Seals for hyperbaric pressure vessels and chambers
When invisible details define safety, lifetime, and cost
In hyperbaric pressure vessels and chambers, seals are among the most critical components. They are rarely visible during operation, yet the consequences of incorrect material selection or insufficient specification can be severe. High pressure, large diameters, and demanding media place unique requirements on both seal design and documentation.
Hyperbaric pressure challenges more than seal geometry
Hyperbaric applications expose seals to combinations of pressure, temperature, and media that often exceed standard qualification envelopes. In such environments, specifying a generic “approved” seal or a “NORSOK-approved material” is rarely sufficient. Without precise requirements, there is a risk of paying for properties that are not needed — or selecting a solution that does not match actual operating conditions.
Large diameters and high pressure require structural support
Hyperbaric vessels and chambers often involve large seal diameters, high pressure levels, and relatively large extrusion gaps. This increases the risk of extrusion, where the seal material is forced out of the groove. In such cases, backup rings, for example in PEEK, play a key role in stabilising the seal and extending service life. These solutions are developed specifically for high pressure and large extrusion gaps.
Geometry designed for assembly and re‑assembly
Seal performance in hyperbaric applications is not only about pressure resistance. Seal geometry can be optimised with both assembly and re‑assembly in mind, allowing the vessel to be opened and closed without replacing the seals every time. This applies to solutions with and without backup rings, and helps reduce downtime, maintenance effort, and lifetime cost — without compromising sealing integrity.
Hyperbaric applications vary widely, including:
- Test chambers and autoclaves
- Pressure vessels
- Industrial systems handling gases, liquids, or aggressive chemicals
What they all have in common is that small assumptions made during the specification phase can have significant consequences during operation. Questioning material choice, test basis, and seal geometry early is often a sound investment.
Better decisions start with better questions seals for hyperbaric pressure vessels and chambers are not just about withstanding pressure. They are about understanding the interaction between material, geometry, media, and real operating conditions. When requirements are clearly defined, the result is more reliable performance and lower lifetime cost.
