DonadonSDD S.r.l.

Donadon DCD rupture disc is a composite conventional disc 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 disc is particularly suitable to be fitted on equipment and systems.

It reacts to over-pressure in a few thousands of a second with total opening and without fragmentation.
DCD disc is therefore recommended for protection of pressure relief valves.
Supports may be used for protection from vacuum or counter pressure.

DCD disc may also be used for protecting silos or other equipment from vacuum.
Available in special execution certified Ex II 2GD according to European Directive 94/9/CE (ATEX).
 

The DONADON GM of monoblock graphite rupture disc is versatile and suitable for numerous applications. It may be directly inserted between flanges
Graphite discs are very resistant to aggressive fluids, even at high temperature.
Bursting pressure has low sensitivity to temperature variations.

GR disc is made of high purity graphite impregnated with phenolic resins in order to make the product non porous
Opening is total but with fragmentation.
Vacuum support is required for rupture pressures below 1.7 Bar. At higher calibrations the disc is self-supporting.
 

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. The disc will attain full relief within 1 second from the start of rupture and allows for instantaneous system relief at ultra low pressures.

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

Donadon SDD has invested in research & development and in the purchase of new machines with last generation technology. The result of these undertakings is the series NS NanoScored.

These are very precise and reliable discs that can be manufactured in a very broad range of diameters and pressures.

Indeed, the new productive processes developed by Donadon SDD enable to obtain rupture discs that are:

• resistant to fragmentation even for high burst pressures
• with rupture pressures below 0.5 bar (7 psi g) even for DN40
  This innovative technology has allowed Donadon SDD to implement new rupture discs entirely made with laser, not available on the market:
• compression loaded with 6 or more radial scores (SCR/NS model)
• compression loaded (reverse buckling) with Perimetral scoring (Y90/NS model)
• tension loaded with 6 or more scores (SCD/NS model)
• for standard or sanitary disc holders (Tri-clamp)
  Both the production process and the brand are patented.

Donadon PS/R (rectangular) and PS/C (circular) venting panels are composite tension panels composed of 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

In addition vacuum support is available

Suitable for use with gas in static, pulsating and cyclic conditions.
PS vent panels are available in square, rectangular or circular models. They usually have very low vent or vacuum pressures.
PS/R and PS/C venting panels are mainly fitted to dust manifolds, dryers, troughs, silos, separators, mixers, boosters, air filters and sieves.
They can be fitted between welded frames or non-machined profiles in carbon or stainless steel. Machined frames or expensive holders are not necessary.
Venting panels may be supplied in ATEX execution, certified Ex II 2 GD and may therefore be installed in in locations where the presence of explosive atmospheres is probable (locations classified as category 1, 21, 2 and 22).
Venting panels available in ATEX certified execution are both the rectangular (PS/Ex/R) and circular (PS/Ex/C) models
For these applications we recommend the intrinsic safety alarm system NAM 01 certified Eex ia IIC T6 according to European Directive 94/9/CE (ATEX).
Donadon SDD manufactures venting panels in special executions according to European Directive 94/9/CE (ATEX), certified Ex II 2 GD. Therefore these panels may be used in locations where the presence of explosive atmospheres is probable (locations classified as category 1, 21, 2 and 22).
Both rectangular venting panels (PS/Ex/R) and circular venting panels (PS/Ex/C) are available in ATEX certified execution
For these applications we recommend the intrinsic safety alarm system NAM 01 certified Eex ia IIC T6 according to European Directive 94/9/CE (ATEX).