Anti-Explosion Solution for O-Rings on Quick-Open Flanges of High-Pressure CO₂ Vessels
Prevent AED Failure During Depressurization
Quick-open flanges are widely used on high-pressure supercritical CO₂ extraction vessels to streamline material loading and unloading processes. However, they are also among the highest-risk structural components in the entire production system. The O-rings fitted on these quick-open flanges frequently suffer from bulging, cracking and bursting during depressurization, a typical fault known as Accelerated Explosive Decompression (AED) failure. This type of failure not only leads to frequent part replacement and increased operating costs, but also poses severe safety hazards, including medium splashing and uncontrolled pressure release during industrial production.
In most cases, AED-related O-ring damage is not caused by defective product quality. Instead, it results from the unique physical properties of high-pressure CO₂ fluid and non-standard pressure relief operations. When the system working pressure exceeds 35 MPa, CO₂ molecules easily penetrate the microscopic pores inside O-ring materials and remain stably trapped within the seal structure under constant high pressure. Once operators perform rapid manual depressurization, the external pressure of the seal drops instantly. The high-pressure CO₂ gas confined inside the O-ring cannot be released in a gradual and steady manner, which triggers sharp volume expansion and ultimately causes structural rupture of the sealing ring.
Frequent opening and closing of quick-open flanges further exacerbates material fatigue damage. Conventional sealing materials endure long-term alternating loads, including continuous high-pressure gas penetration and instantaneous pressure impact, which greatly accelerates material aging and structural damage. In actual production, many operation teams excessively speed up depressurization steps to improve production efficiency. This irregular operating habit is the leading human factor responsible for mass O-ring AED failure on CO₂ extraction equipment.
Two practical and effective solutions can fundamentally eliminate AED failure risks of flange O-rings. First, optimize the pressure relief process by implementing segmented slow depressurization. This method reserves sufficient time for the trapped internal gas inside O-rings to discharge slowly, thoroughly avoiding gas expansion and seal bursting caused by pressure difference. Second, adopt professional AED-resistant O-rings featuring a dense internal structure, ultra-low porosity and superior gas penetration resistance. These dedicated sealing accessories are specially customized to adapt to frequent high-pressure cyclic operation of supercritical CO₂ equipment. In addition, regular visual inspection for O-ring bulging, deformation and micro-cracks is essential to achieve early replacement and proactive risk prevention.
Strict regulation of depressurization rhythms and rational selection of professional anti-explosion sealing materials can completely resolve O-ring bursting failures on quick-open flanges, ensuring long-term stable, safe and reliable operation of high-pressure CO₂ extraction vessels.
If you have any procurement demands for supporting accessories of high-pressure extraction vessels or require customized AED explosion-proof optimization solutions, feel free to contact us via WhatsApp or email for one-on-one professional technical consultation and support.