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Water supply and drafting

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Water supply and drafting Objectives Understand and be able to demonstrate the different hydrant lays and hook ups Explain/demonstrate how to operate from a tender ... – PowerPoint PPT presentation

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Date added: 9 August 2019
Slides: 22
Provided by: JoeT154
Learn more at: http://feti.lsu.edu
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Tags: drafting | pump | supply | water

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Title: Water supply and drafting


1
Water supply and drafting
2
Objectives
  • Understand and be able to demonstrate the
    different hydrant lays and hook ups
  • Explain/demonstrate how to operate from a tender
  • Explain and demonstrate drafting
  • Explain alternative methods of water supply

3
Hydrants
  • There are several methods of setting up to
    operate from a hydrant, depending on the
    conditions at the scene, where the scene is, and
    how much water will be needed
  • Forward Lay
  • Reverse Lay
  • Split lay (or driveway or farm lay)
  • Spotting the hydrant

4
Forward Lay
  • Hose is laid fom the plug to the fire
  • Must have communication with the F/F at the plug
  • Engineer must clamp the line at the fire as
    he/she is making the connection to the engine

5
Reverse Lay
  • Used when there is less room to place the engine,
    the engine needs to draft, or the scene may be
    hazardous
  • Engine is stripped of needed equipment, and lays
    hose from fire to the water supply

6
Split Lay
  • Used for long driveways and farm roads
  • Two engines lay from the end of the driveway one
    up the driveway to the fire, and one from the
    driveway to the water source

7
Spotting the Hydrant
  • This is hooking to a hydrant that is right next
    to the incident
  • Most engines carry short 20 lengths to perform
    this connection

8
Forward and split lay connections
  • When you have finished laying the line to the
    fire, CLAMP THE HOSE!
  • Next, pull the rest of the 50 section off of the
    bed to ensure you have sufficient slack
  • Hook hose to your 2 ½ suction, call for water,
    and release the hose clamp

9
Drafting
  • This is a common method of establishing rural
    water supply, and can be done from a dry hydrant,
    a porta-tank, or from a pond or lake
  • Drafting isnt actually sucking water, we are
    creating a vacuum in the pump and atmospheric
    pressure forces the water into the pump

10
Drafting
Vacuum is created in pump by primer
Normal air pressure presses down on water and
forces it into the hard suction lines
11
Rules for Drafting
  • All connections must be as air tight as possible
  • All other discharges, intakes, the tank fill, and
    tank to pump must be closed
  • 10 to 12 is our maximum vertical distance from
    surface of water to the pump that we will be able
    to establish a draft
  • You will need to flow as least some kind of
    discharge to hold the draft once it is
    established.

12
Drafting using the primer
Primer pump sucks air out of centrifical pump
Negative pressure created in intake lines and
pump, water is forced by normal air pressure into
the lines
Air is exhausted under vehicle
13
Making a hard suction connection
  • Hook up the engine side of the draft lines first
  • Make sure all connections are as airtight as
    possible, use rubber mallet

14
Flat Bottom strainers
  • Flat bottom strainers are used for porta-tanks,
    where they can draft down to 2 inches of water
    remaining in the porta-tank
  • This type of strainer prevents whirlpools as well

15
Barrel strainers
  • These are for drafting out of ponds, lakes,
    streams
  • This strainer has to be kept off of the bottom of
    the pond or lake to prevent drafting silt and
    sand
  • Needs 24 of water all around the strainer

16
Preparing to draft
  • Make sure all valves are closed, incvluding tank
    to pump, and tank fill.
  • Be ready to flow water once a draft is
    established, otherwise you wont be able to hold
    the draft

17
Drafting
  • Pull the prime lever, and hold it until the
    compound gauge shows a vacuum, pressure gauge
    shows pressure on the discharge side
  • You may hear the water flowing into the pump as
    well
  • Primer oil will leak from the bottom when
    drafting
  • Dont hold the prime lever for more than 20
    seconds at a time

18
Drafting
  • Once a draft is established, slowly open the
    discharge of the line you intend to operate
  • Watch the pressure gauge if you have a sudden
    loss of pressure as you are opening the
    discharge, you have lost your draft.

19
Portable Pumps
  • West Douglas has two types of portable pumps
  • 250gpm pump on R133
  • Mark II wildland portable pumps on T131 T134

20
Ejectors
  • Ejectors work like foam eductors, using a small
    flow of water to draw more water into bigger
    lines
  • Can operate 100 away from engine

21
Jet Strainers
  • These strainers are flat bottom strainers with an
    1 ½ connection that is pumped by one of the
    engines discharges
  • The incoming water forces more water through the
    strainer and into the intake lines
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