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Inspection Port Installation & Testing

Match Your Inspection Ports to Your Process Temperatures

APF Inspection Port Assembly Standard Installation Instructions

Installation consists of six steps with exceptions to the optional field contour, extension sleeve, and transition gasket. Also, cryogenic inspection port follows a different installation procedure for the flange installation as shown below the standard installation procedures. Click here to see the installation advantages.

STEP 1 - Using the flange for sizing, locate and mark the ID of the flange on the jacketing surface at the test point location.

STEP 2 - Using a sharp utility knife or similar device, score the jacketing along the traced outline and pierce the jacketing with a small hole for the snips.

STEP 3 - Use a pair of snips to remove the jacketing. ** NOTE ** If you wish to use a hole saw to remove the jacketing, please refer to the chart below for sizing.

Hole Saw Sizing Chart

APF ID [in]Hole/Drill Dia. [in]
1 3/4"1 9/16"
2 1/2"2 9/16"
4"4 1/8"

STEP 4 - Using the correct tool for your specific insulation material, remove the insulation as required to expose the pipe/vessel surface.



** Field Contour the flange for small diameter piping if needed.

** Install the Separation Sleeve at this step if needed.

** Install the Transition Gasket if needed.

STEP 5 - Fill the backside of flange with a high grade silicone adhesive and insert the flange into the cut hole to shield the cut edge.


Use the silicone injection holes along the face of the flange to fill any voids and to make sure you have an airtight seal between the flange and the jacketing.

STEP 6 - Install two (2) #10 self-tapping stainless steel screws across from each other to hold the flange in place while the silicone cures. Make sure one of the screws is used to attach the safety line to the flange.


**NOTE: Installers may want to use aluminum or stainless steel pop rivets in lieu of self-tapping screws as an alternate fastening method. Insert an insulation core into the inspection hole and secure the stopper in the flange. If you are installing our high temperature, all metal, inspection ports; make sure the cup in fully engaged with the locking tabs to create the seal.

Installation Videos for APF Inspections

Standard Service Applications

HT2 Applications

Foam in Place Applications

HT1 Applications

Cryogenic Applications

Fugitive Emissions Applications

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