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