Pop-A-Plug® Mechanical Tube Plugs

What Are Mechanical Tube Plugs?

Mechanical tube plugs can be installed directly into the bore of a leaking or damaged heat exchanger tube. A torque-controlled tube expander tool expands the plug against the inside wall of the tube, which creates an extremely tight seal at the tube’s inner diameter. During installation, the plug is positioned inside the tube and expanded against the tube's inside diameter. This creates a mechanical seal that isolates the affected tube from the system.

Mechanical tube plugs are particularly useful for maintenance and outage applications because the plugged tube can remain isolated while the rest of the equipment continues operating within its designed parameters. Depending on the plug configuration and application, mechanical tube plugs can also be removed when future inspection, maintenance, or tube replacement is required.
 

Mechanical Tube Plugs vs. Other Tube Plug Types

The appropriate tube plug depends on the equipment design, operating conditions, tube material, pressure and temperature requirements, and whether the plug may need to be removed in the future.

Mechanical Plugs vs. Driven (Tapered) Plugs

Driven, or tapered, tube plugs are installed by forcing a tapered plug into the tube using impact. Mechanical tube plugs use controlled expansion to establish the seal. Mechanical plugs may provide advantages where controlled installation and future removal are important considerations. The installation method also avoids the impact associated with driven plugs. 

Mechanical Plugs vs. Welded Plugs

Welded tube plugs require a welding process and introduce hot-work considerations into the repair. Mechanical tube plugs are installed without welding or heat, making them a practical option for applications where hot work is undesirable, restricted, or would add complexity to an outage or maintenance activity.

Mechanical Plugs vs. One-Piece Expansion Plugs

One-piece expansion plugs and mechanical tube plug systems are designed for different application requirements. Mechanical tube plug systems are available in configurations engineered for demanding industrial service, including applications requiring higher pressure capability and controlled installation. Plug selection should always be based on the equipment's operating conditions and the manufacturer's published ratings.

Mechanical Tube Plug Specifications

Selecting the correct mechanical tube plug requires more than simply matching the tube diameter. The plug must be compatible with the equipment's mechanical and operating conditions. Important specifications include:

Pressure Rating: Mechanical tube plugs are available in different pressure-rated configurations. The selected plug must be rated appropriately for the maximum pressure the isolated tube may experience.

Temperature: The plug material and configuration must be compatible with the operating temperature of the equipment. Temperature capability should be evaluated together with pressure and material compatibility.

Material Compatibility: Mechanical tube plugs are available in a range of materials to accommodate different tube and tubesheet materials. Standard material options include:

• Brass

• Carbon Steel

• 316 Stainless Steel

• 304 Stainless Steel

• 4142 Alloy

• 70/30 Cu/Ni

• 90/10 Cu/Ni

• Monel

• Duplex 2205

• Chromoly Grade 11

• Chromoly Grade 22

• Titanium

Material selection should account for the tube alloy, tubesheet material, operating environment, corrosion considerations, and galvanic compatibility.

Tube Inside Diameter: Mechanical tube plugs are sized according to the tube's inside diameter. Accurate measurement is critical to selecting the correct plug. A Go/No-Go gauge is included with each Pop-A-Plug® kit to verify tube size before installation.

Tube-to-Tubesheet Joint: The existing tube-to-tubesheet joint should also be considered when selecting a tube plug. Applications may include rolled, welded, or other tube-to-tubesheet configurations.

Installation Method: Pop-A-Plug® mechanical tube plugs are installed using controlled torque and the appropriate installation equipment. Proper installation procedures help ensure the plug is expanded according to the manufacturer's requirements.
 

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Mechanical Tube Plugs for Heat Exchangers & Condensers

Heat exchangers and condensers can experience tube failures caused by corrosion, erosion, vibration, thermal cycling, fouling, and other operating conditions. When an individual tube develops a leak or must be removed from service, plugging can isolate the affected tube while allowing the remaining tube bundle to continue operating. Mechanical tube plugs are commonly used for:

• Heat exchanger tube leaks

• Condenser tube leaks

• Boiler tube isolation

• Planned maintenance outages

• Emergency tube repairs

• Tube bundle maintenance

• Temporary tube isolation

• Long-term tube isolation, where appropriate

For critical equipment, plug selection should be based on the actual operating pressure, temperature, tube material, tube ID, and equipment configuration.

Mechanical Tube Plugs for Boiler Applications

Boiler tube plugging requires careful consideration of operating pressure, temperature, tube material, and accessibility. Mechanical boiler tube plugs can be used to isolate selected tubes when replacement cannot be completed during the current maintenance window or when a tube must be removed from service. EGI can help identify the appropriate plug configuration and installation equipment based on the boiler's tube specifications and operating requirements.

