Epoxy: Impingement
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Question 1 of 45
1. Question
MRL striping trucks are equipped with two emergency stop buttons; one in the cab and one on the rear operator’s console.
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Question 2 of 45
2. Question
When the Emergency Stop button is activated it will abruptly stop the striping system equipment and the compressor engine. The chassis and safety lights will be unaffected and will still be able to operate, only the striping apparatus is shutdown.
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Question 3 of 45
3. Question
If the E-Stop has been activated it is recommended all striping function switches, master switch, furnaces, pumps, guns, etc. be turned off prior to resetting the E-Stop switch. It is necessary to bleed the compressed air from the air compressor receiver tank prior to re-starting the air compressor.
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Question 4 of 45
4. Question
Hydraulically driven rotary pumps and load hoses are used to transfer catalyst and resin from totes to material storage tanks on the truck.
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Question 5 of 45
5. Question
Three separate diesel fired heaters and circulation pumps are used to heat the catalyst and resin to proper temperature for effective impingement mixing.
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Question 6 of 45
6. Question
The recirculation system allows continuous flow of material from the high-pressure pumps back to material tanks when not applying material to the road.
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Question 7 of 45
7. Question
Recirculation helps to reduce warm-up time and keeps the system at a constant temperature when spraying is temporarily interrupted.
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Question 8 of 45
8. Question
Restrictor valves contain orifices that are sized to create the same pressure drop as spraying material through the guns.
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Question 9 of 45
9. Question
Avoid recirculating material at high pressure for long periods of time. Excessive recirculating will create air bubbles in the material and cause premature pump wear.
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Question 10 of 45
10. Question
Significant increase in resin or catalyst material pressure while recirculating indicates a plugged orifice.
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Question 11 of 45
11. Question
Sort the following steps in the correct sequence for clearing a clogged orifice.
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Turn the corresponding restrictor valve 180° to clear the orifice. The procedure may have to be repeated to clear the orifice.
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Determine which orifice is plugged by monitoring material pressures.
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Locate the corresponding restrictor valve at the backside of the material tanks.
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Question 12 of 45
12. Question
Hydraulically driven, positive displacement piston pumps provide the pressure and proper mix ratios for plural component striping materials.
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Question 13 of 45
13. Question
MRL recommends material pressures of at least 2500 psi for proper impingement mixing of catalyst and resin.
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Question 14 of 45
14. Question
When resin pump maintenance is required, both pumps need to be rebuilt.
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Question 15 of 45
15. Question
The catalyst pump does not require maintenance as often due to the lack of abrasive compounds in the material.
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Question 16 of 45
16. Question
The high-pressure heat exchangers provide the operator with the capability to trim material temperature and viscosities for optimum
material mixing. -
Question 17 of 45
17. Question
Material hoses are rated for 3,500 psi working pressure and 12,000 psi burst pressure.
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Question 18 of 45
18. Question
There are three separate 12-volt DC electrical systems on your plural component striping truck: the chassis electrical system, an air compressor electrical system and a hydraulically driven alternator.
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Question 19 of 45
19. Question
The truck ignition switch must be on for the Warning lights and Video systems to be operational.
Sort elements
- Warning lights installed on the truck are powered from this electrical system. Video systems, if installed, are also powered by this electrical system. The truck ignition switch must be on for these systems to be operational.
- The compressor engine's alternator and battery supplies electrical power to the main electrical box via a 100 amp circuit breaker located in the compressor.
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Chassis Electrical System
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Compressor Engine Electrical System
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Question 20 of 45
20. Question
The timing system turns on solenoids for material guns, bead guns, blow airs, cart lifts and some relays as applicable.
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Question 21 of 45
21. Question
The operator’s switch boxes provide the operator with a series of switches to control the spray guns and bead guns.
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Question 22 of 45
22. Question
From the options below, match the function with its description.
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- opens the ball valves; materials (resin and catalyst) flow through the valves to the MRL heat exchanger, restrictor valves and to the material tanks.
- closes the ball valves stopping flow to the tanks; hydraulic oil flow to the motor on top of the high-pressure pumps is also shut off until the spray guns are turned on.
- Bead guns turn on/off with the spray guns.
- Bead gun on/off is adjusted to ensure full bead coverage, using the Bead +/- switches on the console.
- Control operation of blow air solenoids located under the deck between the operator stations.
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CIRC
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PAINT
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Glass: AUTO while in SOLID
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Glass: AUTO while in SKIP
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Air – Auto/Off/Test Switches
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Question 23 of 45
23. Question
From the options below, match the function with its description.
