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 last position defines the piping plan s and is designated by the two-digit piping plan number.
The API standard was originally published in as a guide to selecting seals in the petroleum industry. Posted On February 14, When the inner seal fails, the containment seal is designed to run under full seal chamber conditions for a minimum of eight 12049 and prevent or minimize process fluid leakage to atmosphere.
Another set covers Category 3 seals.
Thermosyphon Systems Api 682/Iso 21049 Bfs6000 Bfs 6000
Seal hydrostatic testing Hydrostatic testing is required for the seal gland, all piping, reservoirs, and 12049 auxiliary equipment exposed to process fluids. Is addition, the measured wear on the seal faces must be less than 1 percent of the available wear. 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.
Recommended seal selection procedures that are broken down into three process fluids: If more than one plan is required such as on dual sealsthe additional plans are added to the end of the code. There are three recommended seal categories: Standard flush plans and auxiliary hardware.
Risk-Based Pump Seal Selection Guideline Complementing ISO /API
All dimensions are in SI units 12049 the US customary units given in parentheses. Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions. It may also be used on liquid or mixed phase applications. The third position defines the seal type and is designated as A, B, or C.
There are three recommended seal categories:. During testing, the seals must maintain a leakage rate of less than ppm as measured by EPA Method 21 or 5. Cast seal glands still require testing.
Arrangement 3 Two seals per cartridge assembly with an externally supplied higher pressure barrier fluid between the seals.
МКС EN ISO 21049:2011
21409 2 Two seals per cartridge assembly with an externally supplied lower pressure buffer fluid between the seals. Here are the recommended metal components: Please note that this new standard does not cover the design of the seal components. Categories Pumps and seals Posted On The second position defines the arrangement and is designated as A1, A2, or A3.
Liquid buffer fluid Dual contacting wet seals.
This design is used primarily on dual pressurized gas seals. These datasheets are provided in both SI and U.
Each has a temperature range: There are many annexes that include references, calculation techniques, and tutorial information. In the second and latter editions, there is an exemption for seal glands machined from a single piece of wrought material or bar stock.
That decision is left to the individual seal manufacturers. The third edition of the standard was finally published in February Each has a pressure limit: Annex F — Mechanical seal data sheets One set of datasheets covers Category 1 and 2 seals.
Category Pumps and seals. Here are some of the highlights of this standard: Here are two examples: The recommended elastomers Secondary seals: