Hangzhou Special Equipment Inspection Institute

Hangzhou, China

Hangzhou Special Equipment Inspection Institute

Hangzhou, China
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Li W.W.,Hangzhou Administration of Quality Control Supervision | Du Q.,Hangzhou Special Equipment Inspection Institute | Li W.Z.,Hangzhou Special Equipment Inspection Institute
Advanced Materials Research | Year: 2014

The existing researches only put forward the stress concentration portion and design improvements from the perspective of stress analysis, or conducts safety assessment on dryers with the methodology of fracture mechanics, without non-destructive testing methods. Based on over 3,400 tests on cast iron dryers in Hangzhou, an ultrasonic testing technology with longitudinal wave double crystal probe is developed in the present investigation. This study illustrates how to identify the volume defects through testing on the air holes, shrinkage cavities and inclusions in the dryer cylinder and small R transition zone with longitudinal wave double crystal probe at a small angle (5°), as well as plane defects with deep cracks through testing on the dryer cylinder and small R transition zone with longitudinal wave double crystal probe at a large angle (42°). It addresses the issues of how to measure the thickness in regular online testing for cast iron dryers, to calculate the intensity or compare with the design value, to identify low hardness value, to determine the key parts in online testing, and how to conduct safety assessment on the cast iron dryers with small cracks. This technique may resolve various problems in cast iron dryer testing. © (2014) Trans Tech Publications, Switzerland.

Li W.W.,Hangzhou Administration of Quality Control Supervision | Ye Q.,Hangzhou Special Equipment Inspection Institute | He C.D.,Hangzhou Special Equipment Inspection Institute
Applied Mechanics and Materials | Year: 2014

This article provides a comprehensive post hoc analysis on the explosion of horizontal cold-chamber accumulator occurred in a company in Hangzhou in May 2014, which is considered as a pressure vessel explosion accident, but not a special equipment accident, and is thus determined as a production safety accident. Based on detailed analysis of working principle of horizontal cold-chamber die-casting machine, the article puts emphasis on working principle of bladder accumulator and deduces two possible causes of accident through thickness measurement, metallographic test, explosion energy estimation and mechanical test on the faulty accumulator. On the basis of accident analysis, the article presents that great importance should be attached to the safety in inflation of accumulator of die casting machine, to prevent similar accidents from happening again by improving the operation system. © (2014) Trans Tech Publications, Switzerland.

Li W.W.,Hangzhou Administration of Quality Control Supervision | Li W.Z.,Hangzhou Special Equipment Inspection Institute | Du Q.,Hangzhou Special Equipment Inspection Institute
Applied Mechanics and Materials | Year: 2013

The atmosphere&vacuum-catalytic cracking integrated unit of a petrochemical enterprise in Hangzhou can not be tested for continuously producing 35 sets of pressure vessels. This thesis assesses the three main parameters (probability of failure, failure result and risk of failure probability and result) of the system through FBI technology, analyzes the potential failure mode and probability in this system and confirms the risk of failure via calculating failure result. This thesis shows the testing strategy suitable for this device based on failure mode, failure probability and result and puts forward scientific and proper testing cycle based on risk level of equipment to ensure the depth and rationality of overdue testing work and improve the reliability of safe and stable operation of device for the system before the next maintenance cycle. © (2013) Trans Tech Publications, Switzerland.

Wang L.,Zhejiang University of Technology | Wang L.,Hangzhou Special Equipment Inspection Institute | Xiong X.F.,Zhejiang Bohua Environmental Technology and Engineering Co. | Fan Z.,Zhejiang University of Technology | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

The nanofiltration(NF) membrane technology presented in this paper were used to treat the industrial electroplating effluent for reutilization, which contained hazardous heavy metal ions such as chromium and zinc. Two different kinds of nanofiltration membranes were applied in pilot scale installation following the conventional wastewater treatment system. The effects of different operating parameters on their separation performance were investigated in detail. Results showed that both two NF membranes held large permeate flux under relatively low operating pressures. The rejection rates of the monovalent ions were less than 50%, while for divalent ions they were more than 90%, including SO4 2-, Ca2+, Cr3+ and Zn2+. Higher permeate flux, lower operating pressure and distinguished ion selectivity of nanofiltration membranes exhibited a big potential for industrial application concerning the investment and operation cost. © (2013) Trans Tech Publications, Switzerland.

Liu P.F.,Zhejiang University | Xing L.J.,Zhejiang University | Liu Y.L.,Hangzhou Special Equipment Inspection Institute | Zheng J.Y.,Zhejiang University
Journal of Failure Analysis and Prevention | Year: 2014

As special equipment for material hoisting and carrying, the double-trolley overhead traveling crane develops rapidly in the field of mechanical engineering. In order to improve the safety, reliability, and economy, the lightweight design for the crane is crucial, which mainly contains two important fundamental works: one is the prediction of the limit load-bearing ability and the other one is the optimization. In this paper, a three-dimensional parametric finite element model is established and the limit load-bearing ability of the main girder of a true crane is predicted using the arc-length algorithm and nonlinear stabilization algorithm, respectively. Finite element analysis indicates the existing double-trolley overhead traveling crane shows a large strength allowance. The subsequent optimal design which aims to achieve a perfect match between the mechanical performance and weight is conducted based on the strength analysis. Specially, the software platform of optimal design for double-trolley overhead traveling crane is developed to reach the integrated parametric design interactively. The proposed numerical methods which are highlighted by an optimal design platform implement the lightweight design conception efficiently. By numerical analysis, this research is demonstrated to provide theoretical and technical support for promoting the lightweight design and safety evaluation of cranes. © 2013 ASM International.

