V750 Vacuum Box Bubble Leak Testing of Lap Welds

  • Integrated LED lighting
  • Calibrated gauge
  • Extremely rugged construction
  • Designed to API 650 & 653 recommendations
Key Features:
  • Integrated LED to maintain correct light level (optional)
  • Higher productivity due to 750 mm width
  • Two stage seal design to improve initial vacuum
  • Calibrated relief valve to control vacuum
  • Calibrated vacuum gauge
  • Electric pump, compressor or combined versions
  • Flat & corner weld inspection models
  • Field proven durability & reliability

Bubble leak testing or vacuum box testing is an integral part of a tank inspection process as recommended by API and other international standards to establish the condition of a tank bottom plate weld or shell to bottom plate weld.

The latest edition to Silverwing’s vacuum box range is the V750 which has been completely redesigned with the operator and API 650 / 653 inspection standards in mind.

The design incorporates a 750 mm weld inspection length, extremely rugged body, calibrated vacuum gauge and vacuum relief valve, internal LED’s to ensure correct visibility along the test weld and a new two stage seal designed to maximise efficiency and reduce operator fatigue.

Vaccum box bubble leak testing of tank floor weld
LED light for correct lighting
Calibrated vacuum gauge

Vacuum gauge and relief valve

The V750 has an industrial vacuum gauge rated to 30 in Hg as well as a calibrated vacuum relief valve. The use of a calibrated vacuum relief valve ensures the correct vacuum is generated as recommended by international standards. The advantage of the relief valve is once the required vacuum has been generated (20 or 10 inch Hg) the relief valve opens and maintains the required vacuum preventing too great a vacuum being generated which can damage the vacuum box and cause injury to the operator.

Electric pump or compressor driven

The vacuum is generated by the use of an electric vacuum pump or by use of an Air Vacuum Generator (AVG) and external compressor. Inspection companies tend to use the electric pump with the vacuum boxes due to its greater flexibility while construction companies tend to use the AVG based systems.

High and low pressure models

The vacuum boxes are rated to either 20 inch Hg (10psi/0,7bar) which are recommended for in-services tanks or 10 inch Hg (5psi/0.37bar) which are recommended for new build tanks.

Calibrated Vacuum Gauge

Calibrated Gauge

The V750 vacuum box is supplied with an industrial 100 mm face glycerine filled pressure gauge rated to 30 in Hg as required by ASME V Article 10 – Bubble Test Vacuum Box Technique. Along with the vacuum gauge is a vacuum relief valve which prevents the box from drawing too great a vacuum which could damage the box.

V750LED - build in LED's for maintaining correct light level

LED Lights

The optional built in LED lights provide the recommended light intensity along the weld under test as recommended by API 650. The LED lights can be switch on and off with a simple push button eliminating the need for the operator to move their standard halogen lights as they move round the tank.

Calibrated Vacuum Gauge

Carry Bag

A custom manufactured nylon carry bag with wipe clean lining, a hard base to protect the vacuum box seal, storage pockets for batteries and chargers. With the operator in mind the storage bag has built in wheels to allow operator to easily transport the equipment whilst on site.

V750 LED
V750LED Vacuum Box
Dimensions:
L 780 x W 300 x H 230 mm
Weight:
11 kg
Pressure Rating:
20 inch Hg
Weld test length:
750 mm
V750 LED F
Vacuum Pump Driven
V750 LED AVG:
Compressor Driven
V750 LED DUAL:
Pump or Compressor Driven
V750 (No LED Lights)
V750 Vacuum Box
Dimensions:
L 780 x W 300 x H 230 mm
Weight:
11 kg
Pressure Rating:
20 inch Hg
Weld test length:
750 mm
V750 F
Vacuum Pump Driven
V750 AVG:
Compressor Driven
V750 DUAL:
Pump or Compressor Driven
Vacuum Pump
Vacuum pump for vac box
Dimensions:
L 500 x W 250 x H 310 mm
Weight:
27.70 kg
110V Model:
VP110
240V Model:
VP240
Vacuum Hose / Airline
Vaccum Hose
Dimensions:
10 m in Length 13mm O/D diameter
Weight:
3.2 kg
VACH2C:
for use with vacuum pump
Connector Type:
1/2" Hose Tail both ends
VACH1C:
for use with air compressor
Connector Type:
1/2" Hose Tail / 1/2 BSPP
Claw

Vacuum Box Order Codes & Specifications

Order Code
Vacuum Type
Vacuum Rating
Weld Type
LED
Calibrated Gauge
V750LED-F
Vacuum pump driven
20 inch Hg
Flat Plate
Yes
Yes
V750LED-AVG
Compressor driven
20 inch Hg
Flat Plate
Yes
Yes
V750LED-DUAL
Vacuum pump or compressor
20 inch Hg
Flat Plate
Yes
Yes
V750-F
Vacuum pump driven
20 inch Hg
Flat Plate
No
Yes
V750-AVG
Compressor driven
20 inch Hg
Flat Plate
No
Yes
V750-Dual
Vacuum pump or compressor
20 inch Hg
Flat Plate
No
Yes
V400C
Vacuum pump driven
20 inch Hg
Shell to Floor
No
No
V400CAVG
Compressor driven
20 inch Hg
Shell to Floor
No
No
V400D
Vacuum pump or compressor
20 inch Hg
Shell to Floor
No
No
V600LP
Vacuum pump driven
10 inch Hg
Flat Plate
No
No
V600LPAVG
Compressor driven
10 inch Hg
Flat Plate
No
No
V400LP
Vacuum pump driven
10 inch Hg
Shell to Floor
No
No
V400LPAVG
Compressor driven
10 inch Hg
Shell to Floor
No
No

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