Important technical terms
Oil field pipes
Pipes used appropriated in the petroleum industry or for the pipelines of petroleum and natural gas. There is a differentiation between two types:
- Subsurface pipes: casing, tubing, drill pipes.
- Surface pipes: line-pipes and line-pipes with increased test requirements.
Oil field pipes are standardized by the American Petroleum Institute (API). These specifications meet the special requirements of the petroleum industry, represent the respective current state of the art and are based on the results of intensive tests in practice.
OPP brand (SBER)
The abbreviation OPP stands for "Out of Product Program" and marks all those brands of the SBER brand database, which are not manufactured by SBER.
Orange skin
This term designates a tube surface, which due to its appearance is comparable with orange peel. The tube surface is rough and contains irregularly spread scars and grooves, which compared to the "elephant skin" are less deep. The formation of such a surface can have various causes, among others, badly formable preliminary material, defective glass lubrication, but also too long heating in the rotary hearth furnace.
Ovality
Ovality (out-of-roundness) means the deviation from circularity, which cannot always be completely prevented during rolling as well as drawing, pressing, grinding, etc. of work-pieces with a circular cross section.
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