This paper presents a comprehensive approach to development and qualification of flexible fiber reinforced pipe (FFRP®) for deep water pipeline commissioning applications. Flexible fiber reinforced pipe is a light weight, high strength, high fatigue resistance unbonded flexible pipe structure employing composite materials for the pressure and tensile armor layers. Lightweight downlines enable smaller service vessels to conduct pipeline commissioning operations in deep and ultradeep water, improving the overall pipeline commissioning economics relative to steel armored flexible pipe or steel coil tubing. FFRP's robust design and good fatigue resistance enable it to be used in multiple similar commissioning projects with different vessels. The development and qualification summary presented in the paper is also relevant to the application of FFRP for dynamic risers permanent oil and gas production and water and gas injection applications. Work in progress towards achieving the permanent application qualification is presented in the paper. Lighter weight flexible pipe structures simplify riser configurations and enable smaller installation and operation vessels in ultradeep water, reducing overall installed cost. The following aspects are addressed in the paper:Pipe and end fitting design requirements and design elementsFailure Mode Identification and Risk Ranking in accordance with DNV RP A203Qualification of the materials used in the pipe structure, including the confirmation of characteristic properties for design purposesSmall scale tests to evaluate pipe layer performance, and interaction with other layers, and tensile armor anchoring in the end fittingFull scale tests to qualify the pipe structure. The results of tests on two pipe structures, 3.5-inch ID, 280 barg (4065 psig) design pressure for 1600 meters water depth, and 4-inch ID, 294 barg (4265 psig) design pressure for 1500 meters water depth are presented.Independent verification of the design methodology and qualification test program The qualification program confirmed the suitability of the materials and pipe structure for the pipeline commissioning application, and built a foundation for qualification of the pipe structure for ultradeep water permanent riser applications. Introduction As offshore field development moves into deeper water, commissioning of the newly installed subsea pipelines calls for a downline pipe with features including sufficient flow capacity, low flow resistance, lightweight, high strength, reelable, good flexibility and fatigue resistance. Such downline will enable the installation contractor to conduct the commissioning work with smaller, lower day rate vessels and cut down total operation time. Typical pipeline commissioning work includes flooding, pigging, hydrostatic testing, dewatering and MEG swabbing operations. For each project, the downline may be deployed and retrieved up to 50 times. It is also highly preferred that the downline will be suitable for redeployment for similar applications in multiple fields.

In ship pitch balance system, serious flow impact and water hammer occur because of the turning on and off of valve during the procedure of water-shift. Flow area of the ball valve used most on ship was derived, and mathematical models of pressure lost before and after valve were formulated. Besides, considering the fact of water-shift balance system, an AMESim model was established based on improved traditional throttle model. And the validity of AMESim model was ascertained by comparing simulation results of stable pressure before and after valve with calculated values from mathematical models. Then, with the AMESim model, impact characteristics of water-shift pipeline were investigated when adopting various valve switch rules, length of pipelines before and after valve and using an accumulator in system. From that, methods to reduce pipeline impact were proposed, which make good references for noise control of ship pitch balance system.

RNG (Renormalization Group) k-ε turbulent model was applied to the numerical simulation of turbulent mixing processes in the RQL gas turbine combustor, and SIMPLE algorithm was used to solve the finite difference equations. The calculated conclusions were used to analyze temperature distribution of the mixed flow field and near-wall region of the flow field, and then discuss the NOx emissions. The results show that the effect of the injector zone geometry and the jet to crossflow momentum flux ratios on the NOx emissions is obvious. The reasonable control of jet is beneficial to reduce the local high temperature area and is able to improve the distribution of the exit temperature. And then achieve the goal of reducing the environmental pollution.

In high precision three coordinates measuring machine in the process of measurement, dynamic error analysis has been improved measuring machine precision and speed is an important subject. Three coordinate measuring machine structure in the movement of the dynamic deformation of the theoretical points. Due to the servo motor driving force and moving inertia force components will lead to the overall bridge, carriage, upright post and a Z shaft and other components deflect. And through the corresponding theoretical calculation, it is pointed out that the bending deformation of the main structure of the air bearing guide of the components is one of the main causes of the dynamic error. By doing dynamic error experiments, the dynamic errors of CMM body deformation was measured to verify the impact of the body deformation and probe position accuracy, optimize the design of error correction and institutions provide the basis.

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