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Hazard Analysis (KST)

Definition

KST is a generalized number used to estimate the anticipated behavior of dust deflagration or explosion. It indicates a dust’s approximate explosive power and explosive probability.

During KST testing the following are analyzed:

1) Minimum Dust Concentration
2) Minimum Ignition Temperature
3) Minimum Ignition Energy

KST testing is conducted by:

1) Testing bulk samples of dust between 2-2.5lbs for a general NFPA-classified KST number.
2) The samples of dust are taken from several locations such as ceilings, ductwork and corners.
3) The dust is ignited in a clear cylinder and measured.

 

ST 0 0 No explosion
ST 1 > 0 and ≤ 200 Strong explosion
ST 2 > 200 and ≤ 300 Strong explosion
ST 4 > 300+ Very strong explosion
KST Categories & Explosiveness

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