Underground pipelines are widely applied in the so-called lifeline engineerings. It shows according to seismic surveys that the damage from soil liquefaction to underground pipelines was the most serious, whose failures were mainly in the form of pipeline uplifting. In the present study, dynamic centrifuge model tests were conducted to study the uplifting behaviors of shallow-buried pipeline su...

Sir Humphry Davy witnessed the first chlorine hydrate crystallizing in 1811. Couple of century later his discovery, natural gas hydrates has begun to play an important role in energy business. From being a mere chemical curiosity, they have proven to be a nuisance for the natural gas industry. The problem of hydrate induced blockage in “wet gas” flow systems has been widely reported and became ...

Nowadays one of the most important energy sources is natural gas. By depletion of oil reservoirs in the world, natural gas will emerge as the future energy source for human life. One of the major concerns of gas suppliers is being able to supply this source of energy the entire year. This concern intensifies during more consuming seasons of the year when the demand for natural gas increases, r...

The article deals with the issues of determining optimal type piezometric pressure graph in high-and medium-pressure gas pipelines design distribution networks. Along most commonly used ways to reduce cost building networks by finding configuration pipelines, which give a great economic and environmental effect, it is necessary rationally use drop provided network. This step engineering practic...

When a natural gas pipeline ruptures, the adjacent upstream and downstream automatic control valves (ACV) should close quickly to prevent leakage or explosion. The differential pressure set point (DPS) at each valve location is the main criteria for value setting in ACV actions. If the DPS is not properly adjusted, the ACV may mistakenly close or it may not take any actions at a proper ti...

Most production technologies require a uniform flow path of liquid from pressure distribution pipelines. To achieve this goal, it is proposed to introduce polymer additives into the or use converging pipelines with continuous longitudinal slot in wall. reduce uneven operation pipeline during discrete dispensing, cylindrical output rotary nozzles lateral orthogonal entry jet nozzle. The problem ...

This article discusses issues related to the study of hydraulic resistance on pressure pipelines hydropower plants pumping turbid water flow. Experimental studies, carried out in laboratory conditions a bench model, pursued main goal studying nature changes losses various characteristic sections for All experimental studies were with different local resistances and along length section.To clari...

among 14,102 patients admitted in teaching hospitals of the isfahan medical school, whose records were studied, 2,122 or 15.4% of patients had high blood pressure. the most common reason for blood pressure in this group was diseases of the kidney and for those, glomerolonephritis and pilonephrititis were important causes. among patients under 30 years old, high blood pressure was twice as commo...