Winter is an ideal time to carry out plant maintenance, but without proper preparation, your membranes could be at risk. Use this downtime strategically to protect your system, extend membrane life, and avoid costly issues during peak production.
Start by engaging early with your chemical supplier and service teams to plan your shutdown work effectively and reduce the risk of damage during maintenance and restart.
Membrane preservation remains critical during any shutdown period. Preservative plays two essential roles:
Top up preservative:
Ensure levels are at the higher end of the recommended concentration before shutdown or service work. For specific chemical requirements, consult your chemical supplier.
Circulate thoroughly:
Run all pumps to fully wet the membranes and distribute preservative evenly across the system.
Blank off smartly:
Work with your services team to remove and blank pipework in a way that minimises fluid loss, such as isolating at RJT or Tri-Clover unions.
Plan ahead:
Schedule maintenance early and execute efficiently to minimise downtime and exposure.
Reinstate with care:
Before bringing the plant back online, ensure preservative levels and soft water are correctly reinstated.
Plan well in advance for membrane installation and ensure all consumables are available on-site before shutdown begins.
These typically include:
Lip Seals:
Replace with Viton (UF) or EPDM (RO/NF) when membranes are changed out.
ATDs (Stainless Steel and Polysulfone):
Replace if any damage occurs during changeout. It’s good practice to hold spare Polysulfone ATDs (typically 1–2% of installed quantity), as damage can occur from incorrect tooling, handling, or uneven force. Stainless Steel ATDs should be planned early due to longer lead times.
Permeate Hoses:
Replace any showing wear, deformation, or signs of pressure damage.
Also check and replace hygienic sample point EPDM grommets where used.
Below is a general guide for seals used by plant/process:
| Plant / Process | Vessel Size | SMS P/No. | Material | Permeate Tube ID Size |
|---|---|---|---|---|
| RO | 8" | L-L-EPDM | EPDM (Black) | 1.125" |
| NF | 8" | L-L-EPDM | EPDM (Black) | 1.125" |
| UF | 6.3" | L-L-Viton | Viton (Orange) | 1.138" |
| MF | 6.3" | L-L-Viton | Viton (Orange) | 1.138" |
| RO | 3.8" | S-L-EPDM | EPDM (Black) | 0.830" |
| UF | 3.8" | S-L-Viton | Viton (Orange) | 0.830" |
Lips Seals or O Rings Normally Required per Vessel for ATDs and End Plugs
| No. of Vessels | Membranes per Vessel | Seal Qty Required |
|---|---|---|
| 1 | 1 | 3 |
| 1 | 2 | 5 |
| 1 | 3 | 7 |
| 1 | 4 | 9 |
| 1 | 5 | 11 |
| 1 | 6 | 13 |
Body Seals for Membrane Vessels
| SMS P/No. | Description of Housing | Qty per Vessel |
|---|---|---|
| 80-OR-EPDM-SS | Bolted retainer shim plates | 2 |
| 80-OR-EPDM-H | Bolted retainer shim plates | 2 |
| 80-OR-VITON | Special shim retainer springs | 2 |
| 63-TRI-NBR | White Tri-Clover | 2 |
| 63-S5-EPDM | White Tri-Clover | 2 |
| 63-TRI-EPDM-B | Black Tri-Clover | 2 |
Having the right tools ready before shutdown starts saves time and reduces risk.
The SMS toolkit is designed to simplify and standardise membrane changeouts, improving both safety and consistency.
Mapping the exact location and details of each membrane creates a valuable long-term asset for your plant.
A structured mapping system provides:
SMS offers a fast, user-friendly membrane mapping system to support this process.
A controlled restart is just as important as a well-managed shutdown.
Planning this in advance helps ensure a smooth transition back into production and reduces the risk of early-stage issues.
A structured restart process should include:
Contact us for our Membrane Installation Checklist to support a safe and consistent restart.
With production offline, it creates the space to build capability without operational pressure, helping operators and technical staff better understand how the system works and how to get the most out of it.
Smart Membrane Solutions offers practical, industry-led training designed for membrane plant operators, technologists, QA staff, and support personnel across dairy and liquid processing.
Our Membrane Fundamentals Training Course combines classroom learning with hands-on sessions to improve understanding, optimise performance, and lift overall plant efficiency.
1-Day Fundamentals Course
Ideal for operators or technical staff new to membrane systems or needing a refresher. Covers core principles including membrane types (MF, UF, NF, RO), system operation, cleaning basics, and key components.
2-Day Advanced Fundamentals Course
Designed for those with existing experience, this course goes deeper into membrane design, system performance, CIP optimisation, troubleshooting, and plant-specific challenges.
Get in touch if you have a specific training need, we’re happy to talk through what would work best for your team.
Winter shutdown is more than a maintenance window, it’s an opportunity to reset your system and your team for the season ahead.
A well-planned approach across preservation, components, tooling, training, and restart will reduce risk, improve reliability, and set your plant up for consistent performance.
