DONADON KRD Rupture Disc

Product catalog summary

Specifications:
The Donadon SDD KRD rupture discs are available in various materials including stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy C276, Titanium, and Tantalum. They come in dimensions ranging from DN 1” (25) to DN 36” (900) and can handle rupture pressures from 0.41 bar g (6 psi g) to 137 bar g (2000 psi g), depending on the material and diameter. The Kr l value is 0.48, with a tolerance range from +/- 5% to +/- 20%. Operating temperatures range from -196°C to 480°C, with an operating margin of 90%, potentially reaching 95% under certain conditions. The discs are non-fragmenting and can be used under valves, offering very good corrosion resistance and optional linings.

Procedures and Technology:
The KRD discs utilize NS Nanoscored technology, featuring compression or reverse circumference micro-scored designs. The convex disc's camber remains unchanged by operating pressure until reverse pressure is reached, allowing for high reliability over thousands of cycles. Upon reversion, the disc ruptures quickly along the scored line without fragments, ensuring full opening. These discs are less sensitive to temperature variations compared to conventional discs, making them ideal for applications with significant temperature changes.

Applications and Recommendations:
KRD discs are suitable for use with liquids only, in cycling and pulsating conditions without compromising safety margins. They are particularly effective for isolating safety valves. The discs' design and material options provide excellent corrosion resistance, with additional protection available through a PTFE lining on the process side. They do not require vacuum support and can withstand high counter-pressures.

Certifications:
The KRD rupture discs are ASME certified with a [UD STAMP].

Catalog excerpts

DONADON SDD KRD rupture discs The Donadon SDD KRD rupture discs obtained with NS Nanoscored technology are compression or reverse circumference micro-scored discs. KRD discs make use of the latest sector technology: the camber of the convex disc is not modified by the operating pressure except on reaching reverse pressure. This device works with ratios of up to 95% between operating and rupture pressure and withstands thousands of cycles without jeopardising its reliability. At the moment of reversion, the disc ruptures in a few thousandths of a second along the scored line without fragments and with full opening. KRD discs have lower sensitivity to variations in temperature with respect to conventional discs and therefore are very useful in applications with large temperature variations. Thanks to their innovative design, KRD discs can be used in the presence of liquids only, in cycling and pulsating conditions without reduction of safety margins. In addition, they are especially suitable for isolating safety valves. The wide choice of materials and the thickness used make KRD discs very resistant to corrosion. Greater protection can be obtained using a PTFE lining, which can be applied to the process side of the disc. Vacuum support is not required and they are able to resist high counter-pressures. Stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy C276, Titanium, Tantalum Rupture pressure 0,41 bar g (6 psi g)- 137 bar g (2000 psi g) (depending on material and diameter) Operating temperature Operating margin 90% - Able to reach 95% depending on the conditions of service Corrosion resistance Very good Rupture sensor Electrical, Magnetic, Inductive, Optical ASME Certification [UD STAMP]

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