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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These datasheets are provided in both SI and U. Here are the recommended metal components:. During testing, the seals must maintain a leakage rate of less than ppm as measured by EPA Method 21 or 5. The second position defines the arrangement and is designated as A1, A2, or A3.
API (3RD EDITION) AND ISO STANDARD – Mc Nally Institute
Each has a pressure limit: Liquid buffer fluid Dual contacting wet seals. The recommended elastomers Secondary seals: This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions.
The API standard was originally published in as a guide to selecting seals in the petroleum industry. There are many annexes that include references, calculation techniques, and tutorial information.
ISO – Pumps — Shaft sealing systems for centrifugal and rotary pumps
The third position defines the seal type and is designated as A, B, or C. Categories Pumps and seals Posted On 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 21409 atmosphere.
Standard flush plans and auxiliary hardware. If more than one plan 210049 required such as on dual sealsthe additional plans are added to the end of the code.
Here are two examples: Seal hydrostatic testing Hydrostatic testing is required for the seal gland, all piping, isoo, and other auxiliary equipment exposed to process fluids. Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. Please note that this new standard does not cover the design of the seal components. That decision is left to the individual seal manufacturers. Category Pumps and seals.
This design is used primarily on dual pressurized gas seals. Each has a temperature range: Another isi covers Category 3 seals. Here are the recommended metal components: The third edition of the standard was finally published in February Annex F — Mechanical seal data sheets One set of datasheets covers Category 1 and 2 seals. In the second and latter editions, there is an exemption for seal glands machined from a single piece of wrought 12049 or bar stock.
API 682 (3RD EDITION) AND ISO 21149 STANDARD
Arrangement 2 Two seals per cartridge assembly with an externally supplied 21409 pressure buffer fluid between the seals. It may also be used on liquid or mixed phase applications. 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.
Cast seal glands still require testing.
There are three recommended seal categories: In addition, the measured wear on the seal faces must be less than 1 percent of the available wear. All dimensions are in SI units with the US customary units given in parentheses.
Recommended seal selection procedures that are broken down into three process fluids: Arrangement 3 Two seals per cartridge assembly with an externally supplied higher pressure barrier fluid between the seals. The last position defines the piping plan s and is designated by the two-digit piping plan number. Posted On February 14, Here are some of the highlights of this standard: There are three recommended seal categories:.