What Is LEL, UEL, TLV, STEL, IDLH and Flash Point Chemical Industry Interview Q&A-Job Availables

What Is LEL, UEL, TLV, STEL, IDLH and Flash Point Chemical Industry Interview Q&A-Job Availables 

Flash point : 

The lowest temperature of liquid, which produces sufficient vapor & it can give momentary flash over in presence of external source of ignition

LEL ( Lower Explosive Limit ) : 

The lower Explosive limit ( LEL) is defined as lowest concentration of Combustible or flammable gases or vapor that must be present which will not support combustion in presence of source of ignition. 

Prior to entry of a confined space, or to carry Hot work in hazardous area the LEL Of Combustible gases must be Zero 

What Is LEL, UEL, TLV, STEL, IDLH and Flash Point Chemical Industry Interview Q&A-Job Availables 

The region between these two extremes is referred to as the flammable range.

Example : 

Methane gas has an LEL of 5.0%. If the atmosphere has less than 5.0% methane, an explosion cannot occur even if a source of ignition is present.

UEL ( Upper Explosive Limit ) : 

Upper Explosive Limit (UEL) is defined as highest concentration of Combustible or flammable gases or vapor and minimum concentration of Oxygen that will not support to  combustion in presence of source of ignition. 

TLV (Threshold limit value) : 

TLV value refers to air born concentration of a chemical. This is the time weighted concentration believed to be safe for the average person during an 8 hours working in a day and 48 hours in a week for a prolonged periods. For gases & vapors

TLV is usually expressed in parts per million (PPM) & for fumes and mists and for some dusts, the TLV is usually given as milligrams per cubic meters (mg/m3)

STEL( Short Term Exposure Limit ) : 

A short-term exposure limit is the acceptable (Maximum Concentration) average exposure over a short period of time, usually 15 minutes as long as the time-weighted average is not exceeded.

In other words  human can work 15 Minutes and rest 1 Hour's

IDLH (immediately dangerous to life and health) : 

IDLH means immediately dangerous to life and health. The hazard, such as a toxic gas, poses an immediate threat to health or life, would cause irreversible adverse health affects, or would interfere with your ability to escape from a dangerous area or 

IDLH (Immediately Dangerous to Life or Health)-Any atmosphere that poses an immediate hazard to life; poses immediate, irreversible debilitating effects on health, or would impair a person ability to escape from a dangerous atmosphere This includes oxygen-deficient

atmospheres

Necessity Of Gas Detection In Petrochemicals, Pharmaceutical and Petroleum Industry.

1. To carry out hot work in hazardous area

2. To allow man entry inside the confined space.

3. To protect person against exposure of toxic vapor and any other activities which can lead to Fire or Explosion

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