> ## Documentation Index
> Fetch the complete documentation index at: https://docs.supplyline.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Troubleshooting

> Problem diagnosis and corrective actions for MTC DICE dosing modules

# Troubleshooting

<sub>Source: [DICE IOM Manual V12E](https://supplyline.com/assets/MTC-IOM_DICE-DS-DM-Operating-Manual-V12E.pdf), Page: 39</sub>

<Warning>
  Before any repair work, depressurize the system, release regulating valves, and flush all fluids. Wear appropriate PPE.
</Warning>

## Module Issues

<AccordionGroup>
  <Accordion title="Leaking from connector">
    | Possible Cause                                       | Action                                   |
    | ---------------------------------------------------- | ---------------------------------------- |
    | Insufficient pressure on connector from mushroom nut | Hand-tighten the mushroom nut (no tools) |
    | O-ring failure                                       | Replace the O-ring (30)                  |
  </Accordion>
</AccordionGroup>

## Ball Valve Issues

<AccordionGroup>
  <Accordion title="Leaking fluid from connector area">
    | Possible Cause         | Action                     |
    | ---------------------- | -------------------------- |
    | Carrier O-ring failure | Replace carrier O-ring (7) |
  </Accordion>

  <Accordion title="Ball valve leaks in closed position">
    Fluid passes through the valve when handle is in closed position.

    | Possible Cause       | Action                                                                     |
    | -------------------- | -------------------------------------------------------------------------- |
    | Worn ball            | Replace ball (4)                                                           |
    | Worn ball valve seat | Replace both seats (6) and seat O-rings (8)                                |
    | Loose carrier        | Adjust carrier position per [Maintenance](/docs/mtc/dice/maintenance) procedure |
  </Accordion>

  <Accordion title="Valve difficult to operate">
    Ball valve does not fully open/close, or requires excessive torque.

    | Possible Cause                            | Action                                                                     |
    | ----------------------------------------- | -------------------------------------------------------------------------- |
    | Excessive pressure between ball and seats | Adjust carrier position per [Maintenance](/docs/mtc/dice/maintenance) procedure |
    | Excessive torque on stem nut              | Loosen stem nut and retighten to 30 in-lb                                  |
  </Accordion>

  <Accordion title="Handle does not operate valve">
    | Possible Cause              | Action                           |
    | --------------------------- | -------------------------------- |
    | Broken stem                 | Replace stem (3)                 |
    | Broken stem/handle coupling | Replace stem (3) and handle (11) |
    | Broken stem/ball coupling   | Replace stem (3) and ball (4)    |
  </Accordion>

  <Accordion title="Leakage near ball valve handle">
    | Possible Cause          | Action                       |
    | ----------------------- | ---------------------------- |
    | Stem O-ring failure     | Replace stem O-ring (9)      |
    | Stem nut O-ring failure | Replace stem nut O-ring (10) |
  </Accordion>
</AccordionGroup>

## Back Pressure and Pressure Relief Valve Issues

<AccordionGroup>
  <Accordion title="Leaking from adjustment screw">
    | Possible Cause     | Action                 |
    | ------------------ | ---------------------- |
    | Ruptured diaphragm | Replace diaphragm (16) |
  </Accordion>

  <Accordion title="Leaking from valve/block interface">
    | Possible Cause                                    | Action                                                    |
    | ------------------------------------------------- | --------------------------------------------------------- |
    | Ruptured diaphragm                                | Replace diaphragm (16)                                    |
    | Insufficient pressure between diaphragm and block | Tighten 4 mounting bolts (18) to 35 in-lb in star pattern |
  </Accordion>

  <Accordion title="Adjustment screw does not affect pressure">
    | Possible Cause | Action              |
    | -------------- | ------------------- |
    | Spring failure | Replace spring (17) |
  </Accordion>
</AccordionGroup>

## Pressure Indicator Issues

<AccordionGroup>
  <Accordion title="Leaking from pressure gauge NPT connection">
    | Possible Cause                      | Action                                                  |
    | ----------------------------------- | ------------------------------------------------------- |
    | Loose NPT connection                | Tighten pressure gauge NPT connection on isolator       |
    | Ruptured isolator diaphragm         | Ship isolator and gauge assembly to supplier for repair |
    | Chemical attack on gauge connection | Ship isolator and gauge assembly to supplier for repair |
  </Accordion>

