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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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. The third position defines the seal type and is designated as A, B, or C.

Here are the recommended metal components:. There are three recommended seal categories: The recommended elastomers Secondary seals: Arrangement 2 Two seals per cartridge assembly with an externally supplied lower pressure buffer fluid between the seals.


This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions. Liquid buffer fluid Dual contacting wet seals.


These datasheets are provided in both SI and U. Here are the recommended metal components: This design is used primarily on dual pressurized gas seals. Cast seal glands still require testing. Seal hydrostatic testing Hydrostatic testing is required for the seal gland, all piping, reservoirs, and other auxiliary equipment exposed to process fluids.

Risk-Based Pump Seal Selection Guideline Complementing ISO /API

In 21409, the measured wear on the seal faces must be less than 1 percent of the available wear. Each has a temperature range: There are many annexes that include references, calculation techniques, and tutorial information. The API standard was originally published in as a guide to selecting seals in the petroleum industry.

Annex F — Mechanical seal data sheets One set of datasheets covers Category 1 and 2 seals. During testing, the seals must maintain a leakage rate of less than ppm as measured by EPA Method 21 or 5. 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 second position defines the arrangement and is designated as A1, A2, or A3.

Here are some of the highlights of this standard: Posted On February 14, Recommended seal selection procedures 210499 are broken down into three process fluids: Each has a pressure limit: Category Pumps and seals. The third edition of the standard was finally published in February Arrangement 3 Two seals per cartridge assembly with an externally supplied 2049 pressure barrier fluid between the seals.


Standard flush plans and auxiliary hardware. That decision is left to the individual seal manufacturers.

Here are two examples: Categories Pumps and seals Posted On If more than one plan is required such as on dual sealsthe additional plans are added to the end of the code.

The last position defines the piping plan s and is designated by 20149 two-digit piping plan number.

It may also be used on liquid or mixed phase applications. Another set covers Category 3 seals. All dimensions are in SI units with the US customary units given in parentheses.

ISO 21049:2004

There are three recommended seal categories:. Please note that this new standard does not cover the design of the seal components.

Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. 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.