pH Control Purpose

Water pH affects corrosion, scaling, chemical treatment effectiveness, and regulatory compliance. Boiler feedwater requires alkaline pH preventing corrosion. Wastewater discharge needs neutral pH meeting permits. pH correction maintains optimal conditions.

Skid Components

Acid and caustic storage tanks with level monitoring, dual metering pumps for redundancy, inline pH analyzer with flow cell, static mixer ensuring chemical dispersion, sample panel, control system adjusting chemical feed, alarm outputs. Complete integrated package.

Chemical Selection

Sulfuric acid or hydrochloric acid for pH reduction. Sodium hydroxide (caustic) or soda ash for pH increase. Selection depends on water chemistry, target pH, and compatibility with downstream processes.

Dosing Control

pH transmitter provides continuous measurement. PID controller modulates pump speed or stroke maintaining setpoint typically ±0.2 pH units. Feedforward from flow measurement compensates for throughput variations improving control.

Pump Technology

Diaphragm metering pumps provide accurate chemical dosing with isolation. Adjustable stroke or variable speed enables precise control. Materials compatible with concentrated acids and caustics. Dual pumps provide redundancy during maintenance.

Operating Pressure

Pump discharge pressure overcomes injection point pressure plus piping losses typically 50-150 psig. Positive displacement maintains accuracy across pressure variations. Pulsation dampeners protect instrumentation.

Material Construction

Chemical-resistant polyethylene or fiberglass tanks. Stainless steel or PVC piping. Pump wetted parts compatible with chemicals. Injection points in corrosion-resistant materials. Containment for chemical spills.

Monitoring Systems

Continuous pH measurement with automatic calibration reminders. High and low pH alarms warn of control issues. Chemical tank level switches prevent empty tank operation. Data logging tracks performance.

Applications

Boiler feedwater pH adjustment, cooling tower pH control, reverse osmosis feed conditioning, wastewater neutralization, process water pH management, pharmaceutical water systems.

Safety Features

Chemical containment sumps capture spills. Ventilation for chemical vapors. Emergency shutdown capability. Proper labeling and material identification. Installation per chemical handling codes.

Mixing Requirements

Static mixer ensures complete chemical dispersion before pH measurement. Inadequate mixing causes false readings and poor control. Mixer design based on flow rate and chemical dosing.

System Integration

Interfaces with plant control systems providing pH data and receiving setpoint commands. Remote monitoring enables centralized water treatment management. Automated operation minimizes labor.

Performance Benefits

Maintains precise pH control protecting equipment and meeting regulations. Automated operation ensures consistency. Reduces chemical waste through accurate dosing. Proven pH control technology.

Construction Standards

Pressure equipment per applicable codes. Chemical compatibility verified. Electrical systems for hazardous areas if required. Complete documentation with control logic and safety information.

ERGIL pH correction and dosing skids provide reliable automated water chemistry control maintaining target pH in industrial water treatment applications.