著者

高木 知弘 福岡 俊道

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.41, no.3, pp.106-114, 2003 (Released:2003-07-24)

参考文献数

17

被引用文献数

2

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In these environmentally sensitive times, bolted flanged joint design that makes the leakage from a joint a design criterion has been investigating. However, achieving uniform bolt preload is difficult when tightening pipe flanges with a number of bolts, even if the appropriate amounts of bolt preload can be calculated following established design rules. A guideline for bolted flange joint assembly has been presented by ASME. However, the guideline needs repeated bolt-up operations to get uniform preloads. In this study, in order to establish a more effective bolt assembly guideline, numerical calculations are systematically executed by using three-dimensional finite element analysis. The analytical objects are pipe flanges of class 150lb and 300lb raised face slip-on welding type specified in JPI with a compressed asbestos sheet gasket inserted. The variations of bolt preload and contact pressure distributions at the gasket bearing surface during bolting up are estimated.

著者

森 敬祐 真壁 朝敏 安藤 新二 井上 晋一

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.58, no.1, pp.14-21, 2020

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Fatigue crack growth tests of rolled magnesium alloy AZ31 were performed with a side-notch plate specimen under negative mean stress conditions. In the results of the present study, even if the experimental conditions were the same, the crack growth behavior varied depending on the condition of the specimen and depending on the microstructure. The local friction between large size and small size crystals and the shear deformation are expected to be related to the crack closure. The crack growth rate was affected by the crack opening stress. When the crack growth rate was lower level, the crack closure behavior worked due to the plastic deformation and the roughness of the fracture surface. There was local rough pattern which work as the shear lip at sides of the crack surface.

著者

奥山 利久

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.38, no.2, pp.106-114, 2000-03-25 (Released:2010-08-05)

参考文献数

8

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High speed vacuum pumping cryopumps for neutral beam injection heating system are presented. Cryo-condensation pumps had been mainly used in large vacuum devices with high gas load and high vacuum operation. However, recently cryosorption pumps with GM cryocooler have been developed for high speed vacuum pump. Cryo-condensation pump is tough to high heat load, on the other hand cryo sorption pump is easy to operate. The features of these two types of cryopump are explained.

著者

佐藤 拓哉

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.43, no.1, pp.40-50, 2005 (Released:2005-03-05)

参考文献数

14

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It is a responsibility for every structural engineer of power plants, refineries, gas plants and chemical plants to design and construct high quality pressure vessels and piping system. To complete this responsibility, it is very important to understand failure modes of pressure vessels, piping and their components, relation between each failure mode and stresses, and design consideration to prevent the failure. In this paper, basic characteristics of each failure mode are described with several examples of failure accident. Typical failure modes described here are a ductile rupture, brittle fracture, excessive deformation, instability (buckling) , progressive deformation (ratcheting) , fatigue fracture, creep rupture, creep ratcheting, creep-fatigue interaction, creep buckling, and environment effect on cracking. For these failure modes, the relation with stresses and design consideration are emphasized.

著者

楠本 韶 伊藤 吉保 宮田 寛 宇佐美 三郎

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.13, no.6, pp.231-238, 1975-11-25 (Released:2010-08-05)

参考文献数

25

著者

庭月野 亨

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.13, no.1, pp.32-38, 1975-01-25 (Released:2010-08-05)

著者

重中 利則

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.34, no.2, pp.83-91, 1996-03-25 (Released:2010-08-05)

参考文献数

5

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Factors regarding the heat recovery steam generator (HRSG) have drastically changed in the development of the gas turbine and needs of a higher thermal efficiency in recent years.In the early 90's, gas turbine firing temperature increased from 1000°C which established in the 70's, to 1300°CAs a result, plant thermal efficiency improved from 40% to around 49% due to increasing the capacity of HRSG and the adoption of higher steam conditions in the reheat/triple-pressure system instead of the conventional non-reheat/single pressure system.Here, subjects of the performance, system, structure and control in reheat/triple-pressure type HRSG are reported.

