... or after extended shutdown periods. In areas where vapor pockets are formed in the pipe, the pipeline head reaches the elevation. Within those segments with both liquid and vapor, the mixture velocity accelerates and decelerates to compensate for the mass density variation during the change of phases...

... and an evolving expectation is that the response to such an event be automated to the greatest extent possible, potentially initiating an automatic pipeline shutdown upon receipt of a system-based rupture alarm. These types of performance expectation are challenging to achieve with conventional, model-based, leak...

... ABSTRACT Centrifugal compressors are subject to transient events, such as emergency shutdowns, which can cause energetic surge events during rapid shutdown transients. Many modeling tools are used to predict the behavior of compressor systems during fast transient events. Even more...

... and travel times of the existing anti-surge valves, delay of the coast down action, failure of the non-return valves (NRVs), action of a blowdown valve on the emergency shutdown (ESD) sequences, recycle valve bypasses, check valve arrays, and process upset conditions. The results of this analysis provide...

... pipeline system shutdown equation of state pipeline flow rate transient event result temp gpm piping simulation steady state condition viscosity crude oil center crude oil Copyright 2011, Pipeline Simulation Interest Group This paper was prepared for presentation at the PSIG Annual Meeting...

... of improvement. The emergency plan is shown in Figure 2. low pressure high pipeline rupture consequence mitigation pt ll low pressure pipeline break response time rupture shutdown mahmood al-rasheed psig 1007 rupture alarm flow rate pipeline rupture location transmitter midstream oil...

... ABSTRACT Being a planning centre for any activities involving suppliers and customers, PETRONAS Gas Control Center (PGCC) involves in challenging tasks of coordinating various type of operation and maintenance activities like offshore, compressor and plant shutdown, curtailment planning...

... Group, P.O. Box 22625, Houston, TX 77227, U.S.A., fax 01-713-586-5955. ABSTRACT Centrifugal compressors are required to rapidly shutdown or trip in the event of a high vibration, a loss of lube oil, or a similar alarm condition and to avoid energetic surge events during these rapid shutdown transients...

... the fluid comes to rest. correlation freita rachid shutdown batch transfer wasan pipeline equation krantz upstream oil & gas assumption concentration reynolds number procedure concentration distribution evaluation velocity profile time instant dispersion coefficient simulation...