What is the difference between dual pumping and tandem pumping

As Pumper B opens its discharge gates to supply hoselines, Pumper A throttles up to maintain proper discharge pressures. Pumper A slowly gates down its large gated intake until the residual pressure is near zero while throttling up to maintain discharge pressures.

As Pumper B opens discharge gates to supply hoselines, Pumper A throttles up to maintain proper discharge pressures. As dual pumping is practiced, operators will discover that the technique may be adapted to better fit the needs of their equipment.

Knowing the various methods, practicing them, and employing creativity will increase our options for fighting fire with water. Tandem and dual pumping are two such options.

Left Pumper A pumps psi to Pumper B. Right Pumper B receives psi, then pumps a total of psi to the fire department connection.

Photos by author. Left Pumper B. Note the lashed, secured discharge lines. Right Multiple smaller lines are used to supply the fire department connection. This makes the operation safer: If a line should burst, the water supply to the firefighters will not be interrupted. Above left Large gated intake valves allow for easier water supply operations.

Above right Pumper B right positions next to Pumper A for the intake-to-intake connection. Below left A completed intake-to-intake connection. Below right Dual pumping in operation. He is a Florida-state certified EMT, fire officer instructor, and fire inspector instructor.

Sign in. Forgot your password? Clarion Events Privacy Policy. Password recovery. Caution should be used as to not over pressure at which the hose is annually tested. At the same time allow water to waste through an open discharge dump line. Dump discharge. The engine is then engaged and the throttle advanced to establish the specified pressure while adjusting the valve on the uncapped discharge dump line to maintain 50 p. Source Engine. The engine at the fire establishes the pump discharge pressure needed to provide the required nozzle pressure on all lines.

All engines will set relief valves or pressure governors. The engine at the fire is shut down first by slowly decreasing pressure until the pump can be disengaged. Each engine in turn reduces pressure gradually and allows the water to waste after the pump is disengaged. Good communications is a must for a successful relay operation. Fuel System The fuel system supplies the air and fuel necessary for an engine to produce power. Tandem Pumping Video.

Nozzle Pressure. Water supply and drafting. Similar presentations. Upload Log in. My presentations Profile Feedback Log out. Log in. Far enough away so that the truck is not in the collapse zone.

Definition C. Term When positioning for fire attack, with no fire conditions evident, which of the following in NOT a responsibility of the DO? Remain in the vehicle. Enter the structure and investigate the situation. Prepare to pull attack hoselines if the need arrises.

Definition B. Term What is the first tactical priority at any fire incident? Life safety. Financial repercussions. Always leave yourself a way out. Choose an unpaved surface over a paved surface. Position uphill from the incident whenever possible. Attempt to position the apparatus upwind of the incident.

Term What size in the collapse zone? One half the height of the building. One times the height of the building. One and one-half times the height of the building. Two times the height of the building. Term Which of the following is NOT an indicator of imminent building collapse?

Bulging walls. Definition D. Term When positioning pumpers to support aerial apparatus, which apparatus should have the optimum operating position? Engine companies. Wildland apparatus. Pumping apparatus. Aerial apparatus. Definition A. Rescue companies. Engine company. Term Pumpers providing water for elevated stream operations should position as close as possible to the: A. Term When positioning to support fire department connections FDCs , pumpers will generally position as close as possible to the: A.

Sprinkler or standpipe FDC. Term When are drafting operations required? When the attack pumper is only a short distance from a hydrant. Term Which drafting sites should be given preference? Those accessible from a paved surface. Those rqquiring a large amount of lift. Those requiring a large amount of suction hose. Those far away from bridges and boat ramps. Term What is the first step in positioning for drafting operations? Attach a rope to the end of the strainer. Drive the pumper into the final draft position.

Connect the hard intake hose and strainer to the pumper. Term Which type of juristiction usually installs dry hydrants at drafting sites?

City B. Rural C. Municipal D. Definition B: Rural Term Which of the following is the only type of hard intake hose that should be connected to a fire hydrant?

Hard intake hose with gate valves attached. Hard intake hose with butterfly valves attached. Term What is the preferred type of hose for connection to a fire hydrant? Hard intake hose. Hard suction hose.

Small diameter intake hose. Large diameter intake hose. Term When should connection to the 2. When the maximum flow from a hydrant is needed. When the maximum flow from a hydrant is not needed. When medium diameter intake hose is not available. When small diameter intake hose is not available.

Term Which of the following is a disadvantage of connecting to the 2. It is difficult to set up. It creates rigidity in the hose. It increases maneuvering time. It limits the amount of water that can be supplied. Term What is the difference between dual pumping and tandem pumping? In dual pumping the pumpers are positioned closely together. Term After life safety, what is the highest priority for most wildland fire fighting operations? Protection of wild animals.

Protection of vegitation. Protection of structures. Protection of national parks. Term The boundry between the wildland and structural development is often reffered to as: A. Term Most structures threatened by wildland fires are surrounded by: A. Other structures. Commercial properties. Dry, flammable vegitation.

Moist, nonflammable plants. Term When positioning wildland fire apparatus, what should be done to avoid positioning in flammable vegitation? Ignite fuel. Stockpile fuel. Hose down fuel. Scrape fuel away. Power lines. Trees or snags. Pressure cessels. Underground fuel tanks. Term To reduce the risk to engine crews as much as possible at a wildland fire, their attack must always be begun from a n : A. Anchor point. Barrier point. Blackened area. Unburned area. Term What should the DO do during a wildland fire attack when operating the apparatus under conditions of reduced visibility?