API 682 - Part 4 Design Requirements

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American Petroleum Institute: Standard 682, 4th Edition Shaft Sealing Systems for Centrifugal and Rotary Pumps Part 4

Design Requirements

DISCLAIMER

While the FSA makes every reasonable attempt to ensure that the information contained in this document is accurate and current, the FSA, its officers, directors, volunteers, and authorized agents are not responsible for any errors or omissions contained therein nor are they responsible for any results obtained from the use of or reliance upon its content. All information is provided “AS IS,” with no guarantee of completeness, accuracy, timeliness or of the results obtained, and without warranty of any kind, express or implied. In no event shall FSA or its officers, directors, volunteers, or authorized agents be liable to you or anyone else for any decision made or action taken in reliance on the information con tained herein or for any for any consequential, indirect, special, or similar damages, even if advised of the possibility of such damages. The informa tion contained in this document is for informational purposes only and does not constitute professional advice. It also includes references to certa in standards that may change over time and should be interpreted only in light of particular circumstances. It is your sole responsibility to confi rm the current state of any referred to standards. FSA reserves the right to modify or update the document content and to modify this Disclaimer at any t ime, effective upon posting of an updated version of this Disclaimer.

© (April, 2023), Fluid Sealing Association. All Rights Reserved.

This Fluid Sealing Association Knowledge Series training presentation introduces the American Petroleum Institute: Standard 682, 4th Edition. This is part of a series of presentations of this industry standard. This presentation describes API-682 design requirements: ▪ Multiport flush

Bushings

Secondary Seals

Reverse Pressure applications

Component clearances

▪ This FSA training material is made available for informational purposes only and is made available “AS IS.” It is intended to serve only as a summary of the content of the API-682 standard and not as a substitute for or to replace or supersede the actual language of the API standard.

▪ For the full language of the API-682 standard, please refer to the actual standard and/or refer to API’s website for further information: https://www.api.org/products-and-services/standards. FSA disclaims any and all liability for any injuries or damages to persons or property resulting from reliance upon this informational summary.

General Internal Design Practice

Multiport Flush

▪ Even distribution of fluid around the seal faces

▪ Reduces hot spots

▪ Reduces erosion concerns

General Internal Design Practice

Bushings (7.1.2.1)

Arrangement 1 seals

▪ Throttle bushings shall be positively retained against pressure blowout to minimize leakage if the seal fails.

▪ Typically constructed of Carbon

▪ Category 1 : Fixed

▪ Category 2 & 3: Floating

▪ Category 2 & 3: Optional Segmented Floating

General Internal Design Practice

Secondary Seals (6.1.6.5)

▪ Unless otherwise specified, O-rings shall be fluorocarbon (FKM)

▪ If chemical/temperature conditions preclude the use of fluorocarbons, perfluorocarbon (FFKM) shall be used unless otherwise specified

▪ If temperature/chemical conditions preclude the use of elastomers, flexible graphite shall be used

▪ Maximum secondary seal contacting surface roughness (Ra)

▪ Static: 1.6 µm [63 µinch]

▪ Dynamic: 0.8 µm [32 µinch]

▪ O-ring grooves shall be sized for perfluorocarbon (FFKM) O-rings

General Internal Design Practice

Component Containment

▪ For services where the seal chamber pressure can be below atmospheric or for arrangement 3 inner seal, all seal components shall be designed with a means of retaining the sealing components to prevent them from being dislodged by atmospheric or barrier pressure. (6.1.1.11)

Mechanical Retention

Hydraulic Retention

General Internal Design Practice

Component Clearances

▪ The minimum diametric clearance between rotary and stationary components shall be sufficient to prevent contact between parts in relative motion are defined in API-682 chapter 6.1.2.6 and Table 1.

Further Information

American Petroleum Institute Standard 682

For further information and detail please review the API 682 standards document.

Request a copy of the “API Std 682” from the API Publication

Store: https://www.apiwebstore.org/search/search.html?query=682

For more information, please visit https://www.api.org

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