Anhydrous Trimethylamine

[rika kose]

someone is familiar with TMA anhydrous?
Is liquid TMA conductive? if it is not, we have to be careful about the transportation for its static electricity. it is flammable.

Thanks.

 

[pierreick]

Hi,
Information available in the link underneath; Let you contact Eastman for support.
Please read SDS and technical document in the link.

Trimethylamine Anhydrous (TMA) - US | Eastman

TMA Anhydrous (US) is a versatile building block that is used in a limited number of applications.

www.eastman.com

Pierre

 

[shvet]

TMA is a liquified gas. Why are you concerned about the static electricity? Are you going to transport TMA pressurized under an air blanket?

update
As per table B.2 NFPA 77, the TMA is recognized as a conductive liquid (conductivity >10^4 pS/m)

 

[pierreick]

Hi,
More info about the product:

Triethylamine

Triethylamine | (C2H5)3N or C6H15N | CID 8471 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.

pubchem.ncbi.nlm.nih.gov

Pierre

 

[georgeverghese]

Flash point is 20degF, so it is better to store under its own vapor pressure in the absence of O2, or under N2 blanket - there may be ignition sources other than static electricity.

 

[rika kose]

The concern is from a safety study about a flow transmeter. the liquid TMA velocity in the flow meter can up to 7 m/s.
We saw an accident in the CS2 flowmeter.
If TMA liquid has so low conductivity, the same accident can be expected, right?

 

[rika kose]

TMA is a liquified gas. Why are you concerned about the static electricity? Are you going to transport TMA pressurized under an air blanket?

update
As per table B.2 NFPA 77, the TMA is recognized as a conductive liquid (conductivity >10^4 pS/m)

Thanks a lot!

 

[shvet]

We saw an accident in the CS2 flowmeter.
If TMA liquid has so low conductivity, the same accident can be expected, right?

1 Google says CS2 is the model of a milk flowmeter. What does CS2 stand for?
2 No, it can't. Conductivity has nothing to do with process sensors, given the flammable liquid is not stored/transported/processed in contact with air.

If your case is not from the food industry, you may refer to NFPA 77 or API 2003 as a referenced code.

 

[rika kose]

1 Google says CS2 is the model of a milk flowmeter. What does CS2 stand for?
2 No, it can't. Conductivity has nothing to do with process sensors, given the flammable liquid is not stored/transported/processed in contact with air.

If your case is not from the food industry you, may refer to NFPA 77 or API 2003 as a referenced code.

Carbon disulfide. There was an explosion near a flowmeter several years ago. people assumed that was because the air ingression and static charge in the flowmeter.

I also read some articals, selections of a flowmeter, max. velocity in the flowmeter should be considered for the static electricity risks.

 

[shvet]

near flowmeter - do you mean a spill of liquid?

repeated - TMA is a liquified gas
how air is going to come into contact with TMA?

why do not you want to refer to a dedicated industry code, e.g. NFPA 77?
is your case so unique that is not covered by those?

 

[rika kose]

near flowmeter - do you mean a spill of liquid?

repeated - TMA is a liquified gas
how air is going to come into contact with TMA?

why do not you want to refer to a dedicated industry code, e.g. NFPA 77?
is your case so unique that is not covered by those?

Yes TMA is liquified gas, boiling point at ATM is 3 ºC. in winter time, daily T is not higher than 3 ºC, bare pipe. storage tank is not insulated either.
Operators sometimes close the discharge valve at storage tank, and valves at users are closed when no production.
And N2 blanketing at storage tank is not robust either. People all agree that air ingression in such pressure system is not impossible.

We generally follow the EN norms.

 

[shvet]

You mean that you want to elliminate an internal explosion as a result of a failure of the vacuum breaker, correct?
Is this storage vessel/tank designed for vacuum conditions? Or will it implode before the air gets into it?
It is not clear why are you concerned of a TMA flowmeter. How does the air come to a flowmeter? Can you share your logic?

In general
Can you share a bit more info - than shreds and pieces - related to the system you want to improve, issues identified, and a logic behind all of this?
You have come here for answers, right? Why are you evading sharing the details with us?