The most important step before purchasing a new machine is to establish acceptance testing. Acceptance testing can be used to ensure the new machine is free from faults and runs smoothly before placing it in service. The purchase order can specify where and how vibration measurements are taken on the machine and type of vibration data (displacement, velocity, or acceleration) are to be collected. It can also specify the procedures for measuring vibrations after startup at the plant. The sign-off does not have to be made immediately after receiving the machine. The machine has to be checked and ensured it is working properly under normal loads and within vibration limits.
A purchaser can establish standards for new machine that supplier must meet. The supplier must take the measurements according to purchase order. It is suggested that the purchase order should include the following specifications:
1. The measurement locations where vibration data need to be collected.
2. Vibration amplitudes that are acceptable within vibration limits at measurement locations.
3. The type of probe (accelerometer, eddy-current, etc) and attachment (magnetic, stud, etc) the purchaser plans to use.
4. The type of instrumentation (vibration analysis software, data acquisition system, etc) purchase plans to implement.
The vibration tests may be performed at manufacturer’s facility to verify the vibration levels specified in purchase order. However, if this is not feasible, the tests or measurements may be performed once the equipment is installed. If the tests do not meet the criteria, it may still be rejected.