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 conditions
- complete with a burst detector
| 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 |