High-performance rupture disc Shanghai Qiwei Valve Co., Ltd.

The force of the normal-arched bursting discs is classified according to the structure type. There are mainly three types of bursting discs: flat plate type, forward arch type, and reversed arch type. Flat plate rupture discs have poor overall performance and are mainly used in low pressure and ultra-low pressure conditions, especially in large silos. There are many applications for the positive arch and reverse arch. For the traditional positive-arched bursting disc, its working principle is to use the tensile strength of the material to control the bursting pressure, and the arching direction of the bursting disc is in the same direction as the pressure.

In use, it is found that all of the positive arching bursting discs have the same limitations: when blasting, the bursting disc fragments will enter the discharge pipeline; because the center thickness of the bursting disc is intentionally weakened, it is prone to blasting prematurely due to fatigue; the operating pressure cannot More than 65% of the burst pressure of the bursting disc. This has led to the appearance of reverse-arched rupture discs. The bursting disc utilizes the compressive strength of the material to control its bursting pressure. Compared with the traditional positive arching bursting disc, it has excellent fatigue resistance, no fragments are generated during blasting, and the operating pressure can reach more than 90% of its small bursting pressure. The advantages. Under the subdivision, the reverse-arch type bursting disc includes reversed-groove type, reversed arch-type and reversed-arc type.

 

Bursting Disc Category:

Ordinary arch type bursting disc: Ordinary arch-type bursting discs are made of a single layer of plastic metal material, with the concave side toward the medium, and the bursting disc is tensile and destroyed after the container is overloaded. Suitable for static medium or high pressure vessels.

The role of the holder:

The use of bursting discs includes:

Bursting disc devices are suitable for the following applications:

Rupture disc advantages:

The disadvantages of bursting discs are that they cannot be reclosed after pressure relief and the pressure vessel is forced to stop running, so it cannot be used alone for pressure vessels in system operation.

Back pressure : refers to the static pressure existing at the exit of the bursting disc device when the bursting disc is bursting or leaking. If the pressure is lower than atmospheric pressure, it can be called vacuum pressure.

Back pressure support : refers to a component in a bursting disc device used to prevent failure of the rupture disc due to a reverse pressure differential. If the system pressure is lower than atmospheric pressure, it is usually called vacuum support.

Batch : A group of several bursting discs of the same specification are manufactured in a batch using the same batch of material, called a batch.

Rupture Disc (Rupture Disk): A pressure relief device that cannot be reclosed after bursting under a set pressure and that, when the pressure or vacuum withstand limit is exceeded, the pressure is released to protect the safety of a single device or the entire system.

Bursting Disc Assembly (Friction Disk Assembly): All components mounted on the gripper in order to perform the functions required by the design

Rupture disc device (explosive disk device): A non-recloseable pressure relief device controlled by a differential pressure and having a blasting and bleeding effect. It is not just a separate bursting disc, but it also includes suitable burst disc holders and other components.

Bursting Disc Holder (Explosive Plate Holder): A component of a bursting disc device used to hold the rupture disc and ensure its performance.

Bursting pressure : When the system pressure difference rises to a certain value, the bursting disc will open instantly. The instantaneous system pressure difference is the burst pressure.

Coating : A layer of metallic or non-metallic material (unlined) covering the components of a bursting disc assembly.

Blasting temperature : The system temperature at the time of burst pressure.

Ordinary bursting disc (orthodontic): When the system is pressurized to exceed the tensile strength (or tension) that the disc material can withstand, the bursting disc will open. Ordinary bursting disc is flat or arched, and the direction of the arch is consistent with the direction of the bursting pressure, ie, the bursting pressure acts on the concave surface of the positively arched bursting disc.

Relief Amount: the ability to drain fluid after bursting disc opens.

Bursting board : A blasting board is a pressure relief device. When the system is over-pressurized and is about to explode, the explosion pressure is used to stop the explosion. When the system pressure reaches the "opening pressure" p value, the bursting plate will instantly open the venting pressure.

Foil : A metal strip or sheet used to make a metal rupture disc.

Free flow (bleeding) area : Equivalent small cross-sectional area after exclusion of back pressure support and residual components impacted on the flow area.

IP protection level : It is the level of protection against the ingress of foreign objects (such as dust, moisture, etc.) into the interior of electrical equipment or systems.

Lining : An additional sheet or film (uncoated) attached to a rupture disc or holder.

Scope of manufacture : The scope of manufacture is a range of pressures negotiated between the manufacturer and the user as required. The average burst pressure of the same batch of rupture discs must be within this pressure range.

