Explosion Severity (Pmax & Kst) Testing

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Our UK laboratory generates explosion severity test data for your combustible dusts. This test generates useful data for any dust that can form a flammable atmosphere. It also determines maximum explosion pressure and provides four key values:

  1. Pmax – The greatest peak pressure achieved throughout a test series.
  2. dP/dtmax – The greatest achieved rate of explosion pressure rise.
  3.  Kst – A dusts explosion severity.
  4.  St Class – Classification of dusts into classes to help with selection of protective equipment (i.e. explosion supression and vent sizing).

The Explosion Severity test will aid in characterising, preventing, protecting and mitigating combustible dust explosions.


The Sigma-HSE Advantage

Our dedicated team of experts are committed to helping you ensure that your dusts and/or powders will not generate a combustible dust explosion allowing you to maintain workplace safety and comply with the regulators.

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Frequently asked questions

What are your Standards & Schedule of Accreditation

BS EN 14034 parts 1 & 2 / ASTM E1226

What is the explosion severity (Pmax/Kst) test?

The explosion severity test is conducted to determine the maximum pressure (Pmax), maximum rate of pressure rise (dP/dt)max and the dust constant Kst value of an ignited combustible dust, dispersed in the air, as a dust cloud.

How does the explosion severity test work?

Working through a range of potentially combustible dust concentrations, powders are dispersed into a 20L explosion vessel (sphere) using dry compressed air. These suspended dust clouds are then exposed to a large 10 kJ chemical source of ignition and the following dust explosion pressure is monitored, measured, and recorded, using high-accuracy piezoelectric transducers.

Testing is conducted over a wide range of combustible dust powder concentrations that enable explosibility curves of Pm, dP/dt & Kst to be generated, along peak values.

What does explosion severity data do?

Data produced via the 20-Litre demonstrates what the maximum dust explosion pressure would be under optimum concentration.

What are the explosion severity test benefits?

Data generated by the explosion severity test is predominantly used for either the design of dust explosion protection systems (venting, containment, or suppression) or to confirm if a material is appropriate for processes within an established hazard protection system.

Discover our range of combustible dust testing solutions

Receive quick and accurate testing data in just a few simple steps

Contact us

Get in touch with one of our experts so we can learn more about your specific process, unit operations and testing requirements. We'll then generate and send you a customised quote.

Prepare & ship

Prepare your material samples and ship them to one of our globally accredited laboratories (UK or India).

Analysis & Reports

Once we've received your samples, we'll begin testing and analysing. We'll then create and send you an actionable in-depth report detailing the potentially hazardous properties of your materials.

Post-project support

If you need support after receiving your report, our after-project support team will be on hand to assist you with any questions you may have.

Discover our range of combustible dust testing solutions

We undertake the following combustible dust and powder tests to simulate full scale process, and process upset conditions. ​

Test your explosive dust and powders for their explosion severity

Whether your process uses wood dust, coal dust or metal dust, getting your hazardous materials tested is an important step to prevent a combustible dust explosion, flash fire or other process-related hazards. Get in touch to learn more about how we can assist you in keeping your process plant and unit operations safe from combustible dust and powder explosions.
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