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: The third position defines the seal type and is designated as A, B, or C.
When the inner seal fails, the containment seal is designed to run under full ieo chamber conditions for a minimum of eight hours and prevent or minimize process fluid leakage to atmosphere. Another set covers Category 3 seals.
This design is used primarily on dual pressurized gas seals. This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions.
Seal hydrostatic testing Hydrostatic testing is required for the seal gland, all piping, reservoirs, and other auxiliary equipment exposed to process fluids. Recommended seal selection procedures that are broken down into three process fluids: Here are some of the highlights of ixo standard: Posted On February 14, All dimensions are in SI units with the US customary units given in parentheses.
Liquid buffer fluid Dual contacting wet seals. That decision is left to the individual seal manufacturers. The Io standard was originally published in as a guide to selecting seals in the petroleum industry. Categories Pumps and seals Posted On Here are two examples: Arrangement 2 Two seals per cartridge assembly with an externally supplied lower pressure buffer fluid between the seals.
Please note that this new standard does not cover the design of 210049 seal components.
Risk-Based Pump Seal Selection Guideline Complementing ISO /API
It isp also be used on liquid or mixed phase applications. Standard flush plans and auxiliary hardware. Here are the recommended metal components:. The second position defines the arrangement and is designated as A1, A2, or A3.
During testing, the seals must maintain a leakage rate of less than ppm as measured by EPA Method 21 or 5. Each has a pressure limit: 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: The third edition of the standard was finally published in February Cast seal glands still require testing. There are three recommended seal categories: Category Pumps and seals. 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
There are many annexes that include references, calculation techniques, and tutorial information. There are three recommended seal categories:. Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. Each has a temperature range: In addition, the measured wear on the seal faces must be less than 1 percent of the available wear.
API 682 (3RD EDITION) AND ISO 21149 STANDARD
The last position defines the piping plan s and is designated by the two-digit piping plan number. Annex F — Mechanical seal data sheets One set of datasheets covers Category 1 and 2 seals.
These datasheets are provided in both SI and U. If more than one plan is required ieo as on dual sealsthe additional plans are added to the end of the code. 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.