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Pump selection guide

ARO offers a full line of Back pressure Need further
extrusion pumps and packages 8,000
that are perfectly designed Back pressure is the friction within a (551) assistance?
to handle virtually any fluid- plumbing system that restricts fluid flow. MODEL PUMP RATIO PAGE
handling application. Our Back pressure increases when fluids are more 1 NP665EC43RX-XX 650698-C43 65:1 8 You have a lot riding on the
products are typically used to viscous or plumbing distance becomes greater. 7,000 2 NP646EC43RX-XX 650692-C43-B 46:1 10 performance of your fluid-handling
move medium- to high-viscosity Other factors include fluid filters, plumbing (482) 3 NP844EC4DR8-XX 650891-C4D-C 44:1 12 system. So, it’s critical that the pump
fluids or materials. elbows, and vertical piping rise. and accessories you choose are not
Viscosity is the biggest challenge Correctly determining back pressure is 4 NP443XP43RX-XX 6712X-P43 43:1 14 only suitable for your application,
in any extrusion application. critical in pump selection. The equation is: 6,000 5 NP423EC43RX-XX 650492-C43-B 23:1 16 but also deliver peace-of-mind
By knowing the viscosity of the ΔP = μ x Q x L x .000245 ÷ (i.d.) 4 (413) 6 NP623EC43RX-XX 650691-C43-B 23:1 16 dependability and precision.
material being extruded, the μ = fluid viscosity (centipoise) 7 NP322XP43RX-XX NM2322X-11-P43 22:1 18 Whether you’re moving a small
flow rate required, line size, and Q = delivery required (gpm) amount of low-viscosity fluid a few
distance from the application, L = outlet plumbing length (ft) 1 feet or a large amount of high-
you’re able to determine the 5,000 viscosity material a longer distance,
pump ratio best suited to .000245 = equation constant (344) ARO has a pump and accessories to
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your needs. (i.d.) = plumbing internal diameter meet your needs.
to the fourth power (in)
Whether you’re transferring, Specialty resins If you need additional assistance
extruding, coating, or dispensing, With back pressure calculated, you can FLOW PRESSURE — PSI (BAR) 4,000 Autobody sealers in selecting the right products
it’s important that you match the then determine pump ratio: (276) 4 2 300,000 cP for your specific application,
right pump with your particular Required ratio = ΔP ÷ psi feel free to contact ARO directly.
application requirements. 3 Greases We’ll get your questions
ΔP = pressure drop within plumbing system
The following chart and back psi = air pressure available at pump 3,000 Silicones answered and your product
pressure calculations will help (207) needs addressed quickly and
make that task easier. Here is an example of calculating back 200,000 cP efficiently.
pressure and pump ratio: Polysulfides (or greater) Contact us
ΔP = μ x Q x L x .000245 ÷ (i.d.) 4 5
2,000 50,000 cP
Plug in the components. (138) Lithographic inks (800) 495-0276
μ = 25,000 cP 6 fluids.ingersollrand.com
Q = .25-gpm (1/4-gpm) 7 Automotive epoxies
L = 150' total 1,000 20,000 cP
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i.d. = .75" (i.d. = .3164") (69)
Acrylic caulks
ΔP = 25,000 x .25 x 150 x .000245 ÷ .3164
5,000 cP
ΔP = 725.9 psi
Ratio = ΔP ÷ psi 1 (3.8) 2 (7.6) 3 (11.4) 4 (15)
ΔP = 725.9 FLOW RATE — GPM (L/MIN)
psi = 85 (at the pump)
Ratio = 725.9 ÷ 85
Ratio = 8.54:1. Round up to 9:1

(800) 495-0276 • fluids.ingersollrand.com
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