Integrated Design Of A Port For A Thermal Power Plant

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Monitoring Lateral Deflections of a Berthing Structure During Dredging — A Case Study

For one of the major ports in India, a shallow water berth is recently constructed comprising of a diaphragm wall and pile rows to support the deck structure. The soil strata are essentially very soft clay extending to a large depth. Reclaiming land behind this structure created number of problems including mud flow. The structure was constructed after placement of fill required for reclamation. After completion of the structure, when dredging work was undertaken, it was decided to monitor the lateral movements of berths, as the dredging depth increases. For this purpose inclinometer tubes were installed in one of the diaphragm wall panels and another in one of the piles of the structure. The structure is analysed using PLAXIS finite element software and results are compare with field measurements which are in good agreements

Measurement of Vibration in Berthing Structure During Underwater Rock Blasting

Blasting, in particular underwater rock blasting is the most challenging and least understood source of vibration, which may cause considerable damage to the safety of the adjacent buildings and structures and including berthing structures. Though the blast-induced vibration is best controlled by specification of blasting procedures, it is very essential to measure and monitor the blast-induced vibration of the adjacent structures to access its safety. This paper discusses the measurement and monitoring of underwater blast induced vibration on the berthing structure (berth No.8) at Tuticorin in southern part of India. The vibration is recorded using three acceleration transducers mounted on the deck slab of berthing structure and monitored using a data efficiency system consisting of HBM make multi channel carrier frequency amplifier system with digital storage oscilloscope. It is observed that the peak vertical acceleration is much higher than the longitudinal and lateral peak acceleration, because of vibration of deck slab along with frequency of ground excitation. The peak particle velocity (PPV) is obtained from the time history of acceleration by simple integration. From the spectral analysis, the predominant frequency is found as 26 Hz. For this frequency the allowable PPV value is established from various standards as 25mm/sec. The measured PPV values fro all blasts (31 nos) are well below the limit of allowable PPV value, except in few blasts, which shows the berth is safe against underwater blast induced vibration. Pre and post crack survey also proves that there is no considerable damage to the berthing structure

Design of Barrage Style Tidal Water Power Plant Structure to Reduce Sediment Accretions in Approach Channel, Entrance, Harbour and Backwaters of Cannanore Port, Kerala

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Failure of Offshore Concrete Piles During Construction

Two offshore piles of 1000 mm diameter with 1 m socketing into rock in 15 m water depth have failed during construction. The analysis of failure considering wave and current forces, structural and foundation capacities and vibration measurement on freshly concreted and well set piles is discussed

INNOVATIVE HARSH ENVIRONMENT DRY-TREE SUPPORT SEMI-SUBMERSIBLE FOR ULTRA DEEPWATER APPLICATIONS

ABSTRACT Natural heave period exceeding over 21 sec is not the only important design criteria for the design of an ultra deepwater semi-submersible for dry-tree support application. The key design features that would enhance the applications of the semi-submersible design for ultra deepwater are vessel motion characteristic, heave natural period, high air-gap, large deck-area, large deck payload, reduced mooring load, large riser pull-down load, feasible for dynamic positioning, feasible for dry-tow, feasible for wet-tow, feasible for self-installation, feasible for quay-side top side integration, feasible for float-over installation. This paper presents the design innovations of the semi-submersible that has reached the above listed desired key factors. The designed vessel supports drytree with large riser loads resulted from ultra deepwater which is decoupled and is also independent of the designed top side pay load. The design is streamlined to withstand harsh environment. The vessel is designed to favor both options with quay-side deck integration or float-over deck installation. Extreme low accelerations in extreme wave environment on top of the above desired features make this semi-submersible suitable for harsh environment and ultra deepwater applications. A brief summary of hydrodynamic response of the vessel is added in this paper

Clinical significance of umbilical cord abnormalities: an observational study

Background: The well being of a foetus depends on the uncompromised placental function and normal blood flow through the umbilical vessels. If there are umbilical cord abnormalities, it can lead to perinatal complications. The aim of the study was to analyse the prevalence of umbilical cord abnormalities and to study the relationship between the cord abnormalities and intrapartum complications.Methods: This was a prospective observational study conducted at a tertiary care hospital, Chennai, from September 2020 to August 2021. Four hundred mothers who met the inclusion and exclusion criteria were included in the study. At the time of delivery, umbilical cord , intrapartum and neonatal details were noted. The association between the cord length and parameters such as nuchal coiling, FHR changes, mode of delivery, APGAR at birth and NICU admissions were analysed and the statistical significance was derived.Results: The mean cord length was 57.44±20.11 cms. 65% had normal cord length, 15% had short cords and 20% of babies had long cords. Nuchal coiling was seen in 31.75%, cord prolapse in 0.75% and true knot in 1% of cases. Cases with long cords were associated with statistically significant increase in the incidence of nuchal cords, multiple cords, FHR abnormalities, operative interventions and birth asphyxia. The presence of short cord was not associated with significant adverse maternal and perinatal outcome.Conclusions: This study showed that 35% of all deliveries were complicated by abnormal cord length and other cord complications. It is important to document these findings in the event of antenatal or intrapartum complications

Hysterosalpingographic findings in infertile women diagnosed with genital tuberculosis

Background: Objectives of the study were to describe the hysterosalpingographic (HSG) findings among infertile women with genital tuberculosis (GTB).Methods: This is a retrospective analytical study conducted at Sri Muthu Kumaran Medical College Hospital and Research Institute, Chennai, from January 2016 to January 2020. Study population included 51 infertile women with genital tuberculosis. GTB was diagnosed by either culture/histopathological examination (HPE) or polymerase chain reaction (PCR) studies. In these proved cases of tuberculosis, HSG findings were analysed. Permission from the institutional review board was obtained for the retrospective analysis of the hospital data.Results: Among 113 women who underwent hysterosalpingography, 51 were diagnosed with GTB. In these 51 women, the HSG finding were normal in 23.5% and were abnormal in 76.5% of cases. The abnormal HSG findings noted in association with GTB were calcification (3.9%) , distorted uterine cavity (3.9%), beaded tubes, intravasation with blocked tubes (5.9%), fimbrial block with hydrosalpinx (15.6%), cornual block (35.3%) and mid tubal block.Conclusions: Though imaging findings may be highly suggestive of tuberculosis, some of the features such as tubal block and hydrosalpinx are not specific for tuberculosis and may be seen in other infective causes of tubal damage also. Therefore, specific investigations for tuberculosis are still required to make a de­finite diagnosis. The presence of HSG features indicate that considerable tubal damage has occurred