When a large change in production rate is initiated, and the DPA press is having to
respond, the following are of general concern:
• Check which controllers are in manual position, which controllers are in
automatic position, and which controllers are monitoring other controllers or
analyzers i.e. set in cascade position.
• Monitor the roll speed and torque when major reductions in pulp production
rate occur. If the torque is in auto, do not let the roll speed drop below about
3.5-4 rpm as there is an increased tendency to plug the vat below this speed. At
very low production rates, it is better to allow lower discharge consistency
while keeping the roll speed at this lower stable operating limit.
• Keep the flow and consistency to the press within the stable operating ranges.
Too low a flow will encourage stagnant pulp in the headbox and vat. Too low
a feed consistency will encourage excess fiber content in the filtrate, with the
potential of plugging showers or settling in the filtrate tanks.
When a large change in production rate is initiated, and the DPA press is having torespond, the following are of general concern:• Check which controllers are in manual position, which controllers are inautomatic position, and which controllers are monitoring other controllers oranalyzers i.e. set in cascade position.• Monitor the roll speed and torque when major reductions in pulp productionrate occur. If the torque is in auto, do not let the roll speed drop below about3.5-4 rpm as there is an increased tendency to plug the vat below this speed. Atvery low production rates, it is better to allow lower discharge consistencywhile keeping the roll speed at this lower stable operating limit.• Keep the flow and consistency to the press within the stable operating ranges.Too low a flow will encourage stagnant pulp in the headbox and vat. Too lowa feed consistency will encourage excess fiber content in the filtrate, with thepotential of plugging showers or settling in the filtrate tanks.
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