How to choose a pump seal
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There is a sewage feed pump with the model number EHG100--65--200A. Due to seal leakage, the seal needs to be replaced. What model should be used? Are there any standards? How do I know what size to replace it with? I know absolutely nothing about this area; please, experts, give me some advice. Thank you, points will be given
Find a machine seal manufacturer you are familiar with; have them visit your factory to understand in detail the operating conditions there, and they will provide recommendations
Find information on this pump; there should be instructions regarding sealing. Depending on the medium being transported and the sealing requirements, mechanical seals can come in various forms – they can be single-sided or double-sided, and the materials used for the friction pairs, shaft sleeves, and O-rings all differ. You should look for the manual or consult the manufacturer of the mechanical seals. Once you have identified the model, obtain a set of spare parts!
Is mechanical seal leakage part of the normal service life? Provide a detailed description of the operating environment. Whether the mechanical seal design is suitable for the operating conditions is the most critical factor for its service life
The mechanical seal can be removed, photographed, and uploaded. Generally, the inner diameter is measured. Or directly provided to the mechanical seal manufacturer.
It is estimated that the inner diameter of your seal is around 50 mm. First, purchase a set from the original pump manufacturer, replace the old seal, and then buy a new one based on that old seal
Remove the old one, and find a mechanical seal manufacturer. If it is a standard part, the manufacturer can determine that right away; if it is a custom part, it’s best to purchase it from the pump manufacturer
The information can be found by directly checking the drawings, or one can consult the pump manufacturer to place an order; after disassembly, it is also possible to seek a sealing manufacturer to carry out measurements and drawings
Wastewater may contain solid particulate impurities. Generally, a double-end mechanical seal should be used, or two single-end mechanical seals.