Graphite Packing
Stem packing made from flexible graphite, offering wide temperature range (-200 degrees C to +550 degrees C), good chemical resistance, and self-lubricating properties. Standard for fire-safe and high-temperature applications. Achieves low fugitive emissions per ISO 15848.
Related Terms
Applicable Standards
Industrial Valves - Measurement, Test and Qualification Procedures for Fugitive Emissions - Part 1
ISO 15848-1 specifies measurement, test, and qualification procedures for fugitive emissions from industrial valves.
API 622 - Type Testing of Process Valve Packing for Fugitive Emissions
API 622 specifies type testing requirements for compression packing used in gate, globe, and other rising-stem valves to qualify packing sets for fugitive emissions service - complementing API 641 for ball valve stem seals.
Frequently Asked Questions
What is Graphite Packing used for in industrial valves?
Stem packing made from flexible graphite, offering wide temperature range (-200 degrees C to +550 degrees C), good chemical resistance, and self-lubricating properties. Standard for fire-safe and high-temperature applications. Achieves low fugitive emissions per ISO 15848.
When should I specify Graphite Packing for valve body or trim?
Graphite Packing is specified when the process fluid, temperature, or pressure requirements exceed what standard carbon steel (A216 WCB) or austenitic stainless steel (A351 CF8M) can handle. Material selection must consider corrosion rates, maximum and minimum design temperatures, and compliance with NACE MR0175 for sour service. Vajra Industrial Solutions can supply valves in Graphite Packing with full mill certificates.
Is Graphite Packing compatible with sour (H2S) service per NACE MR0175?
Material qualification for sour service (NACE MR0175 / ISO 15156) depends on the hardness limits, heat treatment condition, and UNS designation of the specific alloy. For H2S-containing service, the valve material order and PMI (positive material identification) must be verified against the applicable NACE material group. Contact Vajra Industrial Solutions for material recommendations specific to your H2S partial pressure and chloride conditions.
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