documents.json

[
  {
    "id": "doc_001",
    "title": "H2S Gas Detection – Safety Guidelines",
    "category": "Safety",
    "content": "Hydrogen sulfide (H2S) is a colorless, flammable, extremely hazardous gas with a rotten egg odor. It is heavier than air and can accumulate in low-lying areas. Personal gas monitors should be worn at all times in areas where H2S concentrations may exceed 1 ppm. The IDLH (Immediately Dangerous to Life or Health) level is 100 ppm. If an alarm sounds, evacuate immediately and do not re-enter until the area has been declared safe by a qualified safety officer. Continuous monitoring systems should be calibrated every 6 months."
  },
  {
    "id": "doc_002",
    "title": "Dew Point Analyzer Maintenance Procedure",
    "category": "Maintenance",
    "content": "Dew point analyzers measure the moisture content in gases. Regular maintenance includes: (1) Cleaning the sensor probe with dry nitrogen every 3 months, (2) Verifying sensor response time against a certified reference standard, (3) Replacing the sensor element every 2 years or when drift exceeds ±2°C Td. Before performing any maintenance, isolate the analyzer from the process line and purge with dry inert gas. Calibration should be performed using certified humidity standards at -40°C Td and 0°C Td."
  },
  {
    "id": "doc_003",
    "title": "CO2 Gas Monitor Alarm Thresholds",
    "category": "Configuration",
    "content": "Carbon dioxide (CO2) monitors in confined spaces should be configured with two alarm levels: (1) Warning alarm at 1000 ppm – indicates inadequate ventilation and personnel should increase fresh air supply; (2) Danger alarm at 5000 ppm – the 8-hour TWA (Time Weighted Average) occupational exposure limit (OEL). At 40000 ppm CO2 can cause unconsciousness within minutes. Monitors should be positioned at breathing zone height (1.5–1.8 m) and in areas of low air circulation."
  },
  {
    "id": "doc_004",
    "title": "LEL Sensor Calibration for Combustible Gases",
    "category": "Calibration",
    "content": "Lower Explosive Limit (LEL) sensors detect combustible gases. Calibration procedure: (1) Zero the sensor in clean, fresh air away from any gas sources; (2) Apply certified calibration gas (typically 50% LEL methane or the target gas) using the calibration adapter; (3) Adjust the span potentiometer until the display reads 50% LEL; (4) Document results and date in the calibration log. Sensors exposed to high gas concentrations (>100% LEL) may be poisoned and require immediate replacement. Bump testing should be performed daily before use."
  },
  {
    "id": "doc_005",
    "title": "Fixed Gas Detection System Installation Guide",
    "category": "Installation",
    "content": "When installing a fixed gas detection system: Sensor placement is critical. For gases heavier than air (H2S, LPG), place sensors 30 cm above the floor. For lighter gases (methane, hydrogen), sensors should be mounted near the ceiling. Maintain a maximum of 10 meters between sensors in open areas and 5 meters in congested areas. All cables should be routed through conduit and comply with the hazardous area classification (ATEX/IECEx zones). The control panel must be installed in a non-hazardous area and be accessible for maintenance."
  },
  {
    "id": "doc_006",
    "title": "Thermography Inspection – Electrical Panels",
    "category": "Inspection",
    "content": "Infrared thermography of electrical panels should be performed annually. Best practices: (1) Panels should be under at least 40% of normal electrical load during inspection; (2) Use a thermal camera with sensitivity ≤ 0.05°C NETD; (3) Temperature anomalies >10°C above ambient on connections or breakers indicate immediate attention required; (4) Anomalies >30°C indicate critical risk and require shutdown. Common causes include loose connections, overloaded circuits, and failing components. All findings must be documented with thermal images and corrective action timelines."
  },
  {
    "id": "doc_007",
    "title": "Oxygen Deficiency Monitoring in Confined Spaces",
    "category": "Safety",
    "content": "Normal atmospheric oxygen concentration is 20.9% by volume. Confined space entry requires continuous oxygen monitoring. Alarm levels: (1) 19.5% O2 – low oxygen warning, increased ventilation required; (2) 16% O2 – immediately evacuate; SCBA (Self-Contained Breathing Apparatus) must be worn below this level. Oxygen enrichment above 23.5% also poses significant fire and explosion risk. Monitors must be bump-tested before each entry. Pre-entry atmospheric testing must be performed before any worker enters a confined space."
  },
  {
    "id": "doc_008",
    "title": "Gas Analyzer Cross-Sensitivity Reference",
    "category": "Technical Reference",
    "content": "Electrochemical sensors exhibit cross-sensitivity to gases other than the target gas. Key cross-sensitivities: H2S sensors are cross-sensitive to SO2, NO2, and chlorine. CO sensors show significant cross-sensitivity to H2 (up to 50%). O2 sensors are not cross-sensitive but are affected by temperature and pressure changes. When deploying gas analyzers in multi-gas environments, always consult the cross-sensitivity table in the sensor datasheet. Interference filters or catalytic pre-filters may be required in applications with known interferants."
