To flashback or not to flashback, that isn’t the question apparently

From LE:

Hose to torch or hose to regulator?

Dale gets it right this time with this answer:

Torch to hose protects hose and regulator. Hose to regulator only protects regulator. Continue reading


Same old, same old…

More fallacy from Dennis Brady on LE:

I mean 2 – 45 deg elbows connected together to produce the 90 deg bend. The wider arc causes less air flow resistance. Even better would be a wide arc curve (these are available for metal ducting but are pretty pricey).

For at least 40 years, the plumbing code for drains and vents stated specifically that in any run of drain or vent, one only 90 was permitted but an unlimited number of 45’s was allowed. If the experts insist that makes a critical difference for venting plumbing drains, it’s reasonable to assume it’ll make a significant difference for venting torching fumes.

I guess Dennis has never looked under his sink. A standard plumbing P trap consists of at least 3, count them, 3 90 degree bends to form the drain trap. 90 degree bends are in every single plumbing run made. Continue reading

A rose by any other name

The ever delightful Dennis Brady never fails to entertain. His latest on using a window AC unit as a source of fresh air from LE:

Air is air. A specially dedicated incoming air supply is a lovely thing but is NOT essential. Whether or not air coming in through a heater or AC is sufficient replacement depends on the volume and consistency of that incoming air. If there’s enough volume to replace air being exhausted, and it comes in fairly steadily, it will work perfectly. Continue reading

They can’t refute the facts…

so they resort to ad hominem attacks…

The little dragon writes on TAM:

I trust information from people who know what they are doing. People who have studied and tested to get their license. People who have to put up with snap safety inspections to keep their insurance current.

What some of the ‘safety guru’s’ (including the main idiot) do is read a book or surf the web. Do they have a GB98? Do they have a EE98? Their MM98? Their LPG certification?? no.

An ad hominem attack is where the attack is based on the characteristics or authority of the writer without addressing the substance of the argument. When you have to resort to ad hominem attacks to make your point, you’ve already lost the argument. Continue reading

You have GOT to be kidding me…

Deb Kauz writes:

I understand all of this and I also understand that it all assumes that we sit around and do nothing while this was occuring. There IS a risk. I’m not trying to say there isn’t but it seems a little like ChickenLittle yelling about the sky falling. If I’m the person who gets hurt yep, I’ll be really pissed at myself. However, I think the safety checks that I do minimize my risks. Do I want to rely on someone else’s quality control? I do it all the time. Every time I get in my car, every time I light my stove…every time I do anything that can be dangerous I rely on someone else’s quality control. As a nurse BOY did I rely on someone else’s quality control…as did the ICU patients that I cared for on a daily basis. Our LIVES revolve around someone else’s quality control.

Uhh, Deb? First of all, you work OUTSIDE with your bulk tank and hot head torch. You’ve already minimized your hazards by a huge amount. Next, the examples you cite as “someone else’s quality control” are based on either huge numbers of production (automobiles, medical instruments, etc), whereas the production of RV tank hoses is relatively small in comparison.

This is about EDUCATION. Telling people the FACTS so they can make a safe decision with all the FACTS. Continue reading

The danger of leaking propane

In previous articles I have discussed the ins and outs of NFPA 58, that connecting a hot head torch to a bulk tank is against code and therefore illegal etc ad nauseum…but I have not presented any “proof” of exactly WHY it is hazardous to do so.

There is a mathematical formula which converts flow of a particular gas in a line to a volume. Here is the formula:

V = 58 * SQRT((p * (d^5))/(W*L))

V equals volume flow in CFM
p equals difference in pressure between two ends of the hose in PSI
d equals ID of the hose in inches
W equals weight in pounds of one cubic foot of the gas
L equals the length of the hose in feet. Continue reading