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GAS DETECTIONALL-HSE-PRC--170Owner:HSE Performance AssuranceApproved By:Manager, HSE Performance AssuranceRetention Code:CG01Revised: February 2014Review Frequency:Five years or lessTable of Contentspage1.0Scope . 22.0Hazards . 23.0Roles and Responsibilities . 24.05.03.1.Supervisors . 23.2.Workers . 2Safe Operating Practices . 24.1.Approved Equipment. 24.2.Sensors and Set Points. 34.3.Bump Testing (Function Testing) . 34.4.Calibration . 44.5.Equipment Usage. 4Document Retention . 5Appendix A – Products Causing Potential Sensor Damage . 6Appendix B – Definitions . 6Appendix C – Revision Record . 7

GAS DETECTIONCanada1.0ScopeThe Gas Detection procedure covers the use of personal, portable continuous and tube-type gas detectorson ConocoPhillips Canada (CPC) locations. Fixed gas detection equipment is not included in the scope of thisdocument and is contained within fixed combustible gas, H2S and fire detection specifications for eachbusiness unit.2.0Hazards 3.0Toxic gasFireExplosionOxygen deficient or enriched atmosphereImproperly calibrated equipmentRoles and Responsibilities3.1.Supervisors 3.2.Workers 4.0Ensure adequate gas detection equipment is available at the worksite.Provide employees with training in the use and maintenance of gas detection equipment.Regularly review function test and calibration records to verify compliance with this process.Properly select and use gas detection equipment according to the task hazards.Use and maintain the gas detection equipment in accordance with this process and theapplicable manufacturer’s instructions.Safe Operating Practices4.1.Approved Equipment Approved gas detection devices include personal gas detectors, portable continuous gasdetectors and tube-type detectors. Personal gas detection devices must not be used for operations requiring portablecontinuous gas detection devices. Equipment designed and engineered to be attached to a personal monitorconverting the detector to an aspirated, continuous detector will be deemedacceptable if used in accordance with the manufacturer’s directions. The attachment must be used with a separate personal gas detection device fromthose being used by the workers.Rev Date: February 2014Page 2 of 7Controlled if viewed via the CPC intranet. Uncontrolled versions of this document are validto be used until notified of revision via the Document Control Process.

GAS DETECTIONCanada Portable continuous gas detection devices must be able to provide continuous atmosphericreadings and are mandatory in the following circumstances at a minimum: Confined space entry. Hot work (as specified in CPC’s hot work procedure (ALL-HSE-PRC-175) Purging. Other situations as determined by site-specific operating procedures or hazardassessments. Tube-type detectors may only be used for confirming gas concentrations and not forongoing monitoring. Detector tubes only provide an approximate measure of gas concentrations. Readings may take up to one minute to register. Accuracy of tubes is 25% of the indicated reading.4.2.Sensors and Set Points Personal gas detectors must be equipped with the following sensors: Combustible gases - Lower Explosive Limit (LEL)Oxygen (O2)Hydrogen sulphide (H2S)Carbon monoxide (CO)Portable continuous gas detection devices must be equipped with the appropriate sensors forthe activities being completed.Personal gas detectors alarm settings must be set using the table below.Low AlarmHigh AlarmLELO2H2SCO102019.523101525200Note: In British Columbia, Low and High H2S settings must be set to 10 ppm Personal gas detectors must not be utilized to determine or measure personnel exposure.Time weighted average (TWA) and short-term exposure limit (STEL) settings and alarms, ifavailable on instruments, must not be utilized.4.3.Bump Testing (Function Testing) To assure functionality, personal and portable continuous gas detectors must be bump tested(function tested) prior to each day’s use in accordance with the manufacturer instructions.Retain all bump test records in accordance with the record retention guidelines. Records may bekept in electronic or paper formats.Personal and portable continuous gas detectors must also be bump tested as soon as isreasonably practicable in the following circumstances: Rev Date: February 2014An exposure causes the detector to alarm.The detector is dropped or exposed to a physical shock.Page 3 of 7Controlled if viewed via the CPC intranet. Uncontrolled versions of this document are validto be used until notified of revision via the Document Control Process.

