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Emergency Shutdown of Gas Lines

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Development and Manufacture of the Pilot Model of the Automatic Blocking System for Emergency Shutdown of Gas Lines in Accidents at Chemical Facilities

Tech Area / Field

  • ENV-MRA/Modelling and Risk Assessment/Environment

Status
3 Approved without Funding

Registration date
29.05.1997

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Supporting institutes

  • NPO Kaprolaktam, Russia, N. Novgorod reg., Dzerzhinsk

Collaborators

  • Tohoku University / Institute of Fluid Science (IFS), Japan, Sendai

Project summary

The first project objective is to develop an automatic blocking system (ABS), which is completely independent device shutting down the gas line in the event that its flow parameters change by the value exceeding conventional technological variations due accidental gas line loss of sealing.

For the ABS to operate, there are keeping watch on the gas flow parameters, nor the operator command or some drives (mechanical, electrical, pneumatic, etc.) It is thrown into action by the energy of unsteady gas flow produced in accidents.

The ABS pilot model is proposed to be set at the operating chemical facility for performing operational tests under real working conditions.

The second project is to elaborate an engineering program for ABS computation. Based on minimum experimental data, this program will allow the ABS to be designed for operation under different working conditions at other chemical facilities.

Technical Approach

Driveless devices shut down a pipe using the energy of unsteady gas flow produced in accidental breaking. Their action is initiated by the flow itself, but they may be put into operation by automatic commands too.

Analysis and classification of emergency situations, which are not impossible with pipeline systems, will be made by "Kaprolaktam" stock company.

For mathematical simulation of the operating automatic blocking system (ABS) RFNC-VNIIEF computation techniques will be used for 2D and 3D analysis of unsteady gas dynamics and elastoplastic structural dynamics.

Experimental simulations of the accidental pipeline breaking and ABS functioning with varying the operation scale and conditions is to be made at existing model facilities of RFNC-VNIIEF experimental sited after their appropriate updating. After modification the following operations should be independently performed during experimenting:


- optical process recording (high-speed filming);
- recording of dynamic pressures and loads (pressure and stress sensors);
- recording of ABS locking (contact pickups).

Experiments are to be accompanied by 2D and 3D computations of unsteady structural fluid and gas dynamics. Results of model experiments are to be used for verifying computation techniques.

The ABS pilot model will be manufactured at the RFNC-VNIIEF pilot plant.

The ABS model will be tested at the testing ground of "Kaprolaktam" stock company. The testing conditions will be brought to real ones as close as possible.

Potential contribution by foreign collaborators:

Specification of the ABS application for pipeline system of the USA, EU and Japan (types of pipelines, accident scenarios, possible ABS locations, requirements for fast operation and cross-section shutdown factor, safety estimation of pipelines provided with ABS). Coordination of technical experimental conditions.

Joint verification of computation techniques. Elaboration of proposal for future joint activities aimed at ABS implementation (stage of development efforts and tests).


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