Stridsbåt 90 H(alv) (Strb 90 H; CB90) is a class of fast military assault craft used by several countries after being originally developed for the by . Its name means Combat Boat 90 Half; the 90 refers to the year of acceptance (1990) and Half refers to the fact that it can carry and deploy a half platoon of amphibious infantry (18 men) fully equipped. The CB90 is an e.
[pdf] Drilling derricks and Rig Masts consist of a steel framework with a square or rectangular cross-section. Their purpose is to support the hoisting equipment and rack the tubulars while tripping pipe. The numbe.
[pdf] This chapter will explain the various types of drilling rigs used today. It will try to touch on the unique features of each rig type and their relative advantages and drawbacks. This chapter is not meant to be.
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