Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

The non-dimensional diagram of automatic line-break control valve performance domain in gas transportation pipeline

Authors
Mahdi Mahmoodi
Mofid Gorji
Department of Mechanical Engineering, Babol Noshirvani Univ. of Technology, Babol
Abstract
The effects of orifice diameter, pipeline initial pressure and pressure drop rate due to rupture on the differential pressure of diaphragm valve in a automatic line-break control valve have been studied by experiments. The fluid in this experimental investigation was nitrogen. The reference tank is connected to the pipeline through a calibrated orifice with check valve. The tank pressure is higher than pipeline pressure when pressure reduction occurs by line breaking. If the pressure difference between tank and pipeline is higher than the sustainable pressure value of diaphragm valve, the valve will be closed by actuator. The differential pressure of diaphragm valve is increased by the growth of pipeline pressure drop rate. The occurrence time of maximum differential pressure of diaphragm valve just depends on the orifice diameter. The maximum of differential pressure increases with the decrease of orifice diameter. The setting differential pressure of control valve was increased by decrease of pipeline initial pressure or orifice diameter or increase of pressure drop rate. The curves of non-dimensional maximum differential pressure generated by non-dimensional pipeline pressure drop rates are shown for different orifice diameters and pipeline initial pressure. These important curves will be used for design and setting of these automatic line-break control valve operation.
Keywords
Automatic Control Valve
Gas Line-break
Initial Pressure
Pressure Drop Rate
Non-dimensional Diagram

Subjects

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Iranian Journal of Mechanical Engineering Transactions of ISME
Volume 19, Issue 2 - Serial Number 47
Fluid Mechanics and Heat Transfer
Autumn 2016
Pages 41-59

  • Receive Date 22 October 2016
  • Revise Date 23 February 2017
  • Accept Date 28 February 2017