The DonadonSDD 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.
| Model | KRD |
| Materials | Stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy 625, Alloy C276, Titanium |
| Dimensions | DN 1”(25) – DN 36”(900) |
| Rupture pressure | 0,41 bar g (6 psi g)- 137 bar g (2000 psi g) (depending on material and diameter) |
| Kr l | 0.48 |
| Tolerance | from +/- 5 % to +/- 20% |
| Operating temperature | From – 196°C up to 480°C |
| Operating margin | 90% - Able to reach 95% depending on the conditions of service |
| Fragmentation | No |
| Use under valve | Yes |
| Corrosion resistance | Very good |
| Linings | Yes |
| Container | HR/A, HR/P, HR/F, HTC |
| Rupture sensor | Electrical, Magnetic, Inductive, Optical |
| ASME Certification [UD STAMP] | Available |
| PED Certification [CE STAMP] | Available |
| ATEX EX II 2 GD Certification | Available |
DonadonSDD SCD Rupture discs obtained with NS Nanoscored technology are discs with micro-scored calibrated sections opening in petals, characterised by the presence of 4, 6 or more radial scoring.
This allows for better opening reducing the risk of petal detachment. This makes DonadonSDD SCD rupture discs especially suitable at high bursting pressure. They are used with gas and liquids also in cycling and pulsating conditions without reduction of safety margins.
SCD discs react to excessive pressure in a few milliseconds without fragmentation.
They are especially suited for protection of pressure relief valves. DonadonSDD SCD rupture discs allow for a ratio between operating and bursting pressure up to 85% and have a very good resistance to corrosion. Corrosion resistance may be additionally improved with PTFE lining.
In addition, SCD discs can, in many cases, be subject to absolute vacuum conditions without need for supports.
| Model | SCD |
| Materials | Stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy 625, Alloy C276, Titanium |
| Dimensions | DN 1”(25) – DN 36”(900) |
| Rupture pressure | 2 bar g (30 psi g) - 413 bar g (6000 psi g) (depending on material and diameter) |
| KRgl | 1.33 |
| Tolerance | from +/- 5 % to +/- 20% |
| Operating temperature | From – 196°C up to 600°C |
| Operating margin | up to 85% |
| Fragmentation | No |
| Use under valve | Yes |
| Corrosion resistance | Very good |
| Linings | Yes |
| Container | HI/A, HI/P, HI/F, HTC |
| Rupture sensor | Electrical, Magnetic, Inductive, Optical |
| ASME Certification [UD STAMP] | Available |
| PED Certification [CE STAMP] | Available |
| ATEX EX II 2 GD Certification | Available |
DonadonSDD SCR Rupture discs obtained with NS Nanoscored technology are compression or reverse discs with micro-scored calibrated sections opening in petals, characterised by the presence of 4, 6 or more radial scoring.
This allows for better opening reducing the risk of petal detachment.
This makes DonadonSDD SCR rupture discs suitable both at high and at low bursting pressure and can be used only with gas and liquids (with the presence of a special gas cushion) also in cycling and pulsating conditions without reduction of safety margins.
SCR discs react to excessive pressure in a few milliseconds without fragmentation.
They are especially suited for protection of pressure relief valves.
DonadonSDD SCR Nanoscored rupture discs allow for a ratio between operating and bursting pressure up to 95% and have a very good resistance to corrosion. Corrosion resistance may be additionally improved with PTFE lining. In addition, SCR discs can be subject to absolute vacuum conditions without need for supports.
| Model | SCR |
| Materials | Stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy 625, Alloy C276, Titanium |
| Dimensions | DN 1”(25) – DN 36”(900) |
| Rupture pressure | 0,41 bar g (6 psi g)- 137 bar g (2000 psi g) (depending on material and diameter) |
| KRg | 0.48 |
| Tolerance | from +/- 5 % to +/- 20% |
| Operating temperature | From – 196°C up to 480°C |
| Operating margin | 90% - Able to reach 95% depending on the conditions of service |
| Fragmentation | No |
| Use under valve | Yes |
| Corrosion resistance | Very good |
| Linings | Yes |
| Container | HR/A, HR/P, HR/F, HTC |
| Rupture sensor | Electrical, Magnetic, Inductive, Optical |
| ASME Certification [UD STAMP] | Available |
| PED Certification [CE STAMP] | Available |
| ATEX EX II 2 GD Certification | Available |
The DonadonSDD Y90 rupture discs obtained with NS Nanoscored technology are compression or reverse circumference micro-scored discs.
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. Y90 discs have lower sensitivity to variations in temperature with respect to conventional discs and therefore are very useful in applications with large temperature variations.
They are especially suitable for use with gas and liquids (with the presence of a special gas cushion) and for protecting pressure relief valves. The wide choice of materials and the thickness used make Y90 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.
| Model | Y90 |
| Materials | Stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy 625, Alloy C276, Titanium |
| Dimensions | DN 1”(25) – DN 8”(200) |
| Rupture pressure | 0.2 - 70 bar g (depending on material and diameter) |
| Tolerance | from +/- 5 % to +/- 20% |
| Operating temperature | From – 196°C up to 600°C |
| Operating margin | 90% - Able to reach 95% depending on the conditions of service |
| Fragmentation | No |
| Use under valve | Yes |
| Corrosion resistance | Very good |
| Linings | Yes |
| Container | HR/A, HR/P, HR/F, HTC |
| Rupture sensor | Electrical, Magnetic, Inductive, Optical |
| PED Certification [CE STAMP] | Available |
| ATEX EX II 2 GD Certification | Available |