Hydrogen ignition modes
Hydrogen ignition modes
(OP)
Dear all,
I am investigating modes of hydrogen ignition from a pipline leak.
Some suggested modes are:
1) Self ignition
2) Ignition via Electro-static Discharge (ESD) from clothes
3) Ignition via ESD caused by near by steam leak
4) Sparks from tools/chains from nearby work
5) Pyrophoric deposits in main
6) Smoking!
7) Non spark safe/intrinsically safe electronic equipment
8) Lightening
Questions:
1) I have received mixed messages about H2 self ignition; is there any experience or a theoretical case for this?
2) For ESD from People's clothes and Steam leaks; I have not found quantitative data for this - can anyone help?
3) Can anyone suggest any other modes of ignition that has not been considered?
I would appreciate any help on these,
Regards
I am investigating modes of hydrogen ignition from a pipline leak.
Some suggested modes are:
1) Self ignition
2) Ignition via Electro-static Discharge (ESD) from clothes
3) Ignition via ESD caused by near by steam leak
4) Sparks from tools/chains from nearby work
5) Pyrophoric deposits in main
6) Smoking!
7) Non spark safe/intrinsically safe electronic equipment
8) Lightening
Questions:
1) I have received mixed messages about H2 self ignition; is there any experience or a theoretical case for this?
2) For ESD from People's clothes and Steam leaks; I have not found quantitative data for this - can anyone help?
3) Can anyone suggest any other modes of ignition that has not been considered?
I would appreciate any help on these,
Regards





RE: Hydrogen ignition modes
2) NFPA68 I think lists Minimum Energies for Ignition. It may list energies generated by various events. Good sources are Lees, Bodurtha, and some of the CCPS books. Trevor Kletz is also a good source of this type of data. Sorry I do not have the exact references at hand.
3) The most popular way to make pipeline explosions is to dig them up with a back hoe. This provides the leak and the source of ignition. Welding on the line will also do the job.
RE: Hydrogen ignition modes
RE: Hydrogen ignition modes
RE: Hydrogen ignition modes
For isenthalpic expansion from 500 psia to 15 psia, starting at 200 deg F, the hydrogen would only pick up 2 deg F. I would certainly welcome a second opinion on this.
RE: Hydrogen ignition modes
RE: Hydrogen ignition modes
As always I hope the above may be of help to Viridor.