SCH8O/DIN UPVC/CPVC Meter Joint

How to correctly install UPVC/CPVC Meter Joint? Key steps and key points of leak prevention technology

UPVC (unplasticized polyvinyl chloride) and CPVC (chlorinated polyvinyl chloride) meter joints are widely used in various harsh environments. The quality of their installation directly affects the sealing, durability and safety of the system. The following are key installation steps and key points of leak prevention technology, and the precautions are explained in combination with application scenarios in different industries.

1. Key steps of installation
Material inspection and pretreatment
Inspect pipes and joints: Confirm that the UPVC/CPVC meter joint has no cracks or deformation, and check whether the specifications meet the design requirements (such as pressure level and temperature resistance range).

Clean contact surfaces: Use alcohol or special cleaning agents to remove oil and dust from the pipe ends and the inner wall of the joints to avoid failure of adhesive bonding (especially in the electronic semiconductor and pharmaceutical industries, it is necessary to ensure that there is no chemical residue).

Cutting and chamfering
Use special cutting tools to ensure that the pipe ends are flat and avoid uneven force caused by beveling.
Use a chamfer or sandpaper to grind the outer edge of the pipe end to prevent scratching the joint sealing surface (photovoltaic and nuclear power plant systems have extremely high requirements for sealing).

Adhesive bonding (applicable to UPVC/CPVC solvent welding)
Choose special adhesive: UPVC and CPVC need to use corresponding glue (cannot be mixed), CPVC adhesive has higher temperature resistance (applicable to high-temperature circulating water systems in the metallurgical industry).
Uniform glue application: Quickly apply glue to the pipe end and the inner wall of the joint, rotate 1/4 turn after insertion to evenly distribute the glue, and let it stand to cure (curing time is adjusted according to ambient temperature).

Mechanical connection (such as threaded or flanged)
Sealing tape/gasket selection: UPVC threaded joints are recommended to use PTFE raw tape; CPVC flange connections require corrosion-resistant gaskets (acid and alkali resistant materials are required in industrial wastewater treatment).

Torque control: Avoid cracking of pipes due to over-tightening (drinking water systems must meet hygiene standards, and heavy metal sealing materials are prohibited).

Pressure test and leak detection
Perform water pressure/air tightness test within 24 hours after installation, slowly pressurize to 1.5 times the working pressure, and maintain pressure for 30 minutes without leakage (nuclear power plants and the pharmaceutical industry require additional helium detection and other precision leak detection).

2. Key points of leak prevention technology
Temperature and medium adaptability
CPVC is more resistant to high temperatures (up to 90°C or above), suitable for photovoltaic cooling systems or high-temperature wastewater in the metallurgical industry; UPVC is suitable for drinking water and industrial water treatment (normal temperature environment).
For strong acid/alkali media (such as electronic semiconductor plant wastewater), the chemical resistance of the material needs to be confirmed, and an anti-corrosion lining should be installed if necessary.

Dynamic load protection
In a vibrating environment (such as nuclear power plant auxiliary pipelines or pharmaceutical plant pump rooms), flexible joints or bracket buffers need to be installed.

Special industry requirements
Drinking water system (Safe Drinking Water): It must comply with NSF/ANSI 61 certification to avoid adhesive contamination of water quality.
Electronic semiconductor: Ultra-high purity water system requires the inner wall of the joint to be smooth and free of precipitates.

Industrial wastewater treatment: Chlorine or organic solvent wastewater needs to use CPVC materials that are resistant to UV and chemical corrosion.

3. Notes on industry applications
Photovoltaic/nuclear power plants: Focus on weather resistance and long-term stability. UV aging needs to be checked regularly after installation.
Medicine/semiconductors: The installation environment needs to be dust-free. The volatiles of the adhesive may affect the cleanliness. It is recommended to disinfect after pre-assembly.
Metallurgy/industrial wastewater: In high temperature or corrosive media environments, it is recommended to use CPVC+flange connection for easy maintenance.