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Mercury spec in oil & gas industry

Mercury spec in oil & gas industry

(OP)
Folks;
I am looking for mercury specs adopted in the oil and gas industry. Does anybody know maximum values established for natural gas, LPG and naphtha, for example ?
Regards,
Luiz Silva

RE: Mercury spec in oil & gas industry

I've recently had cause to review a dozen different (mainline) pipeline tariffs from around the world and none of them set limits for mercury. I recall from the old old days when we had mercury manometers for dP measurement that gathering agreements sometimes had mercury specs, but those contracts have largely expired decades ago. I don't even remember the numbers, just that the contracts mentioned mercury. Sorry.

David Simpson, PE
MuleShoe Engineering

In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual. Galileo Galilei, Italian Physicist

RE: Mercury spec in oil & gas industry

to supplement David's response, in USA, see paragraph 4 in this document: https://www.ferc.gov/whats-new/comm-meet/061506/G-...

i recall that natural gas qualities contained in a FERC approved tariff is the one that is enforced. FERC approved tariffs are different for each company submitting the filing.

not aware of any mercury specs.

RE: Mercury spec in oil & gas industry

An inhouse company specification states a 10ng / Nm3 upper limit of gas for gas feed to liquefaction plants.

RE: Mercury spec in oil & gas industry

Yes,it is a good question,that the mercury spec. is 1~10mg/Nm3 of natural gas.

RE: Mercury spec in oil & gas industry

1.0mg = 1e-3 grams
1.0ng = 1e-9 grams

RE: Mercury spec in oil & gas industry

Typically, the spec is 10 ng/Nm3 (0.01 µg/Nm3) for natural gas upstream of cryogenic units.
For sales gas (pipeline), it can vary from 10 ng/Nm3 to 20-30 µg/Nm3, typically 1-5 µg/Nm3 but depends on the buyer.
For naphtha, LPG and ethane, the spec is typically around 1-5 wt ppb, depending on what the product is used for.

To reach this specification, solid adsorbents can be used. Metal sulphide on alumina last longer.

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