API 682 - Part 6 Seal Codes

American Petroleum Institute: Standard 682, 4th Edition Shaft Sealing Systems for Centrifugal and Rotary Pumps Part 6 – Seal Codes FSA Knowledge Series

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Abstract 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 seal coding system:

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Seal Description

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Design Options

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Seal Size

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Seal Support System

Disclaimer

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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.

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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.

Seal Code API-682 “Annex D”

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The mechanical seals code provides a concise way of referring to a design and features commonly supplied with seals

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Used with Annex C datasheet to specify purchasing requirements of mechanical seal and sealing systems ▪

Note: Assumes all standard defaults of mechanical seal designs

Seal Code Example: 31B-LIN-075-53A

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Seal Code Seal code has 8 positions broken down into 4 sections ▪ First section has 3 positions describing the seal ▪ Second section has 3 positions describing the design options ▪ Third section has 1 position describing the shaft size in mm ▪ Final section has 1 position describing the seal support plan Further information on each of these categories can be found in the Fluid Sealing Association’s Knowledgebase.

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Seal Code Section 1 describes the seal ▪ First position designates the seal category (1, 2, or 3). These categories are defined in API-682 section 4.1.2 ▪ Second position designates the seal arrangement (1, 2, or 3). These arrangements are defined in section 4.1.4 ▪ Third position designates the seal type (A, B, or C). These types are defined in section 4.1.3

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Seal Code Section 2 describes the seal's design options and consists of the 4th thru 6th code positions ▪ Position 4 designates the containment device found on the atmospheric side of the mechanical seal.

▪ Position 5 designates the secondary sealing element material ▪ Position 6 designates the seal face material combination

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Seal Code Position 4 designates the containment device type

P : Plain Gland L : Floating throttle bushing F : Fixed throttle bushing C : Containment seal S : Segmented Floating throttle bushing X : Unspecified, for options not covered by the standard options 9

Seal Code Position 5 designates the secondary sealing material

F : Fluorocarbon (FKM) elastomer gasket G : TFE spring energized gasket H : Nitrile elastomer gasket I : Perfluorocarbon (FFKM) elastomer gasket R : Flexible graphite X : Unspecified, for options not covered by the standard options 10

Seal Code Position 6 designates the seal face combination

M : Carbon vs. Nickel Tungsten-Carbide

R : Carbon vs. Silicon-Carbide

N : Carbon vs. Silicon-Carbide

S : Graphite Silicon-Carbide Composite vs. Silicon-Carbide

O : Silicon-Carbide vs. Nickel Tungsten-Carbide

T : Graphite Silicon-Carbide Composite vs. Silicon-Carbide

P : Silicon-Carbide vs. Silicon-Carbide

X : Unspecified, for options not covered by the standard options

Q : Silicon-Carbide vs. Silicon-Carbide

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Seal Code Section 3 describes the shaft size the seal cartridge will be installed on ▪ Section 3 consists of the 7th position of the seal code ▪ Shaft size is expressed millimeters ▪ Shaft size is rounded up and expressed in 3 digits 25 mm = 025 37.25 mm = 038

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Seal Code Section 4 describes the seal support systems ▪ Section 4 consists of the 8th position and describes the seal support piping plans that will be used on the seal installation.

▪ Piping plan descriptions are found in Annex G ▪ If more than 1 piping plan is used, the piping plans are listed with a forward slash "/" between them ▪ E.g.: A seal utilizing a plan 11 and a plan 53B is denoted as "11/53B"

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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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THANKS!

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