Repair Technology for Single Deck Distortion of Floating Roof Tank

2008 ◽  
Author(s):  
Hongli Pan ◽  
Ping He ◽  
Guangzhong Liu
Keyword(s):  
Local Stress ◽  
Construction Process ◽  
Nondestructive Examination ◽  
Technical Requirements ◽  
Assembly Method ◽  
Small Distortion ◽  
Transverse Welds ◽  
Welding Procedure ◽  
Longitudinal Welds ◽  
Sequential Assembly

The repair welding procedure and assembly method that is considered as the key of repair single deck distortion are pointed out in this paper. Also presented is the repair plan of single deck distortion which consists of four stages: stress release, distortion repair, stress adjusting, and sequential assembly. The steps and technical requirements of repair single deck distortion are as follows: Step 1: Installing repairing platform — The platform should have enough stiffness, or else it will influence the repair effect of single deck distortion. Step 2: Inspecting the stress and distortion of single deck plates — The intention of inspecting the stress and distortion of single deck plates is in order to select the welds which should be retained or removed, and to confirm the sequence of removing the welds. The method of lattice is applied in inspection. Step 3: Removing single deck plates — The principle of removing single deck plates is to remove longitudinal welds and adjust the longitudinal distortion of single deck plates first, then removing transverse welds and adjust the transverse distortion of single deck plates. Step 4: Eliminating the local stress of single deck — The key of eliminating local stress of single deck is to control the skill of releveling the single deck plates, assembly of shaped single deck plates, dot welding of single deck plates and inspecting the distortion of the single deck plates. Step 5: Eliminating the integral stress of single deck — The single deck is divided into nine parts. Small distortion of single deck is eliminated first, then the serious distortion. Step 6: Adjusting the distortion of assembled single deck plates — Adjusting the distortion of assembled single deck is a very important process for single deck repair. The adjusting method is from integral to local and then from local to integral of single deck repeatedly. Step 7: Welding single deck plates — The step is to weld short welds first, then long welds. From the center to all sides of single deck, the method of skip welding is applied. Step 8: Nondestructive examination — All welds should be examined in accordance with relevant standards. This technology can eliminate 98% of single deck distortion, which can eliminate the sinking risk of floating roof. The technical requirements of construction process developed in this paper can also be used to instruct the construction of the new floating roof tank’s single deck. The construction process helps to reduce the initial distortion of single deck.

scholarly journals Existing problems and measures in safety management of chemical engineering

2018 ◽  
Author(s):  
Yuepeng Liu ◽  
Zhigang Zhang ◽  
Quan Yang ◽  
Qiang Zhang ◽  
Zhen’an Liu
Keyword(s):  
Economic Development ◽  
Chemical Industry ◽  
Chemical Engineering ◽  
Safety Management ◽  
Pollution Prevention ◽  
Construction Process ◽  
Technical Problems ◽  
Engineering Construction ◽  
Technical Requirements ◽  
Management Personnel

For a country, the industry is a very important system, the embodiment of the country's comprehensive national strength, the country's economic development level and the development of science and technology level has direct impact on industry. The development of chemical industry also has great impetus to the national economic development. The technical requirements for chemical engineering are particularly high. Because of the danger of the chemical itself, safety becomes the first thing to notice in the construction process. In order to prevent the occurrence of danger in the actual construction process, the safety of chemical engineering construction is made, and the effective safety management is the most critical step. A reliable safety management is the guarantee for the smooth construction of the construction, so the early safety management becomes the key to the development of the chemical industry. Chemical engineering is an extremely complex and changeable system, and the kinds of problems involved are very many, which requires the construction personnel to pay more attention to ensure the safety. In order to implement the safety management measures in the process of chemical engineering construction, it is necessary for the management personnel to strictly control the whole construction process. In case of any problem, we should deal with it in a timely manner and pay more attention to the details. We should pay attention to fire prevention, pollution prevention and anti-explosion prevention. Technical personnel should pay more attention to technical problems and eliminate safety hazards. The construction company must also strengthen the personal quality of the project management personnel and other issues. It is necessary to examine personal responsibility and safety awareness and avoid unnecessary losses caused by various construction safety issues to the company[1].