  },
  {
    "id": "doc_009",
    "title": "Portable Gas Detector Battery and Charging Guidelines",
    "category": "Maintenance",
    "content": "Lithium-ion batteries in portable gas detectors: (1) Do not charge in hazardous areas – always charge in safe zones; (2) Full charge takes 8–10 hours; do not interrupt charging cycle; (3) Battery life is approximately 12–18 hours depending on sensor load and backlight usage; (4) Replace the battery pack every 2 years or after 500 charge cycles; (5) Store devices with 40–60% charge if not in use for extended periods; (6) Temperature range for charging: +5°C to +40°C. Never use non-approved chargers as they may cause sensor damage or fire hazard."
  },
  {
    "id": "doc_010",
    "title": "Regulatory Compliance – OSHA 1910.146 Permit-Required Confined Spaces",
    "category": "Compliance",
    "content": "OSHA 29 CFR 1910.146 requires employers to: (1) Identify and evaluate permit-required confined spaces; (2) Implement a written permit-required confined space program; (3) Provide affected employees with training; (4) Perform atmospheric testing using calibrated equipment before entry; (5) Maintain continuous monitoring during occupancy; (6) Have a trained attendant stationed outside; (7) Establish rescue and emergency services. Non-compliance can result in fines up to $15,625 per violation. The permit system must document atmospheric conditions, equipment used, and personnel involved."
  },
  {
    "id": "doc_011",
    "title": "HVAC Integration with Gas Detection Systems",
    "category": "Integration",
    "content": "Gas detection systems can be integrated with HVAC controls to automatically increase ventilation upon gas detection. Integration requirements: (1) Use relay outputs from the gas detector control panel to trigger HVAC fan speed increase; (2) Set relay activation at the first alarm level (warning); (3) Shut down HVAC systems on fire/explosion alarm to prevent spreading combustible gases; (4) Ensure HVAC air intakes are monitored for outdoor gas intrusion; (5) All control wiring must comply with the hazardous area classification. Test the integration monthly by injecting calibration gas to verify automatic HVAC response."
  },
  {
    "id": "doc_012",
    "title": "Sensor Technology Comparison: Catalytic Bead vs Infrared for Methane",
    "category": "Technical Reference",
    "content": "Catalytic bead (pellistor) sensors: Advantages include fast response time (<10 seconds), low cost, and proven technology. Disadvantages: requires oxygen to function, susceptible to poisoning by silicones and lead compounds, and requires frequent calibration. Infrared (IR) sensors: Advantages include operation without oxygen (inert atmosphere compatible), very low cross-sensitivity, longer lifespan (5+ years), and self-diagnostic capability. Disadvantages: higher cost and not suitable for hydrogen detection (hydrogen is IR-transparent). For offshore oil and gas applications where inert gas purging occurs, IR sensors are strongly recommended."
  },
  {
    "id": "doc_013",
    "title": "Gas Detection System Commissioning Checklist",
    "category": "Installation",
    "content": "Pre-commissioning checks: (1) Verify all sensor locations against the approved hazardous area drawing; (2) Check cable continuity and insulation resistance (>1 MΩ to ground); (3) Confirm power supply voltage within ±10% of rated value; (4) Verify all cable entries are sealed against water ingress (IP rating compliance). Commissioning steps: (1) Power-on sequence and warm-up period (typically 30 minutes); (2) Zero calibration in fresh air; (3) Span calibration with certified test gas; (4) Test all alarm relays and audible/visual indicators; (5) Document all readings and sign-off by responsible engineer."
  },
  {
    "id": "doc_014",
    "title": "Volatile Organic Compounds (VOC) Monitoring with PID Detectors",
    "category": "Monitoring",
    "content": "Photoionization Detectors (PID) measure total VOC concentration in ppm using UV lamp ionization. Key points: (1) The isobutylene correction factor must be applied for specific VOC measurements; (2) Lamp energy (10.6 eV most common) determines which compounds are detected – high-energy lamps detect aromatic hydrocarbons; (3) Humidity above 90% RH can significantly reduce sensitivity – some models include humidity compensation; (4) Lamp must be cleaned monthly with isopropyl alcohol; (5) Replace UV lamp every 6 months or when output drops below 50%. PIDs are ideal for detecting benzene, toluene, and other aromatic solvents in petroleum refinery applications."
  },
  {
    "id": "doc_015",
    "title": "Emergency Response Plan for Gas Leak Events",
    "category": "Emergency",
    "content": "In the event of a gas leak alarm: (1) Activate the site emergency alarm system immediately; (2) Evacuate all personnel from the affected zone to the designated muster point; (3) Do not attempt to locate the leak unless trained and equipped with SCBA; (4) Call emergency services and the site emergency response team; (5) Shut off gas supply at the isolation valve if it can be done safely from outside the hazard zone; (6) Prevent ignition sources – no smoking, no electrical switching; (7) Remain at the muster point until the all-clear is given by the incident commander. Post-incident: investigate root cause and update risk assessment."
  }
]