The new standards shall prevail or the technical requirements of the consultant shall prevail.
The requirements of general electromechanical consultant technical specifications are as follows:
Concrete inertia base
a. The concrete inertia base must be cast in a steel frame made of steel beams or steel grooves to strengthen the rigidity of the base so as to avoid base deformation, alignment error between the driven and driven equipment, or transfer of external stress to the equipment. The base must include height reduction bracket, concrete strengthening facilities and equipment installation and fixing bolts.
b. The thickness of concrete inertia base shall be provided according to the recommendations and requirements of the equipment supplier, but the thickness shall not be less than 150 mm or 1/12 of the longest size of the base, and the thickness shall not exceed 300 mm except in special cases.
c. The most basic strengthening requirements of concrete inertia base shall be that 13mm steel stiffeners or angle steel bars shall be laid 40mm above the base bottom and welded in two directions at a spacing of 150mm, or strengthening facilities shall be added according to the actual structure.
d. Unless otherwise specified, the weight of the entire concrete inertia base must be 2 to 3 times of the total weight of the equipment it will support.
5. Dimension definition of concrete foundation
The size of the pump concrete foundation shall be larger than the size of the pump pedestal, and the size increment on each side shall not be less than 150mm; The height of the concrete foundation above the finished surface of the building shall not be less than 100mm;
6. Selection of stopper
The installation of the limiter is mainly to limit the horizontal displacement caused by the pump vibration, but this displacement is very small. Whether the limiter is installed depends on the specific requirements of the customer.
7. Calculation of valve efficiency, vibration transmissibility and other parameters
Through the calculation of the above parameters, select the type of shock absorber and verify whether the vibration reaches resonance? Whether the valve efficiency meets the requirements.
8. Dynamic return force calculation
The calculation of this force value is mainly related to the selection of matching shock absorber. Whether the type selection of shock absorber is correct or not is directly related to whether the pump valve efficiency and other parameters meet the standard. The calculation of the dynamic return force is relatively complex, which requires the parameters such as the head, flow, outlet value of the pump.
After mastering the above key points, the problem of valve seat selection is solved.
The vibration damping pedestal on site will generally be customized by the on-site construction unit from a professional vibration damping manufacturer or made on site according to the technical requirements.