S-CLP Lift Action Chemical Pump

Frequently Asked Questions: S-CLP Lift Action Chemical Pump

What is a lift action drum pump?

A lift action drum pump is a manual vertical-action piston pump that transfers liquid from drums and containers using a simple push-pull handle motion. The S-CLP uses this mechanism with a nylon body, stainless steel plunger rod and PTFE seal to safely transfer chemicals from 25 litre drums. Unlike rotary or lever barrel pumps that use metal components, the lift action design keeps all wetted parts in chemical-resistant materials. The vertical piston creates suction on the downstroke and discharges fluid on the upstroke, delivering 190 ml per cycle.

How much liquid does the S-CLP dispense per stroke?

The S-CLP delivers 190 ml (6.3 oz.) of liquid per stroke. This means a full 25 litre drum empties in approximately 132 strokes. The output rate is consistent regardless of fluid viscosity (within the recommended range) because the PTFE-sealed piston maintains a tight seal throughout its travel. For comparison, some competing 25 litre drum pumps deliver only 100-150 ml per stroke, requiring significantly more effort to transfer the same volume.

How does the S-CLP lift action pump work?

The S-CLP works by creating alternating vacuum and pressure inside a sealed cylinder using a PTFE-sealed piston on a stainless steel rod. Pushing the handle down draws liquid up through the nylon suction tube into the pump chamber. Pulling the handle up forces that liquid out through the discharge spout. The pump is self-priming, meaning it begins transferring fluid from the first stroke without any manual filling of the suction tube. No electricity, compressed air or batteries are needed.

What chemicals can I transfer with the S-CLP?

The S-CLP handles a wide range of chemicals including lacquer, thinners, acetone, antifreeze, brake cleaner, detergents, glycerine, water, weed killer, mild acids, urea, DEF and petroleum-based media. The nylon body, stainless steel plunger and PTFE seal provide resistance to most solvents, mild acids (below pH 2) and water-based solutions. Fluids NOT recommended include strong mineral acids (concentrated sulphuric, nitric), bleach (sodium hypochlorite), gasoline and concentrated caustic solutions, which can degrade nylon over time.

Is the S-CLP self-priming?

Yes, the S-CLP is fully self-priming. The PTFE-sealed piston creates sufficient vacuum on the first downstroke to draw liquid up through the suction tube without any manual priming. This is a critical safety feature for chemical handling: operators never need to mouth-siphon or hand-fill the tube with hazardous fluids. Simply install the pump on the drum and begin pumping immediately.

Can I use the S-CLP for DEF and urea from a 25 litre container?

The S-CLP is well-suited for dispensing DEF (diesel exhaust fluid) and urea solutions from 25 litre containers. DEF is a water-based urea solution that corrodes metal pump components over time through crystallisation. The S-CLP's nylon body and PTFE seal are immune to urea crystallisation and water-based corrosion. Many automotive workshops and fleet depots use 25 litre DEF containers as their standard supply format, making the S-CLP the correct pump for this application.

Can I use the S-CLP for petroleum-based fluids?

Yes, the S-CLP handles petroleum-based media including light oils, hydraulic fluid and petroleum solvents. The PTFE seal and nylon body resist petroleum derivatives without swelling or degradation. However, for transferring gasoline or highly volatile petroleum spirits, a pump with a flame arrestor is recommended for safety compliance. The S-CLP does not include a flame arrestor, so it suits petroleum-based solvents and oils but not raw fuel transfer in environments requiring explosion-proof equipment.

What size drums does the S-CLP fit?

The S-CLP is designed specifically for 25 litre drums and 5 gallon pails with a standard 2" (51 mm) bung opening. The nylon suction tube length is matched to reach the bottom of a 25 litre container. For larger 205 litre (55 gallon) drums, use the S-CLP/XL, which has a longer suction tube and higher 400 ml per stroke output suited to the larger volume.

How do I fix air lock in the S-CLP?

Air lock occurs when air enters the pump chamber and prevents the piston from creating suction. To fix: ensure the suction tube is fully submerged in liquid (not drawing air from above the fluid level). Check that the bung adaptor is threaded tightly with no air gaps. Pump the handle rapidly 5-10 times to purge trapped air through the discharge spout. If air lock persists, remove the pump, inspect the PTFE seal for wear or damage, and confirm the suction tube has no cracks that allow air ingress.

Why is my drum pump leaking from the seal?

Seal leakage typically indicates a worn PTFE piston seal or chemical damage to the seal surface. Over thousands of cycles, the PTFE seal wears against the cylinder wall and loses its tight fit. Aggressive chemicals outside the recommended range (strong acids, bleach) can also degrade the seal prematurely. Replace the PTFE seal kit when leakage begins. Spare seal kits are available from STAR. Also check that the plunger rod is straight and undamaged, as a bent rod causes uneven seal wear.

Can I use the same pump for different chemicals?

You can use one S-CLP for multiple compatible chemicals, but thorough cleaning between different fluid types is essential. Residual chemical A mixing with chemical B can cause reactions, contamination or hazardous fumes. For incompatible chemicals (acids after solvents, petroleum after water-based), flush the pump with clean water or appropriate solvent, then dry before switching. Many workshops colour-code their pumps (one per chemical type) to prevent cross-contamination entirely.

How do I clean the S-CLP between chemicals?

Flush the pump by placing the suction tube in a container of clean water or appropriate cleaning solvent, then pump 10-15 strokes to purge residual chemical from the chamber and tube. For sticky residues (lacquer, glycerine), use warm water or the appropriate solvent for that chemical. Disassemble the pump periodically to inspect and wipe the piston seal, plunger rod and suction tube interior. Allow all components to dry before reassembly if switching to a water-sensitive chemical.

How do I store a lift action pump when not in use?

Remove the pump from the drum, flush with clean water, dry all components and store in a clean, dry location away from direct sunlight. UV exposure can degrade nylon over extended periods. If storing with residual chemical inside (for pumps dedicated to one fluid), ensure the bung adaptor is capped to prevent evaporation and vapour release. Store vertically with the discharge spout pointing up to prevent residual dripping. Replace the PTFE seal if the pump has been idle for more than 12 months before returning to service.

Is a lift action pump safer than pouring from a drum?

Significantly safer. Tipping a 25 litre drum (which weighs 20-30 kg when full) risks splashing, spilling, back strain and uncontrolled flow. A lift action pump keeps the drum upright and stable, delivers measured volumes per stroke, keeps the operator's hands away from the chemical, and eliminates splash-back. For hazardous chemicals (solvents, acids, pesticides), pump transfer is a workplace safety requirement in most jurisdictions. The S-CLP's self-priming design adds another safety layer by eliminating manual priming contact with the fluid.