Scored Graphite Rupture Disc
Product Model: ZD-G02 (Scored, Controlled-Opening Type)
Material: Impervious Graphite with precision-machined score lines.
Design: Features a pre-weakened pattern (e.g., cross, star) on one face.
Opening Characteristic: Opens along score lines into retained "petals," minimizing downstream debris.
Pressure Range: Low to medium, typically 0.2 barg to 6.0 barg.
Primary Use: Corrosive service where fragment generation is unacceptable, such as before sensitive valves, scrubbers, or in interconnected systems.
Overview
When the exceptional corrosion resistance of graphite is needed, but the release of fragments into the downstream system poses a risk of equipment damage or plugging, the scored graphite rupture disc is the ideal choice. By incorporating precisely machined grooves into the disc, its burst is controlled. The disc opens like a flower, with the segments remaining attached to a central hub or the holder itself. This non-fragmenting operation protects downstream instrumentation, pumps, or reactor inlets while maintaining a full, open flow area for safe pressure relief in aggressive chemical environments.
Features & Benefits
Controlled, Non-Fragmenting Burst: Eliminates the hazard and cleanup associated with loose debris, protecting valuable downstream assets.
Maintains Full Corrosion Resistance: The impervious graphite body still provides complete resistance to the process media, identical to the plain disc.
Predictable Opening Pattern: Ensures consistent and calculable flow area after activation for reliable system design.
Wide Applicability: Perfect for venting reactors, columns, and tanks containing corrosive fluids where downstream piping integrity is important.
How It Works
Under pressure, stress concentrates at the tips of the precision score lines. When the burst pressure is reached, fracture initiates at these points and propagates cleanly along the scored paths. The disc separates into segments that remain loosely connected or are captured by a downstream retainer, creating a large, unobstructed opening without generating loose fragments.
Specifications (Descriptive)
Sizes range from DN40 to DN300. The addition of scoring allows for slightly higher burst pressure ratings compared to plain discs of the same diameter and thickness. For instance, a scored DN80 disc might handle pressures up to 4 barg. The depth and pattern of the scores are carefully calibrated for specific pressure ratings. Holders are similar to the plain type but may include features to help retain the opened petals.
Q&A
Q: How is the burst pressure accuracy for scored graphite discs?
A: While not as precise as metal discs, scored graphite discs offer good repeatability within a typical tolerance of ±10% of the set pressure. The scoring process is controlled to ensure consistent performance.
Q: Can a scored disc be used for liquid service?
A: Yes, the controlled opening mechanism works effectively with both gases and liquids. It is a suitable choice for relieving overpressure in corrosive liquid systems.
Q: What is the main drawback compared to a plain disc?
A: The manufacturing process is more complex, making scored discs generally more expensive than plain discs. Also, the minimum burst pressure achievable might be slightly higher due to the need for sufficient material strength around the scores.
About ZD Safety
We engineer for both safety and system protection. Our scored graphite discs deliver the best of both worlds: the unmatched corrosion resistance of graphite and the clean operation required for modern, interconnected process systems.
