LBTG-63V Thermoplastic Pipe System Hot and Cold Water Circulation Test Machine
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Description
Product Introduction:
The LBTG series hot‑and‑cold water circulation testing machine is designed for evaluating pipeline systems assembled from various plastic pipes and fittings in accordance with standard requirements. The system is subjected to a specified internal pressure, with alternating cycles of cold and hot temperatures over a prescribed duration. After completing the required number of test cycles, the integrity of the pipes and fittings is inspected for leaks or fractures. This test is a long‑term stability assessment: each set of plastic pipe samples undergoes 5,000 cold‑hot water circulation cycles, with each cycle lasting 30 minutes—15 minutes of cold water followed by 15 minutes of hot water. Consequently, the equipment must ensure reliable, long‑term operation and consistent performance. The instrument comprises several key components, including a cold‑water exchange module, a hot‑water exchange module, a transparent sample chamber, an electrical control cabinet, a circulation system, and an industrial chiller. It features an aesthetically pleasing design, a modular architecture, stable performance, dependable quality, and user‑friendly operation.
Product Features:
Open‑system design: High‑temperature, high‑pressure water is confined solely to the sample and its associated piping; the equipment features a atmospheric‑pressure vessel, while all other circulation lines operate at ambient pressure. Valves, sensors, and other components function under atmospheric conditions, ensuring the instrument’s long‑term reliability.
Fully closed-loop control: The instrument employs an imported all-digital control system to implement closed-loop regulation of the internal pressure in the test pipeline. During operation, the control system automatically adjusts the main circulation pump and control valves based on parameters such as fluid temperature, operating time, and pipeline flow rate, ensuring that the internal pressure of the test pipeline remains constant. Even during alternating cycles of cold and hot water, no water hammer occurs, exceeding the requirements of national standards.
Intelligent switching: The control system automatically adjusts based on the inlet and outlet water temperatures of the sample loop, the liquid levels in the cold and hot water tanks, and the cold–hot switching time settings. It intelligently opens the return valves of the cold and hot water tanks, ensuring that most of the cold water returns to the cold water tank during switching. During this process, the temperature variation between the cold and hot water tanks remains below 3°C, resulting in low energy consumption for system testing. Low-noise operation: A flow‑control device independently designed by our company is installed in the test loop, significantly reducing noise caused by high‑velocity water flow scouring the piping.
Ambient noise; refrigeration system: an imported industrial chiller is used as the low-temperature cooling source,
Water-to-water cooling enhances refrigeration efficiency, ensuring the compressor operates continuously at its optimal performance level, thereby improving cooling efficiency and significantly extending the service life of industrial chillers.
Multi-layered security protection:
Liquid-level protection: Both the cold‑water and hot‑water tanks are equipped with multiple liquid‑level safeguards; if the water level drops below a set threshold, the system automatically shuts down (or initiates补水) to prevent damage to the circulation pump caused by dry running. Transparent protective enclosure: The laboratory’s transparent design provides effective protection for test personnel while allowing convenient observation of the test specimens. Electromagnetic lock protection: When the main door of the specimen chamber is not fully closed, the instrument triggers an automatic alarm. During operation, the specimen chamber door locks automatically, preventing access by operators. Comprehensive alert functions: If the cold‑water or hot‑water tank is low on water, if a specimen breaks, or if the specimen chamber door remains open, the system will automatically prohibit start-up of the circulation cycle and display a flashing warning in the screen’s title bar to indicate an abnormal condition.
Unique flow‑control capability: Within the test loop, the switching time between cold‑water circulation and hot‑water circulation—whether from cold to hot or from hot to cold—is less than 1 minute. During this period, the temperature difference between the sample inlet and outlet is maintained within 2°C, and pressure fluctuations remain below ±0.02 MPa, significantly exceeding the requirements of national standards.
Flow Display: Imported flow sensor, providing real-time display of pipeline flow data. (Optional)
Pre-tensioning device: Features an independent rigid load-bearing support frame and employs a lever‑type pre‑stress loading mechanism, with real‑time display of the applied force. (Optional)
Maintenance-free control valve: features a diaphragm-less valve body design, with the valve body sealing material made of high‑temperature‑resistant PPL. During instrument operation, there is no need to replace the valve body sealing material, ensuring maintenance‑free operation and high instrument reliability.
Intelligent Watering: The intelligent watering function reduces the workload of laboratory personnel and prevents manual water addition from affecting the test water temperature, thereby avoiding temperature fluctuations that could disrupt normal experimental operation.
Good human-computer interaction:
1. Featuring a full-color touchscreen display, the control system integrates the regulation of pressure, flow rate, temperature, and time, as well as sampling functions. During testing, the system automatically generates pressure–time and flow–time curves (flow sensor required as an optional accessory), along with sample inlet temperature–time and outlet temperature–time curves. Test data is automatically saved to a USB flash drive and can be opened, viewed, and printed using Windows Notepad.
