If an end user needs the pump to run faster than 40 rpm, then the pump can only be run intermittently. Most large diameter, shoe-design peristaltic pumps are limited to approximately 40 rpm. If it is a large diameter (2.5-inch to 4-inch) peristaltic pump, the speed limit may be because of the heat generated during operation. This type pump typically requires a significant amount of lubricant (usually glycerin) to dissipate the heat and lubricate the dragging action of the shoe against the rubber hose.Įven with the glycerin lubricant cooling the pump and its internals, the pump is limited to how fast it can run. Unfortunately, the dragging action creates a significant amount of friction, resulting in heat build-up within the pump casing and the rubber hose. This is one of the earliest types of designs available. For a better understanding of hydraulic threads, refer to our hydraulics fitting guide here.A shoe-design peristaltic pump typically has two shoes that drag across the rubber hose to create the occlusion of the hose. However, it’s a great idea to start with a hydraulic hose guide here, which helps you determine the right hose for your task. In this instance, you need a 5/8" hose, or dash size 12.Ĭonsider rubber-coated hydraulic hoses with braided steel, which gives you an excellent combination of flexibility and durability. You can see where the line drawn against the straight edge passes the dash-size column. Your recommended flow velocity is 20 feet per second. Intersection on the third vertical line reveals the factor you need.Įxample: Let’s say your desired flow rate is 16 gallons per minute.Lay a straight edge, intersecting those two values.If you know any of these two values, you can determine the third using the nomograph chart below Tubes are measured by O.D.)Ī nomograph is essentially a hose sizes chart.Ĭonsider your correct hose I.D., desired flow rate, and recommended flow velocity. You can find a complete table of dash sizes here. Hose length contributes to head loss due to friction, so don’t make the length any longer than it needs to be.Īlso called dash number, this is an industry standard that indicates your I.D., with each size going up 1/16". Keep in mind that the longer the hose, the more the pressure will drop. Length of hydraulic hose: this is your maximum reach, from end to end. Get it too small, and you can expect excessive pressure drops, leaks and even system damage. will give you a slow, listless system performance.
impacts the flow velocity of the fluid, so getting the measurement correct is critical. Inner diameter (I.D.): The measurement of the empty space inside the hose. It includes the tube, reinforcement, and cover Step 1 Outer diameter (O.D.): This is the measurement of the entire span of your hose cross section. Get the correct diameter for your hose, and you’ll avoid inefficiencies that result in heat generation and excess back pressure in the motor.įollow these three steps that will help you determine the hose size you’ll need for your hydraulic systems: Hydraulic fluid power works effectively with the right size hose.
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