Understanding wet-tap assemblies

My intent was to do a blogpost on the diaphragm style metering pumps with regards to pumping fluids that off-gas, but between customer emergencies, holidays, and all the new information I have received in my research, I just haven't been able to complete part 2. So the "Passing Gas" discussion may become a much longer segment than I originally anticipated. In the meantime, Steve Purucker was kind enough to do a write up on Wet-tap assemblies. So here you go:

Wet-Tap Assemblies

Wet-tap or Hot-tap sensor assemblies enable operators to safely remove and reinstall a sensor through a ball valve without interrupting the flow in a pipe.  They also allow the removal of sensors from the sidewall of tanks without the need to lower the liquid level.  This is very useful for applications that require periodic maintenance or calibration. 

Wet-tap assemblies require pipe shutdown for the initial installation.

Hot-tap assemblies can be installed without interrupting the flow.

Here are some examples of wet-tap assemblies from the George Fischer/Signet product line:

The Signet 3519 Wet-Tap Valve mounts directly onto standard Signet installation fittings. The 3519 Wet-Tap Valve consists of a flange and a support plate that threads onto the pipe fitting insert, and a PVC ball valve through which an extended length sensor is inserted into the pipe. It allows you to remove a paddlewheel flow sensor for cleaning or maintenance while the pipe is flowing.

The Signet 3719 pH/ORP Wet-Tap allows installation and removal of pH or ORP electrodes, even under process pressure, without the need for process shutdown during routine electrode maintenance and calibration. Automatic process isolation is achieved during electrode retraction with a double O-ring seal on a unique and compact retraction assembly; no separate valve is required.

Insertion magmeters can be used in pipes from 2” to 102” in diameter and can be inserted through a standard 1.5” coupling.  A full bore ball valve allows removal for cleaning without process shutdown.

Steve Purucker, PE has been a team member at Panner for more than 25 years.  His vast knowledge of all our product lines makes him a great resource.  Please feel free to contact him at 815-469-8333 if you have any questions.