Pipe Flange Research Articles

255 ガスケット付き管フランジ締結体のボルト締付け管理が漏洩に及ばす影響に関する研究

255 ガスケット付き管フランジ締結体のボルト締付け管理が漏洩に及ばす影響に関する研究

1224 内圧及び曲げモーメントを受けるガスケット付き管フランジ締結体の FEM 応力解析と密封性能

1224 内圧及び曲げモーメントを受けるガスケット付き管フランジ締結体の FEM 応力解析と密封性能

FEM Stress Analyses and a Sealing Performance Evaluation on Pipe Flange Connections with Larger Nominal Diameter Including Spiral Wound Gaskets Under Internal Pressure

FEM Stress Analyses and a Sealing Performance Evaluation on Pipe Flange Connections with Larger Nominal Diameter Including Spiral Wound Gaskets Under Internal Pressure

257 曲げモーメントを受けるガスケット付き管フランジ締結体の FEM 応力解析と密封性能

257 曲げモーメントを受けるガスケット付き管フランジ締結体の FEM 応力解析と密封性能

Effective Bolt-Up Procedure of Pipe Flange Connections. Finite Element Analyses and Elastic Interaction Coefficient Methods.

Effective Bolt-Up Procedure of Pipe Flange Connections. Finite Element Analyses and Elastic Interaction Coefficient Methods.

330 内圧が作用する管フランジ締結体の応力解析と密封性能評価(オーガナイズドセッション : フランジガスケット締結体の力学と密封性能評価2)

330 内圧が作用する管フランジ締結体の応力解析と密封性能評価(オーガナイズドセッション : フランジガスケット締結体の力学と密封性能評価2)

K-0423 内圧を受ける管フランジ締結体の応力解析と密封性能評価(G03-13 接合)(G03 材料力学部門一般講演)

K-0423 内圧を受ける管フランジ締結体の応力解析と密封性能評価(G03-13 接合)(G03 材料力学部門一般講演)

マリンエンジニアリングにおける安全管理に対する計算力学の可能性

The safety management in marine engineering has long been supported with the help of skilled workers. Meanwhile, the lack of such skilled workers is of growing problem in marine engineering field and related areas. Incidentally, Computational Mechanics has attained remarkable progress in this decade, and it is expected to be effective means to solve the problem stated above.In this paper, the tightening procedure of pipe flange connection is adopted, as an example of its engineering application. The most critical problem concerned is the estimation of scatter in bolt preloads, when tightening bolts one by one. Such complicated problem could now be analyzed by FEM. In addition, a numerical method offering an optimal tightening procedure is presented here, which estimates how much initial bolt preload is needed for each bolt to achieve uniform bolt preloads in the final state. The numerical method proposed here is expected to partly compensate the lack of skilled workers and contribute the safety management in marine engineering.

331 曲げモーメントを受ける管フランジ締結体のFEM応力解析(オーガナイズドセッション : フランジガスケット締結体の力学と密封性能評価2)

331 曲げモーメントを受ける管フランジ締結体のFEM応力解析(オーガナイズドセッション : フランジガスケット締結体の力学と密封性能評価2)

322 内圧を受けるガスケット付き管フランジ締結体の応力解析と新ガスケット係数の評価(オーガナイズドセッション : フランジガスケット締結体の力学と密封性能評価1)

322 内圧を受けるガスケット付き管フランジ締結体の応力解析と新ガスケット係数の評価(オーガナイズドセッション : フランジガスケット締結体の力学と密封性能評価1)

131 ガスケット付き管フランジ締結体の応力解析と密封性能評価(GS-3 構造解析・応力解析(3))

131 ガスケット付き管フランジ締結体の応力解析と密封性能評価(GS-3 構造解析・応力解析(3))

Finite Element Simulation of Bolt-Up Process of Pipe Flange Connections

Achieving uniform bolt preload is difficult when tightening a pipe flange with a number of bolts. Several bolt-tightening strategies have been proposed so far for achieving uniform bolt preloads. It seems, however, that effective guidelines for tightening pipe flange connections have not been established. In this study, a numerical approach is presented for estimating the scatter in bolt preloads and achieving the uniform bolt preloads when tightening each bolt one by one in an arbitrary order. Numerical analyses are conducted using three-dimensional FEM as an elastic contact problem. The analytical objects are pipe flanges specified in JIS B 2238 with an aluminum gasket inserted. The validity of the numerical procedures proposed here is ascertained by experiment.

