Seals Eastern, Inc.

When you have invested in a high pressure gas re-injection project, the last thing you want is faulty seals shutting down your multi-million dollar investment. An unexpected lubricant or the introduction of corrosion inhibitors in the gas stream is all it takes to destroy a poorly formulated sealing compound. Likewise, an unexpected change in the gas composition, such as excessive carbon dioxide or hydrogen sulfide (sour gas) can cause dangerous problems. Seals Eastern formulates its high pressure seals for assurance against aggressive chemicals and gases while maintaining the ultimate mechanical properties in the seals. Our high pressure sealing compounds keep you and your customers out of trouble.

Rapid gas decompression ("RGD") in high-pressure applications can be a recipe for seal failure. In fact, elastomers have a predictable swelling response in high-pressure gases such as CNG (compressed natural gas), methane, carbon dioxide, and hydrogen sulfide (sour gas). The destructive consequences of this swelling is not so much during the absorption of the gas but when the system pressure is suddenly relieved. In the phenomena of explosive decompression ("ED"), the gas absorbed by the polymer expands rapidly within the polymer upon the release of ambient pressure. The consequences to a seal can be catastrophic failure. Such failure can occur in gas compressors, down-hole applications, and other situations where high pressure is commonly encountered. Since the 1980s, Seals Eastern has supplied rapid gas decompression resistant seals to major manufacturers of turbine driven compressors, gas re-injection equipment, pumps, and other fabricators who must mitigate the effects of high-pressure gases in their equipment.

High pressure differentials across seal glands in your equipment can cause low modulus rubber seals to extrude into the clearance between mating surfaces. Extrusion resistant rubber is essential for trouble-free sealing when your equipment operates with high pressure differentials and clearance gaps exceeding press-fit dimensions. Seals Eastern's RGD resistant materials are highly extrusion resistant within their respective polymer types.

Technical Paper Downloads on High Pressure Sealing by Seals Eastern

• Sealing High Pressures under Sour Conditions
• The Hidden Cause of Seal Failure
• Elastomers in the Hot Sour Gas Environment

Rapid Gas Decompression Resistant Compounds by Seals Eastern

ASTM  D1418	Compound No.	Shore-A Hardness	Description
EPDM	7204	90	Y267-Type EPDM for geothermal steam service; Ultra-Low compression set
FKM	7248	95	RGD / ED resistant FKM rubber: ISO-23936-2 certified; Extrusion resistant
FEPM	7182D	80	Formulated AFLAS® high-temperature "sour" oil & gas service. RGD / ED resistant. Excellent acid and base resistance
FEPM	7182B	90	Formulated AFLAS® high-temperature, high-pressure carbon dioxide and "sour" oil & gas service; RGD / ED resistant: NORSOK M-710 certified; Excellent acid and base resistance
FEPM	7182A	95	Formulated AFLAS® high-temperature, high-pressure carbon dioxide and "sour" oil & gas service; ED / RGD resistant; Excellent acid and base resistance

ED Performance of 7182B and 7182D - NORSOK rating

D1418	Compound	Thickness	5000 PSI @ 120°C	11,700 PSI @ 60°C	11,700 PSI @ 120°C
FEPM	7182D	.210	0000, 0000	0000, 0000	0000, 0000
FEPM	7182B	.210	0000, 0000		0000, 0000
FEPM	7182B	.139	0000, 0000		0000, 0000

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