Liquid Nitrogen Foot Pump Safety Guidelines

Liquid nitrogen foot pumps are frequently used in laboratories, sample banks, and industrial settings. They allow for easier and more stable liquid nitrogen transfer, but improper operation can lead to risks such as frostbite, oxygen deficiency, or equipment damage. Therefore, mastering the correct safe operating procedures is crucial.

Before using a liquid nitrogen foot pump, operators should ensure good ventilation. Liquid nitrogen vaporizes rapidly; large-scale use in confined spaces can cause a drop in oxygen concentration, leading to oxygen deficiency hazards. Especially in underground laboratories, warehouses, or poorly ventilated workshops, exhaust systems must be turned on beforehand, and oxygen concentration must be confirmed to be within safe limits.

Personal protective equipment (PPE) is essential. Cryogenic gloves, goggles or face shields, and long-sleeved lab coats are basic requirements. Although operating a foot pump does not require direct contact with liquid nitrogen, splashes, spills, or accidental detachment of tubing can still pose a danger; therefore, protective equipment effectively reduces these risks.

When connecting the foot pump to the liquid nitrogen tank, ensure the interface is clean, free of frost, and free of cracks. If ice or blockage occurs at the interface, stop operation immediately and wait for complete thawing before resuming. Do not apply excessive force when connecting the pipes to avoid damaging the interface or causing liquid nitrogen leakage.

Before starting operation, check the foot pump's pipes for damage, aging, cracks, or looseness. Also, check the smoothness of the foot pedal's rebound. Address any abnormalities before use to prevent malfunctions during operation.

When actually pumping liquid nitrogen, operate smoothly and avoid sudden, forceful stomping to prevent liquid nitrogen splashing or pipe vibration causing it to dislodge. Maintain a consistent foot pedal rhythm to ensure a stable liquid nitrogen flow and prevent equipment damage due to excessive pressure.

If you hear abnormal noises, see abnormal frost on the pipes, or feel a leak during operation, stop immediately, move away from the equipment, and ensure proper ventilation before checking for problems. Never continue operation with a large amount of liquid nitrogen vaporized.

After use, close the liquid nitrogen tank valve first, then disconnect the foot pump. Residual liquid nitrogen in the pipeline should be allowed to vaporize naturally. Do not attempt to forcibly evacuate or disassemble frosted components. Clean and store the equipment only after it has completely returned to room temperature.

Regular maintenance is also crucial for safety. The foot pump's pipelines, joints, and seals should be inspected for wear regularly and replaced as needed. When not in use for extended periods, the equipment should be stored in a dry, well-ventilated environment free of corrosive gases.

The safe use of a liquid nitrogen foot pump hinges on standardized operation, good ventilation, and proper protective measures. By adhering to basic safety principles, you can maximize the safety of personnel and equipment while improving work efficiency.