著者

岡島 智史 岩崎 篤 泉 聡志 酒井 信介

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.43, no.6, pp.335-340, 2005 (Released:2005-12-26)

参考文献数

6

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The verification test of machine diagnosis techniques was carried out by Japan Power Engineering and inspection Corporation, and a system called as the RET (Residual Life Evaluation of Thermal Power Plants) system was developed as the result of this activity. The RET system can evaluate the primary damage of equipments in boiler or turbine using several residual life evaluation methods. The RET system provides valuable function for the residual life evaluation. However, this system is not necessarily utilized widely. In this study, online version of the RET system is developed for the purpose of populization of the RET system. The online RET system can evaluate the primary damage of the equipments in boiler or turbine without any extra application, and is easy to reflect new information.

著者

成瀬 清彦

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.17, no.3, pp.137-142, 1979-05-25 (Released:2010-08-05)

参考文献数

3

著者

中山 卓弥 真壁 朝敏 藤川 正毅 新川 和夫

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.54, no.2, pp.50-59, 2016

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The fatigue limit and crack growth behavior of slit specimens of epoxy base carbon composites were investigated. The fatigue limit was defined by maximum stress amplitude that the specimen endured 106 times stress repeating. Also, that was calculated by net stress at ligament. Carbon fiber directions were parallel and perpendicular to the load axis. The highest value of fatigue limit was obtained when all fiber directions were parallel to the load axis. However, crack grew along the fiber direction or load axis in the case of long slit. In the cases of two carbon directions that is, parallel and perpendicular to the load axis, the fatigue limits were evaluated from the result of the specimen that all carbon directions were parallel to the load axis. When measured value of fatigue limit was higher than the evaluated value, it was expected that the strain constraint occurred due to resistance of fiber in perpendicular to the load axis. When the measured value was lower, the peeling of fiber from epoxy was expected to be occurred. According to those results, it was expected that fatigue limit of smooth specimen of carbon composites with long fiber can be evaluated from the results of slit specimens

著者

中山 卓弥 真壁 朝敏 藤川 正毅 新川 和夫

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.54, no.2, pp.50-59, 2016-03-25 (Released:2016-04-29)

参考文献数

7

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The fatigue limit and crack growth behavior of slit specimens of epoxy base carbon composites were investigated. The fatigue limit was defined by maximum stress amplitude that the specimen endured 106 times stress repeating. Also, that was calculated by net stress at ligament. Carbon fiber directions were parallel and perpendicular to the load axis. The highest value of fatigue limit was obtained when all fiber directions were parallel to the load axis. However, crack grew along the fiber direction or load axis in the case of long slit. In the cases of two carbon directions that is, parallel and perpendicular to the load axis, the fatigue limits were evaluated from the result of the specimen that all carbon directions were parallel to the load axis. When measured value of fatigue limit was higher than the evaluated value, it was expected that the strain constraint occurred due to resistance of fiber in perpendicular to the load axis. When the measured value was lower, the peeling of fiber from epoxy was expected to be occurred. According to those results, it was expected that fatigue limit of smooth specimen of carbon composites with long fiber can be evaluated from the results of slit specimens

著者

戸川 隼人

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.11, no.5, pp.289-296, 1973-09-25 (Released:2010-08-05)

参考文献数

11

著者

Gary Penney

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.49, no.6, pp.281-286, 2011-11-25 (Released:2013-01-18)

著者

辻 裕一 高木 知弘 澤 俊行

出版者

一般社団法人 日本高圧力技術協会

雑誌

圧力技術 (ISSN:03870154)

巻号頁・発行日

vol.42, no.6, pp.337-346, 2004 (Released:2005-01-25)

参考文献数

12

被引用文献数

1

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A guideline for bolted flange joint assembly has been published as an HPIS technical report, in which bolts are tightened in the clockwise-pattern sequence and the tightening torque is 100% of the target torque in all steps except for an install step. This paper describes analytical and experimental backgrounds of the guideline. Numerical simulations of bolt-up procedure by using three-dimensional finite element analysis are systematically executed for JPI flange joints of various nominal sizes and classes. The number of bolt-up passes required to achieve uniform bolt preloads is determined in order to avoid excessive iterations of tightening operation. Tightening tests using various sizes of the flange joint demonstrate that HPIS procedure achieves comparable uniformity in bolt preload and in flange alignment with ASME PCC-1 procedure. The guideline developed is able to achieve accurate preloads consisting with assembly efficiency for practical use.