The V750 vacuum box was completely redesigned with operators and API 650/653 inspection standards in mind. Bubble leak (or vacuum box) testing is an integral part of tank inspections as required by the American Petroleum Institute (API) and other international standards associations to establish the condition of tank bottom plate welds and shell-to-bottom plate welds.
The V750 vacuum box is designed to inspect 750 mm (29.5 in) long welds. It is extremely rugged body, calibrated vacuum gauge and vacuum relief valve, internal LED’s to ensure correct visibility along the test weld and a new seal designed to maximise efficiency and reduce operator fatigue.
More Efficient: Vacuum Box LEDs
The optional built-in LEDs provide the recommended light intensity along the weld under test by API 650. The internal LEDs eliminate the view window reflection that occurs when external lights are used to brighten the weld inspection area. You can easily turn the LEDs on and off, eliminating the need for you to move standard halogen floodlights as you move around the tank.
Better Accuracy: Calibrated Gauge
The V750 vacuum box comes with an industrial 50.8 mm (2 in) face pressure gauge rated to 762 mm (30 in) of mercury as required by ASME V Article 10–Bubble Test Vacuum Box Technique. The calibrated gauge offers the necessary confidence in your inspections by ensuring the proper recommended vacuum is generated.
Safer: Vacuum Relief Valve
Using a calibrated vacuum relief valve ensures the recommended vacuum under international standards. The advantage of such a valve is that once the necessary vacuum is achieved, the relief valve opens and maintains this vacuum, preventing it from damaging the vacuum box or injure the operator.
Electric Pump or Compressor Driven
The V750 generates a vacuum using an electric pump or an air vacuum generator (AVG), and an external compressor. Inspection companies tend to use the electric pump because it is more flexible, while construction companies tend to use AVG systems.
High-Pressure and Low-Pressure Models
Vacuum boxes are rated to 20 in of Hg (10 psi/0.7 bar) [recommended for in-services tanks] or 10 in Hg (5 psi/0.4 bar) [recommended for new tanks]. V750 models are rated to 20 in of Hg, but if you are interested in a low-pressure model, review the V600LP and V400LP.
Dimensions (W × D × H)
- 935 × 256 × 190 mm (36.8 × 10 × 7.5 in) [LED model]
- 896 × 256 × 190 mm (35.3 × 10 × 7.5 in) [non-LED model]
11 kg (24.2 lb)
508 mm of Hg (20 in of Hg)
Test weld test length
750 mm (29.5 in)