Examination of Laminations in the Base Material on a Section of High Pressure Gas Supply Pipeline

The proliferation of gas-fired cogeneration plants in recent years had led to many installations being located on sites remote from high-pressure gas pipelines. Since it is often impractical or not cost effective to provide a dedicated high-pressure gas supply, such installations are often based close to alternative sources of fuel, such as small natural gas wells, landfill sites, or sewage digester plants. This paper will look at typical gas sources and composition, requirements of the fired equipment, the types of fuel gas compressors normally used, methods of compressor capacity control, and the development of synthetic and semi-synthetic lubricants for fuel gas compression duty.

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Fatigue Capacity of Wellhead Housings

Volume 3B: Structures, Safety and Reliability ◽

10.1115/omae2017-61421 ◽

2017 ◽

Cited By ~ 1

Author(s):

Sergey Kuzmichev ◽

Javier Rodriguez Garcia ◽

Kristoffer H. Aronsen ◽

Guttorm Grytøyr ◽

Finn Kirkemo ◽

...

Keyword(s):

High Pressure ◽

Boundary Conditions ◽

Base Material ◽

Low Pressure ◽

Cross Sectional ◽

Applied Loading ◽

Load Paths ◽

Calculated Load ◽

Stress Curve ◽

Sensitivity Studies

The issue of wellhead fatigue has been given significant attention during recent years. The complexity of the wellhead system in terms of interactions betwe[en conductor (low pressure) and wellhead (high pressure) housings leads to various analysis methods being proposed to evaluate fatigue damage in the system. Most of the critical base material hotspots are located in the wellhead housing region where the loads start to distribute between the high- and low pressure housing and the load paths are highly complex varying for different input parameters. Due to this, detailed fatigue analyses are typically performed on a project to project basis for the same wellhead geometry. This paper proposes an approach that simplifies the analysis of the base material hotspots in the housings and makes it independent of where the specific type of the wellhead system is used. It is suggested to consider the housings of the wellhead system as one component with a single characteristic M-N curve, or a few M-N curves if complexity requires so. The M-N curve is a specialization of the standard S-N curves provided in rules and standards. They are generated by combining the calculated load-to-stress curve at a given hotspot with the applicable S-N curve. The load used as a reference is typically a cross-sectional moment at the top of high pressure housing. For these purposes 3D FE models have been developed for two principal wellhead types, rigid lock and non-rigid lock. The models are used to investigate the effect of different boundary conditions and applied loading on M-N curves for each hotspot analysed. Sensitivity studies have been performed for several parameters that are considered important in wellhead fatigue analysis. Based on the sensitivity studies, the effect of each parameter on typical base material hotspots is presented. This paper provides estimates for the spread in the M-N curves for each individual base material hotspot in the wellhead housings. Results indicate that a single characteristic M-N curve per wellhead system type can be selected to represent the wellhead housings. In addition, based on results from the analyses carried out, recommendations regarding generalized boundary conditions to obtain a characteristic M-N curve for a specific wellhead type have been given.

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Ships and marine technology � Performance test procedures for high-pressure pumps in LNG fuel gas supply systems (FGSS) for ships

10.3403/30360833u ◽

2021 ◽

Keyword(s):

High Pressure ◽

Performance Test ◽

Test Procedures ◽

Fuel Gas ◽

Marine Technology ◽

Lng Fuel ◽

Supply Systems ◽

Gas Supply

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Dynamic Simulation and Experimental Research of High Pressure Pneumatic Valve in Gas-Driven Light Gas Gun

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.365-366.289 ◽

2013 ◽

Vol 365-366 ◽

pp. 289-293

Author(s):

Yang Liu ◽

Xiao Dong Song ◽

Xiao Xian Yao ◽

Kun Li

Keyword(s):

High Pressure ◽

Delay Time ◽

Experimental Tests ◽

Response Characteristic ◽

Test Bed ◽

Supply Circuit ◽

Electromagnetic Valve ◽

Pneumatic Valve ◽

Gas Gun ◽

Gas Supply

Use gas-driven light gas gun is one of the techniques extensively used to achieve hypervelocity projectiles. The device was made up of a compressed gas gun as the first-stage drive. A new type high pressure pneumatic injecting system of gas-driven light gas gun for hypervelocity launching is introduced. As a critical component of the injecting system, the high pressure pneumatic valve was designed. Functions of the pneumatic valve were preserved and relevant techniques were discussed. Besides, a high pressure pneumatic mass flow control test-bed using inert medium was built in order to study the dynamic response characteristic of high pressure pneumatic valve in gas-driven light gas gun. To ascertain the response delay time of the valve, several turn-on and turn-off experimental tests of the valve were initiated. The results suggest that: the pressure of pneumatic electromagnetic valve gas supply circuit seriously influenced the properties of high pressure pneumatic valve; the mean delay time of the high pressure pneumatic valve was 190ms approximately at 6.5MPa gas pressure of the pneumatic electromagnetic valve gas supply circuit.

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Manufacture of Advanced 2.25Cr-1Mo-V Pressure Vessel Steel for High Pressure and High Temperature Hydrogen Service

Storage Tank Integrity and Materials Evaluation ◽

10.1115/pvp2004-3064 ◽

2004 ◽

Author(s):

T. Hasegawa ◽

A. Narita ◽

H. Iga ◽

S. Inoue

Keyword(s):

High Pressure ◽

High Temperature ◽

Pressure Vessel ◽

Base Material ◽

Postweld Heat Treatment ◽

Pressure Vessels ◽

Pressure Vessel Steel ◽

Vessel Steel ◽

Manufacturing Technologies ◽

Welding Consumables

At this moment, the materials which are applied for high pressure and high temperature services are selected from conventional 2.25Cr-1Mo, 3Cr-1Mo-V and 2.25Cr-1Mo-V steels. Especially, the application of 2.25Cr-1Mo-V steel is increased extremely rather than the other steels in order to take the advantage of higher strength and better resistance to hydrogen damages such as hydrogen attack, hydrogen assisted crack growth and also hydrogen induced disbonding. In order to achieve these properties, the vanadium element is added intentionally into base material and welding consumables. Due to the addition of vanadium, the engineer have recognized that there is some possibility of cracking in the weldment due to the higher hardness and insufficient manufacturing practices caused by lack of knowledge for preheating, intermediate/final postweld heat treatment and other factors. The manufacturers have to establish the proper technologies to avoid this problem during fabrication stage while the pressure vessels are to be fabricated in their shop and/or fields. In this paper, the manufacturing technologies of 2.25Cr-1Mo-V steel pressure vessel through actual fabrication is presented herewith.

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