Combustible Dust Testing
NFPA Standards say, “The owner/operator of a facility with potentially combustible dusts shall be responsible for determining whether the materials are combustible or explosible and, if so, to characterize their properties as required to support the process hazard assessment.”
Your dust is unique and must be tested in order to accurately develop a plan to reduce the risks associated with combustible dust. Factors such a particle size, Kst, Pmax and minimum ignition temperature have a huge impact on the specific controls used to reduce risk. Without a complete understanding of factors unique to your facility’s dust, any system used to process your dust is in danger.
The characteristics of combustible dust are complex and unique at each and every point in your processing system. Our expert team will design a sampling plan to ensure collection of all representative samples and determine the tests necessary to gain the insight required to develop the best solution for your business. Once testing is completed, our team will guide you through the results and discuss the best plan of action.
All of Lewellyn Technology’s combustible dust tests are performed to ASTM standard E1226 (Standard Test Method for Explosibility of Dust Clouds).
ASTM Standard E1226
- “Go – No Go”
- Speed of Pressure Rise (Kst)
- Maximum Explosion Pressure (Pmax)
ASTM Standard E2019
- Minimum Ignition Energy (MIE)
ASTM Standard E1491
- Minimum Ignition Temperature (MIT)
ASTM Standard E2021
- Layer Ignition Temperature (LIT)
ASTM Standard E1491
- Autoignition Temperature (MAIT)
ASTM Standard E1515
- Minimum Explosible Concentration (MEC)
ASTM Standard E2931
- Limiting Oxygen Concentration (LOC)
General categories of combustible dusts are metal dust (aluminum, magnesium, titanium, zirconium, etc.), agricultural (grain dust), wood dust (cellulosic, paper, etc.), chemicals (polymers, plastics, resins, rubber), formulations and mixtures, biosolids, coal dust, organic dust (flour, sugar, soap, etc.), and dust from certain textiles.
Dust Sampling Plan
The sampling plan shall include the following:
- Identification of locations where fine particulate and dust is are present
- Identification of representative samples
- Collection of representative samples
- Preservation of sample integrity
- Communication with the test laboratory regarding sample handling
- Safe sample collection practices
Documentation of test results shall be made available to the authority having jurisdiction.