Baker Hughes Panametrics PanaFlow Z3, Руководство пользователя, Страница: 22 / 118

Chapter 2. Installation
10 PanaFlow Z3 User’s Manual
2.3 Site Considerations
Proper installation of the PanaFlow Z3 is important to achieve optimum performance from the system. The following
installation recommendations provide general guidelines of how this system should be installed. If the following
recommendations cannot be met, please consult the factory for a more detailed review of the application to see
what performance may be achievable. Following these recommendations may not be the solution for all, since every
installation is different.
2.3.1 Installation Location
2.3.1.1 Straight Run Requirements
Ideally, choose a section of pipe with unlimited access; for example, a long stretch of pipe that is above ground.
However, if the meter body is to be mounted on an underground pipe, dig a pit around the pipe to facilitate
installation or removal of the transducers. Locate the meter body so that there are at least 10 pipe diameters of
straight, undisturbed flow upstream and at least 5 pipe diameters of straight, undisturbed flow downstream from the
measurement point (see
Figure 9 ). Undisturbed flow means avoiding sources of disturbances like valves, reduced
bore valves, pipes, flanges, expander/reducer and elbows.
Figure 9: Flow Direction and Pipe Length
2.3.1.2 Transducer Location and Orientation
For a given fluid and pipe, the PanaFlow Z3's accuracy depends on the location and alignment of the transducers. In
addition to accessibility, when planning meter location, adhere to the following guidelines.
Locate the transducers on a common axial plane along the pipe (see Figure 10 ). Locate the transducers on the side
of the pipe, rather than the top or bottom, since the top of the pipe tends to accumulate gas and the bottom tends to
accumulate sediment. Either condition will cause increased attenuation of the ultrasonic signal. There are no similar
restrictions with vertical pipes if the flow of the fluid is upward to prevent free falling of the fluid or a partially filled
pipe.
Figure 10: Good and Bad Transducer Orientations