Many hydraulic systems use fixed displacement pumps as the primary source of flow. The actual flow that a system attains is the specified pump displacement reduced by the pump's inefficiency. This inefficiency results in lost flow which returns to the tank through an external case drain line. By installing an inexpensive, direct reading flowmeter in the case drain line, the pump's efficiency can be evaluated. Any significant change in the case drain line flow rate acts as an early warning signal on the pump's continuing efficiency.
Tom Kuczenski, a Hedland consultant, says, "Based on experience, many engineers use declining efficiency as a factor to determine the need for a pump rebuild. A typical signal might be a 10-point loss in pump efficiency."
He cites the following example: a 50 cc/rev pump running at 1800 rpm would theoretically flow around 89/90 lpm at the specified rated pressure. At an efficiency of 92% actual flow to the system would be around 81 lpm with the remaining flow of 8 lpm flowing back to tank through the case drain line. However, if the pump's efficiency dropped to 82%, the flow to the system would reduce as case drain flow would increase close to 16 lpm - more than double the drain flow at an efficiency of 92%.
A suitable flowmeter would easily highlight the increased flow through the case drain line. The maintenance team or operator would be able to record flows and establish a trend of the rate of fluid flowing through this line at predetermined intervals. The Hedland EZ View requires no special piping or flow straighteners. It is easy to install, has a polysulfone plastic body, piston and cone and a T300-series stainless spring. The accuracy is within 5% of full scale. To minimise human involvement, an optional electric signal switch, called EZ View Flow Alert is available.
Hydrasales' Cheryl Johnson says that these meters can save owners expensive pump repairs and the resultant downtime by simply installing in the case drain line.
For more information contact Haroun Pochee, Hydrasales, +27 (0)11 392 3736, [email protected]
Making lines safer with smarter connection Hydrasales
Hydraulic systems & components
Imagine connecting multiple hydraulic lines or a combination of hydraulic, electrical and grease lines with one single, confident movement. That’s the everyday convenience operators get from Faster’s MultiFaster multi-coupling systems.
Read more...Hydraulic system upgrades to boost performance and save money CT Hydraulics (Nqoba)
Hydraulic systems & components
Those working with hydraulic or pneumatic systems know that keeping your machinery running at peak performance balances productivity and cost. As systems age, they often become less efficient, requiring more energy and more frequent repairs. The good news is that you don’t always need to invest in an entirely new machine to solve these problems.
Read more...Navigating ISO standards in hydraulic cylinder manufacturing
Hydraulic systems & components
For hydraulics professionals, understanding and leveraging ISO standards is a powerful way to ensure quality and gain a competitive edge. Here is a guide to the most critical ISO standards for hydraulic cylinder manufacturing, showing how to use them to your advantage.
Read more...Heavy impact, smart control Axiom Hydraulics
Editor's Choice Hydraulic systems & components
Every now and then a project lands on your desk that’s equal parts heavy machinery and fine control - a tantalising mix for any engineer. A client approached Axiom Hydraulics with a project exactly like this.
Read more...Hydraulic systems in heavy machinery
Hydraulic systems & components
In this article, we explore how hydraulic systems function, their role in powering heavy equipment, and why they are the preferred choice for industries requiring immense power and precision.
Read more...How manufacturers achieve zero-leakage demands in hydraulic cylinders
Hydraulic systems & components
Imagine a world where your hydraulic cylinders never leaked. The answer lies in a holistic approach that focuses on the fundamental components and their interactions, particularly the cylinder rod and its surrounding environment.
Read more...The seven different types of hydraulic fittings used for cylinders
Hydraulic systems & components
Hydraulic fittings are crucial for maintaining the integrity of hydraulic circuits, Selecting the right type of hydraulic fitting is not only essential for preventing leaks but also for ensuring minimal downtime and enhancing overall system efficiency.
Read more...The seven different types of hydraulic fittings used for cylinders
Hydraulic systems & components
Hydraulic fittings are crucial for maintaining the integrity of hydraulic circuits, Selecting the right type of hydraulic fitting is not only essential for preventing leaks but also for ensuring minimal downtime and enhancing overall system efficiency.
Read more...Powering southern Africa’s industrial evolution for over five decades
Editor's Choice Hydraulic systems & components
Established in 1974, Oilpower is a recognised name in South Africa’s hydraulic and pneumatic sector. What started as a small, family-run business has matured into a highly structured operation with specialised teams, experienced engineers and a reputation for technical excellence and reliability. Oilpower is celebrating its 50th anniversary this year.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version