Recommended Procedures: Soluble Oil Systems

Tips for managing soluble metal working fluid after shutdown

What are the recommended procedures for
soluble oil systems after shut down?

If you have a period of shutdown, we recommend metalworking fluid users follow the below procedure before production gets underway again.

Our Top Tips for Managing Metalworking Fluid after Shutdown:

  • Skim off any tramp oil – this will allow your coolant to breathe
  • Circulate the fluid for at least an hour
  • Check dilution using a hand refractometer
    – Aim for the upper of the recommended range
    – If you’re unsure of the recommended dilution, contact our technical team who can advise
  • Top up fluid accordingly
  • Check pH level
    – If you get a low pH reading between 8.2 – 8.5 add Biotect @ 0.20% of sump capacity
    – pH readings below 8.2, a full system sterilization and fluid change is advised
  • Carry out dipslide testing
    – Refer to HSE MW05 for acceptable levels
    – Carry out full system sterilization

    Our technical team are on hand if you have any questions, or would like some assistance with your metalworking fluid management. Our PROCARE Fluid Management service can include all of the above routine checks, and ensure you are HSE MW05 compliant. Call us on 0114 285 2987 or email us: [email protected]


Pennine are more than just a supplier, they offer technical support and expertise. They provide full regular monitoring of metal working fluids and any aspects that support the safe use and operation of the oils and coolants we use on our site. Kevin Martin, Health & Safety Manager, Abbey Forged Products

They offer an excellent service, are polite and offer helpful advice. Mathew Kelly, Operations Manager, Barrett Steel

The communication from Pennine is great, we are always fully informed of our order status and they always deliver on time. I have been really impressed with the quality of their oil. Mark Wood, Fitter, Betney Cop Restoration Co.

We've recently changed to Pennine Lubricants, I can't thank Bob enough for the effort and service that's provided every time we order. Always happy to do business. Mylo Charlesworth, Purchasing and Warehouse Operative, CNC

In fifteen years of dealing with Pennine Lubricants, I have found the service to be impeccable. Jeremy Gosling, Director, Fine Grinding LTD

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