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Water plugging airbag for home PVC pipeline repair

Mr. Wendy October 24, 2025

1. What is a Water Plugging Airbag?

A water plugging airbag is an inflatable rubber/fiber composite tool designed to temporarily block water flow in pipelines during repairs. It expands via compressed air to seal the pipe cross-section, creating a watertight barrier through friction between the airbag surface and the pipe inner wall. For home PVC pipelines, it’s ideal for leak repairs, component replacements, or water-tightness tests.

2. Key Selection Criteria for Home Use

2.1 Pipe Diameter Matching

Choose the airbag model strictly according to your PVC pipe’s inner diameter (common home sizes: 50mm, 75mm, 110mm):
PVC Pipe Diameter
Recommended Airbag Model
Inflation Pressure
Weight
50mm
HX50-A
0.15 MPa
0.015kg
75mm
HX75-A
0.15 MPa
0.020kg
110mm
HX100-A
0.15 MPa
0.32kg
Note: Never use a smaller airbag for a larger pipe (risk of failure).



2.2 Material Compatibility

  • Enhanced Natural Rubber: Best for general PVC pipes (corrosion-resistant, flexible, reusable).

  • TPU Composite: For long-term use (2-year lifespan) and acidic wastewater pipes.

  • Avoid recycled rubber products (poor airtightness).

2.3 Pressure Rating

Home PVC pipelines typically bear low pressure (≤1 bar). Select airbags with a minimum safety factor of 3x (e.g., 0.25MPa working pressure for 0.8bar pipe pressure).

3. Step-by-Step Operation Guide

3.1 Pre-Operation Preparation

  1. Inspect the Airbag: Inflate to 0.15MPa with a hand pump; check for leaks using soapy water.

  1. Clean the Pipe: Remove debris, burrs, or sharp objects (prevents punctures).

  1. Assemble Tools: Connect airbag → pressure gauge → 6m air hose → pump.

3.2 Installation & Inflation

  1. Insert the Airbag: Roll it vertically and place 30cm away from pipe joints/elbows (joints reduce sealing performance).

  1. Secure Connections: Tie the air hose to the airbag with wire (prevents detachment).

  1. Inflate Gradually:

    • Start with slow inflation (0.05MPa/min)

    • Stop at the recommended pressure (e.g., 0.25MPa for 110mm pipes)

    • Monitor the gauge—rapid pressure spikes indicate blockage (release air immediately).

3.3 Post-Repair Removal

  1. Deflate completely (open the air valve for 2 minutes)

  1. Pull out gently (avoid dragging to prevent scratches)

  1. Clean with water and store in a dry, cool place.

4. Safety & Maintenance Tips

  • Pressure Limits: Never exceed 0.3MPa (risk of bursting); check pressure hourly during repairs.

  • Pipe Protection: Do not use on pipes with cracks or uneven inner walls (may cause airbag damage).

  • Lifespan Management: Replace natural rubber airbags every 12 months; TPU models every 2 years.

  • Emergency Handling: If pressure drops suddenly, stop work and repressurize—leaks often occur at hose connections.

5. Top Recommendations for Home Use

Brand
Model
Price Range
Key Advantage
Fuli
110#
(15–)30
Acid-resistant, compact design
Jerry Borg
HX100-A
(30–)50
High-pressure resistance
Generic
PVC Valve Airbag
(8–)15
Budget-friendly for small pipes
Source: Manufacturers’ data & market listings




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