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BS EN 60079-30-2:2017 Explosive atmospheres - Electrical resistance trace heating. Application guide for design, installation and maintenance, 2018
- undefined [Go to Page]
- Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
- CONTENTS
- FOREWORD
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Application considerations [Go to Page]
- 4.1 General
- 4.2 Corrosive areas
- 4.3 Process temperature accuracy [Go to Page]
- 4.3.1 Type I
- 4.3.2 Type II
- 4.3.3 Type III
- 4.4 Installation considerations
- 5 Thermal insulation [Go to Page]
- 5.1 General
- 5.2 Selection of insulating material
- 5.3 Selection of weather barrier (cladding)
- 5.4 Selection of economical thickness to provide optimum trace heating design
- 5.5 Double insulation
- Figures [Go to Page]
- Figure 1 – Thermal insulation – Weather-barrier installation
- Figure 2 – Typical temperature profile
- 6 System design [Go to Page]
- 6.1 General
- 6.2 Purpose of, and major requirement for, trace heating
- 6.3 Training
- 6.4 Selection of trace heater [Go to Page]
- 6.4.1 General
- 6.4.2 Site-fabricated trace heaters
- 6.4.3 Specific types of trace heating
- 6.5 Maximum temperature determination [Go to Page]
- 6.5.1 General
- 6.5.2 PTC characteristic
- 6.5.3 Stabilized design
- 6.5.4 Controlled design
- 6.6 Heat up and cool down considerations
- 6.7 Design information [Go to Page]
- 6.7.1 Design information documentation
- 6.7.2 Isometric or trace heater configuration line lists and load charts
- 6.8 Power system
- 6.9 Earthing requirements
- 6.10 Earth-fault protection of equipment
- 6.11 Start-up at minimum ambient temperatures
- 6.12 Long trace heater runs
- 6.13 Flow pattern analysis
- Figure 3 – Flow pattern analysis example
- 6.14 Dead-leg control technique
- 6.15 Chimney effect
- Figure 4 – Bypass example
- 6.16 Safety shower and eyewash station design requirements
- 7 Control and monitoring [Go to Page]
- 7.1 General
- 7.2 Mechanical controllers
- 7.3 Electronic controllers
- 7.4 Application suitability
- 7.5 Location of controllers
- 7.6 Location of sensors
- 7.7 Alarm considerations [Go to Page]
- 7.7.1 General
- 7.7.2 Trace heating circuit alarm
- 7.7.3 Temperature alarms
- 7.7.4 Other alarms
- 7.7.5 Integrated control
- 8 Recommendations for installation [Go to Page]
- 8.1 General
- 8.2 Preparatory work [Go to Page]
- 8.2.1 General
- 8.2.2 Scheduling and coordination
- 8.2.3 Confirmation of equipment
- 8.2.4 Receiving materials
- 8.2.5 Warehousing and handling
- 8.2.6 Personnel aspects
- 8.3 Installation of trace heating circuits [Go to Page]
- 8.3.1 Coordination and equipment verification
- 8.3.2 Pre-installation testing and design verification
- 8.3.3 Visual examination
- 8.3.4 Insulation resistance test
- 8.3.5 Component substitution
- 8.3.6 Location of power supply
- 8.3.7 Installation of trace heaters
- Tables [Go to Page]
- Table 1 – Pre-installation checks [Go to Page]
- 8.3.8 Connections and terminations
- 8.4 Installation of control and monitoring equipment [Go to Page]
- 8.4.1 General
- 8.4.2 Verification of equipment suitability
- 8.4.3 Temperature controller and monitoring devices
- 8.4.4 Sensor considerations
- Figure 5 – Typical installation of control sensor and sensor for temperature limiting control
- Figure 6 – Limiting device sensor on sheath of trace heater
- Figure 7 – Limiting device sensor as artificial hot spot [Go to Page]
- 8.4.5 Controller operation, calibration, and access
- 8.4.6 Necessary modifications
- 8.5 Installation of thermal insulation system (see also Clause 5) [Go to Page]
- 8.5.1 General
- 8.5.2 Preparatory work
- 8.5.3 Installation of the thermal insulation materials
- 8.5.4 Cladding
- 8.5.5 Field (site work) circuit insulation resistance test
- 8.5.6 Visual inspection
- 8.5.7 Documentation
- 8.6 Installation of distribution wiring and coordination with branch circuits [Go to Page]
- 8.6.1 General
- 8.6.2 Earth-fault protective device
- 8.6.3 Circuit protective device
- 8.6.4 Tagging/Identification
- 8.7 Commissioning [Go to Page]
- 8.7.1 Pre-commissioning check
- 8.7.2 Functional check and final documentation
- 9 Maintenance [Go to Page]
- 9.1 General
- 9.2 Fault location
- 9.3 Fault rectification
- 10 Repairs [Go to Page]
- 10.1 General
- 10.2 Practicability of repair to electric trace heaters [Go to Page]
- 10.2.1 Mechanical damage
- 10.2.2 Damage due to corrosion
- 10.2.3 Damage due to overheating
- 10.3 Repair techniques for electrical trace heaters [Go to Page]
- 10.3.1 General
- 10.3.2 In-line splice
- 10.3.3 Connection via junction box
- 10.4 Earthing
- 10.5 Testing
- Annexes [Go to Page]
- Annex A (informative) Example of design data record
- Table A.1 – Example of design data record
- Annex B (informative) Checklist for installation requirements
- Table B.1 – Example of pre-commissioning check and trace heater installation record
- Annex C (informative) Example of trace heater commissioning record
- Table C.1 – Example of trace heater commissioning record
- Annex D (informative) Example of maintenance schedule and log record
- Table D.1 – Example of maintenance schedule and log record
- Annex E (informative) Pipe heat loss considerations – Heat loss formula and example calculations
- Figure E.1 – Assumed temperature gradients
- Annex F (informative) Vessel heat loss considerations [Go to Page]
- F.1 General
- F.2 Insulation heat loss (Qins)
- F.3 Slab surface areas (Qslab)
- F.4 Support heat loss (Qsupt)
- F.5 Manhole heat loss (Qmanhole)
- F.6 Convection coefficient formulae [Go to Page]
- F.6.1 General
- F.6.2 Free convection, nonfluid surface, any orientation (hi, hco, ho)
- F.6.3 Forced convection, any orientation (h0)
- F.6.4 Radiation component, all coefficients (hf, hi, hco, ho)
- Annex G (informative) Heat up and cool down considerations [Go to Page]
- G.1 Heat up
- G.2 Cool down
- Annex H (informative) Method to determine equivalent thicknesses of insulating cements
- Bibliography [Go to Page]
