By us, the first line for one system was laid in 1953. The next in mid sixties. The markers at street crossings identify that here. Without a serious study with experts (and I believe this will be in teh news here soon) that can get linked into all the variables, the generation of the ILFN has numerous possibilities between pressure changes, mosre horsepower added, different gas quality from changing ground sources, etc.
On May 4, 11:02 pm, Trev <[email protected]> wrote: > I'm in Southern England. > I don't think it's common to have parallel gas lines here- I only > remember seeing single pipes being laid, but of course -they could be > in addition to those existing! > Also- the beat is too constant- an interference beat would probably go > randomly in and out of phase. > I have no knowledge of how gas pressure is regulated here though. > > On May 4, 2:32 pm, Steve K <[email protected]> wrote: > > > > > It may be that two sources (my thought 2 paralell gas lines going into > > a beat frequency. Trev, where do you hear this? Sorry if this is a > > repet question, but US data base is pulging > > > On Apr 26, 1:15 am, Trev <[email protected]> wrote: > > > > Many here report a wavering slow pulse to the Hum. > > > I heard it last night particularly strongly. > > > A throbbing diesel engine has a similar pulse to it and is one of the > > > common descriptors of Hum.http://presscore.ca/2011/?p=2261-Hide quoted > > > text - > > > - Show quoted text -- Hide quoted text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Hum Sufferers" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/hum-sufferers?hl=en.
