HAZOP & QRA for CNG Station & CGS station of Warangal GA , at Megha city gas distribution in-line with PNGRB Regulations

An energy-efficient India is the goal of Megha City Gas Distribution Pvt. Ltd, a division of Megha Engineering and Infrastructures Limited (MEIL). By providing green fuels like compressed natural gas (CNG) for automobiles and piped natural gas (PNG) for residential, commercial, and industrial users, it meets the nation’s energy needs. It also builds CNG stations, City Gate stations (mother stations), main and distributary network pipelines.

The MDPE Pipeline in the MCGDPL-Warangal region provides CNG distribution to Narsampet and the Warangal region. The QRA research was carried out using the MDPE Pipeline documents that were available, and the study’s summary and conclusions apply to MDPE Pipelines that supply Megha City Gas Distribution Pvt Ltd-Narsampet CGS with CNG distribution to the Narsampet and Warangal regions.

The CNG stations are classified into the following categories:

  • Online stations
  • Mother Stations
  • Daughter Booster Stations
  • Daughter Stations

City gas distribution is a facility designed to provide piped natural gas to residential, commercial, and Industrial users in a city or town, primarily for use as fuel. Through a transmission line, the system receives high pressure, deodorized gas from the transporter. It then filters, reduces pressure, odorizes, and checks metering at City Gate Station (CGS) before supplying the gas to the clients. The network design used will determine whether the pressure reduction occurs in four stages. Pressure is lowered initially at CGS, then at DRS, then at the service regulator, and finally at the customer’s residence. The odorization for imparting smell to gas is installed at City Gate Station (CGS). The system has major assets like, City Gate Station (CGS), underground MDPE distribution network, DRS, MP PE network, service regulators, LP PE network, and customer connections.

The CNG Station collects the natural gas (NG) from neighbouring mother stations above 200 bar via a movable cascade or a pipeline operating between 19 and 22 bar. The gas would be transported to Dispensing Units (DU) and Cascade in Online and Mother stations after being compressed by a compressor. Additionally, after being compressed to 250 bars in Daughter Booster stations, the gas would be transported to Dispensing Units (DU). Additionally, at Daughter stations, the gas would be supplied to Dispensing Units (DU) without compression.

The evaluation will be predicated on the risks that could materialize throughout project operations, as per the information at hand. Only the many elements connected to the suggested facility are included in the scope of work. This research does not include any other facilities that are not a part of the proposed activities. The QRA study for the Project includes coverage for the following facilities.

  • MDPE Pipeline, Warangal GA

This study’s primary goal is to methodically and quantitatively assess the possible hazards connected to a given circumstance, course of action, or choice. The following are QRA’s objectives:

  • Involves assessing and quantifying risks in various scenarios through the use of numerical data and analysis.
  • Facilitates educated decision-making by providing options.
  • Gives risks numerical values so that they can be compared and prioritized.
  • Offer stakeholders a methodical and transparent means of receiving information about risks.
  • Offer stakeholders a methodical and transparent means of receiving information about risks.
  • Evaluate the cost-effectiveness of various risk management techniques by contrasting the anticipated benefits of risk reduction with the possible costs of risk mitigation measures.

Two portions of the MDPE Pipeline Warangal have been separated: the 90mm pipeline and the 63mm pipeline. These pipelines are divided into 14 station isolation scenarios and 11 pipeline isolation scenarios of each type. Using DNV PHAST 8.4, the major plausible outcome events of the fireball, flash fire, overpressure explosion, and jet fire have been identified, and their effects and implications have been calculated for each scenario. DNV SAFETI 8.4 was used for the risk analysis, yielding risk data in the form of F-N curve and LSIR contours. Based on the Risk Acceptance Criteria, these risk results were evaluated. It was discovered that the societal risk and IRPA both primarily fall within the ACCEPTABLE range.