Epoxy: Impingement

MRL striping trucks are equipped with two emergency stop buttons; one in the cab and one on the rear operator’s console.  

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.

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.

Hydraulically driven rotary pumps and load hoses are used to transfer catalyst and resin from totes to material storage tanks on the truck. 

Three separate diesel fired heaters and circulation pumps are used to heat the catalyst and resin to proper temperature for effective impingement mixing.

The recirculation system allows continuous flow of material from the high-pressure pumps back to material tanks when not applying material to the road.

Recirculation helps to reduce warm-up time and keeps the system at a constant temperature when spraying is temporarily interrupted.

Restrictor valves contain orifices that are sized to create the same pressure drop as spraying material through the guns.

Avoid recirculating material at high pressure for long periods of time. Excessive recirculating will cause premature pump wear.

Significant increase in resin or catalyst material pressure while recirculating indicates a plugged orifice.

Sort the following steps in the correct sequence for clearing a clogged orifice.  

Hydraulically driven, positive displacement piston pumps provide the pressure and proper mix ratios for plural component striping materials.

MRL recommends material pressures of at least 2500 psi for proper impingement mixing of catalyst and resin.

At SMC, when resin pump maintenance is required, both pumps need to be rebuilt.

The catalyst pump does not require maintenance as often due to the lack of abrasive compounds in the material.

The high-pressure heat exchangers provide the operator with the capability to adjust material temperature and viscosities for optimum material mixing.

Material hoses are rated for 3,500 psi working pressure and 12,000 psi burst pressure.

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.

The truck ignition switch must be on for the Warning lights and Video systems to be operational.

The timing system turns on solenoids for material guns, bead guns, blow airs, carriage lifts and some relays as applicable.

The operator’s switch boxes provide the operator with a series of switches to control the spray guns and bead guns.

From the options below, match the function with its description.  

Console switchbox controls functions for:
a. Skip length, cycle length and skip bead application.
b. Footage displays and calibration parameters.
c. Counter reset options.

Match each of the four switches (left and right) with its correct description below.  

Match the term with its correct description below.

To get bead coverage on the end of solid lines set the bead gun to TEST until after the spray gun is shut off.

Match the term with its correct description below.

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

Match the term with its correct description below.

Match the term with its correct description below.