Ladders 1 Portable Ladders Flashcards
General Knowledge
Sizes/closed lengths/weights
2.1.1
Extension Closed
Ladders Length Weight
35’ 20’ 135 lbs.
25’ 15’ 100 lbs.
24’ 14’ 80 lbs.
16’ 10’ 70 lbs.
The marine companies carry 12 foot and 20 foot portable hook ladders with wood beams. They are painted ______ except for the hooks and for 18 inches at the base of each beam, which are painted ______.
Fill in the blanks
2.2
black
white
These ladders do not have metal spurs at the base; there are simply the squared edges of the wood beams.
When an aluminum ladder fails it will break apart similar to a wooden ladder.
True or false
4.3
False
Aluminum ladders in general are tough. They will dent but will not chip or crack when subjected to severe impact nor will they fail suddenly because of overloads. They will bend but not break, as wood does.
If an aluminum ladder has been subjected to excessive heat exposure at a fire, even for a
brief period, it may have lost its heat treatment. This may affect its load carrying capacity, even though the metal shows no signs of any change. A discoloration may indicate a loss of structural strength. In such cases, who shall be notified?
5.3
Technical Services Division shall be notified.
Upon receipt of spare apparatus ladder brackets should be checked for their holding capabilities as they relate to the unit’s ladder inventory. If ladders cannot be held securely, what procedures should be followed?
6.1.2 A&B
The Technical Services Division shall immediately be notified by telephone. A requisition shall be forwarded and an entry made in the company journal. Provision shall be made to secure ladders as safely as possible pending repair or relocation of ladder holding devices by the Technical Services Division. These temporary fastenings shall be checked after each response.
If the officer on duty feels that a particular ladder cannot be temporarily secured to the spare apparatus in a safe manner, and there is a danger of loss of the ladder during response, what actions shall be taken with the ladder?
6.1.2 C
The ladder shall be left off the apparatus. An entry of this action shall be made in the company journal.
The numerical length of a ladder shall be marked on the side of the rails within __ inches of the end of the ladder.
Straight ladders - The ladder length shall be marked on ____ end of each rail.
Extension ladders - The ladder length shall be marked at the ____end only of each rail of the bed ladder.
Ladder length markings shall be visible when ladders are stored on the apparatus.
Fill in the Blanks
7.1,7.1.1,7.1.2,7.1.3
12
each
butt
The unit designation shall be marked within ___ inches of each butt end as outlined in Sections 7.1.1 and 7.1.2 for numerical ladder length markings.
Fill in the blank
7.2
18
If another apparatus arriving at a fire or emergency is positioned closer than 20 feet to the rear of the ladder apparatus, what ladders cannot be removed from these racks due to insufficient clearance?
8.1.1
20 foot straight and/or 35 foot extension ladders are carried in the internal slide-in racks on many ladder company apparatus. If another apparatus arriving at a fire or emergency is positioned closer than 20 feet to the rear of the ladder apparatus, the 20 foot straight or the 35 foot extension ladder cannot be removed from these racks due to insufficient clearance.
Ladder Climbing Angle - Climbing angle for a ground ladder is approximately 65-75 degrees. The 65-75 degree angle allows the ladder to provide its maximum strength and best service. An angle steeper than 75 degrees increases the chances of the climber falling off and sustaining injuries. Ladders angled less than 65 degrees require a reduction in maximum loading. A simple formula used to obtain a 75 degree angle is to place the base of the ladder at a distance from the vertical plane equal to 1/4 the total working length of the ladder. The working length is the distance from the base of the ladder to the top of what?
8.4, 8.4.1 ,8.4.2, 8.4.3, 8.4.4
The working length is the distance from the base of the ladder to the top of its SUPPORT.
Rules for Portable Ladder Placement. Placed at a window - Placed at a roof - Placed alongside a fire escape on a building wall - Placed against a fire escape -
- 5.1 A,B,C,D
- Tip shall be level with window sill.
- Tip shall be at least 2 feet above the roof or parapet.
- Tip shall be 1 to 3 feet above the fire escape railing.
- Tip shall be slightly above the fire escape railing.
In order to prevent slippage of the butt, or movement of the top, of a raised portable ladder, it is important that it be butted by a member. In any case for fire, emergency or rescue work, a butt man shall be used to stabilize the ladder and
prevent slipping. The butting member places what footon the bottom rung of the ladder?
8.6.1 A
The butting member places his left foot in the center of the bottom rung of the ladder and maintains a downward pressure. His right foot is positioned behind him at a comfortable distance to maintain balance and provide resistance against ladder movement.
If a member is working off one side of the ladder, the butt man moves his foot from the center of the bottom rung of the ladder to what side of the ladder?
8.6.1 C.
If a member is working off one side of the ladder, the butt man moves his foot from the center of the bottom rung of the ladder to the side opposite
the one from which the man is working, and places his foot next to the beam. This will prevent the bottom of the beam from shifting due to the
relocated weight of the member working on the ladder.
The butt man must be aware of the force that causes the outward slippage of the butt of the ladder. This force is in direct proportion to the climbing member’s weight, _________ as he ascends the ladder, and is maximum at the ___ of the ladder.
Fill in the Blanks
8.6.2
increases
top
Because of this, extra care must be exercised when a member receives a victim at the top of the ladder.
The aluminum portable ladder, if it is to be left unattended, should be secured at the tip by what member?
8.6.3
The aluminum portable ladder, if it is to be left unattended, should be secured at the tip by the first member that climbs the ladder. This is to prevent the ladder from being dislodged from its position by the wind or by the impact of water from a hose line or a large caliber stream.