Radius Of Exposure

Definition(s)


Radius Of Exposure (ROE)

ROE is defined in Texas Administrative Code, Title 16, Part 1, Chapter 3, Rule 3.36, b) 3); see A.4.5. Other methods of calculating ROE may apply, depending on local regulations.

Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards

 

Radius Of Exposure

“Radius of exposure” means that radius constructed with the point of escape of poisonous (hydrogen sulfide) gas as its starting point and its length calculated by use of the Pasquill-Gifford equations.

Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. Regulations

Radius Of Exposure

“Radius of exposure” means the radius constructed with the point of escape as its starting point and its length calculated using the following Pasquill-Gifford derived equation, or by such other method as the division may approve:

  1. for determining the 100-ppm radius of exposure:  X = [(1.589)(hydrogen sulfide concentration)(Q)](0.6258), where “X” is the radius of exposure in feet, the “hydrogen sulfide concentration” is the decimal equivalent of the mole or volume fraction of hydrogen sulfide in the gaseous mixture and “Q” is the escape rate expressed in cubic feet per day (corrected for standard conditions of 14.73 psi absolute and 60 degrees fahrenheit);
  2. for determining the 500-ppm radius of exposure:  X = [(0.4546)(hydrogen sulfide concentration)(Q)](0.6258), where “X” is the radius of exposure in feet, the “hydrogen sulfide concentration” is the decimal equivalent of the mole or volume fraction of hydrogen sulfide in the gaseous mixture and “Q” is the escape rate expressed in cubic feet per day (corrected for standard conditions of 14.73 psi absolute and 60 degrees fahrenheit);
  3. for a well being drilled, completed, recompleted, worked over or serviced in an area where insufficient data exists to calculate a radius of exposure but where hydrogen sulfide could reasonably be expected to be present in concentrations in excess of 100 ppm in the gaseous mixture, a 100-ppm radius of exposure equal to 3000 feet is assumed.

Source: Oil and Gas, New Mexico Administrative Code Title 19, Chapter 15, January 2013. Regulations

 

Radius Of Exposure

That radius constructed with the point of escape as its starting point and its length calculated as provided for in subsection (c)(2) of this section.

Source: Oil and Gas Division, Texas Administrative Code, Title 16, Chapter 3, February 2013. Regulations