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.

Features:

• Optional integrated LEDs to maintain correct light levels
• Higher productivity–Inspect 750 mm (29.5 in) long welds
• Two-stage seal design to improve initial vacuum
• Calibrated relief valve to control vacuum
• Calibrated vacuum gauge
• Electric pump, compressor, or combination model
• Flat and corner weld inspection models

Benefits

• More efficient
• Reduce operator fatigue
• Increase operator safety
• Field-proven durability and reliability
• User-replaceable seals

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.