NDT Inspection Plugs

NDT Inspection Plugs

Nondestructive Testing (NDT) Inspection Plugs for monitoring Corrosion under Insulation (CUI).

NDT Inspection plugs allow testing on insulated pipe, pipeline equipment, storage tanks, pressure vessels and pipelines for petrochemical, oil and gas, steam and nuclear power generation.

Removable inspection plugs (ports / seals) allow repeated access in hazardous environments, specified to provide durability, reliability and long-life.

Engineered for EPA/OSHA Process Safety Management and Mechanical Integrity testing.

Inspection Plugs seal the testing access point with #5052 Aluminum or #304 Stainless Steel metal cap.

Standard material includes EPDM sleeve, metal handle w/lanyard and locking ring:

  • Protects against Corrosion Under Insulation (CUI)

  • Chemical and UV Exposure Protection, Ozone and Weather Resistant
Internet Orders Ship Free
Inspection Plug Installation
Inspection Plug Diameters

NDT Plug Sizes as Diameters:

1.5″ | 2.5″ | 3.0″ | 5.0″
(38, 64, 76, 127 mm)

Inspection Plugs can be installed on smooth or corrugated insulated jacketing.

Aluminum and Stainless Plugs ship standard w/EPDM sleeves, locking ring and lanyard for insulated seal.

Installation thru Insulation


Locate and mark the insulation jacket where the inspection plug will be installed:

  • Hole saws are best to penetrate the insulation jacket, cut a circumference equal to the plug to be installed.
  • Use either tin snips or a holesaw to penetrate the insulation jacket with a diameter equal to the size of the Inspection Plug.
  • Remove the insulation to expose the substrate for inspection.
  • After inspection, re-insert the insulation or replace it with a high-density material.
  • Insert the EPDM or Silicone Sleeve.
  • Install the Inspection Plug Locking Ring and Lanyard if equipped.
  • Insert the metal cap to create a seal

Note: Caulking around sleeve for cold weather applications recommended

TML / UT Inspection Point Labels

TML / UT Point Labels

Test Measurement Location (TML) +
Ultrasonic Testing (UT) Point Labels

TML / UT Access Point Labels
ID inspection point locations.

250) labels per roll.

Note: Acrylic adhesives require 48-72 hours to achieve 90% of its ultimate bond strength for best performance.

Label Application

The minimum application temperature for acrylic adhesive is 58°F (15°C).

Clean and dry the application surface for maximum bond strength.

The surface should also be free of loose particulates, such as dust, dirt, and corrosion.

Note: Acrylic adhesive requires 48-72 hours to achieve 90% of its ultimate bond strength.