ME133.pdf - RETURN ME133 Air Compressor Damage(3 Cases Technical committee I Air Compressor Damage(Case I 1 Outline of breakdown During voyage abnormal

ME133.pdf - RETURN ME133 Air Compressor Damage(3 Cases...

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1 The Marine Engineer Mar.1990 ME133 Air Compressor Damage (3 Cases) Technical committee I Air Compressor Damage (Case I) 1. Outline of breakdown During voyage, abnormal sound was heard in the vicinity of the low pressure union valve of the main air compressor (TANABE PNEUMATIC MACHINERY CO., LTD: Type H-74). After immediately stopping operation, the cylinder cover was opened and the union valve was inspected. From the inspection, settling of both the union valve seat gasket and the cylinder head gasket, and free up and down movement of the union valve between both gaskets was observed. 2. Cause of breakdown When the low pressure union valve was replaced with a spare unit previously, although the union valve seat gasket was replaced, the cylinder head gasket was left unchanged and its use was continued. This caused incomplete fitting of the union valve, and due to pumping action of the piston, resulted in gradual increase in up/down movement of the union valve and emission of noise. (See Figs. 1 & 2.) 3. Countermeasures A general rule has been set to replace the packing every time the cylinder cover is opened.
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