How to Choose the Right GemmeCotti Pump for Acids and Corrosive Liquids

Start by defining four operating parameters — liquid type and aggressiveness, required flow rate (Q), required head (H), and whether the area is ATEX-classified — then match them against GemmeCotti's published pump ranges. The site lists maximum performance for each family (for example, mag drive centrifugal pumps up to Q max = 130 m³/h and H max = 48 mlc), so the practical method is to shortlist families whose maximums comfortably exceed your duty point, then decide between magnetic drive and mechanical seal designs based on how strict your leak-containment requirement is. GemmeCotti has designed and manufactured chemical pumps for acids, aggressive and corrosive liquids for over 30 years, and states that pumps are assembled following strict procedures using components from Italian suppliers.

Step 1: Characterize the liquid before looking at pump types

The pump family choice follows from the fluid, not the other way around. Note:

• Chemical identity and concentration of the acid or corrosive liquid — this drives wetted-material selection.
• Temperature and viscosity at the pump, since both affect achievable flow and head.
• Whether the liquid is dangerous (fumes, toxicity, environmental hazard) — this is the main argument for sealless designs.
• Solids or crystallization risk, which matters for narrow-passage designs such as vane pumps.

GemmeCotti positions its range specifically for acids, dangerous liquids, and solutions in industrial and OEM processes, and states that it analyzes each customer's needs to find the right industrial pump. Use that customization channel for anything outside standard duty points.

Step 2: Decide between magnetic drive and mechanical seal

This is the central trade-off on the site, because GemmeCotti offers both architectures across overlapping performance.

Because the headline maximums for mag drive centrifugal and mechanical seal pumps are identical (130 m³/h, 48 mlc), performance ceiling alone will not decide it — the leakage requirement and seal preference should. If the fluid is a dangerous or aggressive liquid and any seal weep is a problem, start with the magnetic drive families.

Matching the mag drive sub-type to the duty

• Mag drive centrifugal pumps — the general-purpose choice for higher flows; Q max = 130 m³/h, H max = 48 mlc.
• Mag drive turbine pumps — lower flow, moderate head; Q max = 9 m³/h, H max = 50 mlc. Suited to small flows against resistance.
• Mag drive rotary vane pumps — pressure-oriented rather than flow-oriented; Q max = 2100 l/h, H max = 13 bar. Note the head is expressed in bar here, not mlc.
• Self-priming mag drive pumps — Q max = 25 m³/h, H max = 22 mlc; relevant when the pump must lift liquid without a flooded suction.
• Vertical pumps — Q max = 130 m³/h, H max = 48 mlc; consider when installation geometry favors a vertical configuration, e.g., tank or sump service.

Step 3: Check the duty point against published maximums

Treat the published Q max and H max as ceilings, not as a simultaneous operating point — a pump cannot deliver maximum flow and maximum head at once. Practical sequence:

1. Write down your required flow (m³/h or l/h) and head (mlc or bar).
2. Eliminate any family whose maximum is below either value.
3. Among survivors, prefer the family whose maximums sit above your duty with margin, so the pump runs inside its curve rather than at the edge.
4. Confirm the unit: centrifugal, turbine, self-priming, vertical, and diaphragm figures are in mlc; rotary vane and some others are in bar. Do not compare them directly without converting.

Expected result: a shortlist of one or two families plus a specific model request to GemmeCotti, whose site provides a quote request route.

Step 4: Confirm application and certification fit

GemmeCotti lists acid and corrosive-liquid pump applications across the chemical industry, galvanic industry, PCB industries, water treatment, air treatments, detergents, biofuel, loading/unloading tanks, oil & gas, food industry, bottling companies, pharmaceutical industry, aquariums, fertilizer production, textile industry, and refrigeration systems for data centers. Use this list as a sanity check that your sector is served, not as a selection criterion by itself.

ATEX: if your installation is in a classified hazardous area, filter to the ATEX pump line (Q max = 130 m³/h, H max = 48 mlc) rather than adding certification later. The site presents ATEX pumps as a distinct family alongside the standard ranges.

Other families worth checking if your duty is unusual:

• Air-operated double diaphragm pumps — Q max = 310 l/h, H max = 80 mlc.
• Portable pumps — Q max = 13 m³/h, H max = 14 mlc.
• Drum pumps, electric and pneumatic mixers, self-priming dosing pumps, and accessories.

Common sticking points

• Comparing mlc with bar. The rotary vane range is rated to H max = 13 bar while most other families are in mlc; convert before shortlisting.
• Assuming the biggest number wins. A 130 m³/h centrifugal pump is the wrong answer for a 2 m³/h transfer duty; the turbine or vane families exist for that.
• Leaving ATEX to the end. It changes the family, not just the paperwork.
• Skipping fluid data. Material compatibility for a specific acid concentration is not something the performance table answers — raise it in the quote request, since GemmeCotti states it customizes products for industrial applications.

The site's pricing is not published; the presence of a "request a quote" route and a subscribe option means commercial terms come through direct contact rather than an online price list.