Introduction: Results from several studies indicate that workplace exposure to welding fumes is associated with increased frequency of chronic obstructive pulmonary disease (COPD) in exposed workers. Objective: To assess the prevalence and characteristics of COPD in never-smoking welders. Methods: A cross-sectional study including 53 never-smoking male welders (aged 35–60 years) was performed, ...

nowadays environmental risk assessment is under consideration alike a useful tool in studies for environmental risk management of projects with high level of potential of destruction and hazards. projects of gas transportation pipelines, unlike technical and economical justification in the field of energy supplying for societies, by having danger on environment, need to the continuous studies o...

PURPOSE The aim of the present study was to investigate whether previous long-term exposure to manganese (Mn) via inhalation of welding fumes can cause persistent impairment in neuromotor function even long after cessation of exposure. METHODS Quantitative tests of tremor, motor speed, manual dexterity, diadochokinesis, eye-hand coordination and postural stability were administered to 17 reti...

Welding is one of the key components of numerous manufacturing industries, which has potential physical and chemical health hazards. Many components of welding fumes can potentially affect the lung function. This study investigates the effects of welding fumes on lung function and respiratory symptoms among welders of an automobile manufacturing plant in Iran. This historical cohort study asses...

One of the most important methods of transporting natural gas in Iran and other parts of the world is the utilization of a network of pipelines. Compression station and turbo compressor units play an important role in gas supply through pipelines. One of the primary concerns in these units is the reduction of fuel consumption. By cooling of exhaust gas from the source station, the pressure drop...

Formation of natural gas hydrate is a serious problem in the gas and oil industry because it can plug pipelines and destroy the equipment. This study aimes to evaluate the concentration effect of glycol ethers on their synergism with a commercial kinetic hydrate inhibitor (Luvicap 55W) in sweet natural gas-water systems at a constant temperature of 4 oC and pressure of 95 bar. Hydrate formation...

Several studies suggest that welding is detrimental to the male reproductive system. Welding fume and radiant heat are of interest as possible causal factors. This study investigates semen quality and sex hormone concentrations among 17 manual metal arc alloyed steel welders with a moderate exposure to radiant heat (globe temperature ranging from 31.1 degrees to 44.8 degrees C), but without sub...

Abstract When ensuring the normative limit of heat gas transmitted to main pipelines by means air cooling devices transmission compressor station, modes parallel operation fan motors device system are considered. At same time, a comparison was made methods for adapting factors affecting energy-efficient operating modes. As result, based on mathematical model combustion mode through gas-air devi...