APF Fugitive Emissions Monitoring Inspection Plugs

APF Fugitive Emissions Monitoring Inspection Plugs

Temp Range: 33 to 500 °F. Most Reliable and Insulation Efficient Inspection Port on the Market

Extended Hours of Safe Production

With the need to monitor emissions at insulated flange type connections for pipelines, valves, and equipment; Access Plug Flange offers an inspection port that helps monitor for fugitive emissions, 33 to 500 °F, on these high capital control connections. Access Plug Flange inspection ports are designed with the largest sealing area in the industry to provide the most reliable and insulation efficient inspection port on the market today. Installation is quick and safe because they attach to the jacketing surface and not to the cut edge, providing a multitude of benefits. By using an inspection port within the listed operating temperatures, if the insulation material inserted after installation is lost or discarded, the integrity of the system is protected.


Sealing and Insulation Mechanism

  • Outer Seal 1, silicone under flange primary holding and sealant to jacketing
  • Outer Seal 2, red silicone rubber plug for weather-tight barrier
  • Foam spacer maintains thermal efficiency

Red FEM Inspection Port

  • For insulated flange type pipe connections and valves.
  • Attaches to pipe jacketing; silicone under flange and red silicone plug are barriers for fugitive emissions.
  • Foam spacer maintains thermal efficiency.
  • Process temperature range 33 to 500 °F
  • Large silicone seal area under flange eliminates for jacketing cutout errors during installation, provides long-term water & fugitive emissions proof seal, and largest holding power in industry.

Access Plug Flange Benefits

  • Stainless steel safety line with molded-in washer for strain relief to protect against plug loss
  • One-handed removal of the silicone plug with the aid of the molded seal braking tab
  • Extension tube, for cryogenic services, to protect against air migration under insulation
  • Optional extension sleeve is available to help with insulation separation from testing area
  • Offers a wide range of inspection ports to allow you to match your inspection ports to your process temperature
  • No Hot Work Permit needed, meaning less installation costs, less risk of damage and installation can be performed while the unit is in production
  • Protection against packeting expansion / contracting


Access Plug Flange Application & Industries

APF's product offerings are used in many different industries ranging from petrochemical and refining to food processing and pharmaceutical. Their extensive product offerings and large global installed base in these various industries demonstrate their customers' confidence in choosing Access Plug Flange products. Industries include:

  • Petrochemical
  • Refining
  • Pulp and Paper
  • Food Processing
  • Pharmaceutical
  • Chemical

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.



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.

Step 4

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

Step 4.1: Perform the following options prior to next step if applicable:

- 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.

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"
5" 5"

Note: There is a $25 small order fee for orders under $100

Description Part # Saved Price Select Option Add to
2 1/2 Access Plug Flange FE Assembly, Aluminum Flat Flange, Red Silicone Access Inspection Plug w/Copper Sleeve, 6" OAL. Temp Range: 33-500 °F CUI-APF-FE1 Request Pricing