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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The third position defines the seal type and is designated as A, B, or C.
GSO ISO – Standards Store – GCC Standardization Organization
Please 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.
Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. Another set covers Category 3 seals. Posted On February 14, During testing, the seals must maintain a leakage rate of less than ppm as measured by EPA Method 21 or 5.
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The second position defines the arrangement and is designated as A1, A2, or A3. Categories Pumps and seals Posted On There are three recommended seal categories:.
That decision is left to the individual seal manufacturers. Here are 2109 examples: Each has a pressure limit: Arrangement 2 Two seals per cartridge assembly with an externally supplied lower pressure buffer fluid between the seals. In addition, the measured wear on the seal faces must be less than 1 percent of the available wear.
Cast seal glands still require testing. 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 iao Glossary index.
Recommended seal selection procedures that are broken down into three process fluids: The recommended elastomers Secondary seals: In the second and latter editions, there is an exemption 221049 seal glands machined from a single piece of wrought material or bar stock.
Here are the recommended metal components: Each has a temperature range: Seal hydrostatic testing Hydrostatic testing is required for the seal gland, all piping, reservoirs, and other auxiliary equipment sio to process fluids.
The third edition of the standard was finally published in February Here are the recommended metal components:. Arrangement 3 Two seals per cartridge assembly with an externally supplied higher pressure barrier fluid between the seals.
Standard flush plans and auxiliary hardware. The API standard was originally published in as a guide to selecting seals in the petroleum industry. The last position defines the piping 210449 s and is designated by the two-digit isoo plan number. Here are some of the highlights of this standard: Category Pumps and seals.
This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions. This design is used primarily on dual pressurized gas seals. All dimensions are in SI units with the US customary units given in parentheses.
These datasheets are provided in both SI and U. Annex F — Mechanical seal jso sheets One set of datasheets covers Category 1 and 2 seals.
Liquid buffer fluid Dual contacting wet seals.