Maintaining railcars relies on air leak inspection. This case study shows how a railway company's depot solved the "drips easily" and "hard to spray in tight spots" problems of its conventional leak detector by switching to "Bubble Tester," a high-foaming leak detector with high viscosity and inverted-spray capability.
Key Takeaways
- More viscous than conventional agents, so it clings to drip-prone spots like vertical piping and foams with less spray
- Inverted-spray capability makes it easy to aim even under the car or in deep, tight spaces
- Priced on par with the previous product, so even a high-use consumable was easy to switch — supporting fewer man-hours and cost balance
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- Railway company depot (name withheld)
- Work
- Air leak inspection during railcar maintenance (pipe joints, fittings, valves, etc.)
- Challenge
- Detector dripped off vertical piping; hard to spray where posture is limited; more spray and re-spraying lowered efficiency
- Objective
- Switch to a detector that foams reliably with less spray, is usable in tight/inverted positions, and is reasonable on cost
- Product
- High-foaming leak detector "Bubble Tester" (WZA-901)
What Is Railcar Air Leak Inspection? Why Checking Under the Car and Around Piping Is Hard
At this railway company's depot, the team had long used a leak detector for air leak inspection during railcar maintenance. However, in places where working posture is limited — such as under the car or around piping — some spots were hard to spray, making the inspection work cumbersome.
In addition, on vertical piping and around parts, the detector tended to run off and would not stay on the leak point. As a result, confirming foaming reliably required more spray or repeated re-spraying, and there was room to improve work efficiency.
The Challenge: Detector Drips, Hard to Spray in Tight Spots — Balancing Efficiency and Cost
Railcar air leak inspection means checking multiple points within a limited time. The detector therefore needed the following:
- Cling firmly to the leak point — stay put even on vertical piping instead of running off.
- Foam clearly with less spray — confirm foaming reliably while reducing re-spraying.
- Usable in tight spaces and pointing down/inverted — easy to spray even under the car or in deep spots.
At the same time, in switching from the existing product, price was also an important comparison point alongside usability. Because it is a high-use consumable on site, a large price increase would make it hard to adopt even if the quality was good.
The Solution: High Viscosity & Inverted Spray with the "Bubble Tester" High-Foaming Leak Detector
The solution we proposed was the high-foaming leak detector "Bubble Tester" (WZA-901). Bubble Tester is more viscous than conventional leak detectors, so it clings with less spray even on hard-to-check spots such as vertical piping, detecting leaks by foaming. Its inverted-spray capability also makes it easy to spray in tight spaces.
When the customer compared it with their conventional leak detector, they valued how it resists dripping thanks to its high viscosity and that it can spray even when inverted. Furthermore, because its price was on par with the previous product, the ease of switching on site without strain also helped drive adoption.
- High viscosity, resists dripping — stays on vertical or angled spots, making foaming easy to confirm.
- Clings and foams with less spray — sticks with a small amount even on hard-to-check spots, revealing leaks by foaming.
- Inverted-spray capability — easy to aim in tight spaces and pointing down/inverted.
- Priced on par with the previous product — easy to adopt even as a high-use consumable.
| Comparison | Conventional leak detector | Bubble Tester |
|---|---|---|
| Vertical / angled spots | Runs off easily and won't stay on the leak point | High viscosity resists dripping; clings and foams with less spray |
| Spray volume / re-spraying | Needs more spray to confirm foaming, often with re-spraying | Foam is easy to confirm even with less spray |
| Tight / downward / inverted | Hard to spray where posture is limited | Inverted spray makes it easy to aim, even in tight spots |
| Price (consumable) | — | On par with the previous product, easy to switch without strain |
The Results: Reliable Foaming with Less Spray — Fewer Man-Hours and Cost Balance
In railcar air leak inspection at the depot, it is used to check pipe joints, fittings and around valves. Thanks to its high viscosity, the detector stays on vertical and angled spots more easily, making the foaming easier to see.
- More reliable leak detection — stays on vertical/angled spots and foams clearly even with less spray.
- Better workability in tight spots and under the car (fewer man-hours) — inverted spray makes aiming easier, so the work is easier than before.
- Cost balance — spray volume is easier to keep down, and the price is on par with the previous product, so it is easy to adopt as a consumable.
As a result, the depot valued the usability, visibility and cost balance in railcar air leak inspection and adopted it as a site-standard product.