how to assemble the chemical cartridge seal

Chemical cartridge seal assembly is safe, precise, and standardized—follow this concise step-by-step guide for leak-free results, with emphasis on cleanliness, alignment, and no impact force.

Pre‑Assembly Prep

- Safety First: Wear chemical‑resistant PPE (gloves, goggles, apron); work in a ventilated area with spill kits.
- Inspect: Check cartridge for damage; verify all components (gland, O‑rings, set screws, springs) match the model; discard if seal faces are chipped/scratched.
- Shaft/Chamber Prep: Clean shaft/sleeve (Ra 0.2–0.4 μm) and seal chamber; confirm shaft runout ≤0.1 mm; remove burrs/scale.
- Lubricant: Use medium‑compatible lubricant (e.g., fluorine‑based for corrosives) to avoid contamination.

Step‑by‑Step Assembly

1. Lubricate: Apply a thin, even film to seal faces, elastomer contacts, and shaft/sleeve installation area—no excess.
2. Gasket Prep: Fit gland/drive collar gaskets (use silicone grease to hold in place); avoid sharp tools .
3. Install Cartridge: Align with shaft; push evenly axially (no hammers); rotate shaft by hand while pushing to ensure smooth seating.
4. Gland Fastening: Mount gland to seal chamber; tighten bolts diagonally/alternately (finger‑tight first, then incrementally) to avoid warping .
5. Set Collar/Set Screws: Adjust drive collar gap per spec (e.g., 3/32” for 33–65 mm shafts); tighten set screws evenly (align with drilled holes if applicable) .
6. Release Locking Devices: Remove/rotate spacers/locking washers to clear the sleeve; do not skip this step .
7. Final Checks: Rotate shaft manually to confirm no binding; verify all fasteners are tight and seal faces are clean/free of debris .

Post‑Assembly & Startup

- Reassemble pump, align coupling, and check for pipe strain .
- Perform a leak test (air/water) before introducing process media.
- Start the pump slowly; monitor for leaks, unusual noise, or excessive temperature rise.

Key Do’s & Don’ts

- ✅ Do use only manufacturer‑approved lubricants and tools.
- ✅ Do maintain axial alignment throughout installation.
- ❌ Don’t strike the cartridge or seal faces with hard tools.
- ❌ Don’t over‑tighten bolts/screws (risk of deformation/leakage).
- ❌ Don’t mix incompatible lubricants with the process medium.

Critical Notes

- Follow the seal manufacturer’s manual for model‑specific settings (gap dimensions, torque values, and locking features).
- For dual‑cartridge seals, ensure proper flush/barrier fluid connections before startup.