TC170 API Spec 4F Drilling Rig Main Parts Crown Block in Oilfield Crown block 1. The design and manufacture of the series crown block conform to API Spect 4F and 8A specifications, and have the right to use the API logo. 2. In line with the industry standard "oil rig main lifting equipment" SY/T5527 requirements 3. Pulley rope groove by quenching treatment, wear resistance, long life 4. Rope retaining rod or rope clamping groove is provided to prevent the wire rope from
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