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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Here are the recommended metal components:. If more than one plan is required such as on dual sealsthe additional plans are added to the end of the code.
The third edition of the standard was finally published in February Categories Pumps and seals Posted On There are three recommended seal categories: 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.
Each has a pressure limit: The second position defines the arrangement and is designated as A1, A2, or A3. The API standard was ido published in as a guide to selecting seals in the petroleum industry.
This design is used primarily on dual pressurized gas seals.
That decision is left to the individual seal manufacturers. The third position defines the seal type and is designated as A, B, or C.
Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. Here are some of the highlights of this standard: It may also be used on liquid or mixed phase applications. Standard flush plans and auxiliary hardware. Category Pumps and seals.
There are many annexes that include references, calculation techniques, and tutorial information. In addition, the measured wear on the seal faces must be less than 1 percent of the available wear. The last position defines the piping plan s and is designated by the two-digit piping plan number. Please note that this new standard does not cover the design of the seal components. The recommended elastomers Secondary seals: Each has a temperature range: In the second and latter editions, there is an exemption for seal glands machined from a single piece of wrought material or bar stock.
These datasheets are provided in both SI and U. Arrangement 3 Two seals per cartridge assembly with an externally supplied higher pressure barrier fluid between the seals. Another set covers Category 3 seals. Posted On February 14, This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions.
Arrangement 2 Two seals per cartridge assembly with an externally supplied lower pressure buffer fluid between the seals.
Seal hydrostatic testing Hydrostatic testing is required for the seal gland, all piping, reservoirs, and other auxiliary equipment exposed to process fluids.
Annex F — Mechanical seal data sheets One set of datasheets covers Category 1 and 2 seals. Recommended seal selection procedures that are broken down into three process fluids: Cast seal glands still require testing.
Here are the recommended metal components: 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 listing guide Glossary index.
Liquid buffer fluid Dual contacting wet seals. All dimensions are in SI 210499 with the US customary units given in parentheses. There are three recommended seal categories:.