Information Topics

We have assembled a number of articles that provide information on a variety of topics that relate to the use of Vipertex® enhanced surfaces in heat exchanger applications.

Retrofitting with Vipertex® to Resolve Bottlenecks

Increase Output Without Bricks and Mortar Investment

Improved Burst & Collapse Performance

Pattern Optimization for Specific Applications

Articles Found on Our Blog

Economic and Environmental Analysis of Enhanced Heat Exchanger Designs

Fouling Results of Vipertex® 1EHT Tubes in Crude

Condensation and Evaporation Characteristics of Flows Inside Three Dimensional Vipertex® Enhanced Heat Transfer Tubes

Heat Transfer Correlations for Condensation in Three Dimensional Surface Enhanced Heat Transfer Tubes

Experimental Study on Heat Flux Effect on Evaporation in Two Dimple-Grooved Tubes

ASME Code Case 2877 Details the Design of Heat Exchangers Using Vipertex® Tubes

Evaluation of Heat Exchanger Designs Using Enhanced Heat Transfer Tubes

Geometric Optimization for Thermal-Hydraulic Performance of Dimpled Enhanced Tubes for Single Phase Flow

Vipertex® Tubes Produced Under ASTM 1098

Experimental Study on Condensation and Evaporation Flow Inside Horizontal Three Dimensional Enhanced Tubes

Comparison of Heat Exchanger Designs Using Vipertex® 1EHT Enhanced Heat Transfer Tubes

To start a conversation with the Vipertex® team, click here.

Retrofitting with Vipertex® to Resolve Bottlenecks

A common thread that exists within the process industries is the reality of bottlenecks. Despite the best planning, process manufacturing operations, over time, experience changes in product mix and improvements in individual unit efficiency that create a situation where a given process unit becomes the pinch point that limits the facility's output. By definition, a bottleneck is created.

Because of the exemplary heat transfer efficiency of Vipertex® enhanced surfaces, there is an opportunity in most cases to retrofit heat exchangers with Vipertex® components to resolve bottlenecks. Theoretically, replacing a smooth tube with a Vipertex® tube in the heat exchanger, will at least double the output. This multiple can be as much as five times based on certain operating conditions where the heat transfer improvement is that much greater.

The economic value of bottleneck resolution can be substantial. It is prudent for operators of industrial process heat exchangers, and the suppliers who build and support these installations, to investigate the value of a Vipertex® installation. To start a conversation with the Vipertex® team, click here.

Increase Output Without a Bricks and Mortar Investment

Building a new plant is a big decision that has many benefits, as well as drawbacks. On the upside, you can optimize layout and define optimal capacity, taking advantage of the latest technologies, to have a truly up-to-date, efficient facility.

On the downside, it takes a long time to take advantage of a brand new plant's capacity and in the process industries, the permitting process can be extraordinarily complicated and time consuming. Perhaps there is an opportunity to review existing operations and consider ways to increase output within the confines of the existing facility. If heat exchangers are in the field of opportunity, as they very often are, Vipertex® can help.

Vipertex® enhanced surfaces can increase heat transfer as much as fivefold, compared to smooth tube. Vipertex® flat rolled patterns provide increased surface area and can add a heat transfer function, as well. Using Vipertex® as part of your existing plant expansion strategy can help you:

  • Realize revenue from new capacity faster than a Greenfield site
  • Preserve capital for other investment opportunities
  • Use less energy per unit produced
  • Payback for these enhanced tubes is typically less than 18 months

To start investigating how Vipertex® can help you expand your operation, click here.

Improved Burst & Collapse Performance of Vipertex® Enhanced Tubes

Vipertex® tubes are welded from pre-textured strip, which is engineered to provide enhanced heat transfer. A collateral benefit of this texture is a strengthening of the material, which leads to a stronger tube. More homogeneous properties are present since Vipertex® tubes are annealed after the surface pattern is imparted. Burst and collapse pressure test results have demonstrated an approximate 20% improvement as referenced in the tables below.

Burst Pressure Measurements (psi) for SS304L Welded Tube with a 0.75" (19.05mm) OD and a 0.035" (0.889mm) Wall Thickness
Sample Plain, Smooth Tube Vipertex® Pattern 1EHT Tube
Average Burst Pressure6,78210,582

Collapse Pressure Measurements (psi) for SS304L Welded Tube with a 0.75" (19.05mm) OD and a 0.035" (0.889mm) Wall Thickness
Sample Plain, Smooth Tube (Estimate*) Vipertex® Pattern 1EHT Tube
Average Collapse Pressure2,6693,694

*Collapse pressure estimate shown is per API 5C3 calculation.

To start investigating how Vipertex® can benefit your application, click here.

Pattern Optimization for Specific Applications

Vipertex® enhanced surfaces are produced in a selection of patterns, which were developed with specific purposes in mind.

  • For most applications, our 1EHT surface will provide the best solution. It has been engineered to provide enhanced thermal transfer through increased surface area, in addition to surface patterns that promote turbulence and nucleation sites.
  • 2EHT provides a surface absent of dimples to accommodate applications requiring simpler geometry, as in the case of very small diameter tubes.
  • Single phase flow studies and bundle testing studies performed at HTRI® for 1EHT and 2EHT tubes.
  • Our new herringbone (HB/EHT) and helix (HX/EHT) patterns, currently in development, are engineered surfaces that are optimized for certain condenser tube applications.

It is possible to accommodate minor adjustments to these patterns to optimize them for your specific application. If it becomes important to develop a completely unique solution that goes beyond adjustments to an existing Vipertex® pattern, it would have to be reviewed as a development project with adequate volume associated with the opportunity to justify the development costs.

1EHT in Stainless Steel
2EHT in Stainless Steel
1EHT/MT in Titanium
HB/EHT in Stainless Steel
HX/EHT in Copper

To start investigating how Vipertex® can benefit your application, click here.