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Piping, Valves and Actuator Offshore Coating Case Studies
Published in Karan Sotoodeh, Coating Application for Piping, Valves and Actuators in Offshore Oil and Gas Industry, 2023
Low-alloy HDG bolting is widely used for valves, flanges, hubs and clamps in the oil and gas industry, particularly topside offshore. Many low-alloy steel HDG bolts and nuts are used for industrial valves in exotic materials such as duplex, super duplex and 6MO. However, if the HDG is removed from the bolts and nuts, the underlying, non-corrosion-resistant alloy (low-alloy steel) will be corroded after some years of operation. If such bolting is used for valves in exotic materials such as duplex and super duplex, then the valve will be useless after the corrosion of the bolting and will have to be thrown out. Merely screwing or unscrewing the bolts inside the nuts causes metal-to-metal contact and friction between the threaded areas of the bolts and nuts, and the HDG can be removed by these actions even in a short period of time. Figure 6.19 illustrates the removal of HDG from the low-alloy steel nut material installed on a mechanical joint.
Single-Manipulator Testing Technique
Published in Chunguang Xu, Robotic Nondestructive Testing Technology, 2022
To meet the needs of automatic testing, automatic clamping devices (such as those for the ultrasonic transducer and specimen) can also be added into the testing system. For the complex components such as aero-engine blades, a set of tools applying to all the tested components is hard to design due to the difference in component curvature. Therefore, this system provides a device connected with both the manipulator end flange and the angular displacement table. In addition, a special fixture can be designed according to the blade rabbet structure to realize the connection and alignment with manipulator. In addition to mechanical joint elements, auxiliary equipment such as water tank, water circulation system and manipulator load-bearing platform should also be built according to the requirements of different detection methods in the experiment.
Numerical analysis of mechanical joint in thin-walled composite structures
Published in Wojciech Pietraszkiewicz, Wojciech Witkowski, Shell Structures: Theory and Applications Volume 4, 2017
K. Puchała, E. Szymczyk, J. Jachimowicz
The development of a mechanical metal-composite joint is presented in (Puchała et al. 2015). The assumed composite laminate lay-up provides its thickness about 3.1 mm. The remaining dimensions were calculated according to typical mechanical joint conditions (which require the absence of plastic strains within the limit load range in service): bearing, net-tension and a bolt shear condition. Comparison of all the aforementioned strength conditions (assuming that the value of the lowest failure force corresponds to bearing of the composite part) results in aluminium sheet (outer element of double lap joint) thickness of 2 mm. For the selected pitch 5d, the values of bearing and tensile strengths of the composite element are comparable. Additionally, the bearing by-pass diagram shows that there is a possibility of failure of a composite part in the net-tension mode. Therefore, the joint width was increased to 70 mm. For such dimensions, the composite part of the joint should fail in the bearing mode (Puchała et al. 2015). The developed specimen is analysed in the paper.
Functional characterisation of mechanical joints to facilitate its selection during the design of open architecture products
Published in International Journal of Production Research, 2018
Jaime A. Mesa, Danny Illera, Iván Esparragoza, Heriberto Maury, Humberto Gómez
A mechanical joint may be defined as a system intended to restrain the relative degrees of freedom between components (or modules) with the purpose of providing positioning or establishing a mechanical energy transfer path. Mechanical joints define the relationship among the components that comprise a product and enable the connection and coupling of the product with other products or components to develop different functionalities. According to the literature review, the approaches existing regarding mechanical joint selection and design are insufficient. Most of the information available is merely descriptive, and it is focused on defining the types of mechanical joints, as well as its main features and some technical attributes for its selection. However, the majority of existing methods for the selection of joining systems are limited and do not consider a rigorous comparison of functional attributes that guarantee a robust decision-making process that does not implies further difficulties in posterior stages of the product life cycle.