API 682 (3rd edition) and ISO 21149 Standard (18-8)

The API 682 standard was originally published in 1994 as a guide to selecting seals in the petroleum industry.

Here are some of the highlights of this standard:
There are three recommended seal categories:

Each has a temperature range:

Each has a pressure limit:

There are some differences in the face materials*:

*For seals requiring two hard faces the default material for both faces is silicon carbide.
Here are the recommended metal components:

The recommended elastomers (Secondary seals):

The mechanical seal designs are divided into several types:

Seal arrangements:

Arrangement #1
One seal per cartridge assembly

Arrangement #2
Two seals per cartridge assembly with an externally supplied lower pressure buffer fluid between the seals.

 

Arrangement #3
Two seals per cartridge assembly with an externally supplied higher pressure barrier fluid between the seals

The standard also covers:

You should get a copy of these standards to learn how they’ll affect your plant.

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