BEHAVIORS OF SLIP-CRITICAL BOLTS IN COMBINATION WITH FILLET WELDS

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Heui-Yung Chang ◽  
Ching-Yu Yeh ◽  
Chia-Yu Chen
Keyword(s):  
Structural Steel ◽  
Fracture Strength ◽  
Fillet Welds ◽  
Strength Ratio ◽  
Steel Buildings ◽  
Bearing Strength ◽  
Fracture Surfaces ◽  
Weld Material ◽  
Transverse Welds ◽  
Longitudinal Welds

According to the Specification for Structural Steel Buildings (AISC 2010), slip-critical bolts can only share load with longitudinal welds in a joint. Moreover, the bolt available strength shall not be taken greater than 50% of the bearing-type. This paper presents the result of a series of joint tests verifying the specification. The joints were tested in a manner similar to previous work (e.g. Manuel and Kulak 2000). The slip strength values of JIS F10T and F14T bolts were tested and compared. Transverse and longitudinal fillet welds with a leg size of 12 mm and the same amount of weld material were adopted and tested respectively. The strength ratio between bolts and welds changes from 5/8 to 6/9 in the combination joints. The result shows that in the combination with longitudinal welds, the bolts tend to slip and contact the plates, developing greater bearing strength. In the combination with transverse welds, the bolts slip and the pretension decreases greatly. But the combination also causes the fracture surfaces of transverse welds to change, providing additional strength to compensate the decrease in bolt slip strength. The combination joints therefore can develop strength greater than the sum of slip strength and fracture strength.

scholarly journals ASSESSMENT OF KNOWLEDGE AND AWARENESS REGARDING MRT OF NBC; A CASE OF TILOTTAMA MUNICIPALITY, NEPAL

2020 ◽  
Vol 8 (7) ◽  
pp. 50-66
Author(s):  
Sandeep Regmi ◽  
Anjay Mishra
Keyword(s):  
Sampling Method ◽  
Total Population ◽  
Tracking System ◽  
Building Code ◽  
Construction Process ◽  
Building Permits ◽  
Technical Requirements ◽  
Earthquake Resistant Design ◽  
Earthquake Resistant ◽  
Private Housing

The study was carried out to analyze the compliance status of NBC and Byelaws in private housing construction of Tilottama Municipality. The permitted building samples with all necessary documents is taken for research purpose to trace the compliance status of National Building Code and Byelaws in construction of private housing. Field verification and review of approved drawings and building permits of 51 numbers of households from the total population of 323are selected by purposive sampling method to check the compliance status of NBC and Byelaws provisions. The samples are taken from both ProfessionallyEngineeredBuildingsandMandatoryruleofthumb-(NBC205) buildings constructed in the Tilottama Municipality. From the study, it is found that after the earthquake concerned stakeholders possess good knowledge of earthquake and its consequences. Knowledge regarding the earthquake resistant design and construction process is found fairly adequate. The perspective of concerned stakeholders towards building code and byelaws are positive. Out of 51 households surveyed, only 7 of the buildings have not complied with all the technical requirements of NBC whereas the building byelaws provisions are found to be effectively implemented by 44 buildings. The adopted process and existing mechanism for the implementation of building code and byelaws by the municipality is not effective as the tracking system of building permit process is ineffective.

scholarly journals Construction Process Technical Impact Factors on Degradation of the External Thermal Insulation Composite System

2018 ◽  
Vol 10 (11) ◽  
pp. 3900 ◽  
Author(s):  
Virgo Sulakatko ◽  
Frank Vogdt
Keyword(s):  
Thermal Insulation ◽  
Composite System ◽  
Evaluation Model ◽  
Impact Factors ◽  
Mechanical Resistance ◽  
Construction Process ◽  
Mode Effects ◽  
Technical Requirements ◽  
Friedman's Test ◽  
The Impact

The European climate strategy has encouraged the usage of the External Thermal Insulation Composite System (ETICS) to increase the energy efficiency of external building envelopes. This externally and relatively easily applicable façade solution must meet various technical requirements. This paper develops a technical severity evaluation model of on-site construction activities of ETICS to prioritize the risks of the construction process. The model can be used independently by any stakeholder of the construction process. The relevance of the activities is assessed with the Failure Mode Effects Analysis method. The model weights the impact of the essential technical requirements and simulates an integrated weighted technical severity value, which is derived from the analysis of experts’ judgments validated with the non-parametric Friedman’s test. The data collection for probability of occurrence and difficulty of detectability follows the Delphi technique to quantify the opinions of a group. The simulation, conducted on 103 degradation factors, shows that the on-site construction activities of ETICS strongly influence the decrease in the technical resilience of long-term durability, mechanical resistance, and stability, as well as the ability to bypass tensions. The highest risk is detected by the shortcomings in the layers of substrate, reinforcement, adhesive, and additional details.

