TaCORR – Program

11:00 AM

11:30 AM
Opening Remarks by 

Dr. Michael Renner (Biography)
(Managing Consultant / Asset & Corrosion Management)

TaCORR 2014 - Program

11:55 AM

On the Edge of Corrosion Resistance - Service Experience of Tantalum in Sulfuric Acid Concentration

Benjamin McCurry, PE (Biography)
Staff Materials & Inspection Engineer

Abstract: Tantalum possesses outstanding corrosion resistance to all concentrations of sulfuric acid up to approximately 98%. However, above the boiling point, careful control of the operational temperatures is essential to reduce the risk of accelerated corrosion and hydrogen embrittlement. This presentation will demonstrate the experience in sulfuric acid concentration processes where tantalum is used at the extreme limits of resistance and the effects of exceeding those limits.

12:20 PM

Development of better NDE for Tantalum Welds

Marc Cook (Biography)
Reliability Engineer
Dow Corning Corporation

Abstract: Despite the high cost and delicacy of Tantalum-lined equipment, the NDE methods currently available and in use to assess the quality of construction are ineffective and in many cases inferior to the NDE methods used on more common materials. The NDE techniques typically used on fabrication today include: visual examination, scratch testing, red dye Penetrant Testing and helium mass spectrometer testing. The sensitivity or reliability of these various techniques are often insufficient to identify weld defects that can cause a breach of the corrosion resistant lining in service and potentially result in unrecoverable damage to the equipment.
A project is currently underway to develop a procedure and propose acceptance criteria for the evaluation of Tantalum welds using radiographic techniques. Radiographic techniques can have several benefits including very high sensitivity, detection of subsurface indications and a permanent record of the inspection. Another advantage with radiographic techniques is that they provide an evaluation of indications on an individual basis, versus a “system test” of the entire liner like the mass spectrometer method of helium testing where small indications can hide inside the noise of the test. Consideration is being taken to ensure the methods developed for radiography of Tantalum linings can be employed in the fabrication shop environment by competent, local NDE contractors.

12:45 PM

Tantalum vs. Silicon Carbide Heat Exchangers - A Challenge for Tantalum?

Knut Boeminghaus (Biography)
Purchasing Director
Plinke GmbH

Abstract:  Tantalum heat exchangers are used in acid concentration plants mostly for heating the acids. Another challenge for the tantalum heat exchangers could also be found in areas where silicon carbide heat exchangers are used. An overview about the pro and cons between both systems is presented.

1:10 PM

Sulfuric Acid Concentration (SAC) Evaporator Design - Benefits of Glass Lined Steel & Tantalum

Todd Pollack (Biography)
Engineered Systems Business Unit Leader
DeDietrich Process Systems, Inc - USA (DDPS-USA)

Abstract: The SAC evaporator provides a case study in selecting the best materials of construction for both corrosion resistance & fabrication considerations. 

1:35 PM BREAK (15 min.)

1:50 PM

Explosion Clad – A Cost Effective Solution for Tantalum Process Equipment

Curtis Prothe (Biography)
Director of R&D, NobelClad - A DMC Company
DMC (Dynamic Materials Group)

Abstract: Tantalum is well known for two striking features: its exceptionally good corrosion performance in most aggressive chemical environments and its exceptionally high cost. On an equivalent weight basis, tantalum is about 300 times more expensive than basic stainless steels and 100 times more expensive than titanium. Consequently, tantalum’s viability as a practical corrosion resistant alloy in the monolithic form has been limited. Explosion cladding provides a method for reducing the cost of tantalum equipment. The first use of explosion clad tantalum equipment was in the early 1970’s. Equipment performance has been exceptional. However, reliable manufacture and fabrication of large plates with thin tantalum cladding has traditionally been challenging. Cladding technology improvements in recent years have been shown to provide reliable clad plates, formed cans, and formed heads with CRA thickness in the 1mm range and steel base metal exceeding 50mm. Production of plates up to 6 sq-m area with 100% consistent bond quality has become common. This presentation will review case studies of Ta clad supply as well as equipment design and fabrication challenges.

2:15 PM

The Value of ASTM Specifications when purchasing Tantalum material or equipment  (1)

Ta Clad options for the fabrication of process equipment - A comparison between Explosion Clad and CL Clad (2)

David Frey (Biography)
VP Technology

Abstract (1): The Importance of ASTM Specifications When Purchasing Tantalum Material and Equipment. This presentation will examine the value of ASTM specifications as a means to insure the uniformity of quality and minimum properties of Ta tubing and sheet products. The role of ASTM supplementary requirements as a means to verify product quality and uniformity will be examined.

Abstract (2): The presentation will compare explosive clad and braze cladding technologies and the advantages of each. Examples of the successful use of each technology will be discussed.

2:40 PM

Advancements in the design, fabrication and welding of Tantalum Heat Exchangers

Justin Muscarella (Biography)
Senior Project Manager Engineered Products
Titan Metal Fabricators

Abstract: Tantalum Heat Exchangers have evolved over the past recent years. Current design features and benefits along with welding and QC procedures will be discussed.

3:05 PM

Ultra 76 Plus

Paul Aimone (Biography)
Sr. R&D Staff Engineer
H.C. Starck

Abstract: Tantalum and tantalum alloys have been extensively used in electronic, chemical processing, and other industries for many years. Alloying tantalum with tungsten improves mechanical strength as well as increasing corrosion and hydrogen embrittlement resistance without degrading the other physical properties of pure tantalum. The protective tantalum pentoxide (Ta2O5) layer provides the outstanding corrosion resistance of tantalum and tantalum alloys to almost all chemicals. Industrial experience has repeatedly shown that even when chemical attack of this oxide layer occurs, hydrogen embrittlement rather than metal loss is the predominant failure mechanism for tantalum materials. H.C. Starck has developed a new tantalum alloy with improved corrosion and hydrogen embrittlement resistance. Testing has shown this derivative of the Ta-3W alloy has corrosion and hydrogen embrittlement rates that are orders of magnitude lower than the conventional Ta-3W alloy in hydrochloric and sulfuric acids with comparable mechanical properties.

3:30 PM

General Q & A / Open Discussion Session Co-ordinated by

Dr. Hira Ahluwalia
Material Selection Resources Inc.

4:00 PM

Symposium Closes