Mechanical Tube Plugs for Industrial Maintenance & Outages

During a plant outage, tube plugging speed and installation repeatability can have a direct impact on maintenance productivity.
EGI supplies mechanical tube plug systems for industrial facilities and maintenance contractors serving:

• Power generation

• Oil & gas

• Petrochemical

• Chemical processing

• Refining

• Industrial manufacturing

• Commercial and industrial HVAC

• Boiler operations

• Heat exchanger maintenance

From individual replacement plugs to complete Pop-A-Plug® kits and installation equipment, EGI can support planned maintenance and time-sensitive tube plugging requirements.

Pop-A-Plug® Mechanical Tube Plug Systems

EGI supplies Curtiss-Wright EST Group Pop-A-Plug® mechanical tube plug systems for industrial tube plugging applications. Pop-A-Plug® systems are designed around controlled mechanical expansion and are available in a range of tube sizes, materials, and configurations.

Each kit includes a Go/No-Go gauge for tube-size verification. Brush kits, installation tools, and other accessories are also available to support the tube plugging process.

Learn More About Pop-A-Plug® Tube Plugs
 

Ordering Information for Mechanical Tube Plugs

Equipment Group International supplies Pop-A-Plug mechanical tube plug systems that provide superior sealing in high-pressure environments. Pop-A-Plug tube plugs are available in a full range of standard materials and tube sizes, and are used across power generation, oil and gas, chemical processing, and other rugged industrial environments. Each kit includes a Go/No-Go gauge for plug sizing verification. Brush kits and installation equipment are available separately.

Ordering Information for Pop-A-Plug Mechanical Tube Plugs

To help determine the appropriate mechanical tube plug for your application, provide the following information:

• Tube O.D. and wall thickness, or measured tube I.D.
• Tube material and/or tubesheet material
• Maximum operating pressure
• Operating temperature
• Tube-to-tubesheet joint type — rolled, welded, etc.
• Equipment type — heat exchanger, condenser, boiler, etc.
• Required installation access or reach
• Quantity of tubes requiring plugging

Providing complete application information allows EGI to help identify the appropriate plug material, size, pressure rating, and installation configuration.
 

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Standard Material Options for Pop-A-Plug® Mechanical Tube Plugs

The suffix Q in the Pop-A-Plug® part number identifies the plug material.
Replace Q with the applicable material designator:

Designator	Material
B	Brass
C	Carbon Steel
S	316 Stainless Steel
E	304 Stainless Steel
A	4142 Alloy
H	70/30 Cu/Ni
N	90/10 Cu/Ni
M	Monel
D	Duplex 2205
F11	Chromoly Grade 11
F22	Chromoly Grade 22

 

Titanium: Titanium plugs use a different tube I.D. range. Consult EGI/factory for applicable ranges.

Pull Rod Assembly Lengths

The YY suffix in the Pull Rod Assembly column identifies the channel-head extension length in feet.
Available extension lengths include:

• 01 — 1 foot / 304.8 mm

• 02 — 2 feet / 609.6 mm

• 03 — 3 feet / 914.4 mm

• 04 — 4 feet / 1219.2 mm

• 06 — 6 feet / 1828.8 mm

Select the extension length based on the channel-head configuration and required installation reach.

Why Choose EGI for Mechanical Tube Plug Systems?

EGI combines tube tooling expertise, product availability, and technical support to help customers select the right tube plugging solution for demanding industrial applications.

Product & Application Expertise: EGI understands the relationship between tube dimensions, materials, pressure requirements, equipment configuration, and installation tooling.

Industrial Inventory: EGI supports maintenance contractors and industrial facilities with tube plugs, tooling, accessories, and related equipment for planned and emergency applications.

Technical Support: From identifying the correct plug size to selecting installation equipment, EGI can help customers evaluate the requirements of their tube plugging application.

Complete Tube Tooling Solutions: Mechanical tube plugs are one part of a complete tube maintenance solution. EGI also supplies tube expanders, tube installation tools, tube testing equipment, rental tooling, and service support.

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Contact EGI for Mechanical Tube Plug Systems

When a leaking or damaged tube needs to be isolated, selecting the right plug is critical. Contact EGI for assistance identifying the appropriate mechanical tube plug, material, size, pressure rating, and installation equipment for your application. Contact EGI or request a quote to get started.

EGI provides mechanical tube plug systems and industrial tube tooling backed by application expertise and technical support.