Analysis for the Large Precise Equipment Assembly

2014 ◽  
Vol 670-671 ◽  
pp. 915-919
Author(s):  
Wei Jiang ◽  
Yan Ling Han ◽  
Wei Dong ◽  
Qiang Zhou
Keyword(s):  
New Method ◽  
Construction Process ◽  
Real Situation ◽  
Assembly Method ◽  
The Cost ◽  
Very High

In industrial and construction process, some precise equipments should be assembled on site. The assembly requirement is very high, and it is hard to assemble the accessories together. The paper is based on a real situation in construction to study the precise equipment assembly method. First, it introduces the situation on site and the parameter of the parts of equipment need to be assembled. Then show the cost for the traditional assembly method. Put forward a new method to do the work. At last, compare the advantage and disadvantage of the two methods. The new method mentioned in the paper will greatly improve the installation efficiency in the construction.

Quality Control Measures of the 400-Meter Standard Runway Plastic Surface

2013 ◽  
Vol 312 ◽  
pp. 1001-1005
Author(s):  
Li Jun Yin
Keyword(s):  
Quality Control ◽  
Control Measures ◽  
Engineering Practice ◽  
Direct Impact ◽  
Construction Process ◽  
Important Process ◽  
Technical Requirements ◽  
Plastic Surface ◽  
Surface Construction

The 400-meter standard plastic runway construction included the construction of multiple itemized construction process, the plastic surface is a very important process, and its quality has a direct impact on the use of performance. This paper combined engineering practice, and focuses on the construction process and the technical requirements of the plastic surface, summed up in the plastic surface construction quality control measures to guarantee the whole quality of the plastic surface.

scholarly journals ASSESSING THE INFLUENCE OF ON-SITE LIGHTING CONDITIONS TO THE POTENTIAL VARIABILITY OF THE 360 ° PHOTOGRAMMETRY USABILITY

2021 ◽  
Vol 6 (2) ◽  
pp. 41-50
Author(s):  
Tomas Funtik ◽  
Pavol Mayer
Keyword(s):  
Digital Camera ◽  
Effective Control ◽  
Construction Site ◽  
Construction Process ◽  
Artificial Lighting ◽  
Lighting Conditions ◽  
Technical Requirements ◽  
Efficient Data ◽  
The Impact

Today's technologies enable efficient data management and generally contribute to effective control of the construction process. There are various ways of focusing on a real construction project based on laser or digital camera measurements, however, the quality of outputs is depending on the lighting conditions. Proper lighting conditions greatly affect the result of the processed record, especially its final texture, geometry, and affect any errors in the measured values. There are various lighting conditions on the construction site, which affect the quality of the documentation made. While in the outdoor parts this situation is affected by daylight, inside the building we must rely on artificial lighting and as a result there are many parts without sufficient lighting, or the lighting is completely absent.In this article we focus on the evaluation of the impact of lighting in documenting the course of work on the site using 360 ° photogrammetry, especially in relation to verification of geometric accuracy, position of structures and current work in progress and follows the analysis of standard and technical requirements to determine appropriate ways to ensure adequate lighting.

scholarly journals Existing problems and measures in safety management of chemical engineering

2018 ◽  
Vol 2 (3) ◽  
Author(s):  
Yuepeng Liu ◽  
Zhigang Zhang ◽  
Quan Yang ◽  
Qiang Zhang ◽  
Zhen’an Liu
Keyword(s):  
Economic Development ◽  
Chemical Industry ◽  
Chemical Engineering ◽  
Safety Management ◽  
Pollution Prevention ◽  
Construction Process ◽  
Technical Problems ◽  
Engineering Construction ◽  
Technical Requirements ◽  
Management Personnel

