Thermo Scientific Sarasota FD900, Руководство пользователя

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Installation
2-12
User Guide for Sarasota ID900, FD900, & PD900 Gas Density Meters Thermo Fisher Scientific
Sarasota PD900
2. Thermally bond the bypass tubing to the exterior surface of the
pipework using a thermal conducting paste. Pipework scale shouldbe
removed. Also, remember access will be required for servicing.
Pressure
Considerations
Pressure changes will occur in the bypass line due to the piping, filter, and
valves. The pressure changes will be proportional to the flow in the bypass
and can be made to be insignificant. This is further described in the chapter
on commissioning.
Dirt Consideration
Even with “clean” fluids, it is best to install a filter upstream of the meter.
A self-cleaning filter or a type which allows quick replacement of a cartridge
is recommended.
Pocket Location &
Installation
Each pocket location should be treated as a unique case and reference made
to the relevant pipeline codes of practice. The presence of the pocket
should not disturb the flow pattern at the orifice plate. See BS1042 Part
1:1981 for guidance on suitable locations.
For best operation of the instrument, the thermowell pocket and density
meter should be mounted on top of a horizontal pipeline so as to be within
±5° of the vertical. At the selected location a 3” (7.6 cm) ± 0.05” diameter
hole is required through the pipe wall to accept the pocket.
To install the pocket, follow the steps below.
1. Insert the pocket as far as possible into the pipe while leaving sufficient
room to make a good weld. Welds on the pocket must be made on the
thicker upper section.
2. Align the pocket as shown in the figure below.
3. Tack weld at positions 1, 2, 3, and 4.
4. Fillet weld between 1 and 4.
5. Fillet weld between 3 and 2.
6. Fillet weld between 3 and 1.
7. Fillet weld between 2 and 4.