2. Every 10 seconds, real-time measurements are collected for test pressure, inlet and outlet temperatures, and flow rate, ensuring that at least six data points are captured during the switching process to facilitate subsequent analysis of the experimental data.
3. The upper and lower limits for pressure and temperature alarms can be set, and the test can be automatically stopped when either the temperature or pressure exceeds these set thresholds.
4. Automatically detects faults and provides prompt messages; during operation, the system automatically identifies the location of any abnormality and issues corresponding alerts, enabling even untrained users to perform maintenance independently.
High Reliability: The instrument is designed with an industrial-grade programmable control system, and all control components are engineered for industrial‑environment applications, ensuring system safety and reliability.
Reference standard:
| Standard number | Standard Name |
| ISO 10508:2006 | Plastics piping systems for hot and cold water installations — Guidance for classification and design |
| EN 12293 | Plastics piping systems—Thermoplastics pipes and fittings for hot and cold water—Test method for the resistance of mounted assemblies to temperature cycling |
| EN ISO 19893-2018 | Plastics piping systems – Thermoplastics pipes and fittings for hot and cold water – Test method for the resistance of mounted assemblies to temperature cycling |
| ISO 15874 | Plastics piping systems for hot and cold water installations–Polypropylene(PP) |
| ISO 15874, ISO 15875, ISO 15876, ISO 15877, BS7291 | (No corresponding standard name) |
| GB/T 19993-2005 | Test method for thermal cycling of thermoplastic piping systems for hot and cold water—pipe and fitting assemblies |
| GB/T 18997.1-2003 | Aluminum-Plastic Composite Pressure Pipe — Part 1: Aluminum‑Lined, Lap‑Welded Aluminum‑Plastic Pipe |
| GB/T 18997.2-2003 | Aluminum-Plastic Composite Pressure Pipe – Part 2: Aluminum-Plastic Pipe with Butt-Welded Aluminum Tube |
| GB/T 18742.2-2002 | Polypropylene piping systems for hot and cold water — Part 2: Pipes |
| GB/T 18742.3-2002 | Polypropylene Pipe Systems for Hot and Cold Water — Part 3: Fittings |
| GB/T 18992.2-2003 | Cross-Linked Polyethylene (PE-X) Piping Systems for Hot and Cold Water — Part 2: Pipes |
| GB/T 18993.2-2003 | Chlorinated Polyvinyl Chloride (PVC-C) Piping Systems for Hot and Cold Water — Part 2: Pipes |
| GB/T 18993.3-2003 | Chlorinated Polyvinyl Chloride (PVC-C) Piping Systems for Hot and Cold Water — Part 3: Fittings |
| GB/T 18991-2003 | Thermoplastic pipes and fittings for hot and cold water systems |
Technical Specifications:
| Project | Indicator | |
| Pressure | Control range | 0.40 MPa to 1.20 MPa, arbitrarily set |
| Control accuracy | Setpoint ±0.02 MPa (including the hot–cold switching process) | |
| Test station | Channel 1–6 | |
| Maximum total measured pipe diameter | (2×Φ63) (customizable) (4×Φ40 and below) (customizable upon request) |
|
| Circulation time for hot and cold water, respectively | Set arbitrarily between the 600s and the 1800s. | |
| Alternating hot and cold water time | ≤60s | |
| Number of iterations | Arbitrarily set from 0 to 100,000 times | |
| Maximum straight-run pipe length of the specimen | 3700mm | |
| Display mode | Touchscreen display | |
| Control method | PLC control | |
| Flow rate | >0.9 m/s | |
| Water source | Water quality | Pure water, deionized water, or softened water |
| Automatic water replenishment pressure | >0.05 MPa | |
| Indication error of temperature display | ±0.2℃ | |
| Temperature difference between the sample inlet and outlet | <2℃ | |
| Cold water tank | Temperature control range | 20°C to room temperature (room temperature > 20°C) |
| Temperature control accuracy | Setpoint ±0.5℃ | |
| Temperature uniformity | ±0.5℃ | |
| Hot water tank | Temperature control range | Room temperature to 95°C |
| Temperature control accuracy | Setpoint ±0.5℃ | |
| Temperature uniformity | ±0.5℃ | |
| Power supply | 380 (1–15%) VAC to 380 (1+10%) VAC, 50 Hz, 25 kW | |
| External dimensions | 5200 mm (length) × 3200 mm (width) × 2100 mm (height) | |
| Installation dimensions | 6000 mm (length) × 4000 mm (width) × 3000 mm (height) | |
| Total weight | 3210kg | |
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