Tag: Mechanical Seal Design: Application Review Checklist
Mechanical seal design starts with the conditions at the seal chamber, not just a shaft diameter or a replacement part number. Use this application-review checklist to organize the information needed before choosing a seal arrangement, face materials and a piping plan.
1. Build a duty profile before selecting a seal
Liquid: record the product name, concentration, solids or fibres, and any tendency to crystallize or leave deposits. Include cleaning liquids if the pump is cleaned in place.
Operating range: provide normal and maximum temperature, seal-chamber pressure and shaft speed. Identify startup, standby and shutdown conditions separately.
Installation: check shaft or sleeve diameter, chamber bore and depth, gland fixing dimensions, available axial space and flush-port positions against a drawing.
Service expectations: explain leakage restrictions, available utilities, maintenance access and the previous failure pattern.
2. Turn operating observations into design questions
Leakage mainly during startup? Record whether the chamber was filled and vented, when the flush became available and how the pump was started. A replacement seal alone does not resolve an unidentified startup problem.
Deposits around the faces or in the flush line? Review fluid behaviour during cooling and standby as well as during normal production. Ask whether the proposed arrangement can keep the seal environment suitable throughout that cycle.
A replacement fits but fails repeatedly? Compare the complete installed arrangement, material specification and support system. Matching the envelope dimensions is only one part of confirming suitability.
3. Review the piping plan with the seal
Plan 11 routes liquid from the pump discharge through a restriction orifice to the seal chamber. Before proposing it, review the available pressure difference, required flush flow and the risk of solids or deposits obstructing the line. Do not choose an orifice solely from the shaft diameter or copy a setting from a different pump.
Read our Plan 11 function, orifice and maintenance guide for the arrangement discussed in this collection. For the wider subject, start with mechanical seal piping plans or browse the mechanical seal design article library.
4. Prepare a useful design-review enquiry
Send a pump model and duty summary, a dimensioned seal drawing or clear measurements, the current seal and material details if known, and photographs showing the assembly and damage. Label unknown values as unknown rather than estimating them. Keep normal operating values separate from equipment limits.
Contact Fluid Tech Service with these details to discuss the application. Final selection requires confirmation against the actual pump, process conditions and supplier drawings; this checklist is a preparation aid, not an approval for a particular installation.