GAS DETECTIONCanada4.4.Calibration Calibrate gas detectors as per manufacturer’s specifications, with a frequency not exceeding90 days.Retain all calibration records in accordance with the record retention guidelines. Records maybe kept in electronic or paper formats.Personal and portable continuous gas detectors must also be calibrated in the followingcircumstances: 4.5.An over-range occurs on a sensor.The detector fails a bump test.The monitor is exposed to liquids or condensation.Any gas detection device that fails a calibration test or is found to be otherwise defective is tobe tagged as out of service and repaired prior to being returned to service.Equipment UsageNote: Most detectors are oxygen-dependent and will not provide reliable readings in an oxygendeficient atmosphere. Check the manufacturer’s specifications as some detectors requirethe oxygen content to be greater than 16 percent to function correctly.Note: Ensure that the gas detector used has the appropriate sensors installed for the productsbeing tested and the proper gas was used for the calibration and function tests.Note: Self-contained breathing apparatus (SCBA) or supplied-air breathing apparatus (SABA) mustbe worn when determining H2S concentrations or when measuring unknown atmospheres. Personal gas detectors must be worn by all workers on CPC locations, except in the followingcircumstances: Where a crew of more than one worker is working together in close proximity to each otheron a single sweet location deemed safe and recorded on a site-specific hazard assessment,at least one personal gas detector must be available to the crew (e.g., labour crews, casingcementers and wireline loggers, etc.).Where a lease has been fully abandoned with no surface facilities remaining.Drilling and completions rig personnel may work without personal monitors providedcontinuous monitoring is used on the rig floor, substructure, and mud tanks.Wear personal gas detectors near the worker’s breathing zone on the outer layer of clothingwith the sensors facing outwards. Detectors may be worn within mesh pockets if they are withinthe breathing zone and do not hinder airflow to the monitor sensors.Prior to proceeding with work or building entry, verify non-hazardous atmospheric conditions byfollowing work site entry procedures. Rev Date: February 2014Under normal operating conditions, it is not expected that combustible or toxic gases arepresent in detectable concentrations. In these conditions, one may use a personal gasdetector to verify the absence of combustible or toxic gas (LEL, H2S, CO, and O2).Page 4 of 7Controlled if viewed via the CPC intranet. Uncontrolled versions of this document are validto be used until notified of revision via the Document Control Process.

GAS DETECTIONCanada Where portable continuous gas monitoring is required, the necessary equipment andatmospheric testing requirements (i.e., interval or continuous) must be identified on the hazardassessment. Prior to starting work and at the identified frequencies, the readings must berecorded on the hazard assessment. When a monitor goes into alarm, it is indicating there may be a dangerous environment present. 5.0Record all atmospheric readings on the file copy of the hazard assessment for auditpurposes.The wearer must ensure the work area is evacuated immediately and in a safe manner.Work must not continue in the area until the source of the alarm has been identified andcontrolled.Several cleaners, solvents and lubricants can contaminate and potentially cause permanentdamage to the sensors. See Appendix A – for a listing of common products to avoid whenutilizing gas detection equipment.Document RetentionRecords must be retained in accordance with ConocoPhillips’ Document Retention Schedule.RecordOwnerClassificationBump Testing and Calibration RecordsField LeadershipEF04Rev Date: February 2014RetentionDisposition of Equipment 10 yrsPage 5 of 7Controlled if viewed via the CPC intranet. Uncontrolled versions of this document are validto be used until notified of revision via the Document Control Process.

GAS DETECTIONCanadaAppendix A – Products Causing Potential Sensor DamageThe following table lists products that should not be used in close proximity to the sensors due to the potential forsensor contamination.Cleaners and Lubricants Silicones Alcohol based cleanersAnionic detergentsBrake cleanersCitrus based cleanersDish soapsHand sanitizersLubricantsMethanolRust inhibitorsWindow and glass cleaners Hand/body and medicinal creams thatcontain siliconeMold releasing agentsPolishesSilicone based adhesives, sealants andgelsSilicone cleaners and protectantsTissue containing siliconeAerosols Bug repellents and spraysLubricantsRust inhibitorsWindow cleanersAppendix B – DefinitionsBreathing Zone An imaginary hemisphere forward of the shoulders with a radius of approximately 6-9 inches.Also called a personal gas monitor. A compact four-head (LEL, O2, H2S and CO) detection device designedto be attached to and worn on the exterior of the clothing of an individual. It is intended to provide a lastPersonal Gas Detector line of defense warning to individuals of imminent danger. This device is to remain affixed to theindividuals clothing continuously while occupying any hazardous area.Also called a portable gas monitor. An electronic aspirated hand-held device designed to be carried andPortable Continuous used for continuous atmospheric monitoring of potentially hazardous atmospheres. These devices areGas Detection Device configured according to the task being undertaken. Unlike the personal gas detectors, they are notdesigned to be affixed to an individual’s clothing.These are bellows-type pumps that draw a known volume of air across tubes containing treated adsorbentTube-Type granules that react with a specific compound or group of compounds, causing the adsorbent to changeGas Detection Device color. After sampling, the length of adsorbent bed that has undergone the color change is measured froma scale printed on the tube.Rev Date: February 2014Page 6 of 7Controlled if viewed via the CPC intranet. Uncontrolled versions of this document are validto be used until notified of revision via the Document Control Process.