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The gas-lift mandrel is a device installed in the tubing string of a gas-lift well onto which or into which a gas-lift valve is fitted. There are two common types of mandrels. In a conventional gas-lift mandrel, a gas-lift valve is installed as the tubing is placed in the well. Thus, to replace or repair the valve, the tubing string must be pulled.
One objective of a good design review is to examine the results of validation testing, making all product weaknesses visible. This examination involves applying another GD 3 concept, design review based on test results (DRBTR). When applying DRBTR, we must, wherever possible, observe the product test before, during and after completion.
An engineering verification test (EVT) is performed on first engineering prototypes, to ensure that the basic unit performs to design goals and specifications. [1] Verification ensures that designs meets requirements and specification while validation ensures that created entity meets the user needs and objectives.
In statistics, verification bias is a type of measurement bias in which the results of a diagnostic test affect whether the gold standard procedure is used to verify the test result. This type of bias is also known as "work-up bias" or "referral bias". [1] [2] In clinical practice, verification bias is more likely to occur when a preliminary ...
Design for verification (DfV) is a set of engineering guidelines to aid designers in ensuring right first time manufacturing and assembly of large-scale components.The guidelines were developed as a tool to inform and direct designers during early stage design phases to trade off estimated measurement uncertainty against tolerance, cost, assembly, measurability and product requirements.
A pulser pump makes use of water that flows through pipes and an air chamber from an upper reservoir to a lower reservoir. The intake is a trompe, which uses water flow to pump air to a separation chamber; air trapped in the chamber then drives an airlift pump.
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The implementation or design is regarded as a model of the system, whereas the specifications are properties that the model must satisfy. [ 2 ] An important class of model-checking methods has been developed for checking models of hardware and software designs where the specification is given by a temporal logic formula.
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