Flashcards in Chapter # 16 Apparatus Testing Deck (58):
Name the two types of apparatus testing.
Pre-service test and Service test.
Includes manufacturer's test, pump certification test, and acceptance test.
Conducted on at least a yearly basis while the apparatus is in service.
Standard on wild land apparatus.
Standard for Aircraft Rescue and Fire fighting vehicles.
Who performs manufacture or certification test?
The manufacture or Underwriters Laboratories.
What pre-service test may fire department personnel be involved with?
What test are required by NFPA 1901 for a manufacturer test not including a pump certification test?
Road Test, Hydro static Test.
Should the apparatus be fully loaded when a road test is conducted?
Name some examples of a road test.
Accelerate to 35 mph from standing within 25 seconds (do this twice in opposite directions).
Must achieve a minimum top speed of 50 mph.
Come to a full stop from 20 mph within 35 feet.
Parking brake must conform to the listed spec.
Determines whether the pump and pump piping can withstand pressures normally encountered during fire fighting operations.
What psi and for how long are pumps tested hydro-statically?
250 psi for 3 minutes.
Are performed to make sure the fire pump system operates in the manner for which it was designed after the pump and components are installed on the apparatus chassis.
Pump Certification Test.
Must be performed by a independent testing organization, results must be stamped on a plate that is affixed to the pump panel of the apparatus.
Pump Certification Test.
List the required pump certification test according to NFPA 1901 for a apparatus equipped with a 750 gpm or larger fire pump.
Pump Test. Pumping Engine Overload test. Pressure control system test. Priming device test. Vacuum Test. Water tank-to-pump flow test. Internal intake pressure relief valve test. (those pumps that are certified for less then 750 gpm must have all the same test except no Engine Overload test is done).
How long is a pump running during a Pump certification test?
How long is the pump running for a service test?
Are conducted to assure the purchaser that the apparatus meets the bid specs at the time of delivery.
What should be included in a Acceptance test?
Another pump test. Pumping Engine Overload test (if the purchasing jurisdiction is 2,000' above sea level).
Standard for service test of fire pump systems on fire apparatus.
According to NFPA 1911 when should a pump under go a service test.
At least once a year or when it has undergone extensive pump repair or power train repair.
List the test included in the NFPA 1911 service test.
Engine speed test. Priming device test. Vacuum test. Pumping test. Overload test. Pressure control test. Gauge and flow meter test. Tank-to-pump flow rate test. Internal intake pressure relief valve test.
If drafting when performing a service test, how much hard intake hose should be used?
When performing a service test, what should the air temp be and the water temp be?
Air temp = 0-100 F Water temp = 35-90 F.
How many feet of lift is lost per 1,000' of elevation gain?
When performing a service test, an appropriate amount of hoselines should be laid out to pump the capacity of the pump. What is the minimum size of hoseline that can be used?
At what distance of movement should a hose be removed it the scribe mo ark of the coupling moves?
Pressure correction equation.
Lift (ft) + Intake hose friction loss / 2.3
When would a pressure correction need to be made?
When performing a service test from a draft. Minus the pressure correction from the PDP gauge to get the correct PDP.
At what PSI's is the pump service test performed at?
150,165,200, and 250.
NFPA 1911 requires that all gauges used to test be calibrated when?
Within 60 days of the pump service test.
List the equipment needed to perform a pump service test.
A intake pressure gauge reading from 30hg to 150 psi. A discharge gauge reading from 0-400psi. Pitot tube reading from 0-160psi. Straight stream nozzles of correct sizes to match the volume pumped. Ropes, chains, or test stands. Revolution counter or hand tachometer. FD or insurance agency forms.
Recommended but not required = Two 6' lengths by 1/4" 300 psi test hose with screw fittings. Clamp to hold pitot tube to nozzle. Test stand for gauges. Thermometer. Stopwatch or watch with sweep second hand.
What is the engine speed test?
A test to ensure that the engine ideals at the same speed as the manufacturer originally designed it to.
What is the vacuum test?
Checks the priming device, pump, and hard intake hose for air leaks.
No more then 10 inches should be lost in how long during a vacuum test?
Checks the overall condition of the engine and the pump.
The pumping test.
Test to make sure that they maintain a safe level of pressure on the pump when valves are closed at a variety of discharge pressures.
Pressure control device test.
