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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Cast seal glands still require testing.
The last position defines the piping plan s and is designated by the two-digit piping plan number. Here are some of the highlights of this standard: All dimensions are in SI units with the US customary units given in parentheses.
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Arrangement 3 Two seals per cartridge assembly with an externally supplied higher pressure barrier fluid between the seals. Another set covers Category 3 seals. This design is used primarily on dual pressurized gas seals. There are three recommended seal categories: 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. There are three recommended seal categories:. Each has a temperature range: The third position defines the seal type and is designated as A, B, or C. Arrangement 2 Two seals per cartridge assembly with an externally supplied lower pressure buffer fluid between the seals.
The API standard was originally published in as a guide to selecting seals in the petroleum industry. 210049 note that this new standard does not cover the design of the seal components.
It may also be used on liquid or mixed phase applications. Liquid buffer fluid Dual contacting wet seals.
API (3RD EDITION) AND ISO STANDARD – Mc Nally Institute
That decision is left to the individual seal manufacturers. If more than one plan is required such as on dual sealsthe additional plans are added iao the end of the code.
Here are the recommended metal components: Category Pumps and seals. Each has a pressure limit: Recommended seal selection procedures that are broken down into three process fluids: There are many annexes that include references, calculation techniques, and tutorial information.
Posted On February 14, Here are two examples: These datasheets are provided in both SI and U. Categories Pumps and seals Posted On Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. Seal hydrostatic testing Hydrostatic testing is required for the seal gland, all piping, reservoirs, and other auxiliary equipment exposed to process fluids. The recommended elastomers Secondary seals: 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.
Annex F — Mechanical seal data sheets One set of datasheets covers Category 1 and 2 seals. In the second and latter editions, there is an exemption for seal glands machined from a single piece of wrought material or bar stock. In addition, the measured wear on the seal faces must be less than 1 percent of the available wear.
During testing, the seals must maintain a leakage rate of less than ppm as measured by EPA Method 21 or 5. The third edition of the standard was finally published in February This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions.
Standard flush plans and auxiliary hardware.