Odorization
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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

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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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