When performing a test on the discharge pressure gauge, a gauge that is off the set mark by how much needs to be repaired,re calibrated, or replaced?
10 psi. (10% if using a flowmeter)
Test to ensure that the piping between the water tank and pump is sufficient to supply the minimum amount of water specified by NFPA 1901 and the design of the manufacturer.
Tank-to-pump flow test.
Pumps with a capacity of 500 gpm or less should be able to flow how many gpm from their tank-to-pump line?
Pumps with a capacity of greater then 500 gpm should be able to flow how much gpm from their tank-to-pump line?
At least 500 gpm.
The pump should maintain its minimal flow rate until how much of the tank water is gone?
What are the two options if a fire pump test to less then 90 % of its capabilities when it was new and underwent certification testing?
Take the pump out of service and restore it. (preferable option)
Give the pump a lower rating based on the test results.
List some probable causes if the pump fails to meet the requirements of the service test.
Transmission in wrong gear. High gear lock out not functioning. Clutch slipping. Engine overheating. Muffler clogged. Tachometer inaccurate. Engine governor malfunctioning. Intake hose to small. Intake strainer submerged incorrectly. Intake screen clogged. Wrong strainer is being used. Lift is higher then 10'. Intake hose clogged or lining collapse. Excessive air leaks on intake side of the pump. Pump impellers are clogged. Pump or intake hose not fully primed. Relief valve or pressure governor malfunctioning. Transfer valve in wrong place. Inaccurate gauges. Pitot tube partially clogged. Nozzle to large. Seized turbocharger. Excessive wear on impeller clearance rings.
What two methods are generally used to test foam proportioning equipment for proper operation?
Testing the foam-to-water solution concentration that the system and equipment produce.
Testing the rate at which foam concentrate is consumed in proportion to a known flow of water through the system.
When does NFPA 1901 require foam system accuracy testing to be performed? When does it not?
Required = Prior to the apparatus being delivered from the manufacture.
Doesn't require it = On a yearly basis.
Name four methods for testing a foam proportioning system according to NFPA 1901.
Foam concentrate displacement test. Foam concentrate pump discharge volume method. Foam solution refractivity testing. Foam solution conductivity testing.
Measures the accuracy of foam proportioning equipment by checking the volume of foam concentrate that is drawn through the system while it is in operation. The volume of water drawn (water is substituted for foam concentrate) from a calibration tank over a measured period of time is then correlated to the actual percentage of foam concentrate that the system would be proportioning at the test flow rate.
Foam concentrate displacement method.
This procedure may be used to test the volume of foam concentrate that is proportioned into the fire stream in some direct injection type foam proportioning systems. The discharge from the foam concentrate pump is collected in a calibrated container for a specific period of time.The volume is then correlated to the actual percentage of foam concentrate that the system would be proportioning at the test flow rate.
Foam concentrate pump discharge volume method.
Used to test the quality of foam after it has been created. This test method is recommended for protein and fluoroprotein based foams solutions. A refractometer is used to measure the light that comes through the foam. A base calibration curve is first made by mixing the desired foam proportion and also one that is 0.3% more and one that is 0.3% less. Each is measured with the refractometer and plotted on a graph. A sample of the foam solution that is made by the proportioning system is then measured and plotted on the graph.
Foam solution refractivity testing.
How long should you wait before taking a reading from a refractometer so that it can adjust to temp differences?
Used to test the quality of synthetic based foams. Relies on a foams ability to conduct electricity to verify their actual composition.
Foam solution conductivity testing.
The ability of a substance to conduct an electrical current.
What are the three methods for performing a conductivity test?
Direct reading. Conductivity comparison. Conductivity calibration curve test.
Used when a direct reading conductivity meter is available. Meter must first be zeroed in the water that will be used in the foam. If the meter doesn't given readings in percent of foam concentrate a calibration curve must be made.
Direct Reading Conductivity Testing.
Used when a conductivity meter that reads out in units of microsiemens per centimeter (ms/cm) is available. A reading of the water is taken then a reading of foam solution is taken. Then use this formula.
% of concentration in solution = (conductivity of solution) - (conductivity of water) / 500.
Conductivity Comparison Testing.
Is performed by using a handheld, temperature-compensated conductivity meter. First a calibration curve is made in the same way they are for a refractory test except the readings are from the conductivity meter.
Conductivity Calibration Curve Testing.