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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There are three recommended seal categories:. Here are the recommended metal components: Here are the recommended metal components:. Here are two examples: Recommended seal selection procedures that are broken down into three process fluids: Each has a temperature range: There are three recommended seal categories: Another set covers Category 3 seals.
Iiso note that this new standard does not cover the design of the seal components. The third position defines the seal type and is designated as A, B, or C.
If more than one plan is required such as on dual sealsthe additional plans are added to the end of the code. The recommended elastomers Secondary seals: In addition, the measured wear on the seal faces must be less than 1 percent of the available wear.
GSO ISO – Standards Store – GCC Standardization Organization
Arrangement 2 2149 seals per cartridge assembly with an externally supplied lower pressure buffer fluid between the seals. During testing, the seals must maintain a leakage rate of less than ppm as measured by EPA Method 21 or 5. All dimensions are in SI units with the US customary units given in parentheses. The last position defines the piping plan s and is designated by the two-digit piping plan number.
ISO – Pumps. Shaft sealing systems for centrifugal and rotary pumps
These datasheets are provided in both SI and U. Annex F — Mechanical seal data sheets One set of datasheets covers Category 1 and 2 seals. There are many annexes that include references, calculation techniques, and tutorial information.
Category Pumps and seals. Categories Pumps and seals Posted On 12049 Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. Arrangement 3 Two seals per cartridge assembly with an externally supplied higher pressure barrier fluid between the seals.
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.
It may also be used on liquid or mixed phase applications.
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Iiso buffer fluid Dual contacting wet seals. The third edition of the standard was finally published in February Cast seal glands still require testing.
Each has a pressure limit: Seal hydrostatic testing Hydrostatic testing is required for the seal gland, all piping, reservoirs, and other auxiliary equipment exposed to 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 iiso 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.
API 682 (3RD EDITION) AND ISO 21149 STANDARD
That decision is left to the individual seal manufacturers. This design is used primarily on dual pressurized gas seals. The API standard was originally published in as a guide to selecting seals in the petroleum industry.
Posted On February 14, Standard flush plans and auxiliary hardware. Here are some of the highlights sio this standard: This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions.
The second position defines the arrangement and is designated as A1, A2, or A3.