Drafting with Soft-Suction

[SrDsMe]

Posed question - is it possible to draft using soft-suction/LDH without the implementation of a Turbo-Draft? If so...do tell. Thanks

Sam
Captain
Cy-Fair Vol. Fire Dept. Station #4

[ADC120]

If you are referring to supply hose, then no. Without a pressurized source, soft hose will collapse when suction is applied.

[FWDbuff]

No, unless the laws of physics have changed.

[sjmedic2003]

FWD Buff: LMFAO.

[kuh shise]

Sam:

When you sip your milkshake and it is too thick, often the straw collapses. The straw failed because the internal pressure was lowered by you sucking on the end. Sucking means that you have lowered the pressure inside your mouth below the pressure of the air around you. Most people can lower the pressure inside their mouth by at least 20 inches of Mercury on a manometer or gauge. This is the equivalent of about 9.8 PSI drop, so on the inside of the straw the absolute pressure is around 4.9 psi. while on the outside of the straw is atmospheric pressure or about 14.7 psi absolute. The only thing preventing the straw from collapsing is the strength of the straw wall. So the same thing will happen when you try to used soft sleeve to draft. The soft sleeve is not ridgid, like hard sleeve. You can't suck milk shake up a flat straw, and you can't suck water up a flat fire hose. I see that your station houses two engines, a utility, and an ambulance. You probably need to have a sit down session with one or more of your pump operators, who should be able to help you understand drafting.

[LVFD301]

you got to think a captain on such a large department would know the answer to the quesition he posted - I suspect there is more to the story.

[Rescue101]

Seen it TRIED..........NEVER seen it WORK. T.C.

[EastKyFF]

No, unless the laws of physics have changed.

That's OK, I never studied law.

[Rescue101]

That's OK, I never studied law.

Acme's in DEEP schit AGAIN,hehe T.C.

[FWDbuff]

That's OK, I never studied law.

......

[rm1524]

So where did the coyote get all his money to keep the ACME in business for all those years?

[bruce355]

So where did the coyote get all his money to keep the ACME in business for all those years?

Not sure, I missed that episode of "Where are they now?, the life and times of Wyle E."
I heard he ended up roaming Charlie Sheens back yard though,.... strung out

[CaptOldTimer]

Posed question - is it possible to draft using soft-suction/LDH without the implementation of a Turbo-Draft? If so...do tell. Thanks

Sam
Captain
Cy-Fair Vol. Fire Dept. Station #4

About like trying to stick a wet noodle up a wildcat arz or a limp dinger in your girl friend!!!

[BULL321]

Posed question - is it possible to draft using soft-suction/LDH without the implementation of a Turbo-Draft? If so...do tell. Thanks

Sam
Captain
Cy-Fair Vol. Fire Dept. Station #4

Sure we do it all the time! What, I thought that the Norm?

[EastKyFF]

No, this is the Norm.

[BULL321]

No, this is the Norm.

I stand corrected!

[Truck_3]

There was an evolution LACFD did or used to do with 3.5" hose from an elevated static water source. Length could not be over 5 (250') sections and the water source had to be higher (elevation) then the engine. The Engineer would fill the line up to the source ensuring all air was expelled. He would then disconnect the line from the discharge and transfer it to the intake. Supposedly it would support 2 lines. 1 1.75" and 1 1.5" or two 1.5". Not really a draft as you are not going negative on the Compound gauge but still an interesting drill.

[CKirk922]

Sounds like a siphon. Interesting.

[sklump]

sorry wrong post