Union 25mm RAKtherm PPRc

Description

Union 25mm

 

RAKtherm imported PPRc, Food graded third generation Poly propelene Random with Co-polymer
materials. contact 0322-3540656

 

 

What is Union 25mm RAKtherm PPRc ?

 

The RAKtherm PPRc Union 25mm PN 25 is a premium, high-capacity three-piece mechanical disconnection fitting manufactured in the UAE by Hashim Industry. Designed to accommodate higher flow rates in demanding hot/cold water distribution networks and mechanical HVAC installations, this 25mm fitting allows for the effortless isolation, servicing, or replacement of inline machinery without requiring cuts to the rigid piping network.

1. Description & Overview

The RAKtherm 25mm Union features a heavy-duty, three-piece configurable design consisting of two independent PPRc socket fusion tailpieces joined together by a robust, threaded plastic union nut.

Molded entirely from specialized Polypropylene Random Copolymer (PP-R Grade 100), its PN 25 rating guarantees an extra-thick wall construction (SDR 5). This makes it highly resistant to extreme pressure spikes, cyclic water hammer forces, and rapid temperature fluctuations. This size is specifically engineered to handle the main distribution loops and branch connections of medium-to-large mechanical water supply projects.

2. Technical Specifications

Specification Parameter	Detail Value / Compliance Standard
Brand / Origin	RAKtherm / United Arab Emirates (UAE)
Material Composition	Premium PP-R (Polypropylene Random Copolymer Grade 100)
Nominal Diameter (Size)	25 mm Socket Fusion on both ends (Matches 3/4″ PPRc Pipe)
Pressure Rating	PN 25 (2.5 MPa / 25 Bar / Approx. 362 PSI)
Standard Dimension Ratio	SDR 5 / Pipe Series 2 (Industrial/Heavy Commercial Grade)
Applicable Standards	DIN 8077/8078 (German Quality Standards), DVGW, SKZ, TUV
Temperature Range	Continuous: 10°C to 90°C | Flash Surge: Up to 100°C
Sealing Gasket	High-grade, thermal-resistant EPDM O-ring
Color	Light Green (Signature RAKtherm branding)

3. System Applications & Usage

The 25mm PN 25 union acts as a vital structural link in major plumbing and mechanical frameworks:

• HVAC Chilled & Heated Water loops: Connecting 25mm main feed lines to larger fan coil units (FCUs), hydronic manifolds, radiant floor heating matrix headers, and zone control valves.

• Commercial Booster Pump Stations: Installed on both the suction and discharge lines of water booster pumps to handle constant operational vibrations and allow quick equipment swaps.

• Central Water Heater & Boiler Arrays: Serves as a thermal-resistant, non-corrosive bridge directly linked to commercial solar water heating panels and boiler storage loops.

• Main Water Riser Splits: Placed at structural floor transitions or zone check-valves within high-rise buildings for quick zoning control.

4. Installation & Fusion Guidelines

Because the 25mm profile contains more mass than smaller sizes, strict adherence to heating times is vital to ensure structural integrity across high-pressure PN 25 joints.

Fusion Parameters (For 25mm Size)

• Welding Matrix Temperature: $260^\circ\text{C} \pm 10^\circ\text{C}$

• Heating Time: 7 Seconds (Slightly longer than 20mm due to thicker walls)

• Assembly / Joining Time: 4 Seconds maximum

• Cooling Time: 2 Minutes minimum (Total undisturbed setting time)

Step-by-Step Installation Steps

1. Unscrew & Disassemble First: Always completely take apart the three-piece union before introducing heat. Welding the fitting while fully assembled will permanently melt, warp, or destroy the internal EPDM O-ring and damage the compression threads.

2. Clean & Prep: Cut the 25mm PN 25 PPRc pipe square using professional shears. Ensure both the pipe ends and the union’s internal socket faces are dry, spotless, and free of dust. Mark a 15mm fusion depth on the pipe ends.

3. Heat Symmetrically: Slide the first pipe end and one half of the union body onto the $260^\circ\text{C}$ welding adapters at the same time. Hold firmly without turning for exactly 7 seconds.

4. Align & Join: Pull the parts cleanly from the iron and push the pipe straight into the union socket up to the 15mm mark. Do not twist. Hold still for 4 seconds to lock the homogenous joint ring. Repeat this entire process for the second half of the union on the opposite pipe.

5. Check the Seal: Once both halves are cold, verify that the heat-resistant EPDM O-ring is resting completely flat inside its seating groove.

6. Thread and Lock: Bring the two halves together in a straight line. Screw the union nut onto the receiving threads by hand first to avoid cross-threading, then tighten firmly with a non-marring strap wrench or spanner.