Sealed Unit Rupture Discs | DonadonSDD | Philippopoulos s.a.

Sealed Unit Rupture Discs | DonadonSDD

Name: Sealed Unit Rupture Discs | DonadonSDD
Brand: Donadon SDD
SKU: Sealed Unit Rupture Discs | DonadonSDD

DonadonSDD SU/M and SU/T Sealed Rupture Disk Units

The DonadonSDD SU/M and SU/T are pre-assembled rupture disk units integrated into a threaded stainless steel connector. The assembly includes a calibrated rupture disk within the connector body, allowing direct installation into process lines without a separate holder. After activation, the entire unit must be replaced.

Difference Between SU/M and SU/T

SU/M: Disk mounted in a two-piece threaded and sealed container.
SU/T: Disk welded directly to the threaded connector.

Both types are designed for small diameters and direct installation on equipment, vessels, instrumentation lines, or auxiliary circuits.

Technical Specifications

Material: Stainless steel
DN: 3 to 40
Bursting Pressure: 20 to 1150 barg, depending on material and diameter
Tolerance: ±5% to ±10%
Operating Temperature: up to 480°C
Operating Margin: up to 80% of burst pressure
Vacuum Support: Not available
Fragmentation: Yes; non-fragmenting versions available on request
Use under Safety Valve: Not permitted
PED / CE: Available

Applications

Suitable for gases and liquids under cyclic or pulsating pressure conditions. Commonly used in small pressure vessels, high-pressure equipment, test rigs, instrumentation lines, skids, and locations requiring rapid overpressure relief within milliseconds.

Selection Criteria

Selection requires process pressure, burst pressure, temperature, DN, media, thread type, presence of pressure pulsations, and acceptable fragmentation behavior. Not recommended for installation upstream of safety valves, as specified in the technical documentation.

DonadonSDD SU/M sealed units are formed by a threaded connector, formed by two pieces, containing a calibrated rupture disc. The rupture disc is inserted in the threaded and sealed container. These units have been designed to make small disc mounting in plants easy and reliable, to simplify handling without need of specialised personnel.

SU/M sealed units are suitable for use with gases and liquids in cycling and pulsating conditions. SU/M sealed units react to over-pressure in a few milliseconds and are recommended for protection of plants, plant equipment and containers.

Model	SU/M
Materials	Stainless steel
Dimensions	from DN 3 to DN 40
Rupture pressure	20 - 1150 bar g (depending on material and diameter)
Tolerance	from +/- 5 % to +/- 10%
Operating temperature	Up to 480 °C
Operating margin	80%
Vacuum support	No
Fragmentation	Yes (Without fragmentation in special execution)
Use under valve	No
Corrosion resistance	Very good
Container	Included, direct mounting
PED Certification [CE STAMP]	Available

DonadonSDD SU/T sealed units are formed by a threaded connector containing a calibrated rupture disc. The rupture disc is welded to the connector. These units have been designed to make small disc mounting in plants easy and reliable, to simplify handling without need of specialised personnel.

SU/T sealed units are suitable for use with gases and liquids in cycling and pulsating conditions. SU/T sealed units react to over-pressure in a few milliseconds and are recommended for protection of plants, plant equipment and containers.

Model	SU/T
Materials	Stainless steel
Dimensions	from DN 3 to DN 40
Rupture pressure	20 - 1150 bar g (depending on material and diameter)
Tolerance	from +/- 5 % to +/- 10%
Operating temperature	Up to 480 °C
Operating margin	80%
Vacuum support	No
Fragmentation	Yes (Without fragmentation in special execution)
Use under valve	No
Corrosion resistance	Very good
Container	Included, direct mounting
PED Certification [CE STAMP]	Available

Certifications

Quality certifications are a guarantee. DonadonSDD has obtained the following certifications.

DonadonSDD provides high-quality products that meet the safety requirements of the systems where they are installed. The organisation and procedures fully comply with the ISO 9001 standard to ensure the utmost quality for our products. Our quality system has also met the stringent requirements of the UNI EN 9100 standard concerning design, development, and manufacture of rupture discs for the aerospace industry.

DonadonSDD products – such as rupture discs, explosion venting panels, and rupture indicators – are certified in compliance with PED directive 2014/68/EU or ATEX directive 2014/34/EU. The rupture discs alone are manufactured, tested, and certified in compliance with ASME directive, Section VIII, Division 1 and carry the relative UD stamp.

DonadonSDD is subject to inspections carried out by 3-A Sanitary Standard, Inc. (3-A SSI) so that our rupture discs can meet the highest sanitary standards.

Upon request, our clients can ask independent inspectors to certify single batches.

DOWNLOAD CERTIFICATIONS