FIRE APPARATUS
DRIVER/OPERATOR - MOBILE
WATER SUPPLY WITH CORRECT
ANSWERS
MWS apparatuses having tanks with less than 2500 gallons and quick unloading
times are what? - ANSWER-The most efficient for use in water shuttle operations.
Larger MWS apparatuses have what? - ANSWER-Longer filling and unloading times,
they are also slower when traveling down the road, and are difficult to maneuver
around fill and dump sites. Exceeding 2500 are better for stationary water supply
operations.
What are some of the requirements per NFPA 1901 for a MWS? - ANSWER-A MWS
apparatus should be equipped with at least one external fill connection that
- Allows the tank to be filled at a minimum rate of 1000 gpm.
- Is equipped with a valve, strainer, and a 30 degree elbow.
- Has valves of slow-closing design (if three inches or longer)
Large tank discharge, a MWS should be equipped with a tank discharge on the left,
right and rear of the apparatus. Capable of discharging 90% of the tank volume at an
average rate of 1000 gpm
Hoselines
- If medium diameter MDH supply lnies are used for filling, the MWS apparatus
should have at least two external or direct tank fill intakes piped directly to the tank
- If LDH is used, one fill connection to the tank is adequate
According to NFPA 1901, Standard for Automotive Fire Apparatus, and apparatus
must carry what to be considered a MWS apparatus or tender? - ANSWER-1,000
gallons
What is the capacity of most MWS apparatuses? - ANSWER-1500 to 3500 gallons
If equipped with a fire pump, it may be referred to as a tanker-pumper or a tender-
pumper and must have a tank to pump line that is
- Capable of supplying the pump with 500 gpm until at least 80% of the water in the
tank is emptied
- At least two inches in diameter.
Dump Valves - ANSWER-The large tank discharge is commonly referred to this.
NPFA 1901 requires three dump valves to be installed on all MWS apparatus. Once
should discharge water from the rear, and there should be one on each side. Some
may be equipped with front dump valves, but these typically have problems meeting
the 1000 gpm flow requirement.
DRIVER/OPERATOR - MOBILE
WATER SUPPLY WITH CORRECT
ANSWERS
MWS apparatuses having tanks with less than 2500 gallons and quick unloading
times are what? - ANSWER-The most efficient for use in water shuttle operations.
Larger MWS apparatuses have what? - ANSWER-Longer filling and unloading times,
they are also slower when traveling down the road, and are difficult to maneuver
around fill and dump sites. Exceeding 2500 are better for stationary water supply
operations.
What are some of the requirements per NFPA 1901 for a MWS? - ANSWER-A MWS
apparatus should be equipped with at least one external fill connection that
- Allows the tank to be filled at a minimum rate of 1000 gpm.
- Is equipped with a valve, strainer, and a 30 degree elbow.
- Has valves of slow-closing design (if three inches or longer)
Large tank discharge, a MWS should be equipped with a tank discharge on the left,
right and rear of the apparatus. Capable of discharging 90% of the tank volume at an
average rate of 1000 gpm
Hoselines
- If medium diameter MDH supply lnies are used for filling, the MWS apparatus
should have at least two external or direct tank fill intakes piped directly to the tank
- If LDH is used, one fill connection to the tank is adequate
According to NFPA 1901, Standard for Automotive Fire Apparatus, and apparatus
must carry what to be considered a MWS apparatus or tender? - ANSWER-1,000
gallons
What is the capacity of most MWS apparatuses? - ANSWER-1500 to 3500 gallons
If equipped with a fire pump, it may be referred to as a tanker-pumper or a tender-
pumper and must have a tank to pump line that is
- Capable of supplying the pump with 500 gpm until at least 80% of the water in the
tank is emptied
- At least two inches in diameter.
Dump Valves - ANSWER-The large tank discharge is commonly referred to this.
NPFA 1901 requires three dump valves to be installed on all MWS apparatus. Once
should discharge water from the rear, and there should be one on each side. Some
may be equipped with front dump valves, but these typically have problems meeting
the 1000 gpm flow requirement.