Sort elements
- Turns the spray gun on, if it is in PAINT, regardless of SOLID/SKIP and START/STOP switch positions.
- Spray gun is on and the Timer system counts footage when PAINT/CIRC switch is in PAINT and START/STOP is in START.
- Spray gun comes on with the START switch, sprays length and cycle set and displayed on the console.
- Outside bead guns come on with #1 yellow and #3 white. Inside bead guns come on with #2 yellow.
- Outside and inside bead guns come on with any spray gun.
- Controls hydraulic directional valves used to lift the carriages.
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Gun On Pushbuttons
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Paint – SOLID
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Paint – SKIP
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4" Glass
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8" Glass
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Carriage Up
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Question 24 of 45
24. Question
From the options below, match the function with its description.
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- Releases hydraulic lift pressure and applies compressor system air pressure to the top of the lift cylinder. Solenoid and regulator assembly are located near the carriage lift directional valves.
- The Timer system remembers two skip cycle settings for each switchbox. Toggle the ALT CYCLE switch to display and set skip cycles at the console.
- Select double drop or single drop bead gun operation for application and calibrating.
- Lengthen or shorten skip cycle for retrace application.
- Interrupts spray, bead, blow air and footage counter operation while maintaining skip cycle.
- Allows spray, auto bead, auto blow air and footage counter operation.
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Carriage Down
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Alt Cycle
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Beads – Tandem/Front/Rear
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Adv/Ret
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Withhold
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Start/Stop
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Question 25 of 45
25. Question
Console switchbox controls functions for:
a. Skip length, cycle length and skip bead application.
b. Footage displays and calibration parameters.
c. Meter reset options. -
Question 26 of 45
26. Question
Match each of the four switches (left and right) with its correct description below.
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- used for centerline carriage guns (#1 yellow, #2 yellow and #3 white).
- are used for edgeline carriage guns.
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Four switches to the left of center
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Four switches to the right of center
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Question 27 of 45
27. Question
Match the term with its correct description below.
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- will normally be 0.2 to 0.5 feet longer than desired actual length of the applied stripe. This is because the gun turns off faster than it turns on.
- is the distance from start of a skip to start of the next skip.
- should match the CYCLE setting exactly. If it doesn't, the Skipline calibration needs to be checked.
- is the default display when the Master switch is turned on. Truck speed is displayed in the upper right-hand corner of the STRIPE/CYCLE display.
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Set length
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Cycle
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Actual applied cycle
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The STRIPE/CYCLE display
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Question 28 of 45
28. Question
Match the term with its correct description below.
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- control bead gun on/off in relation to spray gun.
- means the bead guns will turn on/off before the spray gun turns on or off.
- means the bead guns will turn on/off after the spray gun turns on or off.
- will have to be adjusted when changing between centerline white and yellow skips, and, if application speed changes.
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BEGIN/END switches
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A "+" displayed at Begin or End
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A "-" displayed at Begin or End
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Bead registration
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Question 29 of 45
29. Question
The bead registration function works only when timer is in skip.
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Question 30 of 45
30. Question
To get bead coverage on the end of solid lines place the bead gun to TEST until after the spray gun is shut off.
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Question 31 of 45
31. Question
Match the term with its correct description below.
Sort elements
- Check oil level on a daily basis and fill with clean AW46 grade hydraulic oil as necessary to maintain proper level.
- a critical component in keeping your hydraulic system operating at the proper temperature.
- Lateral extension of the gun carriages is controlled by hydraulic cylinders and the orbitals (steering wheels at the operator's stations.)
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Hydraulic reservoir
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Oil cooler
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Gun carriage extension cylinders
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Question 32 of 45
32. Question
The air system provides compressed air for:
► Bead tank pressurization and bead transport
► Bead loading venturi (creates a vacuum in tank for transfer of beads)
► Blow air for cleaning the road surface -
Question 33 of 45
33. Question
Match the term with its correct description below.
Sort elements
- All bead tanks are equipped with a particulate filter (5 micron) that will remove most of the water from the compressed air.
- High velocity compressed air creates a vacuum as it passes through this. The vacuum is used to transfer beads from the tote or drum into the bead tank.
- used to secure the load hose to the bead tank fill port while loading beads. The camlocks must be completely rotated against the coupling body to ensure it is properly secured.
- a long cylindrical tube located below the striper deck, is used to reduce the noise associated with the discharge of air from the venturi.
