About Us
Frequently Asked Questions
After the equipment exploded, the flameless venting device activated. What should we do next?
Immediately shut down: Disconnect the process line to ensure safety.
Isolate and tag out: Perform energy isolation on the equipment.
Inspect and Replace:
The rupture disc must be replaced: It is a single-use component that becomes ineffective after activation, so it must be replaced according to the original specifications.
Thoroughly inspect the flame arrestor module: Check for deformation, blockage, or damage. Even if it appears intact, it’s recommended to send it back to the manufacturer for professional testing—or consider replacing it outright—to guarantee proper functionality next time.
Inspect the device body itself: Examine the housing for any permanent deformation or damage.
Investigate the Cause: Analyze the root cause of the explosion and address it promptly to prevent recurrence.
Does the flameless venting device require maintenance? And how often should it be maintained?
Regular maintenance is essential! This is not a "set-it-and-forget-it" piece of equipment.
Regular inspections: Based on the dust load in your operating conditions, establish an inspection schedule (e.g., monthly or quarterly).
Inspection items:
Extinguishing module: Check for dust blockages, cracks, or corrosion. Clean or replace as necessary.
Relief vent disc: Inspect for plastic deformation, scratches, or corrosion. Always replace after each activation.
Sealing rings: Verify that they are free from aging or damage, ensuring a tight seal.
Maintenance records: Maintain comprehensive records of all maintenance activities.
What are the precautions during installation?
Interface Compatibility: Ensure that the device vent size and flange standards perfectly match those of the flameless venting device.
Installation Direction: Install strictly according to the airflow direction indicated on the device.
Unobstructed Vent Path: There must be absolutely no valves, pipes, or other obstructions between the device and the equipment. The device must be installed directly onto the protected equipment.
Safety Distance: The device’s discharge direction should avoid personnel pathways, electrical equipment, and other flammable materials. Although the device produces no open flame, the discharged gases and materials may still carry high temperatures and significant impact forces.
Can a flameless venting device protect multiple pieces of equipment?
Generally not recommended. Each piece of equipment requiring protection—such as dust collectors, silos, and mixers—should be equipped independently with a dedicated flameless venting device. Connecting pipes can significantly increase explosion resistance, compromising venting efficiency while also making calculations more complex and less reliable.
Can a flameless venting device be installed indoors?
This is precisely the primary purpose of a flameless venting device. Since it can extinguish flames, it allows for indoor installation—eliminating the need to route vents outdoors to a safe area as required by conventional explosion relief systems—thereby saving on piping costs and space.
How to choose the right flameless venting device for your equipment?
Selection is a highly technical task that requires careful consideration of the following key parameters. It’s recommended to consult with a professional manufacturer or safety engineer:
Container Maximum Relief Pressure (Pred): This is the most critical parameter and must be determined based on the equipment’s structural strength.
Maximum Explosion Pressure (Pmax) and Kst Value (Dust Explosion Index): These indicators reflect the intensity of a dust explosion. The higher the Kst value, the greater the Pmax—and typically, the larger the dimensions required for a flameless venting device.
Equipment Volume: The larger the volume, the greater the required venting area.
Installation Location and Space: The device comes in various configurations, such as side-mounted or top-mounted, so the installation location and available space must be carefully evaluated.
Will the flameless venting device become clogged?
Yes, this is one of the most common issues. Since the quenching module consists of a dense metal mesh, if significant dust accumulates on the filter surface during the process, it will increase exhaust resistance, reducing the venting efficiency—and in some cases, even preventing effective pressure relief during an explosion. Therefore, special attention is needed for operating conditions where dust buildup is likely to occur.
Can a flameless venting device truly be completely "flameless"?
With proper selection, installation, and maintenance, flameless venting devices can effectively extinguish explosions within their designed protection range, achieving the standard of flames invisible to the naked eye. However, they may release high-temperature gases and a small amount of smoke. If the device is improperly selected or subjected to severe overpressure, there remains a risk of failure.
What is flameless venting? How does it differ from traditional rupture discs?
Traditional rupture discs (blast doors): When an explosion occurs in the equipment, the rupture disc instantly opens, allowing explosive flames, pressure, and unburned materials to be directly vented outdoors. This could potentially trigger secondary explosions or fires outside, posing risks to personnel and equipment.
Flameless venting devices: These integrate a rupture disc with a set of flame-quenching modules—typically made of stainless steel mesh or metal filters. When an explosion happens, the rupture disc opens, enabling the explosive flames and pressure waves to enter the device. Inside, the flame-quenching modules rapidly cool and extinguish the flames, ultimately releasing only the cooled combustion products and residual pressure while preventing flames and high temperatures from spreading into the external environment.
Key difference: Flameless venting can "extinguish" the flame, ensuring safe venting; in contrast, traditional rupture discs merely "redirect" the hazard outward.
The replacement cycle of rupture discs
1. According to the "Safety Technical Supervision Regulations for Rupture Disc Devices," under normal circumstances, the replacement cycle for rupture disc devices is 2 to 3 years. However, for rupture disc devices used in corrosive, toxic media, or harsh operating conditions, the replacement interval should be shortened.
2. Manufacturers recommend replacing rupture discs annually on a regular basis.
3. The following situations require immediate replacement of the corresponding rupture disc safety device:
1) Replacement of the rupture disc itself:
a) During equipment operation, if the pressure exceeds the minimum burst pressure without triggering the rupture disc;
b) During operation, if the temperature exceeds the allowable temperature range specified for the material of the rupture disc device;
c) When the device is disassembled during maintenance activities;
d) After the equipment has been shut down for an extended period (over 6 months) and is being restarted.
2) Replacement of the holder:
a) If the holder shows signs of deformation, cracks, or extensive corrosion;
b) If the sealing surface of the holder is damaged;
c) If the blade of a knife-type holder is chipped, cracked, or has become dull.
Overpressure Relief Solutions for All Your Needs
Contact Us
Room 2207-2208, Kaixuanmen Building A, South Tongbai Road, Zhongyuan District, Zhengzhou City, China.