A two-microphone thermoacoustic impedance tube

An experimental arrangement has been developed to explore the thermoacoustic properties of stack materials. The apparatus may be viewed either as a thermoacoustic engine with two microphones mounted in the tube wall, or as a two-microphone impedance tube that accommodates thermoacoustic elements. A sample stack material is placed between two heat exchangers and specific acoustic impedance measurements are taken as a function of frequency and at low-drive amplitude (to avoid nonlinear effects). The design is such that nearly all physical elements and operational parameters can be varied fairly easily. The ‘‘tube’’ is composed of three (flanged) pipe sections of different length, which independently contain a loudspeaker, stack and heat exchangers, and a termination. The test is performed with and without a temperature gradient imposed across the stack. The tube may be pressurized—allowing for different gases held at various ambient pressures—while the relative positioning of the elements within the tube may be varied. Hence a very wide range of testing conditions may be achieved. [Work sponsored by ONR.]

Three-Dimensional Finite Element Analysis of Pipe Flange Connections. (Effects of Solid-Metal Flat Gasket).

Almost all of the latest accidents of pipe flange connection are due to a leakage from gasket bearing surface. Important factors for the leakage problem are considered to be contact pressure distribution and the magnitude of contact area at the gasket bearing surface in service. The previous studies are not necessarily sufficient because of some restrictions involved in numerical analyses. In this study, therefore, the mechanical behaviors of pipe flange connection are evaluated in more detail using FEM as a three-dimensional elastic contact problem. The changes in contact pressure distribution at the gasket bearing surface and bolt axial stress are estimated with increasing inner pressure and bending moment. The analytical objects are pipe flanges specified in JIS B 2238 with solid-metal flat gaskets being inserted. The effects of material properties and thickness of the gasket are also studied. It has been clarified that the contact pressure distributions are different from those reported in the previous papers. The validity of the numerical method is ascertained by experiment.

Evaluations of Bolt-up Process of Pipe Flange Connection Using Finite Element Analysis. In Case of Using Spiral Wound Gasket.

In multi-bolt system, the scatter in bolt tension is largely dependent on the method of tightening operation and elastic interaction due to the successive tightening of bolts. In this study, focuses are placed on effects of elastic interaction and a new bolt-up strategy using three-dimensional finite element analysis, in which a gasket is modeled as a nonlinear one-dimensional gasket element, is proposed. Two types of numerical procedures are presented here. One is to predict the final scatter in bolt tension when tightening all bolts one by one in arbitray order with target preload. The other is to predict the amounts of initial bolt loads needed to create uniform final preloads with one pass operation of bolt tightening. The effectiveness of the numerical approach proposed here is substantiated by comparing numerical results with experimental ones. Contact pressure distributions on the gasket bearing surface, which significantly affect the sealing performance of flange connections, are also evaluated. The objective connection is composed of bolts, pipe flanges and a spiral wound gasket with inner and outer rings.

332 内部熱流体を受ける管フランジ締結体の熱応力解析と密封性能評価(O.S. フランジガスケット締結体の力学と密封性能評価II)(フランジガスケット締結体の力学と密封性能評価)

332 内部熱流体を受ける管フランジ締結体の熱応力解析と密封性能評価(O.S. フランジガスケット締結体の力学と密封性能評価II)(フランジガスケット締結体の力学と密封性能評価)

331 ガスケット付フランジ継手の有限要素解析と漏洩量予測(O.S. フランジガスケット締結体の力学と密封性能評価II)(フランジガスケット締結体の力学と密封性能評価)

331 ガスケット付フランジ継手の有限要素解析と漏洩量予測(O.S. フランジガスケット締結体の力学と密封性能評価II)(フランジガスケット締結体の力学と密封性能評価)

354 管フランジ締結体の三次元有限要素解析(締結体が曲げモーメントを受ける場合)

354 管フランジ締結体の三次元有限要素解析(締結体が曲げモーメントを受ける場合)

324 有限要素解析による管フランジ締結体のボルト締付け指針の検討(O.S. フランジガスケット締結体の力学と密封性能評価I)(フランジガスケット締結体の力学と密封性能評価)

324 有限要素解析による管フランジ締結体のボルト締付け指針の検討(O.S. フランジガスケット締結体の力学と密封性能評価I)(フランジガスケット締結体の力学と密封性能評価)

326 内圧を受ける管フランジ締結体の応力解析と密封性能評価(O.S. フランジガスケット締結体の力学と密封性能評価I)(フランジガスケット締結体の力学と密封性能評価)

326 内圧を受ける管フランジ締結体の応力解析と密封性能評価(O.S. フランジガスケット締結体の力学と密封性能評価I)(フランジガスケット締結体の力学と密封性能評価)