Fugitive Emission ISO 15848 — Stem Sealing Classes for Process Valves
ISO 15848 defines fugitive emission type testing for industrial valves. Buyers specifying FE-rated valves should name the ISO 15848 class and whether a type-test certificate is required — not only “low emission packing.”
Quick selection
ISO 15848 = valve FE type test classes. API 622 = packing material qualification. See ISO 15848 vs API 622.
Comparison table
| Factor | ISO 15848 focus | Related but different |
|---|---|---|
| Scope | Valve FE type testing / classification | API 622 packing qualification |
| What you get | Tightness class + endurance class | Packing brand/material data |
| Typical drivers | Refining, chemical, environmental limits | Packing selection for FE builds |
| Bellows option | Bellows-seal for near-zero stem leak paths | Packed gland with FE packing |
| Docs | Type-test certificate / FE class | Packing MTC + FE valve certificate if claimed |
| Buyer action | Name ISO 15848 class + edition | Do not write only “fugitive emission packing” |
Packed gland vs bellows-seal
For critical toxic media, bellows-seal globe/gate may be preferred. FE packing still needs correct installation.
- Confirm type test vs site leak check only.
- Graphite vs PTFE packing depends on temperature and media.
- Actuated valves: include stem seal under cyclic duty.
RFQ wording that works
- “Globe / gate / ball with stem sealing to ISO 15848 (class __), type-test certificate required.”
- Or: “Bellows-seal globe, SS316, Class 300, FE critical service.”
FAQ
Is ISO 15848 the same as API 622?
No. API 622 qualifies packing. ISO 15848 type-tests valves for fugitive emissions.
Does fire-safe equal low emission?
No. Fire-safe and FE are separate requirements.
Do all valves need ISO 15848?
Only when the project requires FE classification.
Can soft-seat ball valves be FE rated?
Stem sealing is the FE path; seat type is separate.
Related RFQs and hubs
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