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Ingegneria meccanica: Industria petrolifera
| English |
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| Noun phrase |
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| Countable |
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| A stationary metal framework on the top of the derrick or mast of a drilling rig that holds sheaves that rotate on a horizontal shaft mounted on bearings with a greased lubricating system. The drilling line goes through it. It can also hold a sheave for the coring reel drum and small sheaves for a Manila rope from the friction cathead. |
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| Sh91 |
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| In general, the crown and travelling block sheave diameter should be 30-35 times the wire-line to prevent excessive wear and to increase the fatigue life of the drilling line. |
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| Sh91 |
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| Mechanics |
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| block |
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| taglia fissa |
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| 3 |
