G1010601 Basic Study on Dynamic Reliability of Piping System Supported by Elasto-Plastic Supports with Gaps

In this study, the vibrational behavior of piping systems supported by elasto-plastic dampers with gap supports was considered. First, an analytical model of L-type piping systems subjected to white noise was derived, including the nonlinear characteristics of the elasto-plastic dampers and gap supports. After the stress, energy absorption, and other parameters were calculated for many inputs, the dynamic reliability was calculated based on random theory. Optimization of the support locations was investigated. Finally, the effects of a gap support on the dynamic reliability were investigated.

Download Full-text

Basic study on dynamic reliability of machinery and piping system supported by elasto-plastic supports

Mechanical Engineering Journal ◽

10.1299/mej.16-00722 ◽

2017 ◽

Vol 4 (3) ◽

pp. 16-00722-16-00722

Author(s):

Atsuhiko SHINTANI ◽

Keishi TSUJITA ◽

Tomohiro ITO ◽

Chihiro NAKAGAWA

Keyword(s):

Piping System ◽

Basic Study ◽

Dynamic Reliability

Download Full-text

Simulation of Excessive Deformation of Piping Due to Seismic and Weight Loads

Pressure Vessel and Piping Codes and Standards ◽

10.1115/pvp2002-1254 ◽

2002 ◽

Cited By ~ 1

Author(s):

Tatsuya Fujiwaka ◽

Hiroe Kobayashi ◽

Yasuhide Asada ◽

Chikashi Shitara

Keyword(s):

Effective Means ◽

Bending Moment ◽

Dominant Frequency ◽

General Purpose ◽

Inertia Force ◽

Piping System ◽

Progressive Deformation ◽

Dead Weight ◽

Dynamic Reliability ◽

Asme Code

The ASME Code for seismic design of piping system was revised in 1994 based on evaluation of pipe component test results submitted by the Piping and Fitting Dynamic Reliability Program (PFDRP). PFDRP indicated piping component failure to result in most cases from fatigue with ratchet. Excessive progressive deformation was noted by this program to ultimately occur in test #37, #39 and #40 piping models. This mode of failure was considered due to superposition of bending moment arising from vertical load produced by weight and horizontal seismic inertia force. To clarify the conditions leading to such failure, elastic-plastic dynamic analysis using the general-purpose FEM Code was carried out on the test#37 piping model of PFDRP. The analytical model and method were verified as effective means of study by comparison of analytical results with those obtained experimentally. The parameter determinations were made under condition of variation in dead weight stress and excitation and its dominant frequency. 1994 ASME seismic stress limits were shown effective for preventing excessive progressive deformation in tests #37, #39 and #40.

Download Full-text

A Parametric Study of the Seismic Margins of Piping Components

Pressure Vessel and Piping Codes and Standards ◽

10.1115/pvp2002-1255 ◽

2002 ◽

Author(s):

Wilfred D. Iwan ◽

Ching-Tung Huang

Keyword(s):

Electric Power ◽

Analytical Study ◽

Primary Objective ◽

Electric Power Research Institute ◽

Piping System ◽

Earthquake Excitation ◽

Dynamic Reliability ◽

Frequency Effects ◽

Response Data ◽

Wide Range

This paper presents an analytical study of frequency effects on seismic margins of piping components. The study is based on response data obtained as part of a joint Electric Power Research Institute (EPRI) and NRC Piping and Fitting Dynamic Reliability (PFDR) Program. The majority of the PFDR component tests were performed using a narrow-banded earthquake excitation input that was tuned to have a frequency slightly lower than the fundamental frequency of the test components. However, the natural frequency of a piping system in an actual plant may vary over a wide range. Therefore the seismic margins at off-resonance conditions are of importance. Two seismic margin definitions are examined. The primary objective of this study was to extrapolate the PFDR test margins to other frequency regions and to investigate the effects of various parameter changes on the margins.

Download Full-text

Basic Study on Vibrational Behavior of System Supporting Large-Scale Structures Subjected to Multiple Random Inputs Using Probabilistic Vibration Theory

Volume 8: Seismic Engineering ◽

10.1115/pvp2013-97560 ◽

2013 ◽

Cited By ~ 1

Author(s):

Atsuhiko Shintani ◽

Keishi Tsujita ◽

Tomohiro Ito ◽

Chihiro Nakagawa

Keyword(s):

Large Scale ◽

Supporting Capacity ◽

Basic Study ◽

Random Inputs ◽

Dynamic Reliability ◽

Large Scale Structures ◽

Vibrational Behavior ◽

Vibration Theory ◽

Stress Energy ◽

Scale Structures

In this study, the vibrational behavior of a system supporting large-scale structures that are subjected to multiple random inputs is investigated based on probabilistic vibration theory. The analytical model (FEM) of a system that is subjected to white noise is constructed first. Pipings are assumed to be supported by a nonlinear elastoplastic damper. The vibrational behavior of the structures subjected to multiple random inputs is calculated via numerical simulations. After calculating the stress, energy absorption, etc., the dynamic reliability is calculated based on random theory. Finally, the effects of the supporting location and supporting capacity on the dynamic reliability are investigated.

