Aquadex Dadex upvc Pressure pipe 3/4″

Description

 upvc  3/4″ pressure pipe

 

Aquadex Dadex local Manufacturer Suppliers in Islamabad Pakistan Contact 0322-3540656 ASTM and BSS uPvc pipes sch-80 (E-class)

 

What is Aquadex Dadex upvc pipe 3/4″ pressure pipe ?

 

The Aquadex range by Dadex is the premier uPVC pressure piping system in Pakistan, offering solutions that bridge both American (ASTM) and British (BS) standards. When dealing with 3/4″ piping, it is vital to distinguish between Schedule 40/80 (inch-based) and BS Class (metric-based) as they are not directly interchangeable without adapters.

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1. ASTM Series (Schedule 40 & Schedule 80)

These pipes follow the ASTM D1785 standard. While they share the same Outside Diameter (OD), their wall thickness and pressure ratings differ significantly.

 

Specification	Schedule 40 (Sch-40)	Schedule 80 (Sch-80)
Nominal Size	3/4″ ($26.67$ mm OD)	3/4″ ($26.67$ mm OD)
Wall Thickness	$2.87$ mm (Standard)	$3.91$ mm (Heavy Wall)
Pressure Rating (23°C)	480 PSI (approx. 33 Bar)	690 PSI (approx. 47 Bar)
Primary Use	Residential water supply, irrigation.	Industrial plants, high-rise risers.
Threading	Not recommended to thread.	Suitable for threading.

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2. British Standard (BS) Series

Dadex also manufactures uPVC pressure pipes under BS 3505/3506 (often referred to as Class C, D, or E). For a 3/4″ equivalent in the BS system:

 

• Size: Often referred to by its metric OD (e.g., 25mm or 26.7mm depending on the specific standard used).

• Pressure Classes: * Class C: 9 Bar (130 PSI)

  • Class D: 12 Bar (174 PSI)

  • Class E: 15 Bar (217 PSI) — This is the most common high-pressure BS grade in Pakistan.

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3. Usage in HVAC & Water Systems

• HVAC Condensate & Chilled Water: * Sch-40 is the standard for condensate drain lines due to its cost-effectiveness.

  • Sch-80 is preferred for chilled water supply lines in commercial buildings where the pipe might be exposed to physical impact or higher vibration from pumps.

• Potable Water Supply: * Aquadex is Lead-Free and certified for drinking water. It does not impart taste or odor to the water.

  • The ASTM Sch-80 is frequently used for vertical “main headers” in apartment buildings to handle the hydrostatic pressure of the water column.

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4. Technical Performance & Comparison Aquadex Dadex upvc Pressure pipe 3/4″

Feature	Benefit
Corrosion Resistance	Completely immune to “pitting” and galvanic corrosion common in GI pipes.
Thermal Conductivity	Very low; helps maintain water temperature better than metal pipes, reducing insulation costs in HVAC.
Hazen-Williams $C$ Factor	150 (remains constant over time), ensuring high flow rates and low pumping costs.

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5. Installation Essentials

1. Jointing: Always use Dadex Solvent Cement for Aquadex systems to ensure a chemical bond. For Sch-80, a heavy-bodied cement is recommended due to the thicker walls.

    

2. Transitions: If connecting Aquadex (ASTM) to a BS-standard fitting, you must use a Step-up/Step-down adapter or a threaded transition, as the ODs may differ slightly.

3. Support: Space pipe hangers every 4 to 5 feet for 3/4″ horizontal runs to prevent sagging, especially if the water temperature fluctuates.