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Odorization

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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  1. Odorization Subpart “L”

  2. Odorization of Gas • Combustible gas in a distribution line must; • Contain a natural odorant, or • Be odorized At ALL Times

  3. Detection Level • Must be detectable at one-fifth of the Lower Explosive Limit (LEL) by a person with a NORMAL sense of smell.

  4. Detection Level • Must know what the LEL of your particular gas stream is!

  5. Transmission Lines • As of January 1, 1977, transmission lines in class 3 and 4 areas must be odorized; unless

  6. 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)

  7. 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)

  8. 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)

  9. 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)

  10. 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)

  11. 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)

  12. 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

  13. Odorizing Equipment • Must introduce the odorant without wide variations. 192.625(e)

  14. Sampling • Each Operator shall conduct Periodic sampling of combustible gases to assure proper concentration. • What’s periodic? • Sample where? 192.625(f)

  15. 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)

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

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