Sierra 241-VTP, 240-VTP instruction manual Wafer-Style Flow Meter Installation

Chapter 2 Installation Series 24-HP Instruction Manual

Wafer-Style Flow Meter Installation

Caution! When using toxic or cor- rosive gases, purge the line with inert gas for a minimum of four hours at full gas flow before installing the flow meter.

Install the wafer-style meter between two conventional pipe flanges of the same nominal size as the flow meter. If the process fluid is a liquid, make sure the meter is located where the pipe is always full. This may require locating the meter at a low point in the piping system. Note: Vortex flow meters are not suitable for two-phase flows (i.e., liquid and gas mixtures). For horizontal pipelines having a process temperature above 300° F, mount the meter at a 45 or 90-degree angle to avoid overheating the elec- tronics enclosure. To adjust the viewing angle of the enclosure or dis- play/keypad, see page 2-17.

Figure 2-3. Wafer-Style Flow Meter Installation

When installing the meter make sure the section marked “inlet” is positioned upstream of the outlet, facing the flow. This ensures that the sensor head is positioned downstream of the vortex shedder bar and is correctly aligned to the flow. Installing the meter opposite this direction will result in completely inaccurate flow measurement. To install the meter:

1.Turn off the flow of process gas, liquid or steam. Verify that the line is not pressurized. Confirm that the installation site meets the re- quired minimum upstream and downstream pipe diameters.

2.Insert the studs for the bottom side of the meter body between the pipe flanges. Place the wafer-style meter body between the flanges with the end stamped “inlet” facing flow. Center the meter body inside the di- ameter with respect to the inside diameter of the adjoining piping.

3.Position the gasket material between the mating surfaces. Make sure both gaskets are smooth and even with no gasket material extending into the flow profile. Obstructions in the pipeline will disturb the flow and cause inaccurate measurements

4.Place the remaining studs between the pipe flanges. Tighten the nuts in the sequence shown in Figure 2-2. Check for leaks after tightening the flange bolts

2-4 IM-24-HP