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RONSOR APRIL 2021 BULLETIN

Ronsor Bulletin

 

In this bulletin, we discuss:

  • Dust explosions and BS&B solutions to protect against them
  • Our new range of ultrasonic flow meters

Dust explosions and BS&B solutions to protect against them

What causes a dust explosion

An explosion results from the ignition of a combustible material (dust, gas or vapour) when mixed with oxygen present in the air. When this takes place inside a process or storage enclosure, the rapid rise in pressure developed will exert destructive forces within a few milliseconds that will place both personnel and equipment at risk. Most materials handling, processing and storage equipment are not designed to handle the pressure of deflagration. Only equipment designed to resist the maximum pressure (Pmax) developed by the combustion process will remain standing. Such design pressures typically exceed 75 psi(g), making design for containment of a deflagration prohibitively expensive in most cases.

*A deflagration is an expanding flameball that proceeds below the speed of sound in air, as compared to a detonation which exceeds the speed of sound in air. Typically, a process can be protected from deflagration hazards.

In a production plant, it is very common to have process equipment storing large amounts of combustible material. Process equipment such as dryers, dust collectors, bins, cyclones and silos are examples of these.

Often, a hybrid of measures is used to manage the deflagration process safety risk. They can be classified as passive and active technologies. Passive technologies typically function via mechanical means, without external energy requirements (such as explosion vents). Active systems require sources of energy to function. These include explosion suppression systems, chemical isolation, spark detection and extinguishing systems.

Explosion Venting

Explosion Venting

Explosion vents are designed to allow the explosion to fully develop and direct the flameball to a safer location. There is an option to have vent sensors provide a process shutdown signal.

Explosion suppression and chemical isolation

Explosion Suppression and Chemical Isolation

This set-up involves a pressure sensor inside the enclosed area, an isolation cannon and a suppressing cannon. Once pressure waves from the fireball is detected by the sensor, the suppression cannon module is activated to extinguish the fireball, followed by the isolation cannon to block the flames from entering adjoining process equipment.

Flameless Venting

Flameless Venting and Mechanical Isolation

The flameless venting system consists of an explosion vent and a quenching module. When there is a rapidly building pressure of a deflagration, the explosion vent opens to relieve it. As the developing fireball passes through the open explosion vent, it is intercepted by the quenching module which retains the flame, hot gases as well as the burning and unburnt dust.

Contact Us for more information about BS&B Explosion Protection Systems

Content and images above property of BS&B Safety Systems

Ultraflux Ultrasonic Flow Meters

Overview

Ultraflux is part of the Faure Herman group of companies and have specialised in ultrasound instrumentation since 1974, developing, manufacturing and selling solutions based on the ultrasonic transit time difference principle – a non-intrusive method of flow measurement that allows bi-directional flow readings to be taken.

Ultraflux flow meters make it possible to measure the flow of any type of homogeneous fluid (liquid or gas), intrusively or non-intrusively, continually or occasionally.

Uf801Clamp-on Sensors

 

Some of the applications ultrasonic flow meters are used for are:

  • Flow rate measurement of water
  • Interface detection during hydrocarbon draining of storage tanks
  • Detection of multiple products in a pipeline

Contact Us for more information about our ultrasonic flow meter measurements.

Content and images above property of Ultraflux.

 

More Information

BS&B Industrial Protection Devices

Ultraflux Ultrasonic Flow Meters