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Case Study W. K Allah, F. Ballard, A. Al-Dhafiri Saudi Aramco (Hydrocarbon Processing – August 2018)
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Pump TypeAPI 610 BB2 – 6 Stages Qty3 ServiceFirst-Pass Reverse-Osmosis FluidRaw Water Flowrate (rated)320 gpm Discharge Pressure650 psig Suction Pressure50 psig Power200 HP
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Six-Stages, Back to Back, No balance line, DE (Drive End) Seal Chamber Pressure equivalent to suction pressure. NDE (Non-Drive End) Seal Chamber Pressure equivalent to third –stage discharge pressure.
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API PLAN 32 Plan 32 uses a flush stream brought in from an external source to the seal The typical design life for a mechanical seal is 3 yrs.
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Pump Non-Drive End Mechanical Seal (NDE) Drive End Mechanical Seal (DE) Flush Stream Source
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Fluctuating Pressure in NDE Seal Chamber
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Why? Source
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Plan 13 Modified (Only for NDE): ◦ Drainage from Seal chamber to Sump, ◦ Flow regulated by valve (3 lpm)
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DE: Plan 32 ◦ (Flush Source Pressure > DE Pressure Needed) NDE: Plan 11+62 ◦ Previously verified TSS < 5 m ◦ Plan 62: Prevent formation of solids from raw water, From Flush Source (180psi) Pressure limited to 3-5 psi with PCV.
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What happened during Seal Plan Change? ◦ Noise: Plan 11 Orifice was installed in wrong direction New hole had to be drilled for Plan 62 Drain Connection
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Choose the correct Seal Plan, Verify DE and NDE Seal Chamber Pressure Verify Availables Utilities
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