Instructional Videos

API RP 500 VS NFPA 497

The common purpose of these two Recognized And Generally Accepted Good Engineering Practices (RAGAGEP) for determining hazardous area classification for Class I areas is presented and the industrial areas where each is applied is discussed.    

Bath HAC Methodology

Bath Process Safety Management recommends its eight step process to determine the hazardous area classification of a process unit or facility handling flammable hydrocarbons.  The result is the creation of record documents which contain the hazardous area classification information required by OSHA and the NEC.

Determine Material Groups

The steps to determine a material group associated with the Division concept for Class I and Class II materials are presented.  These steps are based on the complete definition for material groups based on the pertinent testing data found in NFPA 70®, the National Electrical Code (NEC).

Drivers for HAC

The main driver for hazardous area classification (HAC) documentation is its legal requirement.  Other drivers are also presented to show the integration of HAC documentation with other OSHA process safety requirements.

Electrical Area Classification is a Misnomer

An explanation is provided for the terms "electrical area classification" and "hazardous area classification" which are commonly used synonymously in industry.  Information is given on how the results of a thorough hazardous area classification meet the requirements of NFPA 70®, the National Electrical Code (NEC).

Bath HAC Best Practices

Bath Process Safety Management's Best Practices utilized in determining a proper hazardous area classification (HAC) are given.  The subsequent benefits of these Best Practices are listed and focus on adding real value to the end user of the HAC information required as OSHA Process Safety Information.

HAC Compliance Assessment and OSHA

The purpose of a hazardous area classification (HAC) compliance assessment is given and an explanation provided on why it is required by OSHA.  The overall benefits of an HAC compliance assessment along with the ties back to record HAC documents are given.

HAC Documentation

Three major issues associated with using hazardous area classification (HAC) documentation at a plant or facility are identified.  Each issue is discussed via an informational format which describes an approach to avoid the issue rather than solve the issue.

HAC is Not a Cut and Paste Process

The downside of assigning hazardous area classification (HAC) by only cutting and pasting diagrams and figures from recommended practices is presented.  The key components of a proper HAC methodology are discussed along with the uses of the HAC documentation as process safety information.   

HAC of Analyzer Buildings

The hazardous area classification of process-related buildings in general is complex and can be confusing. The factors which must be considered to determine the hazardous area classification of both the interior and exterior of an Analyzer Building are presented. 

HAC of Battery Rooms

The hazardous area classification of a battery room is required due to the potential presence of hydrogen gas (Group B).  The key questions to be asked and answered are presented to determine the hazardous area classification of both the interior and exterior of a battery room.

HAC of Electrical Buildings

Electrical buildings in a production facility require a thorough hazardous area classification (HAC) assessment.  Factors which impact assigning the proper HAC to a building which houses electrical equipment only with no batteries and no piped in process materials are presented. 

Material Groups Defined

An overview of Material Groups associated with the Division concept and assigned to the specific classification of Class I for gases and vapors and Class II for combustible dusts is provided.  Sources for additional information on this topic are also given. 

Setting a NEC T Code Value

The Temperature Class (T Code) is defined by NFPA 70®, the National Electrical Code (NEC).  The steps to determine the T Code for a material is presented via a show and tell example.     

Selecting an Overall NEC T Code

The answer to the question When do new chemicals in the process change the overall T Code? is given via a show and tell example.    

Class I Point Sources of Release

The definition of a point source of release is given and some examples provided for a Class I location. 

Roadways and HAC

The answer to the question How are roadways addressed in a hazardous area classification assessment? is given in two parts.  The first part gives the history of why this question is asked and the second part provides the answer to the question.

Zone VS Division Terminology

The scope and terminology differences between the Zone concept and the Division concept for hazardous area classification are discussed.