Description
End Cap 75mm
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What is End Cap 75mm DADEX PPRc ?
The End Cap 75mm DADEX PPRc PN 25 is a specialized pipe fitting manufactured by DADEX under their Polydex brand. It is designed to securely seal the open end of a 75mm diameter PPR (Polypropylene Random Copolymer) pipe, preventing fluid leakage and allowing for system isolation or future expansions. This fitting is commonly used in plumbing and piping systems for hot and cold water supply, as well as HVAC applications. Made from high-quality PPRc material, it offers excellent durability, chemical resistance, and thermal stability, making it suitable for both residential and commercial installations. The “PN 25” designation indicates its nominal pressure rating, ensuring it can handle high-pressure environments, particularly in systems involving elevated temperatures.
Specifications
The following table summarizes the key specifications for the End Cap 75mm DADEX PPRc PN 25, based on standard PPRc fitting guidelines and DADEX Polydex product details. Note that exact dimensions may vary slightly by manufacturer batch, but these align with DIN standards.
| Parameter | Details |
|---|---|
| Material | Polypropylene Random Copolymer (PPRc) |
| Size (Nominal Diameter) | 75 mm (compatible with 75 mm OD pipes) |
| Pressure Rating | PN 25 (25 bar at 20°C; derates at higher temperatures, e.g., ~10 bar at 70°C) |
| Wall Thickness (approx.) | 12.5–12.65 mm (for fitting connection) |
| Outer Diameter (Cap Body) | ~100 mm (approximate, including socket) |
| Length (Overall) | ~56–60 mm |
| Standards Compliance | DIN 16962 (fittings); compatible with DIN 8077/8078 (pipes) |
| Temperature Range | -10°C to 95°C (short-term up to 110°C) |
| Color | Typically green (as per DADEX Polydex) |
| Weight (approx.) | 150–200 g |
| Joint Type | Socket fusion (heat-welded) |
These specs ensure the fitting is robust for demanding applications, with a service life of up to 50 years under normal operating conditions.
Applications
This end cap is versatile and ideal for:
- Hot and Cold Water Supply: In residential, commercial, hospital, hotel, and school buildings for potable water distribution, boiler connections, and rainwater systems.
- HVAC Systems: Central air-conditioning, chilled water lines, and heating systems due to its low thermal conductivity and resistance to temperature fluctuations.
- Other Uses: Compressed air distribution, swimming pools, agricultural irrigation, and transport of mildly aggressive fluids (e.g., acids or alkalis).
It is not recommended for high-aggression chemicals or extreme industrial gases without compatibility checks.
Advantages
- Durability and Longevity: Resistant to corrosion, abrasion, frost, and scaling; maintains integrity in seismic areas.
- Hygienic and Safe: Potable (non-toxic), prevents bacterial growth (antimicrobial variants available), and ensures clean water flow.
- Efficiency: Low heat and electrical conductivity reduces energy loss; noise-free operation.
- Ease of Use: Lightweight, versatile, and quick to install via fusion welding.
- Environmental Benefits: Recyclable, energy-saving, and eco-friendly.
Installation
Installation of the DADEX PPRc End Cap involves socket fusion welding (also called heat fusion or polyfusion), a reliable method that creates a seamless, leak-proof joint. Follow these steps for proper installation:
- Preparation:
- Cut the 75mm PPR pipe to the required length using a pipe cutter for a clean, perpendicular cut. Remove any burrs with sandpaper.
- Mark the insertion depth on the pipe (typically 30–35 mm for 75mm size).
- Ensure the pipe and end cap are clean, dry, and free of debris.
- Set Up the Fusion Tool:
- Attach the appropriate 75mm male and female sockets to the fusion welding machine.
- Plug in and heat the tool to 260°C (500°F). Wait 5–10 minutes for stabilization (indicator light may confirm).
- Heating:
- Insert the pipe end into the female socket and the end cap into the male socket simultaneously.
- Heat for 18–24 seconds (exact time depends on ambient temperature; consult DADEX guidelines or tool manual for precision—overheating can deform the material).
- Fusion:
- Quickly remove from the tool and push the heated pipe into the end cap socket without twisting. Hold firmly for 10–15 seconds to align.
- Allow cooling: 4–6 minutes undisturbed (full strength after 10–15 minutes).
- Testing:
- Pressure test the system (e.g., 1.5 times operating pressure) after full cooling (at least 1 hour).
Tools Required: PPR fusion welding machine, pipe cutter, measuring tape, marker, and optionally a chamfering tool. Always wear protective gear (gloves, goggles) as the tool reaches high temperatures. Improper fusion can lead to weak joints, so follow manufacturer timings strictly.
Usage
- In Hot/Cold Water Systems: Install at pipe terminations to seal branches, enable hydrostatic testing, or prepare for future connections. It handles continuous hot water up to 70°C at reduced pressure.
- In HVAC: Use in condenser water lines or hydronic heating to cap off circuits, ensuring no air ingress or leaks. Its insulation properties minimize condensation.
- Maintenance Tips: Inspect joints periodically for signs of stress. Avoid exposure to direct sunlight (UV degrades PPR) or chemicals incompatible with polypropylene.
- Safety Notes: Operate within rated pressure/temperature limits to prevent bursting. For potable water, ensure compliance with local health standards.
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