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. There are ixo annexes that include references, calculation techniques, and tutorial information. The third position defines the seal type and is designated as A, B, or C.
API 682 (3RD EDITION) AND ISO 21149 STANDARD
Each has a pressure limit: The third edition of the standard was finally published in February Categories Pumps and seals Posted Isp These datasheets are provided in both SI and U. This design is used primarily on dual pressurized gas seals.
Here are the recommended metal components: Annex F — Mechanical seal data sheets One set of datasheets covers Category 1 and 2 seals. Standard flush plans and auxiliary hardware.
Each has a temperature range: Here are two examples: Arrangement 3 Two seals per cartridge assembly with an externally supplied higher pressure barrier fluid between the seals.
API (3RD EDITION) AND ISO STANDARD – Mc Nally Institute
The last position defines the piping plan s and is designated by the two-digit piping plan number. There are three recommended seal categories: Here are the recommended metal components:. Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. During testing, the seals must maintain a leakage rate of less than ppm as measured by EPA Method 21 or 5.
Please note that this new standard does not cover the design of the seal components. Here are some of the highlights of this standard: Recommended seal selection procedures that are broken down into three process fluids: 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.
In the second and latter editions, there is an exemption for seal glands machined from a single piece of wrought material or bar stock.
The recommended elastomers Secondary seals: That decision is left 21094 the individual seal manufacturers. If more than one plan is required such as on dual sealsthe additional plans are added to the end of the code.
All dimensions are in SI units with the US customary units given in parentheses.
There are three recommended seal categories:. In addition, the measured wear on the seal faces must be less than 1 percent of the available wear.
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Cast seal glands still require testing. It may also be used on liquid or mixed phase applications. Seal hydrostatic testing Hydrostatic testing is required for the seal gland, all piping, reservoirs, and other auxiliary equipment exposed to process fluids.
The API standard was originally published in as ios guide to selecting seals in the petroleum industry. 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. Arrangement 2 Two seals per cartridge assembly with an externally supplied lower pressure isso fluid 21094 the seals.
This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions. Posted On February 14, The second position defines the arrangement and is designated as A1, A2, or A3. Liquid buffer fluid Dual contacting wet seals.
Another set covers Category 3 seals.