Types Of Rupture Disk
In this post, we are going to discuss Rupture Disk varieties and accessories of rupture disk. Before we tend to begin initial we are going to see the fundamental of rupture disk.
What is Rupture Disk?
Rupture disks area unit non-reclosing type pressure-relief devices. it’s accustomed to defending vessels, piping, and other pressure-containing parts from excessive pressure and/or vacuum.
Once the rupture disk is burst out the whole vessel or system pressure is mitigated. The system can resume its operation when the exchange of the burst rupture disk.
Advantages of the rupture disk
- Rupture disks are putting in with either single or multiple relief devices to save the vessels. Rupture disks react quickly enough to relife the pressure spikes.
- With no moving elements, rupture disks are easy, reliable, and quicker acting once compare with alternative pressure-relief devices.
- Rupture disks area unit light-weight weight once compare with alternative pressure-relieving devices.
- Rupture disks are used for each gas or liquid handling application for relieving the surplus pressure.
- No maintenance price for rupture disk.
The disadvantage of rupture disk
• The system on stop working when the rupture disk failure, for the replacement of the rupture disk
• High care is needed throughout the installation, a little scratch even damages the rupture disk.
• throughout the installation, improper bolt force conjointly affects the disk burst pressure.
Impact due to temperature
In the rupture disk, the burst pressures will vary considerably with the temperature. If the temperature of the in operation liquid changes, as a result, the temperature of the disk conjointly will increase. This increase in temperature can decrease the burst pressure of the rupture disk. it’ll cause premature failure of rupture disk.
Read: Prevention Methods and Mechanism Of Boiler Hot End Corrosion
Rupture Disk types
The rupture disks ar classified as 3 major tpye
• Forward-acting (Tension loaded)
• Reverse-acting(Compression loaded)
• graphite (Shear loaded)
Forward-acting
The forward-acting rupture disk within which the cup-shaped facet is putting in against the system pressure (Refer below figure). because the method pressure will increase on the far side the allowable in operation pressure, the rupture disc starts to grow.
This growth can continue because the pressure will increase until the tensile strength of the fabric is reached and rupture happens. thus this kind of rupture disk is additionally known as Tension-type Rupture Discs.
Based on the disk configuration the forward acting type disk is more classified into 3 tpye. They are
• Solid Metal Rupture Disks
• Scored Rupture Disks
• Composite Rupture Disks
Solid Metal Rupture Disks
This type of rupture disk generally contains associate angular seat style. thus it’ll give a satisfactory service life once the in operating pressure is up to seventieth of the marked burst pressure of the disk.
If vacuum or backpressure conditions aer gift, then the disk are furnishing with support to forestall reverse flexing.
During burst out of the rupture disk the gap configuration is random and fragment style. thanks to this, they’re not appropriate for install within the upstream of a Pressure escape cock (PRV).
Scored Rupture Disks
The scored forward-acting rupture disk, the concave portion of the disk is meant to burst on the scored lines(Refer below figure) at a rated pressure applied to the cup-shaped facet of the disk.
This style provides a satisfactory service life once the operating pressure is up to eighty-five you have to ninety you look after the marked burst pressure of the disk.
This type of rupture disk can stand up to the vacuum conditions while not vacuum support. however, within the case of backpressure conditions area unit present, the disk is furnishing with the necessary support to forestall reverse flexing.
The gap pattern of the disk is dominant by the scored mark within the rupture disk. throughout explosives, the disk won’t be fragmented. thus this kind of disk is employed within the upstream installation of the PRV.
For a similar burst pressure the scored type, forward-acting rupture disk material is thicker than the non-scored style. Also, it provides extra resistance to mechanical injury.
Reverse-acting Rupture Disks
A reverse acting rupture disk provides benefits, as compared to tension-type rupture discs, which can warrant thought once choosing a rupture disk.
These disks give a satisfactory service life once operative pressures ar 90 zip or less of marked burst pressure. Some sorts of reverse-buckling disks are planning to be exposed to pressures up to 95 you look after the marked burst pressure.
Because a reverse-acting rupture disk is operated with pressure applied on the convex facet, thicker disk materials shall be used. Thereby change the effect of corrosion, eliminating the requirement for vacuum support, and providing longer service life below pressure/vacuum cycling conditions and pressure fluctuations.
Graphite Rupture Disks
Graphite rupture disks ar usually machined from a bar of fine C that has been inseminated with a protection compound to seal the porousness of the C matrix (see figure). The disk operates on a pressure differential across the middle diaphragm or internet portion of the disk.
Graphite rupture disks give a satisfactory service life once operative pressures ar up to eighty you look after the marked burst pressure. additionally utilized in each liquid and vapor service.
If vacuum or backpressure conditions ar present within the system. Then the disk is furnishing with support to stop reverse flexing. These disks have a random gap pattern and ar thought of fragmenting styles. therefore it’s not appropriate for installation on the upstream of a PRV.
A tinny ring referred to as armoring is commonly adscititious to the surface diameter of the disk. it’s accustomed to stop the uneven piping masses acts on the disk. Also, minimize the potential for cracking of the outer C ring.
Basic elements of Rupture Disks
The most basic elements of rupture disks ar the rupture disk holders and rupture disk accessories.
Rupture Disk Holders
Rupture disk holders ar accustomed to clamp the rupture disk in situ and result in a leak-tight, metal-to-metal seal. The way of the holders is usually distinctive to specific makers and designs of rupture disks.
Rupture disk holders ar offered in a very kind of configurations together with full bolting, weld neck, threaded,
etc. the foremost common configuration is that the insert type that matches between customary pipe flanges, and the
the outside diameter of the holder fits within the projection studs. Rupture disk holders ar offered in a very kind of materials and coatings.
Rupture Disk Accessories
A variety of accessories in available to be used with rupture disks in varied applications. the subsequent accessories ar wide used with a rupture disk.
a) Rupture Disk types
These devices usually give AN electrical or mechanical signals which might indicate the gap and/or outflow of a rupture disk.
b) Alarm Monitors
Alarm monitors ar accustomed raising associate degree alarm then the rupture disk open or outflow. The monitor is usually related to the rupture disk indicators or sensors.
c) Heat Shields
Heat shields ar usually put in within the upstream of the rupture disk in high-temperature processes to cut back the temperature act on the rupture disk.
d) Baffle Plates
When the rupture disk is opened. the surplus system pressure is vent to atmosphere. for shielding the personnel and instrumentality from the burst pressure a baffle plate is employed to deflect method discharge away. Baffle plates also are usually accustomed assist in gripping the recoil forces of an activating rupture disk.
Post a Comment