Analyzer Probe Insertion Force

[NewMechanicalEngr]

I am new to this website as well as engineering. I originally posted this last night to the Controls Engineering page, but am not sure if that was the best site. I have a specific question regarding inserting a sample probe in a relatively high pressure line.

We have a 400 psig line that was hot tapped and valved. We now have a retractable probe that will mount to the 1-1/2" full port valve. After connecting the probe assembly, the valve will be opened. Then, the packing nut will be loosened so that the probe can be forced down into the pipeline. THe probe is 3/4" S160 316SS.

1) Any recommendations as to how to calculate the force needed to insert the probe? I am thinking the force needed to overcome the packing on the probe will be greater than the axial force needed to push the pipe into the pipeline. Any advice?

2) Are any of you familiar with a device that would be mounted on the probe that would be used as a safety/inertion device? We are looking to make this a safe device. We do not want the probe shooting out after the packing nut is loosened. We do have an "end stop" on the probe, but don't really want to find out if it works!!!

Any help, advice, info, etc would be greatly appreciated.

 

[unclesyd]

Here is one of the providers of equipment for online coupon testing. I would suggest that you purchase one designed for your process parameters.
One device is saftey chain or cable attached to the probe. and anchored to the valve. s I have never seen a process probe without a safety chain or wire unless it had yoke on it.

http://www.rohrbackcosasco.com/Cosasco.aspx