安全卡瓦（Safety clamp）在钻铤上无接头台肩，用普通卡瓦卡紧在转盘上时可能滑落井中。因此，在卸下吊卡前要卡上安全卡瓦，扣上吊卡以后再去掉。
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上紧安全卡瓦 Secure the safety clamp
无台肩钻铤用安全卡瓦 horse collar
安全卡瓦销子 safety clamp dowels
油管安全卡瓦 [油气] tubing safety slip
如果卡紧管柱的卡瓦或吊卡失去了其抓力，则安全卡瓦可防止工具管柱意外地掉落井下。
The safety clamp prevents the tool string from being dropped downhole accidentally if the slips or elevators securing the string lose their grip.
他在亚利桑那州的瓦丘卡堡(Fort Huachuca, Ariz .)接受安全检查(译注：security clearance，确认是否忠诚)并受训成为情报分析员。及后获派往纽约州，鼓堡(Fort Drum, N.Y.)，第十山地师第二旅。
He was granted a security clearance and trained as an intelligence analyst at Fort Huachuca, Ariz., before being assigned to the Second Brigade 10th Mountain Division at Fort Drum, n.y..
这处在现实和法律之间的真空地带增加了国际安全和公共安全问题。” 联邦调查局的总法律顾问瓦勒理.E.卡波尼说道。
This gap between reality and the law has created a significant national security and public safety problem," said Valerie E. Caproni, the FBI's General Counsel.
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