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Skid Mounted Caustic Soda Equipment for Water Treatment – ZLN fully automatic control caustic soda dosing unit is a compact, pre-piped, and pre-wired solution developed for the water treatment industry. It is designed to store, transfer, and meter caustic soda (NaOH) solution for pH adjustment, alkalinity control, and neutralization in municipal and industrial water treatment processes. This equipment helps reduce installation cost, commissioning time, and daily operation workload for plant owners.
Tianjin ZhuoLiNeng Technology Co., Ltd supplies this unit as a manufactured product, not just a set of components. The skid includes tank, metering pumps, piping, valves, level sensors, and an automatic control panel. All major parts are mounted on a common base frame, so customers only need to connect utility lines and process pipes before operation.
Feature Highlights
Fully automatic PLC control – the system can run in automatic, manual, and remote modes, with adjustable dosing cycles and interlock logic.
Skid mounted structure – the entire unit occupies a small footprint, reducing civil work and on-site piping installation.
Corrosion-resistant construction – tank, pump, and wetted parts are selected to handle NaOH solution, making the equipment reliable for long-term operation.
Accurate dosing performance – the combination of calibrated metering pumps and flow control elements ensures stable chemical feeding.
Safe operation – low level switch, overload protection, emergency stop, and pressure relief functions are built into the design.
Easy maintenance – the compact layout provides convenient access to pumps, valves, and sensors for daily inspection and service.
Technical Parameters
| Item | Specification |
| System configuration | Skid mounted, pre-piped, pre-wired |
| Control mode | PLC based, fully automatic |
| Tank capacity | Customizable with level instruments |
| Dosing pump type | Diaphragm / piston metering pump (optional) |
| Dosing flow rate | Adjustable, based on process design |
| Power supply | AC 380V / 50Hz, other power options available upon request |
| Material option | Carbon steel lined / stainless steel wetted parts |
System Composition and Working Principle
The skid mounted caustic soda equipment mainly consists of a storage tank, agitator or mixing device, suction pipe, dose pump, injection unit, safety valve, level gauge, and control cabinet. When the water treatment process requires additional alkalinity, the PLC receives a signal from the pH meter or flow meter and starts the dosing pump for a set period. The caustic soda solution is delivered from the tank to the injection point at a controlled flow. The system also supports time-based dosing, remote start-stop, and proportional control when a signal is provided.
Safety and Operation Features
Low liquid level alarm with automatic pump stop protection.
Manual bypass mode for testing and maintenance.
Clear panel indicator lights and local display for status monitoring.
Prepared dry contacts for linking to plant SCADA or DCS system.
Smooth piping with proper slope to prevent caustic accumulation.
Customer Benefits
For a water treatment plant, installing a skid-mounted automatic caustic soda unit reduces site work and engineering risk. The factory-assembled structure means fewer piping joints, lower leakage possibility, and quicker start-up. Operators can manage chemical supply with less manpower, while the automatic control system maintains stable NaOH feeding around the clock. Because the equipment is designed for corrosive media, it also lowers long-term replacement cost. Whether the project is a new water treatment facility or an upgrade of an existing chemical feeding system, this equipment can be adapted to the required tank size, pump capacity, and control logic.
ZLN can provide optional solutions such as heated and insulated tanks for cold regions, double-walled piping, anti-crystallization heating traces, and remote monitoring modules. These options are configurable according to the customer’s actual site conditions. The equipment can also be supplied without the electrical cabinet for clients who prefer a separate control room. Please send your process data for a suitable engineering proposal.
Backed by a Certified Manufacturer
Tianjin ZhuoLiNeng Technology Co., Ltd operates with an quality management system to control the entire production process, including design, material selection, fabrication, assembly, testing, and packaging. The company has delivered equipment to markets in North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and many other regions. All shipments can be arranged from Tianjin Port with export packing suitable for sea freight. If you are planning a caustic soda dosing project, contact ZLN for reliable technical support and a customized solution.
Common Buyer Questions
Q1: Is the skid mounted caustic soda unit ready for outdoor installation?
The standard skid is designed for weather-resistant installation with protective coating on the base frame and control panel. For outdoor high-humidity areas, a shelter or additional protective cover can be supplied. Please confirm your site condition with ZLN when ordering.
Q2: What flow range can the fully automatic unit handle?
The unit can be configured with different metering pump sizes, from small dosing rates for process water systems to larger flows for municipal water treatment. The exact range is matched to your tank size and pH control requirement. Contact ZLN with your design parameters for pump selection.
Q3: How does the PLC control avoid dry running of the metering pump?
A low-level sensor in the tank sends a signal to the PLC. When the liquid level drops to the set point, the system stops the dosing pump and triggers an alarm signal to the operator. This prevents pump damage and ensures safe operation.
Q4: What wetted materials are recommended for caustic soda?
Common choices include carbon steel tanks with anti-corrosion lining, PP or PVC piping, and diaphragm metering pumps with suitable elastomer materials. Since NaOH concentration and operating temperature vary by project, ZLN selects compatible materials based on the supplied process conditions.
Q5: Can the automatic dosing system be connected to an existing water treatment control system?
Yes. The control cabinet normally includes digital inputs and dry contact outputs, and an optional analog signal interface (4–20 mA) can be added for remote monitoring or DCS integration. Please define your required signal types and communication protocol in the inquiry.
Q6: What maintenance does the caustic soda dosing system require?
Routine maintenance mainly includes checking pump oil or grease, inspecting valve seals, cleaning filter elements, and verifying sensor accuracy. The design provides accessible locations for service. A spare parts kit and operation manual are supplied with the equipment to support your routine care.
Q7: How is the equipment delivered and commissioned?
The unit is factory-tested, then disassembled only when necessary for transport. Standard export packing includes a steel frame and waterproof outer casing. On-site commissioning guidance and installation instructions are provided, while ZLN can also arrange technical personnel for overseas supervision if required.
Q8: Can the caustic soda equipment be customized for non-standard site conditions?
Yes. The tank capacity, pump flow rate, heating method, control cabinet enclosure degree, and piping layout can all be adjusted. ZLN provides a customized solution according to the client’s water treatment design and local environment requirements.
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