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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Risk-Based Pump Seal Selection Guideline Complementing ISO /API
Non-hydrocarbons Non-flashing hydrocarbons Flashing hydrocarbons. Each has a temperature range: Annex F — Mechanical seal data sheets One set of datasheets covers Category 1 and 2 seals. The last position defines the piping plan s and is designated by the two-digit piping plan number.
There are three recommended seal 2049.
The API standard was originally published in as a guide to selecting seals in the petroleum industry. Cast seal glands still require testing. Here are some of the highlights of this standard: If more than one plan is required such as on dual sealsthe additional plans are added to the end of the code.
Liquid buffer fluid Dual contacting wet seals. It may also be used on liquid or mixed phase applications. Categories Pumps and seals Posted On The second position defines the arrangement and is designated as A1, A2, or A3.
All dimensions ios in SI units with the US customary units given in parentheses. Here are the recommended metal components: The recommended elastomers Secondary seals: Here are the recommended metal components:.
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. Recommended seal selection procedures that are broken down into three process fluids: These datasheets are provided in both SI and U. Mc Nally Institute menu O-ring selection Troubleshooting Section Technical paper index Pump and seal cheat sheets Sealing ios index Troubleshooting index Charts and graphs index Most asked questions, 21094 Chemical listing guide Glossary index.
This design is used primarily on dual pressurized gas seals.
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. In the second and latter editions, there is an exemption for seal glands machined from a single piece of wrought material or bar stock. Category Pumps and seals. Standard flush plans and auxiliary hardware. There are three recommended seal categories: The third edition of the standard was finally published in February During testing, the seals must maintain a leakage rate of less than ppm as measured by EPA Method 21 or 5.
The third position defines the seal type and is designated as A, B, or C. In addition, the measured wear on the seal faces must be less than 1 percent of the available wear.
Thermosyphon Systems Api 682/Iso 21049 Bfs6000 Bfs 6000
That decision is left to the individual seal manufacturers. Here are two examples: 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.
This leakage criterion does not apply to testing of dual gas seals or containment seals under failure conditions.
Arrangement 3 Two seals per cartridge assembly with an externally supplied higher pressure barrier fluid between the seals. Another jso covers Category 3 seals.
Please note that this new standard does not cover the design of the seal components. Each has a pressure limit: There are many annexes that include references, calculation techniques, and tutorial information.