But in case it has to evacuate the area around the damaged well, which lies some 50 miles off the Louisiana coast, BP also placed a special plug inside the well's casing.
Due to local HV (high voltage), disassembly of casing and any part from this instrument is forbidden without special approval.
有些地方具有高电压，未经特别许可严禁拆卸仪器外壳和任何部件。
3
The casing is thus free to yield to thermal expansion by moving forward on special slide elements between the front-end brackets and the front bearing pedetal.