Sierra Instruments, Inc.

Guide to InnovaMass Vortex Flowmeter Retractor & Hot Tap Insertion - Video

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Learn how to easily install, remove and operate the InnovaMass 241i iSeries insertion vortex flowmeter retractor in a typical hot tap installation application in this technical training video. We also explain the technic and formula used to assure you always know how far down to insert the probe to assure the sensor head is in the center of the pipe.
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This is our newly designed retractor, compact and ergonomic. It's accessible from both the top and bottom with any tool that has a quarter-inch ratcheting feature. Just a hand ratchet, power drill with a quarter-inch ratchet adapter.

We're here today on a six-inch schedule 40 pipe, this would be a typical hot-tap installation.

This weldolet's been welded into the pipe. We added a two-inch flanged adaptor. This is a two-inch isolation ball valve. We have our 241i insertion meter with a packing gland, two-inch flange packing gland adaptor. A big wrench to actuate the valve. Most important tool for installation is a 5/16-inch hex driver, which I'll use to install the mounting brackets.

The retractor's secured to the process connection and probe with these two brackets. Each one is uniquely machined, so that it'll only fit one way.

Unlike some retractors on the market, we've gone with a sleek, compact design. You can orient it any way you want. The last thing I need to do is get this bracket indexed properly by moving it up until it butts up against the flow pointer. I'm going to slowly move it up until it hits the flow pointer.

My top bracket is pressed all the way up against the flow pointer. I'm going to tighten it down. Right now the probe is sitting somewhere between the two flanges and the ball valve. I've already taken the time to mark that point on the meter. I know that when this top bracket is up to this point right here, that the unit is up above the ball valve. I can close the ball valve and then pull it out. When I actuate it down to the proper insertion depth, it's going to lower the probe down into the center of the pipe.

How do I know how far down to insert the probe to ensure that the sensor head is in the center of my pipe? Use our formula we use to figure out insertion depth (watch video). It's important to note when inserting into pipes greater than 10 inches, that instead of trying to get to the center line of the pipe, we want to insert five inches down. In those cases, you replace your R value with five inches. And that's clearly stated in the manual. We've calculated our insertion depth, 16.69 inches.

That insertion depth is going to represent the bottom of our packing gland to the bottom of the pointer nut. You can reference page 22 in the manual to see this diagram.

We've got a probe, process connection, retractor, and a tape measure. It's important when you're going to mark the retractor for the insertion depth to know that the measurement begins at the bottom of whatever your process connection is. In this case, we've got a flange process connection. I start my measurement here. I go up to my number, which is 16.69, and I'm going to make a little mark there. I made a small mark, I'm going to take one of these post-it notes and put it on my mark. That's going to represent the point where I need to bring this bracket down to.

The retractor's oriented in a way that's easy for me to access. My isolation valve is closed. Right now this packing gland is tightened. I've checked my flow pointer to make sure it's in the right direction. I'm ready to insert this probe.

First step is to open my isolation valve. Next, loosen the nut on the packing gland to ensure that the probe can move easily up and down. I've got my power drill here, quarter-inch ratchet adaptor. Depending on the pressure of your system, you might have to use a different tool or a heavy duty tool. I'm going to slowly lower it while watching the top bracket. When it gets to my green mark there, I'm ready to stop my probe. I'm going to probe to the middle of the pipe.

I lowered it until the top of the bracket is at my mark, which tells me that my probe has been inserted so that the head is in the center of this pipe. I'll check the flow barrel again, make sure it didn't move side to side too much. I can tighten my packing gland.

You can use one retractor for many units. I'm going to remove this retractor and take it to the next unit. Remove the bracket, clip that off, and I'm ready to go to the next unit.

It was really great to show you guys Sierra's new insertion retractor. This thing's easy to get to and operate. All it takes is some off-the-shelf tools you can find at any hardware store.

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