Reverse arch bursting discs are a high-precision safety relief device, and their installation quality is directly related to the safety of pressure equipment and personnel. Unlike conventional domed bursting discs, they utilize the principle of compressive instability (the dome being under compression) and flip and rupture when the set pressure is reached, offering advantages such as good fatigue resistance and high bursting pressure accuracy. However, due to their special structure, installation orientation, external damage, and sealing force are three key factors for installation.
Preparation before installation: selection verification and unpacking inspection.
Before installation, the design drawings must be carefully checked against the actual selected model. The following key parameters need to be confirmed:
1.Bursting pressure: ensure that the rated bursting pressure of the selected disc matches the design pressure of the equipment.
2.Operating temperature: verify that the medium’s temperature is within the allowed operating temperature range of the disc.
3.Medium corrosiveness: confirm that the selected material can withstand corrosion from the medium.
The reverse arch with groove type (YCS) bursting discs produced by Shenyang Xinguang Aerospace Safety System Co., Ltd. are suitable for gas media, with a maximum working pressure reaching up to 90% of the minimum allowable bursting pressure, and exhibit excellent fatigue resistance. Its reverse arch type (YK) bursting discs are particularly suitable for protecting large-diameter, low-pressure systems, and will pop out as a whole without fragments after bursting.
Confirming the structural orientation is the most critical step in installing reverse arch bursting discs. The dome (convex side) should face the pressure source (high-pressure side), and the concave side should face away from the pressure source. This orientation requirement is based on the working principle of "compressive instability," and only in the correct direction can the arch structure flip and rupture at the set pressure. If installed in reverse, the equipment may overpressure and fail to burst even at the destructive pressure, leading to serious accidents.
A strict visual inspection of the bursting disc should also be conducted before installation: ensure the diaphragm surface has no scratches, indentations, rust, or deformation, and the sealing surface is intact; also check if accessories like holders fit properly and dimensions are correct. Special attention should be paid, as reverse arch bursting discs are very sensitive to tiny defects such as pits or scratches; if any damage is found, the disc must not be used.
Preparation of the installation environment:
1.Thoroughly clean the flange or pipeline interface at the installation location, removing oil, rust, welding slag, or remnants of old gaskets.
2.Ensure there are no impurities, corrosion, or damage in the pipeline or vessel at the installation spot.
3.Check that the sealing surface of the holder is flat.
Precision Assembly: Holder Positioning and Sealing Handling.
1.Reverse arch bursting discs are usually used together with holders and cannot be arbitrarily replaced with flanges.
2.Bursting discs from different manufacturers use different positioning methods, such as concave-convex positioning or pin positioning.
3.During installation, it is necessary to place the holder on a flat surface; insert the bursting disc into the inlet holder (lower holder); do not directly touch the core area of the bursting disc, and handle it by holding the edge of the holder; do not tap or apply impact force to the bursting disc.
4.When handling the connecting piece, loosen the screws on the holder, remove the connecting piece, and ensure that the diaphragm is in a free state.
5.During holder assembly, match the outlet holder with the inlet holder, align the screw holes on their sides, connect them with the connecting piece, tighten the screws, and then check if the holder's nameplate arrow direction is consistent with the directional marking on the bursting disc.
For bursting disc products from Shenyang Xinguang Aerospace Safety System Co., Ltd., the bursting disc and holder must be assembled by the manufacturer and shipped together, which ensures the assembly accuracy and sealing performance of the product at the factory.
Common Misunderstandings and Prohibitions:
1.Do not strike or collide with the bursting disc. Minor damage caused by knocks during installation is a major reason for premature failure.
2.Do not add additional gaskets between the bursting disc and the flange without authorization. Reverse arch bursting discs rely on the holder for sealing, and extra gaskets may alter the force distribution, leading to leakage or deviation in bursting pressure.
3.Do not use beyond the service life. Even if it has not burst, it has a fatigue life and must be replaced regularly.
4.Do not ignore the direction. There are strict directional standards during installation, and the product must be installed according to the directions marked in the manual.
5.If a safety valve is installed in the system simultaneously, ensure that the bursting disc and safety valve opening pressures are matched to reduce mutual interference.
Although installing reverse arch bursting discs seems simple, it actually involves many details. From selection verification and direction confirmation to precise assembly, torque control, and regular inspection and maintenance, each step directly affects the operational safety of the equipment. Shenyang Xinguang Aerospace Safety System Co., Ltd. has long been committed to the research and innovation of bursting disc technology, providing users with reliable overpressure protection solutions. If you wish to learn more about bursting discs, please feel free to contact us.
