DonadonSDD DCD rupture discs are composite conventional discs formed by three parts:
a slotted, perforated metal part
a seal membrane (usually in PTFE but also available in many other metallic or non-metallic materials)
a protection section
It is excellent for use with gas and liquids in static conditions and excellent for low pressures.
DCD discs react to excessive pressure with total opening in a few milliseconds without fragmentation. They are therefore recommended for valve protection. Supports may be provided for vacuum or counter-pressure protection.
Composite DonadonSDD rupture discs may also be used for simultaneous protection from pressure and vacuum.
| Model | DCD |
| Materials | Stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy 625, Alloy C276, Titanium |
| Membrane | PTFE, PFA, Stainless steel, Aluminium |
| Dimensions | DN ½”(15) – DN 40”(1000) |
| Rupture pressure | 0.01 - 110 bar g (depending on material and diameter) |
| Tolerance | from +/- 5 % to +/- 20% |
| Operating temperature | membrane in PTFE/PFA max 265°C, up to 480°C (depending on the membrane) |
| Operating margin | up to 80% |
| Vacuum support | Available |
| Fragmentation | No (membrane only) |
| Use under valve | Yes |
| Corrosion resistance | Good - can be protected with a PTFE membrane |
| Linings | Yes |
| Container | HI/A, HI/P, HI/F, HTC |
| Rupture sensor | Electrical, Magnetic, Inductive, Optical |
| 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 DIF rupture discs are composite conventional discs formed by four parts:
a slotted, perforated metal part
a seal membrane (usually in PTFE but also available in many other metallic or non-metallic materials)
a protection section
a calibration ring
This disc has been designed to be mounted between flanges.
It is excellent for use with gas and liquids in static conditions and excellent for low pressures.
DIF discs react to excessive pressure with total opening in a few milliseconds.
They are therefore recommended for valve protection. Supports may be provided for vacuum or counter-pressure protection.
Composite DonadonSDD rupture discs may also be used for simultaneous protection from pressure and vacuum.
| Model | DIF |
| Materials | Stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy 625, Alloy C276, Titanium |
| Membrane | PTFE, PFA, Stainless steel, Aluminium |
| Dimensions | DN 2”(15) – DN 40”(1000) |
| Rupture pressure | 0.5 - 5 bar g (depending on material and diameter) |
| Tolerance | from +/- 5 % to +/- 20% |
| Operating temperature | membrane in PTFE/PFA max 265°C, up to 480°C (depending on the membrane) |
| Operating margin | up to 70% |
| Vacuum support | Available |
| Fragmentation | No (membrane only) |
| Use under valve | Yes |
| Corrosion resistance | Good - can be protected with a PTFE membrane |
| Linings | Yes |
| Container | Mounted between flanges |
| Rupture sensor | Electrical, Magnetic, Inductive, Optical |
| PED Certification [CE STAMP] | Available |
| ATEX EX II 2 GD Certification | Available |
DonadonSDD LPD model discs are a simple, reliable, accurate and economical solution for applications requiring extremely low pressure protection (positive or negative).
Their primary use is to protect processing and storage tanks, atmospheric vessels and silos with low design pressures, and therefore only able to withstand slight pressures and vacuums, against implosion or rupture.
A specially interesting application is in the protection of biogas digesters.
DonadonSDD LPD rupture discs are flat composite discs formed by four parts:
a slotted, perforated metal part
a seal membrane (usually in PTFE but also available in many other metallic or non-metallic materials)
a protection section
a calibration ring with blades to improve membrane rupture
DonadonSDD LPD discs open without fragmentation to prevent product contamination and can be customised to meet a broad range of non-standard specifications and applications.
LPD discs can be designed:
for dual pressure and vacuum protection
to resist vacuum or counter-pressure
| Model | LPD |
| Materials | Stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy 625, Alloy C276, Titanium |
| Membrane | PTFE, PFA |
| Dimensions | DN 2"(50) – DN 20”(500) |
| Rupture pressure | 5 - 500 millibar g (depending on material and diameter) |
| Tolerance | from +/- 5 % to +/- 20% |
| Operating temperature | up to 265 °C |
| Operating margin | up to 60% |
| Vacuum support | Available |
| Fragmentation | No (membrane only) |
| Use under valve | Yes |
| Corrosion resistance | Good - can be protected with a PTFE membrane |
| Linings | Yes |
| Container | Mounted between flanges |
| Rupture sensor | Electrical, Magnetic, Inductive, Optical |
| ATEX EX II 2 GD Certification | Available |
DonadonSDD TCD rupture discs are composite discs formed by four parts:
a slotted, perforated metal part
a seal membrane (usually in PTFE but also available in many other metallic or non-metallic materials)
a protection section
a calibration ring
This disc has been designed especially to be mounted on road or rail tankers containing liquids and gas in static, cycling and pulsating conditions.
TCD discs react to excessive pressure with total opening in a few milliseconds. They are therefore recommended for valve protection. Supports may be provided for vacuum or counter-pressure protection.
| Model | TCD |
| Materials | Stainless steel |
| Membrane | PTFE, PFA |
| Dimensions | DN 2"(50) – DN 2"1/2(65) – DN 3"(80) |
| Rupture pressure | from 3 to 5 bar g |
| Tolerance | +/- 5 % |
| Operating temperature | up to 265 °C |
| Operating margin | up to 80% |
| Vacuum support | Available |
| Fragmentation | No (membrane only) |
| Use under valve | Yes |
| Corrosion resistance | Good - can be protected with a PTFE membrane |
| Linings | Yes |
| Container | Directly mounted |
| Rupture sensor | Electrical, Magnetic, Inductive, Optical |
| PED Certification [CE STAMP] | Available |
| ATEX EX II 2 GD Certification | Available |
DonadonSDD STD rupture discs are conventional concave solid discs.
This is a simple and reliable system used with gas and liquids in cyclic and pulsating pressure conditions. SCS discs react to excessive pressure in a few milliseconds. Supports may be provided for vacuum or counter-pressure protection.
| Model | STD |
| Materials | Stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy 625, Alloy C276, Titanium |
| Dimensions | DN ½”(15) – DN 24”(600) |
| Rupture pressure | 5 – 1150 bar g (depending on diameter) |
| Tolerance | from +/- 5 % to +/- 20% |
| Operating temperature | up to 600 °C |
| Operating margin | up to 70% |
| Fragmentation | Yes |
| Use under valve | No |
| Corrosion resistance | Very good |
| Linings | Yes |
| Container | SU/M, SU/T, HI/A, HI/P, HI/F |
| PED Certification [CE STAMP] | Available |