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Air Filter/Dryer
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Venturi
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Load Hose Coupling
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Bead Muffler
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Question 34 of 45
34. Question
Arrange the steps below in the proper order for the BEAD LOADING PROCEDURE (steps 1-6)
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Remove camlock cap at lower load hose coupling; attach load hose.
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Stick end of bead load hose into beads. Keep hose end buried to maintain vacuum.
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Open the venturi air supply valve to allow compressed air to flow through the venturi and create a vacuum in the tank.
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Air compressor must be running to load beads. Verify air compressor switch is set to "Run" position.
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Vent tank pressure by opening venturi-to-tank valve. Verify tank pressure is relieved by inspection of tank pressure gauge.
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Close the bead tank outlet valve (pinch valve) and the tank air supply valve. Valve control panel is located on the edgeline side of the truck. Pull control knobs to close valves.
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Question 35 of 45
35. Question
Arrange the steps below in the proper order for the BEAD LOADING PROCEDURE (steps 7-12)
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Open 3" bead load valve to start bead flow into tank. Use the bead load hose to "vacuum" beads into the tank.
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Close venturi-to-tank valve.
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Close the 3" bead load valve.
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Open the tank supply air valve and the outlet (pinch) valve. Push the control knobs to open the valves.
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Allow beads to drain from 3" bead load valve area.
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Beads will stop flowing when the tank is full. Shut off venturi air supply valve.
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Question 36 of 45
36. Question
Match the term with its correct description below.
Sort elements
- Provides digital readout of material temperatures and set-points.
- Provides digital readout of the glycol system temperature and set-points.
- Provides power to operate solenoid valves located on the hydraulic pressure block inside the console. The hydraulic solenoid is energized when one of the CIRC/PAINT switches is in CIRC, or when in PAINT, SOLID, SKIP or START.
- Controls hydraulic pressure applied to material pump hydraulic cylinder.
- Indicates pressure applied to the material pump hydraulic cylinder.
- Indicates bead supply pressures and allows air pressure adjustment. Refer to tank-mounted gauge for actual pressure in tank.
- Switch controls purge air for cleaning gun tips.
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Material Temperature Controllers
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Glycol Temperature Controllers
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Hydraulic Control Switches
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Pressure Reducing Valves (PRV)
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Hydraulic Pressure Gauges
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Bead Tank Pressure
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Gun Purge Control
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Question 37 of 45
37. Question
Arrange the steps below in the proper order for the START UP PROCEDURE
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Engage PTO.
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Ensure the switches and valves located in console are in the following positions: ► Yellow and white pump switches are in the OFF position. ► Yellow and white hydraulic Pressure Reducing Valves (PRVs) are dialed down (fully counter-clockwise).
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Allow compressor engine to warm up for a couple minutes, then open air supply valves.
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Turn-on "Master" switch in chassis cab.
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Start compressor engine. Ensure that oil pressure gauge rises to operating range. Close air supply drain valve.
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Complete Daily Pre-Start Check List. Correct all deficiencies prior to start-up.
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Inspect both switch boxes and ensure switches are in the following positions: ► Two "START/STOP" switches are in the STOP position. ► All "PAINT/CIRC" switches are in the CIRC position. ► All "SOLID/OFF/SKIP" switches are in the OFF position.
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Question 38 of 45
38. Question
Arrange the steps below in the proper order for the START UP PROCEDURE (steps 8-14)
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Pressurize bead tanks to 40 psi. Bead tank pressure may have to be adjusted during striping to achieve proper bead application rate.
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Verify all material guns' safety mechanisms are locked down.
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Turn furnace switches on. Furnaces will ignite and their circulation pumps will start. Set glycol system controllers at 5° F warmer than the desired material temperature.
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Place hydraulic selector valve to OPERATE position. Observe that pump pressure gauge (located above the selector valve) rises from standby pressure of approximately 300 to 500 psi to operating pressure.
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Open all material line valves between material tanks and high-pressure pumps.
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Complete material and bead loading. Verify ball valves on the discharge side of the load pumps are closed.
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Once glycol temperature is at the desired temperature, material circulation and heat-up can begin.
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Question 39 of 45
39. Question
Arrange the steps below in the proper order for the START UP PROCEDURE (steps 15-21)
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Use the pressure-reducing valve to dial up pump hydraulic pressure to 200 to 800 lbs.
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Slowly dial up the hydraulic pressure until you reach the desired material pressure as indicated on the duplex gage.
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Continue circulation until the material reaches the desired temperature.
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Reset gun counters and set appropriate skip cycle in the timer control box.
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Unlock the safety mechanism on the gun(s) that will be used.