For a country, the industry is a very important system, the embodiment of the country's comprehensive national strength, the country's economic development level and the development of science and technology level has direct impact on industry. The development of chemical industry also has great impetus to the national economic development. The technical requirements for chemical engineering are particularly high. Because of the danger of the chemical itself, safety becomes the first thing to notice in the construction process. In order to prevent the occurrence of danger in the actual construction process, the safety of chemical engineering construction is made, and the effective safety management is the most critical step. A reliable safety management is the guarantee for the smooth construction of the construction, so the early safety management becomes the key to the development of the chemical industry. Chemical engineering is an extremely complex and changeable system, and the kinds of problems involved are very many, which requires the construction personnel to pay more attention to ensure the safety. In order to implement the safety management measures in the process of chemical engineering construction, it is necessary for the management personnel to strictly control the whole construction process. In case of any problem, we should deal with it in a timely manner and pay more attention to the details. We should pay attention to fire prevention, pollution prevention and anti-explosion prevention. Technical personnel should pay more attention to technical problems and eliminate safety hazards. The construction company must also strengthen the personal quality of the project management personnel and other issues. It is necessary to examine personal responsibility and safety awareness and avoid unnecessary losses caused by various construction safety issues to the company[1].

Introduction to KEPIC (Korea Electric Power Industry Code)

2013 ◽  
Author(s):  
Myoung-Sung Sohn ◽  
Hyun-Jae Joo ◽  
Hoon-Seok Byun ◽  
Jong-Hae Kim
Keyword(s):  
Electric Power ◽  
Nuclear Power ◽  
Power Plants ◽  
Electric Power Industry ◽  
Power Industry ◽  
Pressure Vessels ◽  
National Standards ◽  
Nondestructive Examination ◽  
Mechanical Field ◽  
Technical Requirements

Korea Electric Power Industry Code (KEPIC) has been developed on the basis of referring to the prevailing U.S. codes and standards which had been applied to the electric power facilities in Korea. KEPIC has been applied to the construction of Ulchin Nuclear Units 5&6 since 1997 as per the endorsement of Ministry of Science and Technology, and is being completely applied to the construction of Shin-Kori and Shin-Wolsung Nuclear Power Plants (NPPs) in Korea and of Barakah NPPs in UAE. Although the technical requirements of KEPIC related to design and inspections for pressure vessels have been developed on the basis of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPVC), Korea Electric Association (KEA) that is KEPIC maintenance organization is trying to find and improve unreasonable requirements based on the acquired experiences for the continuous construction and operation of NPPs. In the administrative requirements, KEPIC, unlike ASME, adopted not only mechanical field but also electrical field related to NPPs. Furthermore, the qualifying system for services such as Nondestructive Examination, Heat Treatment, Design and Equipment Qualification Organization was adopted to improve safety and reliability for NPPs. In the technical and administrative requirements, KEA has been performing betterment studies such as ‘integration of welding coordinator in welding quality system of KEPIC’, ‘induction of Korean national standards (KS) materials equivalent to ASME/ASTM materials into KEPIC-MH codes’. The result of study for development of Steel-plate Concrete (SC) structure and modularization technique for NPPs has been adopted to 2010 edition of KEPIC-SNG.

Solid Solution Effects and Deformation Micros trueture of Shock-Loaded Iron Manganese Alloys

1970 ◽  
Vol 28 ◽  
pp. 420-421
Author(s):  
A. Christou ◽  
J. V. Foltz ◽  
N. Brown
Keyword(s):  
Solid Solution ◽  
Shock Loading ◽  
High Strain ◽  
Local Stress ◽  
Strain Rates ◽  
Local Stress Concentration ◽  
Bcc Metals ◽  
Manganese Alloys ◽  
Iron Manganese ◽  
Transmission Microscope

In general, all BCC transition metals have been observed to twin under appropriate conditions. At the present time various experimental reports of solid solution effects on BCC metals have been made. Indications are that solid solution effects are important in the formation of twins. The formation of twins in metals and alloys may be explained in terms of dislocation mechanisms. It has been suggested that twins are nucleated by the achievement of local stress-concentration of the order of 15 to 45 times the applied stress. Prietner and Leslie have found that twins in BCC metals are nucleated at intersections of (110) and (112) or (112) and (112) type of planes.In this paper, observations are reported of a transmission microscope study of the iron manganese series under conditions in which twins both were and were not formed. High strain rates produced by shock loading provided the appropriate deformation conditions. The workhardening mechanisms of one alloy (Fe - 7.37 wt% Mn) were studied in detail.

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