The Model 3510 Safety Test Chamber is completely self-contained and only requires an external supply of dry nitrogen (or other inert gas) and a 115 VAC power source for operation.
All operating controls and elements, including a regulator for the gas supply, 10:1 booster pump, source pressure gauge, regulated pressure gauge, test pressure gauge, control and vent valves, and a mechanical timer, are housed within the unit. The pneumatic and electrical wiring schematics below depict the various test chamber components.
To set-up for testing, the item undergoing evaluation is connected to the quick-disconnect discharge port inside the test chamber via a flexible braided stainless steel jumper hose. A nitrogen supply is also connected to the inlet fitting on the side of the chamber to facilitate testing. After the chamber door is closed and locked, the gas shutoff valve and regulator are opened, and pressure is metered to the test item using a precision soft seat control valve on the front panel. A 4.5-inch diameter test gauge mounted in the center of the front panel indicates the pressure being applied to the test item.
To increase the test pressure up to the 20,000 psi maximum operating range, the user turns a three way valve on the front panel to cycle the booster pump. Each time the booster cycling valve is opened, the source gas drives a differential area piston in the booster pump, which multiplies the pressure being supplied to the test item by a factor of 10. Check valves on the high pressure end of the booster pump prevent reverse gas flow. The operator continues to cycle the valve for the booster pump until the test gauge indicates the desired pressure.
Once the desired proof or test pressure is reached, the built-in mechanical timer is used to count down the test duration; a bell will sound when the specified time has elapsed. To release the test pressure at a controlled rate, the operator simply closes the control valve and opens the vent valve on the front panel.
The Model 3510 chamber incorporates numerous features designed to ensure the safety of the operator. Passive safety features include a chamber door constructed from double-walled 10-gauge steel, and a 6” x 10” viewing window consisting of 2” thick acrylic plastic. The back, sides, floor, and roof of the chamber are also constructed using welded 10-gauge steel, with a 1” thick polyethylene plastic liner. Should a test item burst, labyrinth baffles in the back wall of the chamber, shown in the photo above, allow pressure to vent rearward while preventing the release of dangerous fragments.
Active safety features include an interlocking device that prevents test pressure from being applied until the door is closed, a red top-mounted warning light that flashes while an item inside the chamber is pressurized, and a warning buzzer that sounds if the door is opened while the system is under pressure.