Systems and methods for acid mixing

A system for mixing acid from a tank with water, comprising:

• a skid;
• a water inlet line, wherein the water inlet line includes a first water inlet coupling configured to receive water from a first side of the skid and a second water inlet coupling configured to receive water from a second side of the skid, and wherein the first side is different from the second side;
• a water pump mounted to the skid for pumping water from the water inlet line;
• a water flow meter mounted to the skid downstream of the water pump;
• a water control valve mounted to the skid downstream of the water pump;
• an acid pump mounted to the skid for pumping acid out of the tank;
• an acid flow meter mounted to the skid downstream of the acid pump;
• an acid control valve mounted to the skid downstream of the acid pump;
• an electronically controlled flush valve mounted to the skid and configured to selectively permit water to flow from downstream of the water pump to upstream of the acid pump;
• and
• a controller mounted to the skid and configured to monitor the flow meters and control the pumps and the valves.

A system for mixing acid from a tank with water, comprising:

• a water pump control output configured to control a first speed of a water pump;
• a water flow meter configured to monitor a water flow rate of the water through the water pump;
• a water control valve configured to control the water flow rate;
• an acid pump control output configured to control a second speed of an acid pump;
• an acid flow meter configured to monitor an acid flow rate of the acid from the tank through the acid pump;
• an acid control valve configured to control the acid flow rate;
• an acid inlet valve configured to selectively permit acid to flow from the tank;
• a temperature sensor configured to monitor a temperature of the acid;
• a flush valve configured to selectively permit water to flow from downstream of the water pump to upstream of the acid pump;
• an input device configured to receive an acid specific gravity, an acid concentration, a mixture volume, and a flush volume;
• and
• a controller configured to calculate an acid to water ratio to achieve the acid concentration using the acid specific gravity and the temperature of the acid;
• control both pumps to maintain an output pressure;
• control the water control valve and the acid control valve to maintain the acid concentration, until the mixture volume is reached, and
• control the acid inlet valve and the flush valve to automatically stop acid flow from the tank and flush the acid flow meter, the acid control valve, and the acid pump with water, after the mixture volume is reached.