Pump selection for pharmaceutical and biotech facilities: what material certifications and listings mean and what to confirm before the specification is written.

Engineers specifying pumps for pharmaceutical and biotech utility systems work within material and documentation requirements that do not apply to standard commercial HVAC pump specifications. The pump that is appropriate for a commercial chilled water system may not be appropriate for a pharmaceutical utility system serving the same building, not because the hydraulic requirements are different but because the material requirements, the certification requirements, and the documentation requirements are different.

Understanding what those requirements mean before the specification is written is how engineers avoid discovering them after the pump is ordered, when lead times and project schedules do not allow for a respecification.

Why pharmaceutical utility pump specifications are different

Pharmaceutical manufacturing facilities operate under FDA current Good Manufacturing Practice regulations that extend to the utility systems supporting the manufacturing process. Steam, purified water, water for injection, and process cooling systems that contact or directly support the manufacturing process are subject to the same material and documentation discipline as the manufacturing equipment itself.

Pumps in these utility systems need to be specified with the regulatory environment in mind. A pump that circulates purified water in a pharmaceutical facility needs materials that are compatible with the water purity requirements and with the cleaning and sanitization agents used in the system. A pump serving a clean steam system needs materials that will not contaminate the steam or degrade under the operating conditions of the system. The pump specification starts with the fluid and the system requirements, not with the hydraulic performance alone.

NSF 61 and NSF 372

NSF International Standard 61 covers the health effects of materials in contact with drinking water. A pump with NSF 61 certification has been tested and certified to confirm that the materials in contact with the fluid do not leach contaminants into the water at levels that exceed the health-based limits in the standard. NSF 372 certifies that the wetted components of the pump are lead-free as defined by the standard.

For pharmaceutical utility systems involving purified water or water for injection, NSF 61 and NSF 372 are frequently specified because they provide a documented baseline for material safety in water contact applications. The certifications are granted to specific pump models and configurations by NSF International, and the certification is specific to the materials and construction of the certified product. A pump that is certified does not automatically mean that every configuration of that pump model is certified. Confirm that the specific configuration being specified, including the seal material, the impeller material, and any optional components, is covered by the certification.

Material compatibility in pharmaceutical utility applications

Beyond NSF certification, pharmaceutical utility pump specifications often include explicit material requirements driven by the specific fluid, the operating conditions, and the cleaning and sanitization requirements of the system.

Stainless steel construction is common in pharmaceutical utility pump applications. The distinction between 304 and 316L stainless steel matters in pharmaceutical specifications because 316L has better corrosion resistance in the presence of chlorides and cleaning agents commonly used in pharmaceutical facilities. A specification that calls for stainless steel construction without specifying the alloy leaves the material selection to the pump manufacturer, which may not result in the alloy the facility’s quality system requires.

Elastomer selection for seals, o-rings, and gaskets needs to be confirmed against the fluids and cleaning agents the pump will contact. EPDM is commonly used in hot water and steam applications. Viton provides better resistance to many chemical cleaning agents. For pharmaceutical applications where the pump contacts purified water or process fluid, the elastomer specification needs to be confirmed against the facility’s approved materials list before the pump is ordered.

For pumps in clean steam or water for injection applications, the surface finish of wetted components may be specified to a maximum roughness average. Rough internal surfaces in pharmaceutical fluid contact applications provide sites for biological growth and particle accumulation that smooth surfaces do not. Where surface finish is specified, confirmation that the pump manufacturer can meet and document the specified finish needs to happen before the order is placed.

What to ask pump manufacturers and suppliers

The specification questions that matter in a pharmaceutical utility pump application go beyond the standard hydraulic performance questions. What materials are used in the wetted components and can the manufacturer provide documentation of those materials? What NSF certifications apply to the specific configuration being specified and does the certification cover the seal and elastomer materials in the configuration? What surface finish is achieved on the wetted components and how is it measured and documented?

These questions need answers before the purchase order is written. A pump manufacturer that cannot answer them clearly or cannot provide the requested documentation is telling you something important about whether their product is appropriate for the application.

For engineers specifying pumps for pharmaceutical utility systems, the conversation with the pump supplier needs to include the regulatory context of the application, the material requirements of the system, and the documentation the facility will need to support its qualification process. A supplier who understands that context is a more useful resource than one who leads with hydraulic performance and price.

Clean steam and high-purity water applications

Clean steam systems and high-purity water systems have pump requirements that are distinct from standard HVAC and process pump applications. The condensate from a clean steam system needs to be returned through a condensate pump that does not introduce contamination into the condensate that would compromise the steam quality when the condensate is returned to the clean steam generator.

For water for injection circulation systems, the pump needs to maintain the continuous circulation velocity required to prevent bacterial growth in the distribution loop, without introducing materials into the water that would compromise the water for injection quality specification. The pump selection for a water for injection loop is driven by the loop flow rate and pressure requirements, the material requirements of the system, and the need to maintain continuous circulation without dead legs or low-velocity zones where biological growth can establish itself.

For pharmaceutical and biotech facilities across Pennsylvania, New Jersey, Delaware, and Maryland, the Merion Pump Company team can support pump specification conversations for utility system applications. For the steam systems that pharmaceutical utility pumps serve, the GP Energy Products team handles commercial and industrial steam system specification. Visit gpenergyproducts.com for more on GP Energy’s industrial steam capabilities including Sellers Manufacturing deaerators and boiler feed systems. For pharmaceutical utility systems where the pump is part of a larger packaged system, the FabPro Systems team handles packaged utility system design. Visit fabprosystems.com for more. For coil and heat exchanger applications in pharmaceutical utility systems, the HX Coils team handles coil specification for regulated environments. Visit hxcoils.com for more.

References
1. NSF International. NSF/ANSI Standard 61. Drinking Water System Components and Health Effects. Covers certification requirements for pump materials in drinking water and high-purity water applications. nsf.org
2. NSF International. NSF/ANSI Standard 372. Drinking Water System Components and Lead Content. Covers lead-free certification requirements for wetted components in water contact applications. nsf.org
3. ISPE. Good Practice Guide: Heating, Ventilation, and Air Conditioning. Covers utility system requirements for pharmaceutical manufacturing facilities including pump material and documentation requirements. ispe.org
4. FDA. 21 CFR Part 211. Current Good Manufacturing Practice for Finished Pharmaceuticals. Governs equipment and material requirements in FDA-regulated pharmaceutical manufacturing utilities. fda.gov