Medical Design Briefs - November 2022 - 31

The rupture disk, which is a one-timeuse
membrane made of various metals including
exotic alloys, is designed to activate
within milliseconds when a predetermined
differential pressure is achieved. However,
given the critical reliability of the equipment
in operation and during storage/
transport, this demands high integrity pressure
relief technology.
As a result, OEMs are increasingly turning
to integrated rupture disk assemblies
with all components combined by the manufacturer,
as opposed to loose rupture disk
and holder devices that leave much to
chance. These assemblies are being tailored
to the application, miniaturized, and
utilize a wide range of standard and exotic
materials, as required. This approach ensures
the rupture disk device performs as
expected, enhancing equipment safety, reliability,
and longevity while simplifying installation
and replacement.
n Separate Components Versus
Integrated Assemblies
Traditionally, rupture disks began as
standalone components that are combined
with the manufacturer's separate
holder device at the point of use. The installation
actions of the user contribute
significantly to the function of the rupture
disk device. When installed improperly,
the rupture disk may not burst at the
expected set pressure. There is a delicate
balance between the rupture disk membrane,
its supporting holder, and the
flanged, threaded, or other fastening arrangement
used to locate the safety device
on the protected equipment.
For this reason, an integrated rupture
disk assembly is often a better choice than
separable parts. Available ready-to-use and
with no assembly required, integrated units
are certified as a device to perform at the
desired set pressure. The one-piece design
allows for easier installation and quick removal
if the rupture disk is activated.
The assembly includes the rupture
disk and housing and is custom engineered
to work with the user's desired
interface to the pressurized equipment.
The devices are typically threaded or
flanged, or even configured for industry
specific connections such as CF/KF/biotech
industry clamp connections/VCR
couplings. The manufacturer combines
the rupture disk and holder by welding,
bolting, tube stub, or crimping based on
the application conditions and leak
tightness requirements.
Medical Design Briefs, November 2022
Plastic Material Changes
Require Latest Plastic Welding
Technologies
Market pressures are driving medical device
designers away from PVC and PC, yet replacements
like PE and PP do not respond well to traditional
plastic joining methods. Reliable assembly requires
advanced BransonTM
ultrasonic and laser welding
systems from Emerson. They produce ultra-clean,
aesthetically superior welds for today's preferred
     
     
advantages.
Learn more at: Emerson.com/Branson
The Emerson logo is a trademark and a service mark of Emerson Electric Co. © 2022 Emerson Electric Co.
www.medicaldesignbriefs.com
31

http://info.hotims.com/82327-758 http://www.medicaldesignbriefs.com

Medical Design Briefs - November 2022

Table of Contents for the Digital Edition of Medical Design Briefs - November 2022