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Odorization. Subpart “L”. Odorization of Gas. Combustible gas in a distribution line must; Contain a natural odorant, or Be odorized At ALL Times. Detection Level. Must be detectable at one-fifth of the Lower Explosive Limit ( LEL ) by a person with a NORMAL sense of smell.

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odorization

Odorization

Subpart “L”

odorization of gas
Odorization of Gas
  • Combustible gas in a distribution line must;
    • Contain a natural odorant, or
    • Be odorized At ALL Times
detection level
Detection Level
  • Must be detectable at one-fifth of the Lower Explosive Limit (LEL) by a person with a NORMAL sense of smell.
detection level1
Detection Level
  • Must know what the LEL of your particular gas stream is!
transmission lines
Transmission Lines
  • As of January 1, 1977, transmission lines in class 3 and 4 areas must be odorized; unless
transmission lines1

2 miles

Class 3

14 miles

4 miles

20 miles (total)

Flow Direction

Transmission Lines
  • At least 50% of the length of the line DOWNSTREAM from that location is class 1 or 2.

Begin here

192.625(b)(1)

transmission lines2
Transmission Lines
  • Exceptions continued;
    • Transports gas to any of the following facilities which received unodorized gas prior to May 5, 1975:
    • Underground storage field;
    • Gas processing plant

192.625(b)(2)(i)(ii)

transmission lines3
Transmission Lines
  • Exceptions continued;
    • Transports gas to any of the following facilities which received unodorized gas prior to May 5, 1975:
    • Gas dehydration plant; or
    • Industrial plants where;
      • Odorant causes unfit product; or

192.625(b)(2)(iii)(iv)(A)

transmission lines4
Transmission Lines
  • Exceptions continued;
    • Transports gas to any of the following facilities which received unodorized gas prior to May 5, 1975:
    • Industrial plant where;
      • Reduces activity of a catalyst
      • Reduces chemical reaction

192.625(b)(2)(iv)(B)(C)

transmission lines5

LDC

Class 3

Transmission Lines
  • Exceptions continued;
  • At least 50% of a lateral line serving a distribution center is in class 1 or 2 area.

(Any 50%)

192.625(b)(3)

the odorant
The Odorant
  • The odorant may not be deleterious to people, materials, or pipe.
  • Combustion products may not be toxic to breathe or corrosive to materials exposed to combustion products.

192.625(c)(1)(2)

other considerations
Other Considerations
  • Which blend to use for the desired results;
    • Soil absorption
      • Soil types
    • Reaction with gas stream composition
      • Heavy ends present can cause masking
odorizing equipment
Odorizing Equipment
  • Must introduce the odorant without wide variations.

192.625(e)

sampling
Sampling
  • Each Operator shall conduct Periodic sampling of combustible gases to assure proper concentration.
    • What’s periodic?
    • Sample where?

192.625(f)

sampling1
Sampling
  • Master meter operators may achieve this by;
    • Obtain written verification from supplier that the concentration complies; AND
    • Conduct "sniff" tests at the extremities.

192.625(f)

equipment
Equipment
  • Need equipment to determine this quantitative measurement.
  • Can perform “Room Tests”
  • “Sniff tests” and tracking leakcomplaints are good supplements.
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