  <Accordion title="Leaking from bleeding screw">
    | Possible Cause                | Action                                                  |
    | ----------------------------- | ------------------------------------------------------- |
    | Bleeding screw O-ring failure | Replace O-ring                                          |
    | Ruptured isolator diaphragm   | Ship isolator and gauge assembly to supplier for repair |
  </Accordion>

  <Accordion title="Pressure reading incorrect">
    | Symptom          | Possible Cause                    | Action                                                  |
    | ---------------- | --------------------------------- | ------------------------------------------------------- |
    | Reading too high | Blocked injection path            | Check for closed valves or blockage downstream          |
    | Reading too low  | Pressure relief valve set too low | Readjust PRV per [Startup](/docs/mtc/dice/startup) procedure |
    | Reading zero     | System not pressurized            | Verify pump is running and primed                       |
    | Erratic reading  | Air in system                     | Use bleed valve to purge air                            |
  </Accordion>
</AccordionGroup>

## System Issues

<AccordionGroup>
  <Accordion title="Pump will not prime">
    | Possible Cause              | Action                                                             |
    | --------------------------- | ------------------------------------------------------------------ |
    | Trapped air in system       | Slightly open bleed valve (32) while pump cycles until fluid flows |
    | Check valve failure in pump | Inspect and replace pump check valves                              |
    | Suction line air leak       | Check suction line connections                                     |
  </Accordion>

  <Accordion title="No flow to process">
    | Possible Cause             | Action                                           |
    | -------------------------- | ------------------------------------------------ |
    | Injection valve closed     | Open injection valve (1)                         |
    | Back pressure set too high | Readjust BPV to 20-30 psi above process pressure |
    | Pump not running           | Verify pump power and operation                  |
    | Blocked injection line     | Clear downstream blockage                        |
  </Accordion>

  <Accordion title="Chemical returns to tank">
    | Possible Cause                         | Action                            |
    | -------------------------------------- | --------------------------------- |
    | Pressure relief valve set too low      | Increase PRV set point            |
    | Back pressure too high relative to PRV | Verify PRV is set higher than BPV |
    | BPV diaphragm failure                  | Replace BPV diaphragm (16)        |
  </Accordion>

  <Accordion title="Calibration column does not fill">
    | Possible Cause                    | Action                                       |
    | --------------------------------- | -------------------------------------------- |
    | Calibration column valve closed   | Open calibration column valve (2)            |
    | Injection valve open              | Close injection valve (1) during calibration |
    | Separation valve closed (DM only) | Open separation valve (4) during calibration |
  </Accordion>

  <Accordion title="Calibration column does not drain">
    | Possible Cause                | Action                                       |
    | ----------------------------- | -------------------------------------------- |
    | Evacuation valve closed       | Open evacuation valve (3)                    |
    | Calibration column not vented | Vent top of calibration column to atmosphere |
    | Blockage in evacuation line   | Clear evacuation line                        |
  </Accordion>
</AccordionGroup>

## Quick Reference

<Accordion title="Common replacement parts">
  | Component               | Part Numbers                        |
  | ----------------------- | ----------------------------------- |
  | Ball (4)                | Contact supplier with serial number |
  | Seats (6)               | Contact supplier with serial number |
  | O-ring — Carrier (7)    | Contact supplier with serial number |
  | O-ring — Seat (8)       | Contact supplier with serial number |
  | O-ring — Stem (9)       | Contact supplier with serial number |
  | O-ring — Stem nut (10)  | Contact supplier with serial number |
  | Diaphragm (16)          | Contact supplier with serial number |
  | Spring (17)             | Contact supplier with serial number |
  | O-ring — Connector (30) | Contact supplier with serial number |
</Accordion>

<Note>
  When ordering parts, provide the module serial number engraved on the block.
</Note>

***

## Related Products

<CardGroup cols={2}>
  <Card title="DICE DS — Suction Lift" icon="cube" href="https://supplyline.com/product/mtc/dice/ds">
    1/2" module for suction lift applications
  </Card>

  <Card title="DICE DM — Flooded Suction" icon="cube" href="https://supplyline.com/product/mtc/dice/dm">
    1/2" and 1" modules for flooded suction
  </Card>
</CardGroup>

## Sources

<Card title="DICE IOM Manual V12E" icon="file-pdf" href="https://supplyline.com/assets/MTC-IOM_DICE-DS-DM-Operating-Manual-V12E.pdf" horizontal>
  Page 39 • July 2022
</Card>