1. #1

    Join Date
    Jan 2008
    Location
    Cypress
    Posts
    2

    Default Drafting with Soft-Suction

    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

  2. #2
    Forum Member

    Join Date
    Apr 2010
    Location
    Mississippi
    Posts
    102

    Default

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

  3. #3
    Forum Member
    FWDbuff's Avatar
    Join Date
    Jul 2003
    Location
    Pee-Ayy!
    Posts
    7,404

    Default

    No, unless the laws of physics have changed.
    "Loyalty Above all Else. Except Honor."

  4. #4
    Forum Member

    Join Date
    Mar 2011
    Posts
    14

    Default

    FWD Buff: LMFAO.

  5. #5
    MembersZone Subscriber

    Join Date
    Jan 2007
    Location
    Pa Wilds
    Posts
    587

    Default

    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.

  6. #6
    MembersZone Subscriber
    LVFD301's Avatar
    Join Date
    Jun 2006
    Posts
    3,975

    Default

    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.

  7. #7
    Forum Member
    Rescue101's Avatar
    Join Date
    Jun 2001
    Location
    Bridgton,Me USA
    Posts
    8,162

    Default

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

  8. #8
    Forum Member
    EastKyFF's Avatar
    Join Date
    Feb 2001
    Posts
    3,089

    Default

    Quote Originally Posted by FWDbuff View Post
    No, unless the laws of physics have changed.
    That's OK, I never studied law.
    Attached Images Attached Images  
    "Be polite, be professional, but have a plan to kill everybody you meet.”
    --General James Mattis, USMC


  9. #9
    Forum Member
    Rescue101's Avatar
    Join Date
    Jun 2001
    Location
    Bridgton,Me USA
    Posts
    8,162

    Default

    Quote Originally Posted by EastKyFF View Post
    That's OK, I never studied law.
    Acme's in DEEP schit AGAIN,hehe T.C.

  10. #10
    Forum Member
    FWDbuff's Avatar
    Join Date
    Jul 2003
    Location
    Pee-Ayy!
    Posts
    7,404

    Default

    Quote Originally Posted by EastKyFF View Post
    That's OK, I never studied law.
    ......
    "Loyalty Above all Else. Except Honor."

  11. #11
    MembersZone Subscriber

    Join Date
    Apr 2009
    Location
    SW Missouri
    Posts
    1,156

    Default

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

  12. #12
    Forum Member

    Join Date
    Feb 2011
    Posts
    15

    Default

    Quote Originally Posted by rm1524 View Post
    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

  13. #13
    Forum Member
    CaptOldTimer's Avatar
    Join Date
    Jun 1999
    Location
    Virginia
    Posts
    7,243

    Default

    Quote Originally Posted by SrDsMe View Post
    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!!!
    Last edited by CaptOldTimer; 03-13-2011 at 05:18 PM.
    Stay Safe and Well Out There....

    Always remembering 9-11-2001 and 343+ Brothers

  14. #14
    MembersZone Subscriber
    BULL321's Avatar
    Join Date
    Jun 2007
    Location
    Western, NC
    Posts
    3,432

    Default

    Quote Originally Posted by SrDsMe View Post
    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?
    Stay Safe
    Bull


    “Guys if you get hurt, we’ll help you. If you get sick we’ll treat you. If you want to bitch and moan, then all I can tell you is to flick the sand out of your slit, suck it up or get the hell out!”
    - Capt. Marc Cox CFD

    Nothing in life is so exhilarating as to be shot at without result.
    -WINSTON CHURCHILL

  15. #15
    Forum Member
    EastKyFF's Avatar
    Join Date
    Feb 2001
    Posts
    3,089

    Default

    No, this is the Norm.
    "Be polite, be professional, but have a plan to kill everybody you meet.”
    --General James Mattis, USMC


  16. #16
    MembersZone Subscriber
    BULL321's Avatar
    Join Date
    Jun 2007
    Location
    Western, NC
    Posts
    3,432

    Default

    Quote Originally Posted by EastKyFF View Post
    No, this is the Norm.
    I stand corrected!
    Stay Safe
    Bull


    “Guys if you get hurt, we’ll help you. If you get sick we’ll treat you. If you want to bitch and moan, then all I can tell you is to flick the sand out of your slit, suck it up or get the hell out!”
    - Capt. Marc Cox CFD

    Nothing in life is so exhilarating as to be shot at without result.
    -WINSTON CHURCHILL

  17. #17
    Forum Member

    Join Date
    Dec 2009
    Posts
    63

    Default

    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.

  18. #18
    MembersZone Subscriber
    CKirk922's Avatar
    Join Date
    Apr 2005
    Location
    Watching From The Sideline Now
    Posts
    260

    Default

    Sounds like a siphon. Interesting.
    A coward stands by and watches wrongs committed without saying a word...Any opinions expressed are purely my own and not necessarily reflective of the views of my former departments

  19. #19
    MembersZone Subscriber

    Join Date
    Nov 2002
    Location
    oxford,wi,usa
    Posts
    262

    Default

    sorry wrong post
    Last edited by sklump; 04-01-2011 at 10:24 PM. Reason: wrong post

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Effect of Undersized Hard Suction?
    By Pelican631 in forum The Engineer
    Replies: 30
    Last Post: 05-04-2007, 07:43 AM
  2. Drafting with Hard Suction
    By Firefighter430 in forum The Engineer
    Replies: 5
    Last Post: 06-15-2004, 10:03 PM
  3. Drafting with Hard Suction
    By Firefighter430 in forum Firefighters Forum
    Replies: 6
    Last Post: 06-10-2004, 08:11 AM
  4. Drop Tank Ops.
    By jab1415 in forum Fireground Tactics
    Replies: 19
    Last Post: 05-21-2001, 01:43 PM
  5. RFP's
    By D Littrell in forum Apparatus Innovation
    Replies: 1
    Last Post: 09-08-2000, 06:36 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts

Log in

Click here to log in or register