Pre-Scored Flat Rupture Disc
Product Model: ZD-FL02 (Scored Flat Disc)
Material: 316 Stainless Steel, Hastelloy, Inconel.
Design: Flat membrane with laser or chemically etched score lines in a precise pattern (e.g., cross, circle).
Opening Characteristic: Opens along score lines into retained petals, minimizing loose debris.
Pressure Range: 0.2 barg to 25 barg.
Primary Use: Applications requiring a low-cost, non-fragmenting solution for gas or liquid service, such as before pumps, in instrument air lines, or on general process vessels.
Overview
The pre-scored flat rupture disc upgrades the basic flat disc by adding control. Precision score lines are etched into the flat membrane to dictate exactly where it will tear. This controlled failure mode causes the disc to open into several petals that remain attached at the edges, significantly reducing or eliminating loose fragments. This offers a more refined solution than a standard flat disc at a cost often lower than domed reverse-acting types, making it a popular choice for general industrial protection where downstream debris is a concern.
Features & Benefits
Controlled, Cleaner Opening: Pre-defined score lines guide the rupture, retaining most material and reducing downstream contamination risk.
Cost-Effective Non-Fragmenting Option: Provides a middle-ground between fragmenting flat discs and more expensive reverse-acting discs.
Suitable for Liquids & Gases: The tensile rupture mechanism works well for both compressible and incompressible fluids.
Predictable Performance: Scoring allows for more consistent burst pressures and opening areas compared to an unscored flat disc.
How It Works
Under pressure, stress concentrates at the tips of the score lines, which are the thinnest sections. 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 connected to the outer rim, creating a large, predictable opening.
Specifications (Descriptive)
Sizes range from DN25 to DN300. The scoring allows for a wider pressure range than unscored flat discs. For example, a scored DN80 disc can be rated from 1 to 16 barg. The score depth and pattern are carefully calibrated for specific pressures. Materials include 316L SS for general use and Hastelloy C276 for corrosion resistance. Tolerance is typically ±5%.
Q&A
Q: Is it truly "non-fragmenting"?
A: It is "low-fragmenting" or "controlled fragmenting." Small fragments from the score intersections may detach, but the main petal structure is retained. For applications requiring zero fragments, a reverse-acting disc is the guaranteed choice.
Q: Can it handle cyclic pressure?
A: It has better fatigue resistance than an unscored flat disc but is generally not as good as a reverse-acting disc. For severe cyclic service, a reverse-acting model is recommended.
Q: How do you prevent the petals from blocking the outlet?
A: The petal design is engineered to fold back against the holder wall, presenting minimal flow obstruction. The full cross-sectional area of the nozzle is effectively opened.
About ZD Safety
We believe in smart, economical design. Our pre-scored flat discs deliver enhanced safety performance—controlled opening, reduced debris—at a price point that makes them a versatile and practical choice for a wide array of industrial protection needs.
