datasheets are provided in both SI and U. There are three recommended seal categories:. Liquid buffer fluid Dual contacting wet seals. All dimensions are in SI units with the US customary units given in parentheses. Each has a temperature range: This design is used primarily on dual pressurized gas seals.
There are three recommended seal categories: