Operation & Installation Manual V12-V6 2010-05-31.doc
31/05/2010
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Humidity: < 95 % RH (closed and heated storage area)
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Storage temperature: -40…+65°C / -40…+149°F
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Avoid direct solar radiation during long storage periods, store under a sunshade
For carbon steel meters or other materials that could suffer from corrosion , a specific point
of attention is the conservation of the inner pipe wall. Typical applications such as
measuring dry natural gas (sales quality) or natural gas with a corrosion inhibitor do not
require an anti corrosion coating inside the meter tube. A coating can even be regarded as
unwanted because it may wear off, which could have an impact (although minor) on the
accuracy.
However for storage and/or transportation additional protective measure are recommended.
Depending of how long the protection should last one of several methods can be considered.
1.
Protection by a light oil (WD40 or an equivalent product) for a short period of time
(max. 2 weeks): The oil does not dry and as such it can not be used for a long period
of time. Do not apply oil on the sensors. Later it can be removed with cloth and a
solvent.
2.
Protection by Tectyl or similar product for a longer period (few moths): The Tectyl
dries and gives a longer protection. The it can be removed using solvent and cloth.
Also do not apply onto the sensors
3.
Protection by oxygen free environment (blind flanges and nitrogen): To protect
against corrosion the humidity should be less than 38% and/or oxygen should not be
present. Place some bags of silica gel inside the meter. Mount blind flanges (can be
a special type low pressure rating made of plastic), flush with nitrogen (approx. 5
times the volume of meter).
Also first a vacuum pump can be used to remove air. This option results in a slightly
pressurised flow meter. Special regulation may be applicable for transportation and
storage of pressurised equipment.
3.3 Environmental Requirements
NOTE!
The equipment is designed for safe operation under conditions according to the following
classifications:
•
Pollution degree 2: This means normally only nonconductive (dry) pollution will
occur, Temporary conductivity caused by condensation is to be
expected.
•
Protection class I:
This means the equipment should be earthed.
•
Humidity: < 95 % RH
•
Ambient temperature: -40…+65°C / -40…+149°F
•
Suitable for indoor and outdoor use
•
IP66 or NEMA 4X classification
NOTE!
Sun shade
Direct solar radiation introducing temperature gradients in the metering section shall be
avoided as much as possible. If required because of the climate, use a sunshade or canopy
over the flow, pressure and temperature transmitters for protection against direct exposure to
sunshine. Alternatively thermal insulation of the complete metering section including
transmitters can be applied as an option.
