The stamina of non-gasketed, flanged pipe connections

Stress variations showing flange yielding, flange rotation, effects of joint tightening sequence, identification of the mode of response to loading (static or dynamic) is discussed. In addition the effects of re-tightening, importance of high quality bolting with proper surface treatment and use of proper tooling are also discussed

Determination of load capacity of a nongasketed flange joint under combined internal pressure, axial and bending loading for safe strength and sealing

Performance of a bolted flange joint is characterized mainly due to its ‘strength’ and ‘sealing capability’. A number of analytical and experimental studies have been conducted to study these characteristics only under internal pressure loading. A very limited work is found in literature under combined internal pressure and bending loading. Due to the ignorance of external loads i.e. bending and axial in addition to the internal pressure loading, an optimized performance of the bolted flange joint can not be achieved. The present design codes do not address the effects of combined loading on the structural integrity and sealing ability. To investigate joint strength and sealing capability under combined loading, an extensive comparative experimental and numerical study of a non-gasketed flange joint with two different taper angles on the flange surface and with different load combinations is carried out and overall joint performance and behavior is discussed. Actual joint load capacity is determined under both the design and proof test pressures with maximum additional external loading (axial and bending) that can be applied for safe joint performance

A parametric study of metal-to-metal contact flanges with optimised geometry for safe stress and no-leak conditions

This paper presents the results of a parametric study of the behaviour of metal-to-metal contact flanges that have different surface profiles. Using a finite element analysis approach, the important stress values in the flange and bolts and flange rotation/displacement have been obtained for variations in flange thickness, bolt pre-stress and taper angle (different surface profiles) whilst maintaining other leading flange dimensions (hub length and hub thickness) constant, when the vessel/flange component is subjected to internal pressure. In addition, results are compared for the flange geometry with no taper angle on the flange surface with the predictions obtained from the appropriate sections of the ASME, PD5500 and new European unfired pressure vessel standard EN 13445 Part 3. Based on the results of this study, the best flange dimensions are recommended for 'no leak' conditions from the joint

The Role of Digital Economy and International Trade on Ecnonomic Growth in Indonesia

In recent years, economic growth has shown fluctuating numbers, one of the consequences of which is Covid-19. The digital economy utilizes fintech technology such as p2p lending has a strategic role in economic growth activities moderated by export, import, and population variables. The data in this study uses Indonesian panel data from 2020 to 2022. The data analysis technique uses the Panel Data Regression method. Based on the results of the partial test of p2p lending has a negative and significant effect, exports have a positive but not significant effect, imports have a negative and insignificant effect and population has a positive and significant effect on economic growth. The results of the simultaneous test of all variables have a significant effect on economic growth

Green construction in India: gaining a deeper understanding

A workshop on green construction was organized in New Delhi in July 2008 by Jamia Millia University, India and University of Salford, U.K., aiming to increase 'green' practices that are environmentally friendly and energy efficient. The workshop included participants from regulatory bodies, public and private construction companies and researchers. The object of the workshop was to provide an opportunity to capture issues, challenges and research issues in green practices throughout the supply chain in the construction sector in India. The methodology constituted a survey that was provided to all participants, where eight questions were composed by the facilitators. The participants were asked about their views on voluntary and compulsory ways of assessment and audit of green implementation in India. The findings of the workshop featured major challenges, drivers, initiatives, and the ways of effective implementation as well as enforcement on the discussed topic

To Duckweeds (\u3cem\u3eLandoltia punctata\u3c/em\u3e), Nanoparticulate Copper Oxide is More Inhibitory than the Soluble Copper in the Bulk Solution

CuO nanoparticles (CuO-NP) were synthesized in a hydrogen diffusion flame. Particle size and morphology were characterized using scanning mobility particle sizing, Brunauer–Emmett–Teller analysis, dynamic light scattering, and transmission electron microscopy. The solubility of CuO-NP varied with both pH and presence of other ions. CuO-NP and comparable doses of soluble Cu were applied to duckweeds, Landoltia punctata. Growth was inhibited 50% by either 0.6 mg L−1 soluble copper or by 1.0 mg L−1 CuO-NP that released only 0.16 mg L−1 soluble Cu into growth medium. A significant decrease of chlorophyll was observed in plants stressed by 1.0 mg L−1 CuO-NP, but not in the comparable 0.2 mg L−1 soluble Cu treatment. The Cu content of fronds exposed to CuO-NP is four times higher than in fronds exposed to an equivalent dose of soluble copper, and this is enough to explain the inhibitory effects on growth and chlorophyll content

Optimization Study of Preparation Eucalyptus Trees Activated Carbon for Removal of Methylene Blue Dye from Aqueous Solution

Mesoporous activated carbon were  prepared from eucalyptus trees stalks (ES) using physiochemical activation method, which  consisted of potassium hydroxide (KOH) treatment and carbon dioxide (CO2) gasification. Based on the central composite design (CCD), two factor interaction (2FI) and quadratic models were respectively employed to correlate preparation of the activated carbon with these variables. The effects of the activation temperature, activation time and chemical impregnation ratios on the carbon yield and methylene blue removal were investigated. From the analysis of variance (ANOVA), the most influential factor on each experimental design response was identified. The optimum conditions for preparing activated carbon from eucalyptus stalks were found to be activation temperature of 650 oC, activation time of 0.5 h and chemical impregnation ratio of 2.5. The carbon yield was found to be 22.3% while the removal of methylene blue was found to be 89%. Keywords: Eucalyptus stalks; Optimization; Activated carbon; Adsorption; Methylene blue.