Large operating pressure : refers to the system pressure that makes the bursting disc work normally but will not cause the rupture disc to be excessively worn out. Depending on the type of rupture disk, the large operating pressure is generally 50% to 100% of the rated burst pressure. It is also commonly referred to as the operating ratio.

Operating pressure (working pressure): The system pressure when the bursting disc is operating normally.

Operating temperature (operating temperature): The system temperature when the bursting disc is operating normally.

Blasting tolerance : At the same blasting temperature, the actual bursting pressure will have a difference between a large value and a small value. Blast tolerance is the allowable deviation between the actual burst pressure and the calibrated burst pressure. Usually expressed as a percentage (or psig). After determining the form, type and burst pressure of the bursting disc, the actual bursting pressure must be within the tolerance range.

Relief pressure : Large system pressure in the vent state. (different from burst pressure)

Bleed temperature : High system temperature in the bleed state. (different from blasting temperature)

Reverse- arching rupture disk : A rupture disk in which the bending direction is opposite to the direction of pressure, that is, the pressure acts on the convex surface of the rupture disk.

Composite Rupture Disc : A bursting disc with a structure of more than two layers, in which one layer reduces the pressure on the bursting disc through the construction of holes or gaps and thus controls the burst pressure. Composite bursting discs can be flat or arched.

Designed burst pressure : The pressure required by the customer or provided by the manufacturer at the same blasting temperature when designing bursting disc performance requirements. Can be expressed as small or large value.

Introduction to Rupture Discs Rupture discs are important safety devices for pressure vessels and pipelines. It can burst at the prescribed temperature and pressure.

Relieve pressure and ensure the safety of people’s lives and property.
The bursting disc device consists of a bursting disc and a holder. A bursting disc is a component that bursts and decompresses at a calibrated burst pressure and temperature. A gripper is an auxiliary component that holds a rupture disc at an appropriate part of the vessel.
Bursting disc safety devices have the advantages of simple structure, sensitivity, accuracy, no leakage, and strong discharge capability. It can work reliably in viscous, high temperature, low temperature, and corrosive environments, and it is also an ideal safety device for ultra-high pressure vessels.
Rupture discs are important safety devices for preventing overpressure destruction of pressure equipment. They are widely used in chemical, petroleum, light industry, metallurgy, nuclear power, dust removal, firefighting, aviation and other industrial sectors.
Bursting disc working principle The bursting disc device is a pressure relief device that cannot be repeatedly closed. It is activated by the static pressure at the inlet and releases the pressure through the rupture of the pressurized diaphragm.
Simply put, it is a one-time pressure relief device. When the pressure difference between the two sides of the bursting disc reaches a predetermined value at a set blasting temperature, the bursting disc can be actuated (broken or detached) and fluid can be released.
The characteristics of bursting disc (1) apply to slurry, viscous, and corrosive process media. In this case, the safety valve does not work. (2) The inertia is small, and it responds rapidly to the rapidly increasing pressure. (3) In case of fire or other accidents, after the main pressure relief device is opened, the rupture disc can be used as an additional pressure relief device (4) tightly leak-free, suitable for pressure vessels containing expensive or toxic media (5) Material manufacturing, strong adaptability (6) Applicable places for easy maintenance and replacement of bursting discs (1) The working medium in the pressure vessel or pipeline is sticky or easy to crystallize and polymerize, making it easy to stick or block the safety valve disc and the base. Safety valve location;
(2) The chemical reaction of the material in the pressure vessel may cause the pressure in the container to rise sharply at once, and the safety valve cannot open the pressure relief place in time;
(3) The working medium in the pressure vessel or pipeline is a highly toxic gas or an expensive gas, and the use of a safety valve may cause leakage and cause environmental pollution and waste;
(4) Pressure vessels and pressure pipelines are required to be fully discharged or fully discharged without any hindrance;
(5) Other places that are not suitable for safety valves and are suitable for bursting discs.
Rupture disc classification
1. According to the type to divide (1) positive arch type:

The system pressure acts on the concave surface of the bursting disc.
Orthogonal Orthogonal Orthogonal Arch Slot Orthodontic Slot (2) Inverse Arch: The system pressure acts on the convex surface of the bursting disc.

Anti-Arch Knives Anti-Arcade Crocodile Inverse Arch with Slotted (3) Plate Type: The system pressure acts on the plane of the rupture disc.

Flat plain flat slotted slot with slot
2. According to the material to be divided (1) metal: stainless steel, pure nickel, Hastelloy, Monel, Inco nickel, titanium, tantalum, zirconium, etc. (2) non-metal: graphite, fluorine plastic, organic glass (3) metal Composite non-metal

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