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Once desired material temperature is reached, set the auxiliary engine to high RPM with the switch in the console.
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Turn on high-pressure pump at the console.
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Question 40 of 45
40. Question
Arrange the steps below in the proper order for the START UP PROCEDURE (steps 22-28)
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Set the circ/paint switch for the gun(s) to paint.
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Turn gun control switch to the desired pattern (solid or skip).
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Adjust the line width by raising or lowering spray guns with the gun actuator switches in the operator's switch box.
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Set blow air (if needed) and bead switches to auto.
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Once the truck is at the desired speed for the proper mil application, turn the start/stop switch to start.
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Continuously monitor and adjust temperatures/pressures to achieve desired results.
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Position the truck and set the gun carriage on the ground.
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Question 41 of 45
41. Question
Arrange the steps below in the proper order for the SHUTDOWN PROCEDURE (steps 1-8)
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At switch box, turn PAINT/CIRC switch to CIRC. Pump will cycle until it bottoms at the lower proximity sensor, the pump switch light will go out. This feature prevents contamination and corrosion of exposed pump shafts.
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Ensure that material pressures drop to zero (O) psi.
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At switch box turn START/STOP switch to STOP.
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Lock down the spray guns and switch the gun to paint mode.
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At console, turn pump switch off.
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Dial down the pressure reducing valve, ensure that hydraulic pressure drops to zero (O) psi.
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Have an assistant spray the tip and needle with solvent while you turn the gun off and on with the momentary (push button) switch in the switch box.
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Turn off furnaces with switches in console. Furnaces have an automatic two-minute purge cycle after the switch is turned off.
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Question 42 of 45
42. Question
Arrange the steps below in the proper order for the SHUTDOWN PROCEDURE (steps 9-16)
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Bleed air pressure from the bead tanks by shutting the supply valves and slowly opening the dump valves.
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Secure carriages on their hangers and verify hose bundles have stowed properly.
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Turn off the compressor engine and slowly open the drain valve to drain water from the air system.
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Record footages and clear the footage counter.
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Remove spray tips and soak them in solvent.
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Turn the selector switch for the air compressor to start; allow the compressor to unload.
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Turn off Master Switch.
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Disenqaqe the PTO.
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Question 43 of 45
43. Question
Arrange the steps below in the proper order for the MATERIAL LOADING PROCEDURE (steps 1-6)
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Remove the load hose cap and place the end of the load in the barrel.
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Turn the appropriate load pump on with the switch in the load pump control panel.
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Close air supply valves to material tank.
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Remove hammer cap lid on, tank, level of tank must be visually monitored while loading material.
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Open the valve on the outlet side of the pump .
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"Master" switch must be on and the hydraulic power plant must be running with hydraulic by-pass in the "run" position.
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Question 44 of 45
44. Question
Arrange the steps below in the proper order for the MATERIAL LOADING PROCEDURE (steps 7-13)
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Turn the pump off and turn the flow control valve fully counter clockwise.
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Follow steps 2 thru 14 to load other material tanks. Clean and stow the load hoses.
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Clean the load hose with solvent;(do not get solvent on the inside of the load hose) install the cap on the end of the hose.
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Turn the load pump flow control valve clockwise to increase pump speed. Listen for cavitation or relief operation in pump (knocking or grinding), slow pump until noise stops. Warmer (low viscosity) material will allow faster pumping.
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When loading is complete, elevate the load hose to assist in draining the hose.
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Close the valve on the outlet side of the pump.
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Replace the material tank fill cap.
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Question 45 of 45
45. Question
Arrange the steps below in the proper order for the HANDGUN OPERATION PROCEDURE (steps 1-9)
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Attach the handgun air supply into one of the quick disconnects located at the rear of the truck.
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Open the two three-way valves at the pneumatic circulation control valves to allow material to circulate through the handgun. Note: The handgun shares the pneumatic circulation control valve with the ground gun.
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The system is now ready to apply material. Unlock the handgun and begin spraying material.
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The system is now ready to circulate material through the handgun. Circulating through the handgun is the same circulating through the ground gun.
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At the operator's switch box, set the "PAINT/CIRC" switch for the ground gun to CIRC.
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Turn the pump on and slowly increase pump hydraulic pressure with the pressure-reducing valve.
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Open valves that control flow to the handgun. Handgun valves are located near the high-pressure filters.
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At operator's switch box, turn on ground gun switch and turn off bead and blow air switches.
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Once you have reached spraying pressures, turn the "PAINT/CIRC" switch to PAINT.
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