Germany - The Institute for Plastics Processing (IKV) requires a test chamber for a

Description

The Institute of Plastics Processing (IKV) requires a test chamber for a planned test stand for determining the H2 and O2 permeability of tubular test specimens with a length of up to approx. 400 mm and a diameter of up to approx. 160 mm, but never exceeding the total volume of 1 L in order to be classified within the scope of Article 4 (3) of the Pressure Equipment Directive PED. IKV supervises and is responsible for the selection and use of these pipe test specimens, which are to be tested with test gas (H2 or O2) and water partially charged with test gas at internal pressures of up to 50 bar and temperatures of up to 100 °C. Outside the pipe test specimens, a purge gas (N2 or He) is to flow continuously through the test chamber at ambient pressure.In the opinion of the RWTH Aachen University's Occupational Health and Safety and Radiation Protection Department, the planned system is therefore not to be classified as requiring monitoring. Nevertheless, a sudden increase in pressure from ambient pressure to 50 bar is possible, so the test chamber must be able to withstand this increase in pressure and the load from any shrapnel that may form on the tube test specimen without damage. This serves as a guide and is not to be understood as a fully designed test chamber. Among other things, the test chamber must provide a means of fixing a prepared specimen with as few hand movements as possible. In the attached example, this is provided by an M60 threaded hole, which allows different specimens to be inserted flexibly. The components for preparing the specimen are not a fixed part of the tender, but can be offered as an option, and the test chamber must be easy and reliable to open and close. In the case of a box-like construction as shown in the CAD sketch, components such as shock absorbers to prevent the lid from falling down and an electronic locking device for reliable protection must be used here.the test chamber must provide holes for the supply and removal of the purge gas and for the attachment of a pressure sensor. The inner surface of the test chamber should have the lowest possible surface roughness in order to keep the adsorption of gases to a minimum.the test chamber must be rustproof.the associated valves and pressure reducers are also part of the tender. These are shown schematically in the attached flow diagram.valve V1 should enable the purging of the sample with nitrogen (between 0-0.5 bar relative pressure), as well as the possible filling of the sample with water, and finally the introduction of H2 or O2 into the sample at up to 50 bar. Valve V2 should allow the test chamber to be purged with nitrogen (between 0-0.5 bar relative pressure), but must be able to withstand the sudden pressure increase to up to 50 bar in the event of a sample failure, if necessary by means of a non-return valve or similar.Valve V3 is intended for draining the media from the sample at the end of the measurement and must be designed for 50 bar.The pressure reducer D1 must depressurize the water-gas mixture or a pure gas (H2 or O2) to ambient pressure.The pressure reducer D2 must protect the downstream sensor system from sudden pressure increases, i.e. in particular in the event of failure of the sample, the pressure downstream must always be limited to a maximum of 0.5 bar relative pressure.

Opportunity closing date

12 November 2024

Value of contract

to be confirmed