As an independent specialist, Siempelkamp Prüf- und Gutachter-Gesellschaft (SPG) is the company to go to for the testing, design and inspection of assemblies subject to high loadings and their associated components made of creep-resistant materials and non-ferrous alloys. SPG possesses expertise in materials and component testing, strength calculation, condition analysis and service life assessment and provides support to its customers in product development and during approval procedures and routine quality control.
SPG is accredited by DAkks as a testing laboratory according to EN ISO/IEC 17025:2018-03 and an inspection body according to EN ISO/IEC 17020:2012-07. The testing laboratory accreditation naturally includes standards relating to creep and creep relaxation tests such as EN ISO 204:2009, EN 10319-2:2003 and ASTM E139-11.
145 creep testing machines are in use for test temperatures up to 950°C and static loads up to 20 kN. In order to achieve even higher test temperatures and more flexible load and temperature cycles, the existing testing machines were supplemented by four Kappa 50 LA-Spring creep testing machines by ZwickRoell. This enabled both creep and creep relaxation tests, including load and temperature blocks, to be performed. The testing machines are equipped with high-temperature furnaces (up to 1,200°C) and feature a nominal force of 50 kN. High-temperature extensometers are used for direct strain measurement on the specimen up to break, allowing determination of creep equations, for example. Control of the four testing machines is handled by a measuring computer; data is processed and stored on a central measured-value acquisition system.
Together with partners from industry, testing institutes and higher education, SPG has made a significant contribution in numerous research projects to the creation of a substantial database of long-term characteristic values for modern high-temperature materials and associated welded joints. The actual test data ultimately found their way into various rules and standards and today represent an important basis for the safe design of high-temperature components.
"The ZwickRoell testing machines fit in perfectly with our numerous existing machines, while considerably expanding our testing capabilities in the high-temperature range with higher test temperatures and loads plus flexible test cycles. This allows us as testing service providers to offer even better service to our customers in the energy sector and in refineries and chemical plants," stated Dr Seliger in connection with the decision to invest in ZwickRoell products.