000			02109nab a2200205 4500
005			20260520003101.0
008			260224s2012 xxu ing
041			_aInglés
245	0	0	_aTechnical Assessment of Isothermal and Non-Isothermal Modelings of Natural Gas Pipeline Operational Conditions
260			_a _b _cmayo/jun. 2012
270			_a15/05/2013 ; 15/05/2013
300			_a14 p. ; 435-449
520			_aTraducción del resúmen del autor: Modeling of equipment in a gas pipeline was performed here by deriving a new form of conservation equation set for compressible flow. Then a section of the third Iranian gas transmission pipeline (Nourabad-Pataveh-Dorahan, N-P-D) was investigated by isothermal (IT) and non-isothermal (NIT) modeling approaches taking into account the effects of ground temperature. In the first part, the steady state operation of the N-P-D pipeline including a compressor station at Pataveh was studied. For the known values of natural gas mass flow rate, and inlet/outlet gas pressures at Nourabad/Dorahan points, the IT and NIT modelings showed about 33.7%, 16.6% and 23% maximum difference percent points for the compressors head, compressors rotational speed and fuel consumption rates respectively. In the second part, the unsteady operation of the N-P-D pipeline due to the shutdown of a compressor at Pataveh Compressor Station (PCS) was studied. The results confirmed that at lower ground temperatures (0 and 20°C), the remaining compressors could compensate the loss of one compressor. However, at higher ground temperatures (40 and 50°C), the compressors had to run faster than the highest permissible speed to be able to deliver a certain mass flow rate without reducing the required pipeline pressure. In all above studied cases, the computing time for the non-isothermal modeling was about three times longer than that for the isothermal one.
581			_a3
773	0		_tOil and Gas Science and Technology _g67
942			_cARTICULO
100	1		_aSanaye, S. _953190
100	1		_aMahmoudimehr, J. _953191
999			_c187695 _d187695