TB 62- 2" High Rise Hose System Flashcards
What are the specifications of the hose itself?
- Single jacket construction utilizing nitrile rubber impregnated synthetic yarn as the cord material
- 50 foot lengths with 1 1/2” couplings
- Ribbed to reduce wear & increase grip
- Shoulder of couplings are tapered to reduce snagging
- Blue in color
The high rise hose is susceptible to damage than double jacketed hose as it has a tendency to incur very small punctures, however these punctures will not what?
Tear or increase in size even under extreme pressure
Use of this hose for purpose other than hose packs should be avoided, a benefit of this hose, especially when working in the confined spaces of stairwells and interior hallways is what?
Its ability to resist kinks
Under pressure, how far can the hose be bent before it will kink?
Within 12 inches before it will kink
When supplying the standard 75 psi nozzle pressure to the 1 1/2” 200 gpm tip, your flow will be what?
200 gpm with a friction loss of 35 psi per 100 feet of 2” hose
What is the primary objective of a company assigned to attack the fire?
Get one line into operation
What does each hose pack consist of?
- Two 50’ sections of lightweight blue hose
- One 1 1/2” complete 200 gpm spray nozzle
- One 2 1/2” x 1 1/2” reducer
- Five 2’ ladder straps
What does the pigtail assembly consist of?
- One 8’ section of lightweight 2 1/2” hose
- One 2 1/2” to 1 1/2” gated wye
- One lightweight folding spanner
- Two ladder straps
- One 2 1/2” 60 degree elbow
You can begin making the pack with the hose which kind of what?
Either hose rolled, or stretched out straight
How are the hose packs fashioned?
Using a 30-45 minute air bottle to form a “U” shaped single layer or double layer pack
The single layer method produces a pack _ inches taller than the double layer method
8
When assembling the hose pack, the female coupling of the first section of hose should be how many inches below the gauge of the bottle?
10 inches below the gauge of the bottle with the reducer to the female coupling
When you reach the male coupling of the second section, attach the nozzle and position it wear?
Base of the pack on the same side as the female coupling you began the pack with
To secure the hose pack, place a strap about how many inches above the bottom of the pack on each side?
8 inches
Placing the straps eight inches or so above the folds will help prevent what?
Permanent kinks in the hose
When completed, how much will the pack weight?
38 pounds
What are the approximate dimensions of the pack?
- 40” tall by 22” wide for the single layer pack
- 32” tall by 16 “ wide for the double layer pack
How much does the pigtail assemble weight?
10 pounds
How is the pigtail made?
By rolling the gated wye inside the hose and elbow
Buildings built prior to 1960 were limited to how high an were required to have what kind of system for our use?
Limited to 150 ft Dry Standpipe (Class I) System
Buildings built between 1960 - 1974 were required to have what kind of system?
Combination (Class III) Standpipe System
What does Combination (Class III) Standpipe system mean?
- 1 1/2” interior wet standpipes for occupants is supplied by the same riser as the 2 1/2” outlet for our use
- Pressure supplied by on-site fire pump
- May also have 2 1/2” hose with 1” straight tip (located in hose cabinets in stairwells above 4th floor)
What kind of standpipe system is required in buildings built since 1974?
Combined Standpipe Sprinkler System
What are some specs on the combined standpipe sprinkler system?
-Use the same riser to supply FD outlets and the sprinkler system
In a Dry Standpipe (Class I) System, the outlet is located where?
Adjacent to the fire escape, usually directly above the inlets at the street level
*building upgraded, outlets have been moved inside to a new enclosed stairwell
If you need to extend off a 1 3/4” hose line that you have drop bag, what is the friction loss?
50 psi per each 100 feet of 1 3/4”
What is the friction loss if you supply your hose pack from a 1 1/2” line?
approximately 130 psi, prohibitively high
In a Dry Standpipe Class I System, if the outlet is adjacent to the fire escape, how can you use the pigtail hose?
The eight foot section can be used to bring the gated wye around so the 1 1/2” outlets are pointed in or at the window, then use one of the straps to secure it to the balcony
In a Dry Standpipe Class I System, if the standpipe is in a stairwell, attach the elbow and gated wye directly where?
Directly to the outlet, using the elbow will get the hose coming off the outlet/gated wye down onto the landing instead of sticking out blocking the landing
In a Combination Standpipe Class III System, what is a drip-cock used for?
Attached to the outlet to prevent any water that might leak from the valve from getting into the hose while it is stored on the rack
In a Combination Standpipe Class III System, has orifice plates specifically engineered to reduce what?
- The flow of water supplied from a particular outlet
- Size of the orifice plate is determined by the static pressure on the supply side of an outlet
The higher the pressure in the system, the what in reference to a orifice plate?
- The smaller the inside diameter of the orifice plate will be
- Higher pressures will be found on the lower floors of a building
- Orifice plate not regulate pressure, it restricts flow
In a Combination Standpipe Class III System, where can the orifice plate be found at?
- Soldered to the outlet itself
- Behind the gasket on the drip-cock
- Soldered to the male end of the drip-cock
- Behind the gasket on the 2 1/2” hose
What are ways to removed the orifice plate?
- Removing the gasket, removing the orifice plate, and replacing the gasket; or
- using a slotted screwdriver or your channel locks as a pry bar to break the plate off of the opening
In a Combination Standpipe Class III System, when deploying the hose pack, if the orifice plate has been removed, the outlet should be opened how?
One and One-half turns, then adjusted from there
In a Combination Standpipe Class III System, if the orifice plate has not been removed, how should you open the outlet?
Open the valve fully
Once the hose pack is loaded, one ff should stay at the gate valve, why?
To insure no one accidentally adjusts your outlet
If conditions n the stairwell will not allow you to connect to the standpipe on the fire floor, where can you connect?
On the floor below and easily pull this hose up the stairwell
Ideally, flake the hose up the stairs from the fire floor
In Combined Standpipe Sprinkler System built since 1974, are required to be what?
Fully sprinklered and also have a standpipe for our use
In Combined Standpipe Sprinkler System, utilizes what kind of valve?
Pressure Reducing Valve (PRV)
When does the system utilizes a PRV?
When pressure at the outlet exceeds 150 psi
Is it possible in new construction to encounter orifice plates on the upper floors where the system pressure falls below 150 psi?
Yes, typically be the top 6 to 8 floors
In Combined Standpipe Sprinkler System, when connecting to the system, connect what?
Elbow and gated wye directly to the outlet, open fully!
In regards to extending the hose line what are the two methods?
- Laying out pack in stairwell, take nozzle and female coupling of dry line down the hall to the nozzle, shut down nozzle, remove tip and attach coupling, strapping the shut off butt open
- Leave hose pack on back of FF, remove the reducer and two of the hose straps, extend line, shut off nozzle on wet line and attach dry line , strapping off shut off butt
For maintenance of the hose pack, what should you do after each use?
- Scrub the outer jacket to free it of dirt and fire debris
- Drain excess water
- Then form pack
What is the test pressure of the hose?
300 psi