Liu P.F.,Zhejiang University | Chu J.K.,Zhejiang University | Liu Y.L.,Zhejiang University | Liu Y.L.,Hangzhou Special Equipment Inspection Institute | Zheng J.Y.,Zhejiang University
Materials and Design | Year: 2012

The complex failure mechanisms that are commonly considered as the distinctive characteristic of composites are being amenable to nondestructive test advance. This research adopts the acoustic emission technique to study the failure mechanisms and damage evolution of carbon fiber/epoxy composite laminates. Effects of different lay-up patterns and hole sizes on the acoustic emission response are studied to set up the mapping between the failure properties and the acoustic signal features such as the energy, counting and amplitude. Moreover, the microscopic properties of different composite specimens after fracture are watched and analyzed by scanning electron microscope (SEM). Based on the mapping conception, the controlling microscopic failure mechanisms of composites including the splitting matrix cracking, fiber/matrix interface debonding, fiber pull-out and breakage as well as delamination are identified. It is expected the influence of complex lay-up patterns and sizes on the damage and failure properties of composites is represented by creating true mapping based on the acoustic emission technique. © 2011 Elsevier Ltd.

Xia F.-Y.,Hangzhou Special Equipment Inspection Institute | Li W.-Z.,Hangzhou Special Equipment Inspection Institute | Liu Y.-L.,Hangzhou Special Equipment Inspection Institute
Applied Mechanics and Materials | Year: 2013

Due to the advantages of corrosion resistance, no scaling, light weight, polyethylene pipes are widely used in low pressure gas networks and their safety has also been duly noted. As for heat fusion welding of PE pipeline connectors, there is no effective means of detection internally. In this paper, welding specimens were tested under the condition of normal conditions, low melting temperature, low pressure, low heating time melts, underwater welding by the United States imported equipment based on the echo pulse method of ultrasonic testing technology. Comparing with the results of related conditions of tensile tests, this paper found that ultrasound can effectively identify internal defects of hot-melt connectors. And there is a corresponding relationship between the ultrasonic system evaluation grades and the elongation at break, the higher the level, the lower the elongation at break. Related research results can provide the basis for the establishment of PE pipe ultrasonic non-destructive testing inspection standards. © (2013) Trans Tech Publications, Switzerland.

Zhao Y.,Zhejiang University | Liu G.,Zhejiang University | Liu Y.,Hangzhou Special Equipment Inspection Institute | Zheng J.,Zhejiang University | And 4 more authors.
International Journal of Hydrogen Energy | Year: 2012

There will be significant temperature rise within hydrogen vehicle cylinder during the fast filling process. The temperature rise should be controlled under the temperature limit (85 °C) of the structure material (set by ISO/TS 15869), because it may lead to the failure of the structure. In this paper, a 2-dimensional axisymmetric computational fluid dynamics (CFD) model for fast filling of 70 MPa hydrogen vehicle cylinder is presented. The numerical simulations are based on the modified standard k - ε turbulence model. In addition, both the equation of state for hydrogen gas and the thermodynamic properties are calculated by National Institute of Standards and Technology (NIST) database: REFPROP 7.0. The thermodynamic responses of fast filling with different pressure-rise patterns and filling times within type III cylinder have been analyzed in detail. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights.

Zhu S.,Zhejiang University | Chen Q.,Zhejiang University | Wang X.,Zhejiang University | Liu S.,Hangzhou Special Equipment Inspection Institute
International Journal of Robotics and Automation | Year: 2016

This paper presents a novel method towards the dynamic modelling of serial robot by combining screw theory and Kane's equations, which can simplify the dynamic analysis of the system, reduce the workload of calculation and make the process smooth. The kinematic pair screw and body Jacobian of rigid body have been introduced. Then a novel partial velocity and partial velocity twist matrix according to screw theory are given respectively. In the following, the Kane's dynamic equations based on screw theory of serial robot have been deduced. To verify the convenience of the proposed method, an example of the dynamic modelling is illustrated. After that, a nonlinear robust sliding mode controller is designed to promote the tracking performance with considering system uncertainties and modelling errors. To enlarge the small error and avoid the accumulation of large error, a new nonlinear integral slide surface is proposed, along with a saturation function instead of switch function to eliminate the chattering. Then the stability analysis of the proposed sliding mode controller for the system is performed by using Lyapunov stability theory. Finally, comparative experiments are given to demonstrate the effectiveness and robustness of the proposed approach.

Chen T.,Hangzhou Special Equipment Inspection Institute | Li S.R.,Hangzhou Special Equipment Inspection Institute | Li W.Z.,Hangzhou Special Equipment Inspection Institute | Liu Y.L.,Hangzhou Special Equipment Inspection Institute | And 2 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2013

As a kind of general equipment for fluid transportation, pumps were widely used in industry which includes many applications of high pressure, temperature and toxic fluids transportations. Performances of pumps affect the safety and reliability of the whole special equipment system. Cavitation in pumps cause the loss of performance and erosion of the blade, which could affect the running stability and reliability of the pump system. In this paper, a kind of numerical method for cavitaion performance prediction was presented. In order to investigate the accuracy of the method, CFD flow analysis and cavitation performance predictions of a mixed-flow pump were carried out. The numerical results were compared with the test results. © Published under licence by IOP Publishing Ltd.

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