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Donadon SDD manufactures metal and composite rupture discs according to norm EN ISO 4126-2. Available models are recommended for use with liquids and gases under static, cyclic or pulsating conditions.
Donadon discs are also recommended for protection of pressure relief valves.
Installation may be in disc holders, directly between flanges, or on threaded fittings.
Standard range covers diameters from ½” to 400”, rupture pressures from 0,01 to 4000 bar, operating temperatures from -196 to + 450°C.
Standard materials are Stainless Steel, Aluminium, Nickel, Monel, Inconel, Hastelloy; membranes are available in PTFE or metal.
Accessories like vacuum supports, linings, calibration rings, rupture indicators and manometers are also available.
Donadon SDD is glad to address special requirements and to develop designs in collaboration with customers
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Specialists in rupture discs (rupture disks), bursting discs and the isolation of pressure relieve valves, Fike has nearly 60 years of experience in understanding pressure relief systems. Fike has specific rupture disc products for different applications, rupture isolation procedures for pressure relief valves (safety relief valves), rupture disc calculation tools and rupture disc accessories and holders.
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There are various different types of signalling systems to deliver a feed back from the responding bursting disc. There are integrated or refit as well as seperate and individual models.
The basic principle is an intrinsically safe low voltage power circuit that is interrupted when the disc responds. The interruption is caused by tearing a smart wire or thin foil apart or by breaking a special detection pin. This signal can be implemented into the local control panel, monitoring system or just trigger an alert or alarm device. In connection with purpose designed monitoring units and separation amplifiers the use of such signalling devices and membranes is suitable for hazardous areas (Ex).
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Donadon offers a wide range of rupture indicators based on different technologies (electric, magnetic, optical, and inductive) in order to satisfy the requirements of all applications of rupture discs and explosion venting panels
• SVT/AT: electric for rupture discs
• IRP: electric for explosion venting panels
• NAM 03/HT: magnetic
• NAM 05/AT: inductive
• OFI 04 e 07: optical
The rupture indicators detect the bursting of the disc or panel and is connected to the plant’s safety system, allow timely actions
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Donadon SU rupture disc is a sealed unit formed by a conventional disc with solid calibrated section mounted in a threaded connector.
This unit has been designed in order to make easy and reliable mounting small discs in plant environment and to simplify the handling without need of specialized manpower.
SU disc is suitable for use with gases and liquids in static or pulsating conditions.
It reacts to over-pressure in a few thousands of a second and is recommended for protection of plants, equipments and containers.
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The Y90 DONADON rupture disc is a compression (or reverse) disc peripherally scored.
The Y90 represents the high technology in the sector: the camber of the convex disc is not modified by the operating pressure except on reaching reverse pressure. Therefore this device works with ratios of up to 90% between operating and rupture pressure and withstands thousands of cycles without jeopardising its reliability.
At the moment of reversion the disc bursts in a few thousands of a second rupturing along the scored line without fragments
Y90 disc has lower sensitivity to variations in temperature than conventional discs and therefore is very useful in applications with large temperature variations.
It is especially suitable for use with gas and liquids, and for protecting pressure relief valves
The wide choice of materials and the thickness used make the Y90 disc very resistant to corrosion. Greater protection can be obtained with a PTFE lining, which can be applied to the process side of the disc.
Vacuum support is normally not required
Available in special execution certified Ex II 2GD according to European Directive 94/9/CE (ATEX)
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Donadon SCD is a compression (or reverse) disc with micro-scored calibrated section. Special feature of SCD is scoring in 6 sectors instead of 4 as usual in all competitors’ discs.
Opening in 6 petals allows a better opening reducing the risk of petal detachment even at high bursting pressure.
It is used with gas and liquids also in cycling and pulsating conditions without reduction of safety margins.
SCR disc reacts to excessive pressure in a few milliseconds without fragmentation.
It is especially suited for protection of pressure relief valves.
SCR disc may operate at 90% of the bursting pressure and has a very good resistance to corrosion due to the thickness of the material employed. Corrosion resistance may be additionally improved by PTFE lining.
Vacuum support is normally not required.
Available in special execution certified Ex II 2GD according to European Directive 94/9/CE (ATEX).
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Graphite discs are very resistant to aggressive fluids, even at high temperature.
Bursting pressure has low sensitivity to temperature variations.
Graphite discs are made of high purity graphite impregnated with phenolic resins in order to make the product non porous
Opening is total but with fragmentation.
Donadon SDD supply three graphite disc models:
• GA type, a graphite rupture disc mounted on a Stainless steel (or other metal) ring that may be directly inserted between flanges. This disc is very versatile because has both the robustness of a metal holder and the performance of a graphite disc.
• GR type, a graphite rupture disc mounted on a graphite or metal holder. This disc is economic and versatile.
GM type, a monoblock graphite rupture disc that may be directly inserted between flanges.
Vacuum support is required for rupture pressures below 1.7 barg. At higher calibrations the disc is self-supporting.
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Donadon LPD rupture disc is a composite conventional disc formed by four parts:
• A slotted, perforated metal part
• A seal membrane (usually in PTFE)
• A protection section
• A calibration ring with blades to improve membrane opening
Designed to protect processing and storage tanks, atmospheric vessels and silos against implosion or overpressure conditions.
It reacts to over-pressure in a few thousands of a second with total opening and without fragmentation.
LPD discs are a simple, reliable, accurate and economical solution for applications requiring extremely low positive and/or negative pressure protection.
Their primary use is in storage tanks with low design pressures in applications where contamination is unacceptable.
Donadon SDD model LPD discs offer non-fragmenting opening and avoid product contamination.
LPD discs may be installed directly between flanges avoiding the requirement for holders with blades and can be offered to meet a broad range of non standard specifications and applications.
LPD discs can be provided with:
• Dual protection (vacuum / pressure)
• Vacuum / counterpressure support
• Burst detector, ATEX approved, giving immediate indication of burst occurrence
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Donadon SCD is a concave rupture disc with micro-scored calibrated section. Special feature of SCD is scoring in 6 sectors instead of 4 as usual in all competitors’ discs.
Opening in 6 petals allows a better opening reducing the risk of petal detachment even at high bursting pressure.
It is used with gas and liquids also in cycling and pulsating conditions without reduction of safety margins.
SCD disc reacts to excessive pressure in a few milliseconds without fragmentation.
It is especially suited for protection of pressure relief valves.
SCD disc may operate at 85% of the bursting pressure and has a very good resistance to corrosion due to the thickness pf the material employed. Corrosion resistance may be additionally improved by PTFE lining.
Vacuum support is normally not required.
Available in special execution certified Ex II 2GD according to European Directive 94/9/CE (ATEX).
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