3-6
Chapter 3 Starting and Stopping this Device
3-2 Measurement Using the JTD Model
3-2-1 Flow Rate Measurement
(1) Preparing for Operation
(i) Important points
Warning
When clearing vents and drains, check the direction in which material will come out in
order to avoid any contact with the human body. There is a danger of scalding and other
harmful health effects. If the process fluid is harmful to the human body, take safety
measures such as wearing goggles or a mask so that it does not adhere to the skin or the
eyes, become inhaled, etc.
Caution
Check that the process is in manual control mode. If it is in automatic control mode, be
sure to switch it to manual control mode before starting work.
In terms of piping, before commencing operation of this device as shown below, the
differential pressure outlet valves (master valves), drain valves, gas vent plugs (see
Figures 2-30 and 2-31) and the stop valve of the three-way manifold valve must be closed
on both the high pressure and low pressure sides. In addition, check that the equalizer
valve of the three-way manifold valve is open.
(ii) Introducing process pressure and checking for leaks
In the following procedure, process pressure is introduced into the pressure-receiving part of this device.
Procedure
(1) Open the high and low pressure side master valves (see Figures 2-30 and 2-31), and introduce
process fluid into the connecting pipe. If the process temperature is high at this point, wait until
the connecting pipe cools down.
(2) Fill the pressure-receiving part of the device with process fluid.
(1) Gradually open the stop valve on the high pressure side. When it is filled with process
fluid, close the valve.
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