Baker Hughes Panametrics PanaFlow LC, Руководство пользователя

Страница: 18 / 146

2.6 Precautions
Prior to installation the clamping fixture, it is HIGHLY recommended to keep the following in mind:
1. Position the clamp-on fixture(s) and transducer system so that there are at least 10 pipe diameters of straight,
undisturbed flow upstream and 5 pipe diameters of straight, undisturbed flow downstream from the measurement point
(see Figure 7 below). Undisturbed flow means avoiding sources of turbulence in the fluid such as valves, expansion joints,
elbows and other protruded mechanical components. For location after a set of out of plane double elbows, longer
upstream length is highly recommended.
2. If the clamping fixture is to be placed downstream of an elbow, the orientation of the clamping fixture must be placed in
such a way that the transducer path is perpendicular to the plane of the piping to compensate for swirl.
3. For permanent installations, the clamping fixture should be oriented in a way where the transducer paths are out of the
vertical plane. Pipe fouling can produce erroneous meter readings. If this placement contradicts with the placement
listed in the previous note, then the fixture can be oriented in the 11-5 o’clock or 1-7 o’clock positions. NEVER orient the
transducers in the 12 o’clock or 6 o’clock positions.
4. Once the location has been scoped out, make sure there is enough clearance around the area to install the clamping
fixture and transducers.
Figure 7: Recommended installation location and orientation
6