Aiming at the leakage problem of L70 helium liquefier cold box,after diagnosis,analysis and discussion with manufacturers and other parties,the final plan is determined to disassemble and repair the cold box.According to the judg-ment of the leak location of the cold box and the difficulty of the actual operation,a detailed leak detection scheme and con-struction process were formulated,which were divided into three parts:equipment disassembly,leak search,repair and verification.After more than 40 days of maintenance,the equipment was repaired.The liquefaction efficiency of the helium liquefier was tested and analyzed,and it was found that the liquefaction output was higher than the contract performance in-dex of the equipment regardless of whether there was liquid nitrogen precooling after the maintenance.It could be concluded that the leak point had been effectively repaired,and technical improvement suggestions were put forward from the perspec-tive of maintenance and daily maintenance.
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