Download Full-text

M111 Basic Study on Effect of Gaps on Reliability of Piping System Supported by Elasto-Plastic Supports

The Proceedings of Conference of Kansai Branch ◽

10.1299/jsmekansai.2015.90.271 ◽

2015 ◽

Vol 2015.90 (0) ◽

pp. 271

Author(s):

Keishi TSUJITA ◽

Atsuhiko SHINTANI ◽

Tomohiro ITO ◽

Chihiro NAKAGAWA

Keyword(s):

Piping System ◽

Basic Study

Download Full-text

616 Basic Study on the Behavior of Piping System with Gapped Elasto-Plastic Supports

The Proceedings of Conference of Kansai Branch ◽

10.1299/jsmekansai.2014.89._6-16_ ◽

2014 ◽

Vol 2014.89 (0) ◽

pp. _6-16_

Author(s):

Keishi TSUJITA ◽

Atsuhiko SHINTANI ◽

Tomohiro ITO ◽

Chihiro NAKAGAWA

Keyword(s):

Piping System ◽

Basic Study

Download Full-text

Basic Study on Vibrational Behavior of Piping Systems Supported by Elasto-Plastic Damper With Gap Support

Volume 8: Seismic Engineering ◽

10.1115/pvp2014-28283 ◽

2014 ◽

Author(s):

Keishi Tsujita ◽

Atsuhiko Shintani ◽

Tomohiro Ito ◽

Chihiro Nakagawa

Keyword(s):

Numerical Simulation ◽

Analytical Model ◽

Piping System ◽

Response Behavior ◽

Basic Study ◽

Nonlinear Characteristics ◽

Vibrational Behavior ◽

Sinusoidal Input ◽

Piping Systems

In this study, the vibrational behavior of piping systems supported by elasto-plastic dampers with gap supports was considered. First, an analytical model of L-type piping systems subjected to sinusoidal input was derived, including nonlinear characteristics of the elasto-plastic dampers and gap supports. Next, a numerical simulation was performed to verify the effect of the gap support on the piping system. The effect of the input characteristics on the response behavior of the piping system was investigated.

Download Full-text

Basic Study on Pressure Vessel for Vaporization of Cryogenic Fluids by Direct Contacting Normal Temperature Fluids

Volume 4: Fluid-Structure Interaction ◽

10.1115/pvp2012-78192 ◽

2012 ◽

Author(s):

Toshiaki Watanabe ◽

Hironori Maehara ◽

Shigeru Itoh

Keyword(s):

Pressure Vessel ◽

Liquid Fuel ◽

Piping System ◽

Stream Of Consciousness ◽

Basic Study ◽

Cryogenic Fluid ◽

Cryogenic Fluids ◽

Environmental Agreement ◽

Effective Use ◽

Device Technology

In recent years in Japan, the demand of cryogenic fluids like a LH2, LNG is increasing because of the advance of fuel cell device technology, hydrogen of engine, and stream of consciousness for environmental agreement. On the other hand, as for fisheries as well, the use of a source of energy that environment load is small has been being a pressing need. We paid attention to the effective use of cold heat of the liquid fuel which is a cryogenic fluid. That method is to use a cold heat which an cryogenic fluid has, without a heat exchanger. The mixture of the extreme low temperature fluid and the normal temperature fluid becomes the cause which causes pressure vessel and piping system crush due to explosive boiling and rapid freezing. Therefore, we carried out the experiments related to promotion of evaporating cryogenic fluids, in the contact directly of the room temperature fluids and cryogenic fluids.

Download Full-text

Basic Study on Promotion of Evaporating Cryogenic Fluids by Direct Contacting Normal Temperature Fluids

Volume 4: Fluid-Structure Interaction ◽

10.1115/pvp2009-77564 ◽

2009 ◽

Author(s):

Toshiaki Watanabe ◽

Hirofumi Iyama ◽

Hironori Maehara ◽

Shigeru Itoh

Keyword(s):

Fuel Cell ◽

Low Temperature ◽

The Other ◽

Piping System ◽

Rapid Freezing ◽

Stream Of Consciousness ◽

Basic Study ◽

Cryogenic Fluids ◽

Environmental Agreement ◽

Device Technology

The mixture of the extreme low temperature fluid and the normal temperature fluid becomes the cause which causes pressure vessel and piping system crush due to explosive boiling and rapid freezing. In recent years in Japan, the demand of cryogenic fluids like a LH2, LNG is increasing because of the advance of fuel cell device technology, hydrogen of engine, and stream of consciousness for environmental agreement. On the other hand, as for fisheries as well, the use of a source of energy that environment load is small has been being a pressing need. Therefore, we carried out the experiments related to promotion of evaporating cryogenic fluids, in the contact directly of the water and liquid nitrogen.

Download Full-text