STP125 Cleaning in Place (CIP) Procedure

The Cleaning in Place (CIP) Procedure Checklist

The Gardner Denver STP125 Cleaning in Place (CIP) Procedure Checklist provides operators and sanitation/service personnel with a reference procedure for cleaning the STP125 pump without requiring complete disassembly.

The STP125 may be manually cleaned or cleaned in place. However, CIP requirements can vary depending on the product being transported and applicable sanitation requirements.

Specific procedures must therefore be established by the carrier, shipper or application owner.

Download the STP125 Cleaning in Place (CIP) Procedure Checklist

Why CIP Matters in Food-Grade Liquid Transfer

When a transport pump handles products such as syrups, dairy products, vegetable oils, juices, chocolate or starches, cleaning between loads is an important part of maintaining the transfer system.

Residue can remain in fittings, internal pump areas and other product-contact surfaces if the cleaning cycle does not provide the required combination of temperature, flow, pressure and time.

Cleaning in place allows hot water or the specified cleaning solution to circulate through the pump as part of a defined sanitation procedure while reducing the need to manually disassemble the pump for every cleaning cycle.

The actual sanitation standard remains application-specific, which is why the STP125 procedure should be incorporated into the carrier’s or shipper’s established cleaning requirements rather than treated as a universal sanitation specification.

Critical STP125 CIP Precaution: Avoid Thermal Shock

Before beginning CIP, operators need to consider more than the maximum cleaning temperature.

Do not subject the STP125 to rapid temperature changes.

A rapid change in temperature can create thermal shock, which can cause pump seizure and internal damage.

This means the temperature transition into and out of a hot-water cleaning cycle matters, not just the target cleaning-fluid temperature itself.

Preparing the STP125 for CIP

Begin by identifying the last product handled by the pump. This helps determine the appropriate sanitation requirements before the cleaning process begins.

Remove dust caps and applicable fittings, then rinse residue from the fittings using hot water.

The cleaning supply can then be connected in one of two ways:

Hot-water connection: Connect the hot-water hose directly to the pump inlet.

Tank-trailer cleaning cycle: Connect the pump inlet to the tank-trailer outlet valve during the trailer’s hot-water cleaning cycle.

If a discharge restriction valve is not already fitted, install a ball or gate valve on the pump discharge. This valve is used to restrict liquid flow and establish the required pump pressure during cleaning.

For hydraulically driven pumps, make sure the hydraulic proportional control valve is in the neutral position before beginning operation.

STP125 CIP Temperature, Pressure and Time

Three operating parameters are particularly important during the cleaning cycle:

CIP Parameter	STP125 Procedure
Hot-water temperature	176°F–194°F (80°C–90°C)
Target cleaning pressure	60–75 PSI
Time at cleaning pressure	15 minutes

These parameters work together as part of the cleaning procedure and should not be treated independently.

Running the STP125 Cleaning Cycle

Start the system and operate the pump at its normal operating speed.

Open the discharge ball or gate valve to allow the hot water or specified cleaning solution to flow through the pump.

For a hydraulically driven STP125, select forward on the proportional control valve and slowly increase to full pump speed.

For an electrically driven STP125, start the system and slowly increase speed using the belt variator handwheel.

Once cleaning fluid is circulating, use the discharge valve to restrict flow and raise pump pressure.

The target cleaning pressure is 60–75 PSI.

Verify pressure using a gauge installed at the discharge outlet.

Once the correct cleaning pressure has been established, operate the pump at that pressure for 15 minutes.

Additional Cleaning for STP125 Pumps With a Relief Valve

This part of the procedure applies only to pumps fitted with a relief valve.

Do not perform it on an STP125 that does not have a relief valve.

For equipped pumps, close the discharge valve until the relief valve activates. Open the valve, close it again and then open it once more.

This sequence is intended to help remove residue from areas that normal circulation may not reach as effectively, including:

Behind the relief-valve diaphragm
Other close-tolerance internal areas

This is an important distinction for operators because the step is configuration-dependent rather than part of every STP125 cleaning cycle.

Completing the CIP Procedure

After the cleaning cycle is complete, shut down the pump system in the reverse order of the startup procedure.

Clean all external fittings from the fittings box using hot water and return them to their proper location.

Then:

Remove hoses and fittings from the pump
Bag the hose ends
Seal the pump ports

These final steps help protect the cleaned system following the CIP process.

When Should the Cleaning Process Be Stopped?

CIP should not simply continue when operating conditions fall outside the expected procedure.

Stop the cleaning process if:

The CIP procedure cannot be completed as described
Abnormal pressure occurs
Abnormal temperature occurs
Product residue remains after cleaning

Contact Gardner Denver Technical Support or an authorized service provider for application-specific CIP guidance before returning the pump to service.

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Frequently Asked Questions

Yes. The STP125 may be manually cleaned or cleaned using a Cleaning in Place procedure. The Gardner Denver guide provides a typical CIP reference procedure, while specific sanitation requirements should be defined by the carrier, shipper or application owner based on the product handled.