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Operation

Source: DICE IOM Manual V12E, Pages: 24–30 Use this section to confirm valve positions, operating modes, and safe depressurization steps.

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Normal Operation

During normal injection operation:
DICE module showing injection valve open, all others closed

DICE valve positions for normal operation

During normal operation, the pressure indicator should display the back pressure valve set point. If the reading differs significantly, refer to Troubleshooting.

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Operating Modes

Chemical flows from the tank through the pump, into the DICE module, through the back pressure valve, and out the injection port to the process.

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Ball Valve Guidelines

Ball valves are designed for on/off service only. Never leave valves partially open for extended periods.
Ball valve with prohibition symbol indicating no partial opening

Partial opening is prohibited

  • Partial opening causes uneven wear on PTFE valve seats
  • Damaged seats lead to leakage in the closed position
  • Throttling reduces valve service life
Best practices:
  • Always move valves to fully open or fully closed
  • If a valve feels stiff, operate it several times to reseat
  • Never force a valve—if excessive torque is required, refer to Troubleshooting

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Lockout Procedures

DICE modules can be ordered with optional lockout handles, or lockout kits can be purchased separately.
DICE module showing lockout handles with wire threaded through

DICE with lockout handles installed

1

Position valves

Set each ball valve to the required locked position (open or closed).
2

Engage locking device

Ensure the locking ball device seats in the spherical groove on the block.
3

Thread lockout wire

Insert the provided lockout wire through each handle.
4

Verify all valves

Confirm each ball valve is locked and cannot be operated.

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Depressurizing the DICE Module

Before any maintenance, fully depressurize the module.
1

Close isolation valves

Close the injection ball valve (1) and calibration column ball valve (2).
2

Open evacuation

Open the evacuation ball valve (3) to vent downstream pressure.
DICE top view showing valves 1, 2, 3

Valve positions for depressurizing

  • This procedure depressurizes only the DICE internal cavities
  • Chemical pressure may still exist downstream of closed ball valves (e.g., process pressure downstream of closed injection valve)
  • Release all downstream pressure before disconnecting piping
  • For flooded suction applications, drain the pump suction line before depressurizing the DICE module
The depressurizing procedure is informative and does not limit operator responsibility to verify absence of pressure before maintenance. Always confirm zero pressure before opening any connections.

DICE DS — Suction Lift

1/2” module for suction lift applications

DICE DM — Flooded Suction

1/2” and 1” modules for flooded suction

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Sources

DICE IOM Manual V12E

Pages 24–30 • July 2022