27.07.2011

This is the action of enlarging a whole for drilling or for pipeline. One starts often with a small pilot whole which is easier and cheaper to do and makes it easier to ensure that the whole is directed properly. Then if a greater hole is needed, either in drilling operations because something went amiss and requires further and large casing, or simply because it is pre-planned to make small pilot whole when doing for instance horizontal drilling, the next step is called reaming and uses as ream to enlarge the size of the hole.
Pre-reaming operations are carried out to enlarge the drilled hole to a size suitable for accepting the product pipe. Pull-back pipe is added behind the reamer. Depending upon the pipe diameter to be installed several pre-reaming operations may be necessary, each progressively enlarging the hole.

20.07.2011
19.07.2011

The vessel or pool releasing a hazardous chemical into the atmosphere

The distance above the ground at which a chemical is being released.

Either the rate the chemical enters the atmosphere or the burn rate, depending on the scenario. A chemical may escape very quickly (so that source strength is high), as when a pressurized container is ruptured, or more slowly over a longer period of time (so that source strength is low), as when a puddle evaporates

Heat released during a fire and explosion that may pose a hazard to people and structures. The effects people experience will depend on both the level of thermal radiation and the length of time they are exposed to it.

18.07.2011

MEG substitute

17.07.2011

The ratio of the amount of water vapor that the air contains to the maximum amount of water vapor that it could hold at the ambient temperature and pressure. Relative humidity is expressed as a percentage. When relative humidity is 50%, the air contains one half as much water vapor as it could potentially hold.