Section 2: Mechanical installation | Daniel 3818 LNG Liquid Ultrasonic Meter Installation Manual |
May 2012 | |
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EXPLOSION OR FIRE HAZARD
Read and follow the instructions below:
•Conduit runs must have a sealing fitting within 457mm (18 inches) of the enclosure to reduce the risk of an explosion or a fire.
•During operation, keep covers tightly closed. DO NOT open the transmitter electronics enclosures when an explosive atmosphere may be present.
•During equipment maintenance, disconnect power before opening the transmitter electronics enclosures. Clean cover joints before replacing.
•DO NOT substitute meter components. Substituting components may compromise the intrinsic safety of the device.
Failure to follow these safety instructions may result in severe injury to personnel or cause damage to the equipment.
2.3Piping recommendations
Recommendations for best measurement results:
•Honed or
•Flow direction (unidirectional or bidirectional)
•Correct meter size selection - too low may cause poor flow stability (thermal convection) or too fast may cause erosion problems and resonance, cracks or failure of probes or thermowells (approximately .6 to 12 m/sec or 2 to 40 ft/sec).
•Space availability for meter lengths (to allow inlet piping customization)
•Concentric alignment pins or flange concentricity technique considerations
For optimal flow measurement conditions, Daniel suggests the piping configurations below. Regardless of the configuration selected, the user agrees to accept full responsibility for the site piping design and installation.
18 | Piping recommendations |