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Bently Nevada Seal Leak DetectionPresentation Transcript
Bently NevadaThe Plant Asset Management Company SM System 1™ and Seal Leak Detection Machinery Asset Management for Optimal Business Performance
Air quality regulations are driving this.Typical wording:How are equipment leaks defined?• Compressors: A leak occurs when a design-specific sensor indicates a failure ofseal or barrier fluid systems•Pumps in light liquid service: emissions of 10,000 ppm (or more) organiccompounds, or there are indications of liquids dripping from the pump seal.How must equipment leaks be monitored?•Weekly: visual inspection of pump seals. Whenever liquid leaks are observed, thevolatile organic compound concentration shall be monitored immediately.•Quarterly: compressor seals, pipeline valves and pressure relief valves•Annually: pump seals, pipeline valves in liquid service, and process drains.How are repair schedules and procedures defined?• Attempts at repair must be made within five days of detection of a leak, and must becompleted within 15 days of leak detection.
Typical installation Single stage mechanical seal SLD pressure transducer fitted to standard NPT tee Vent line with existing Exit orifice isolating valve (to flare line) Seal chamber Flush line Throttle bushing (auxiliary sealing Throat device)bushing Rotating seal stationary seal member member Cross-section of single-stage shaft seal
Simple system architecture Control Room Field mounted DSM units System 1 Host To Plant ComputerInformation Optic fibre Network LAN Portable data collector for TIM Line or wireless manual inspection routes connection Direct Input Transducers
System 1 intuitive interface Ideal platform to build plant-wide asset management program
Seal Pressure Sensor andflexiTIM™ Module Features• Division 1, 2 approved & designed to IP66• Sensor may be exposed to H2S, H2SO4, Naphthenic acids, caustics, standard hydrocarbons• Pressure rating -Operating - 30 psig (gage) -Proof Pressure - 300 psig -Burst Pressure - 400 psig
Single stage shaft seal alternative strategies 3. Thermocouple at end of shaft seal 2. SLD sensor on brg housing O/B sump drain 1. SLD sensor on seal drain line
Two stage shaft seal example Potential pressure Barrier Fluid outlet Sensor locations Seal Flush Line Barrier Fluid inlet
Typical Parameters• Steady-state vent line pressure: 0 to 10 psi (up to 70 kPa)• Operators set alarms at 20 psi (140 kPa)• Full Range of transducer is 30 psi (207 kPa)• Seal temperature may change by + /- 10 to 20 degC withseal failure (depending of working fluid)
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