Positive Material Identification

Positive Material Identification

TPS is committed to insuring our clients can provide positive material identification to their customers in the products they provide. It is well known that mill certifications and heat markings alone can become unreadable.  Since MTR’s are provided at the mill, by the time the material is handled at the service center and subsequent fabricators, the chance for errors increase. In some parts or products this may not matter but in critical applications the failure could be catastrophic, or even deadly.

TPS also analysis products already in use, such and vessels, boilers, piping, cranes, etc., to verify and identify the base material. We are then able to consult with you as to the proper material and procedures for repair to comply with the respective codes.

TPS uses one of two methods to validate your material in question. The hand held NITON® XLt 898 X-ray Fluoresce  Machine (XRF). NITON’s  XRF alloy analyzers are portable hand held devices that can perform a non-destructive test on the material at any time. XRF works by exposing the material to a flux of X-rays. The atoms then absorb the energy and become temporarily excited and they fluoresce, or emit X-rays. T X-rays emitted by the sample’s atoms possess clearly defined energies that are unique to the elements present in the sample. By measuring the intensity and energy, the XRF instrument can provide qualitative and quantitative analysis. In other words it can identify the elements, measure the concentration of each and display them on the unit. The data can be downloaded and saved for reference or creating reports.

TPS also uses Optical Emission Spectrometry (OES), with a WAS PMI-Master machine.  Optical Emission Spectrometry uses argon gas passed through a micro wave RF coil and excitation is initiated with a high voltage the argon ionizes a produces a plasma state which is at a temperature of 6000°C to 10,000°C. On addition of aqueous or organic solutions or suspensions of metals or non metals to the argon plasma, excitation of the elements will occur resulting in the emission of specific wavelengths of electromagnetic radiation. The intensity of the radiation is proportional to the concentration of the element in the solution. Each element emits at multiple wavelengths. These wavelengths are separated by a diffraction grating and sent to photo multiplier tubes. With appropriate amplifiers, A to D converters, computers and software a powerful analytical instrument is at the disposal of TPS. The main advantage of Optical Emission Spectrometry is the linear dynamic concentration of the analysis from ppb levels to ppm levels and the ability to analyze multiple elements simultaneously.