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Gas pipelines with sections of different design pressures

Gas pipelines with sections of different design pressures. Bjørn Are Carlsson 1. Juni 2005. Langeled Pipeline. Langeled North diameter 42” design pressure 250/215 barg length 627 km Langeled South diameter 44” design pressure 156,8 barg length 542 km Sleipner Subsea Valve Station (SSVS).

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Gas pipelines with sections of different design pressures

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  1. Gas pipelines with sections of different design pressures Bjørn Are Carlsson1. Juni 2005

  2. Langeled Pipeline • Langeled North • diameter 42” • design pressure 250/215 barg • length 627 km • Langeled South • diameter 44” • design pressure 156,8 barg • length 542 km • Sleipner Subsea Valve Station (SSVS) Aker Kvaerner Engineering & Technology

  3. Mill Test Pressure PPS shall not allow local pressure to exceed MIP Maximum Incidental Pressure (MIP) Tolerance Maximum Allowable Incidental Pressure (MAIP) PPC shall maintain the local operating pressure below DP Pressure Protection System (PPS) Design Pressure (DP) Tolerance Maximum Allowable Operating Pressure (MAOP) Pipeline Pressure Control (PPC) Pressure control and protection Aker Kvaerner Engineering & Technology

  4. PPC PPS-2 PPS-1 Manual Intervention DnV abbreviations PSS PRS PCS Risk reduction according to DNV-OS-F101 X per year without protection Achieved risk reduction from PPCPS Required risk reduction 1x10-5 Frequency of overpressure Aker Kvaerner Engineering & Technology

  5. Pipeline output pressure (measured) MIP SOP DP SOP Pipeline Input pressure (measured) Pipeline Pressure constraints Test pressure 275 barg MIP 262,5 barg DP 250 barg Test pressure 237 barg MIP 226 barg DP 215 barg Aker Kvaerner Engineering & Technology

  6. Historical values Look ahead values Max Design break pressure (barg) Design break pressure (barg) Max Inventory (MSm3) Inventory (MSm3) PPC - limitation of SOP and design break pressure Flow in (MSm3/day) Aker Kvaerner Engineering & Technology

  7. PPS SOP and design break pressure MIP 262,5 barg MIP 226 barg Inlet Outlet pressure (barg) setpoint (barg)2 252.0 196.0 239.4 208.3 234.0 213.6 229.7 217.7 226.6 220.8 223.6 223.1 Aker Kvaerner Engineering & Technology

  8. PPS shutdown delay PPS shutdown delayed depending on pipeline outlet pressure Outlet EV closed Pressure profile steady state Aker Kvaerner Engineering & Technology

  9. Pressure transmitters in 2oo3 configuration Two SIL 3 independent loops PPS-1 and PPS-2 SIL 3 certified communication protocol Outlet EV limit switches in 2oo3 configuration Telemetry system triple redundant EV EV EV PPS-2 PPS-1 PPS-1 PPS-2 PT ZSH ZSL PT PT PT PPS topology Aker Kvaerner Engineering & Technology

  10. EV EV EV EV EV ZSL PT PT PT ZSH ZSH ZSL PT PT PT SIS Langeled Normal operation PPS-1 PPS-2 PPS-1 PPS-2 PPS-2 PPS-1 Aker Kvaerner Engineering & Technology

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