Methods and systems to control percent solids in conveyance pipe

A method of conveying a slurry including a solid and a liquid to a placement site through a conveyance line, the method comprising:

• mixing the solid and the liquid in a mixing tub to form the slurry;
• pumping the slurry within a conveyance line with a pump to convey the slurry a distance to the placement site;
• setting, using a control system, a minimum flow rate in the conveyance line to maintain a critical velocity of the slurry based on a characteristic of the slurry;
• and
• adjusting, using the control system, a percent of solids of the slurry within the mixing tub based on at least one of a target pump rate or the distance to the placement site to maintain the minimum flow rate.

A system for conveying a solid and liquid slurry to a placement site through a conveyance line, the system comprising:

• a pump operable to pump the slurry through the conveyance line a distance to the placement site, wherein the slurry is combinable with the conveyance line downstream of the pump;
• a mixing tub configured to mix the solid and liquid slurry;
• a flow sensor operable to measure a flow rate of the slurry in the conveyance line;
• and
• a control system operable to set a minimum flow rate in the conveyance line to maintain a critical velocity of the slurry based on a characteristic of the slurry and adjust a percent of solids of the slurry within the mixing tub based on at least one of a target pump rate, the distance to the placement site, or the flow sensor to maintain the minimum flow rate.