2019

The Forefront of New Exchanger Coatings

Curran International is at the forefront of new exchanger coating technology to reduce fouling in high-temperature crude and hydrocarbon manufacturing operations. Curran’s thin film application reduces surface tension of steel, leading to improved “release” down tube of exchangers in heavy crude and fouling services. Using hybrid polymers and inorganic components, Curran applications are suited for use in many crude and hydrocarbon services. This class of coatings covers wide operating parameters, including crude and coking services to 800ºF...



2018

Curran Clean™ Exchangers for Predictable NDE and No Rework

Curran Clean enables high-quality data collection for IRIS, RFT and ECT methods of exchanger inspections. Curran Clean is vacuum-tight containment solutions that eliminate nuisance dust and waste. Curran Clean means no tube cleaning rework! For over 15 years, clients have used Curran dry-grit tube cleaning that ensure their exchangers pass the most rigid inspections. A Midwest utility was having issues with a heavy and hard to remove layer of calcium carbonate (calcite) which had accumulated on the wall of their condenser tubes. Other companies, all using standard mechanical tube cleaning methods, had failed in numerous attempts to adequately clean this utility’s condenser tubes...


Specifying the Right Protective Coating for Worst-Case Conditions

When specifying an internal coating for fixed equipment in immersion service it’s important to understand the operating conditions, temperature, fluid exposure, and whether the equipment is insulated. But, not so fast – there are a couple of other factors to consider. Steam Cycling: In many refineries and petrochemical plants utility steam is often circulated through equipment as a routine maintenance practice. At clients we visit, 150 PSIG appears to be the typical utility steam circulated through product-side of cooling water exchangers and channels. This is about 365F, when converted to temperature. Even where steam is not circulated at the coated-surface...


Curran’s Plate and Frame Exchanger Coating Significantly Increases Thermal Conductivity

Scaling and fouling in plate and frame (PFE) heat exchangers results in significant loss of performance and negatively affects energy efficiency of the system. In severe cases, the buildup could be so thick that it results in a clogged exchanger – unable to be cleaned in place (CIP) with acidic cleaning techniques. This leads to production stoppages for cleaning and ultimately results in increased production costs. Recent studies from the chemical, district heating, oil and gas, and power plant industries have introduced compelling evidence that altering the surface of the plate with a thin layer of antifouling coating mitigates the buildup of fouling and, thus, reduces maintenance stoppage...



2017

Protect, Prolong Exchanger Service-Life Hydraulically Expanded Liners Restore Corroded Exchangers

From the time a heat exchanger is placed into active service external factors such as erosion, corrosion and mechanical issues immediately begin to directly affect the longevity of the heat exchanger components, especially the tubes. As issues manifest themselves and tubes begin to fail, the standard maintenance practice is to simply plug the failing tubes. As the tubes continue to deteriorate and fail, tube after tube is plugged until the percentage of plugged tubes necessitates either a retubing or complete replacement of the heat exchanger...


Tube-In Tube Liners Return Corroded Tubes to Duty with Very Minimal Downtime!

Curran International’s proven repair solution, using full length tube liners for a tube-in-tube repair, maintains tubes in-service – with very minimal downtime. Curran has executed liner installation during critical turnaround schedules. Using pre-ordered material, this repair strategy has been executed within a matter of work shifts. Exchanger tube ID corrosion, and tube damage may require that tubes are plugged and removed from continued service; or that repairs are made to maintain equipment integrity. When tube ID propagated corrosion has effected many tubes in a bundle, plugging tubes may not be an option...


Learn About Ultra-Thin, High Temperature Curramix 2500 Coating at NACE 2017

Curran will introduce a new tube ID coating technology for ultra-thin film exchanger applications, at NACE Corrosion 2017. This material is designed to provide state-of-the-art foul release performance in hydrocarbon and coking services where process foulant has a high impact to unit efficiency. Initial tests of Curramix 2500, a high temperature inorganic coating, have shown promising results in mitigating fouling in crude exchangers of distillation units...


A Once in-a-Generation Restoration

Power plant steam condenser tube replacement is a major, once-in-a-generation maintenance event. These can be large systems, each with a wide range of designed-capacities, depending on thermal demands. A Turnkey Solution Curran International offers a turnkey solution for condenser tube replacement projects. Curran becomes the single point of responsibility for performing re-tube, and application of epoxy coating systems. Curran’s qualified, multi-trade specialists have consistently demonstrated the craft-level competence required to lead these turnkey jobs...



2016

Hydraulic Tube Liners and Thin Film Tube ID Coatings Proven Technologies for Prolonged Heat Exchanger Tube Longevity

Applying a Curran thin-film coating to the ID of your heat exchanger tubes will provide you with more reliable heat exchangers that will provide additional years of active service. Tube Failure Starts on Day One From the time a heat exchanger is placed into active service, external factors such as erosion, corrosion and mechanical issues immediately begin to directly affect the longevity of the heat exchanger components, especially the tubes. As issues manifest themselves and tubes begin to fail, the standard maintenance practice is to simply plug the failing tubes. As the tubes continue to deteriorate and fail, tube after tube is plugged until the percentage of plugged tubes necessitates either a retubing or complete replacement of the heat exchanger...



2015

Ensure Fin Fan Operating Integrity with Multi-Method Approach to NDE

Verifying the tube integrity of fin fan air coolers is an important inspection task of NDE professionals; poor or incomplete inspection data may not detect all corrosion indications, risking an unexpected upset as a result of tube failure. The impact to safety, environment and operations usually requires immediate repairs, taking unit off line or even completely shutting down the unit. The value on high integrity inspections is clear. As you may know, there are several types of air cooled heat exchangers and different methods of examining them. This short article discusses the nondestructive examination (NDE) of a forced air exchanger with aluminum "L" finned tubes and plug header box...



2014

For Curran, It's Another Day at the Power Plant

More than 1000 tubes salvaged and returned to service. A 20% increase in surface area of a 4,800 tube condenser bundle. Plus, improvements in turbine back pressure and plant heat rate. Recently, a 50-year old condenser bundle was rehabiltated and given five more years of productive life. As part of a turnkey project performed by Curran International, more than 1,000 previously plugged tubes were returned to circulating water service – returning more than 20% of the operating surface area. A 50 megawatt steam condenser located at a power generation station in South America had been operating with an unusually high number of plugged tubes. In fact, about 42% of the bundle was plugged. This condition further compounded a number of known integrity issues with the unit’s steam boiler. Additionally, the severe corrosion across the tube sheet likely contributed to condenser circulating water leaks, which compromised steam purity and shell side integrity...