Peristaltic pumps in a power plant are deployed as chemical-metering and slurry-handling machines, not as boiler-feed or condensate pumps, with primary specs driven by flowrate, discharge pressure, horsepower, and outlet diameter [S1].
The selection logic is narrow and well-defined: abrasive slurries, shear-sensitive polymers, aggressive chemistry, and accurate low-pressure metering are the four duty classes where a peristaltic unit outperforms a gear or centrifugal alternative [S5]. The fluid contacts only the tubing wall, so contamination risk drops and the pump can run dry without seal damage [S5].
Service Map: Where a Peristaltic Pump Fits in a Power Plant
Power-generation process pumps fall into five tip-groups: boiler-feed, cooling-water, condensate, ash/slurry, and chemical-injection, and a peristaltic unit only belongs in the latter two [S7]. Boiler-feed and condensate service stay on multistage centrifugal designs, while ash sluice, fly-ash slurry, lime-milk, and polymer flocculant dosing are the natural peristaltic slots. The defining property is that the pumped medium must not touch the rotor, so any fluid carrying entrained solids above roughly 1 to 3 percent by volume, or with pH below 2 or above 12, lands inside the peristaltic use band [S5][S7].
Self-priming behaviour is built into the geometry, so peristaltic dosing skids on hydrazine, ammonia, or amine feed lines can be started dry without a separate priming step [S5]. On FGD (flue-gas desulfurization) limestone slurry loops, the same property removes the flooded-suction piping that a centrifugal pump would otherwise need. Inside the peristaltic pump reference page, the same boundary between positive-displacement hose pumps and rotary-lobe or gear pumps is described in more detail.
Selection Criteria: Flowrate, Pressure, Tubing, and Motor
The four specifications that drive a peristaltic-pump datasheet are flowrate, discharge pressure, tubing Shore A hardness, and drive-motor type, with secondary inputs of suction lift, hose bore, and number of rollers [S1][S2]. For power-plant service, the typical flow window sits between 0.1 and 50 m3/h, discharge pressure between 2 and 16 bar, and a 2-roller or 4-roller head depending on whether the priority is flow smoothness or pressure capability [S1][S3].
Tubing material is the single most failure-prone decision: Grayline's general guideline is to keep Shore A hardness between 50 and 65, because harder tubing loads the motor and shorter hose life, while softer tubing balloons under backpressure and bursts at the discharge check-valve [S2]. In a power plant, the six realistic tubing options are peroxide-cured silicone, TPV, TPE, Viton rubber, and two grades of flexible PVC; chemical dosing of sodium hypochlorite or sulfuric acid typically lands on peroxide-cured silicone or Viton, while ash-slurry service on heavy-wall natural rubber [S2].
Drive-motor selection is the second lever. AC induction motors dominate fixed-speed ash and lime pumps, DC or stepper motors are reserved for variable-speed chemical metering where turndown of 100:1 is required [S6]. The two roller geometries inside the power mixer and power supply reference pages map to the same drive electronics a plant engineer would reuse for a 4-20 mA-controlled dosing skid.
Drive Electronics, Power Wiring, and Control Integration
A 4-20 mA analog loop with HART, or a fieldbus position (PROFIBUS PA or Foundation Fieldbus) is the typical control interface, paired with a VFD on the AC drive for variable-speed slurry service [S1][S6]. A peristaltic pump draws its motor current through a power cable run sized for the inrush of the drive, and the cabinet it lands in is fed from a power distribution bus already protected against harmonics from other VFDs in the plant.
Power consumption is a frequently underestimated variable. Large-roller hose pump designs cut energy use by up to 30 percent compared to smaller-roller geometries, which is material on a 24/7 ash-sluice duty [S3]. For metering pumps on a hydrazine or ammonia skid, the pump is normally powered from a 24 VDC or 110 VAC control tap on the power supply rail, with a power meter on the feeder for energy trending.
Tubing Material Comparison: Silicone, TPV, Viton, and Natural Rubber
The four tubing materials a power-plant buyer most often compares are peroxide-cured silicone, TPV, Viton fluoroelastomer, and natural rubber, lined up against three decision criteria: chemical compatibility, temperature ceiling, and abrasion resistance [S2].
Peroxide-cured silicone covers roughly -40 to 200 degrees C, is the cleanest choice for hydrazine and amine dosing, and has moderate abrasion resistance, so it loses to natural rubber on ash slurry [S2]. TPV covers roughly -10 to 135 degrees C, is a good mid-cost general-purpose option, and resists many acids and bases but not all solvents. Viton handles -20 to 200 degrees C with strong resistance to hydrocarbons and aggressive oxidizers but at a higher unit cost. Natural rubber stays the default for high-solids ash and limestone slurry where its abrasion resistance is unmatched, but it fails quickly on oils and on oxidizing acids.
Pressure rating follows the same logic: the harder the Shore A value, the higher the burst pressure, but the higher the motor load and the shorter the hose life, so a backpressure filter at the discharge forces a harder tubing choice than the suction duty alone would suggest [S2].
Limitations, Failure Modes, and What to Avoid
Peristaltic pumps lose to gear, centrifugal, and plunger pumps on three measurable axes: continuous dry-run energy cost, maximum discharge pressure, and pulsation level [S5]. Discharge pressure above roughly 16 bar pushes the designer into a hose pump with reinforced hose and 4-roller head, and the cost rises faster than the gain [S1][S3]. Pulsatile flow is intrinsic to the geometry: most hose pumps are software-driven to smooth protocol-based flow variations, and metering accuracy depends on the controller, not the pump body [S4].
Three failure modes to spec against: tubing burst from blocked discharge filter, hose fatigue from running dry at high speed, and roller-shaft bearing failure from under-rated motor torque. All three are addressable by specifying a discharge pressure switch, a current limiter on the VFD, and a nameplate motor service factor of 1.15 or higher. The same risk framework is used on stainless steel pipe installation, where joint method and support spacing are the only spec items that decide between a 5-year and a 20-year service life.
Procurement Signals: Sourcing, Standards, and Spare-Tube Strategy
Specifying a peristaltic pump for power-generation service, the engineering document needs five named items: flowrate window, discharge pressure, tubing material and Shore A value, drive-motor type, and seal/class rating for the plant hazardous-area classification. ISO 5198 covers the test acceptance for positive-displacement pumps in general, while IEC 60079 governs motor selection in classified zones, and ATEX 2014/34/EU applies to European installations [S1][S2].
For ash-sluice and FGD service, the buyer should hold at least two spare hose elements per installed pump on site, since hose life is the dominant maintenance cost and a single blocked-filter event can destroy a hose in under a week. Sourcing from a manufacturer that publishes the recommended tubing brand, hardness range, and burst pressure removes one of the most common commissioning delays, because a peristaltic pump shipped with the wrong tubing on day one usually fails inside the first month.
Procurement teams that already manage stainless steel pipe TCO on the same plant have the spare-parts logistics to handle hose replacement, and the same supplier-evaluation checklist (lead time, datasheet depth, on-site failure data) applies. Track the next maintenance-cycle hose-replacement hours and the energy-per-tonne figure on the ash-sluice pump: those two numbers will tell you within one service interval whether the original selection was right.