Underground service Underground tank (petroleum storage) Undergrowth Underway
Definition A stud threaded at both ends and bent into a 'U' shape so both threads are parallel. Upper explosive limit. The concentration of flammable gas, vapour or mist in standardБайду номын сангаасair, above which an explosive gas atmosphere will not be formed. Ultra high frequency. The Underwriters Laboratories Inc. See Upper Limb Disorder. The air space left in a container when it is nominally full so that any expansion of the liquid will not cause overflow or excessive hydraulic pressure. A position of the hand in which the wrist is bent towards the little finger. It is a poor working position for the hand and may cause nerve and tendon damage. It reduces the ability of arm to pronate or supinate by 50%, e.g. chopping wood. A property of a material that corresponds with the maximum stress that a material can withstand before failing. A boiler which can only start up, operate and shut down under the control of the boiler management system and monitoring of the safety system. Estimate attached to a measurement result which characterizes the range of values within which the true value is asserted to lie. The United Nations Committee of Experts on the Transport of Dangerous Goods. A hazard which has been identified in a hazard analysis, and for which the operator has no control measures available, and there is not a regulatory requirement to control that hazard. An abbreviation for a regulation of the United Nations Economic Commission for Europe. United Nations Recommendations for the Transport of Dangerous Goods. (1) A back-cut lower than the horizontal scarf cut (a dangerous practice). (2) In crosscutting, the cut made from the underside of a log. (a) Any place where any person works below ground for the purpose of: (i) extracting any coal from the earth; or (ii) processing any coal extracted from the earth at that place; and (b) includes any place in which coal so extracted or processed is washed, crushed, or screened. All underground electricity, gas, water (including piped sewage), telecommunications plant, and liquid petroleum services and oil pipelines. A tank capable of storing hydrocarbon products, which is installed below the surface of the ground and entirely covered with backfill and as defined in the Dangerous Goods Regulations 1985. Layer of vegetation growing under the canopy of crop trees. Means that a vessel is not at anchor, or made fast to the shore, or aground.
