Panametrics T17, Руководство по установке, Страница: 30 / 76

Chapter 2. Installing Pipe Nozzles
18 Model T17 Installation Guide
2.3.2 Selecting and Marking the First Nozzle Location, Non-Diametrical, Mid-Radius
1. For optimum performance, you should select a location that has at least 20 pipe diameters of straight,
undisturbed flow upstream and 10 pipe diameters of straight, undisturbed flow downstream from the
measurement point. Undisturbed flow means avoiding sources of turbulence such as valves, flanges, elbows;
avoiding swirl; and avoiding disturbed flow profiles.
2. We recommend that you install the nozzles on a chord as near as possible to the horizontal plane for horizontal
pipe.
Note: If you cannot find a proper location, please consult with Panametrics Flow Application engineering.
CAUTION!
Correct nozzle alignment is critical to the successful operation of the flowmeter;
therefore, all marking, positioning and welding operations must be carried out with the
utmost attention to accuracy. Unless otherwise stated, dimensional positioning of the
nozzles must be held to a tolerance of

1/16 in. (±1.6 mm) relative to each other and with
respect to the pipe centerline. the angular tolerance must be held to

1
O
.
All hole cutting in process piping must be performed using hot tapping equipment.
FLOW
NOZZLE
2 PLACES
10D 20D
D
45°
TOP VIEW
END VIEW
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