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Zhejiang Ou Sen Pump Co., Ltd. how to use the life-cycle method to operate and maintain the pump?

Over the past 30 years, state based maintenance (CBM) has been discussed in many topics by the people concerned and is used in a variety of forms in most industries.

But to what extent do people understand the real meaning of CBM? Do many companies make the best use of their CBM programs? This article discusses how

Actively predict maintenance strategies by mastering small changes in the machine's operation to meet the specific needs of each pump group, and strive for financial preconditioning through predictive maintenance.

Check and approve.

1. Preface

"If it is not bad, do not repair it" - this is a mantra of laymen, managers and engineers. Sometimes such words may also come from experienced people.

They believe that the harm of an old device is more harmful than profit; there is a common view that there is a lack of relevant skills or knowledge to deal with obsolescence.

As a result, the quality control process is not performing well, and the equipment renewal is not guaranteed. Finally, a big problem for engineers is how to reach a conclusion.

Convincing data shows that if the pump is not taken ahead of schedule, the pump will be thoroughly damaged.

The author is good at using the life cycle method to use CBM technology for the operation and maintenance of the pump. This article summarizes some of the author's experience in this area, as well as to achieve "the most"

Some methods and steps for reliability and availability of "Jia" pump group.

2. maintenance based on the change of state with time

Many books and papers mentioned the maintenance of pumps according to the state of pump and time varying (TBM). However, the comparison and comparison of the analysis has gone beyond this article

The scope of the range. When considering the CBM program, the company needs to formulate appropriate maintenance strategy according to the pump's working condition. There are many factors that affect the decision, and every pump should be taken into account.

Specific application situation. The key factors include the following:

* corporate culture

* security

* environment

* availability of maintenance resources

* is the pump essential to the normal work and safety of the equipment?

* spare parts or replacement availability / order to delivery time / cost.

* what is the cost of operational failures and whether it can withstand economic losses caused by operational failures?

* work experience (OPEX) - have you experienced time based failure or random mode failure? As shown in Figures 1 and 2.

* what is the expected failure mode?

* how to optimize the available resources to the maximum extent.

* what parameters can be detected to predict maintenance requirements?

Which conditions mean failure - pump can not operate, seal or oil ring leakage, poor performance or efficiency. The latter is more meaningful for high-power machinery

3. what are the aspects of the 3. CBM?

The success of any CBM project depends on a number of factors, one of which is to select the appropriate parameters for monitoring in order to find out the related phenomena of the potential failure mode.

For the pump group, two of the most common monitoring parameters are vibration and temperature; now there are many mature products on the market that can be collected for these and many other parameters.

Transmission and analysis. Over the past few years, the rapid development of Wi-Fi has enabled people to assemble small and compact instruments to factory equipment located in non hazardous areas.

There is no need to make a lot of investment in infrastructure. (welcome to WeChat: Pump circle) such a system can easily connect to desktop computers, notebooks, even IPAD and intelligence.

These devices can send early warning signals to the relevant personnel, wherever they are, by installing corresponding applications.

With these convenient access technologies, we can easily monitor all kinds of parameters. But without careful consideration of which parameters are closely related to specific applications,

It is easy to get the problem of data overload, and even the illusion of security, mistaken that everything is normal and not aware of the potential warning signals.

3.1 plan target

It is very important to discuss and determine a target suitable for a given device at the beginning of the plan. In order to achieve the ultimate goal of eliminating errors and optimizing total assets,

The problems that need to be considered include which devices can be shut down safely and avoid failures in the work, which equipment is critical to the work, and it needs to be prophylactic and effective.

State based maintenance is used to predict its reliable service life.

The above are two completely different objectives, which require a comprehensive understanding of mechanical behavior and system integration. If there is no clear goal or a correct understanding of the scope of work,

It is often disappointing and frustrating to fail to achieve the desired results. It is also worth mentioning that switching from traditional practices of passive maintenance to fully integrated one-step CBM usually meets.

A great challenge. Therefore, we need some intermediate steps so that we can have time to learn related new technologies, create processing systems, and change traditional practices.

3.2 think about what you want to monitor

Determining suitable monitoring parameters is an important step in establishing the CBM plan. For example, if most of the failures in the past were caused by oil losses or increased bearing loads,

As a result, monitoring vibration parameters alone can not guarantee the protection of pumps, let alone provide useful data for predictive maintenance. So, collect work experience

(OPEX) is the first step in understanding what needs to be explored. High level FMEA (failure mode and effect analysis) can also play an important role in this stage.

It is when there is only a limited OPEX. The typical pump failure modes to be considered are:

* bearing failure

* mechanical seal failure

* failure of oil seal / oil retaining ring

* component breakage (shaft, impeller, coupling, etc.)

* motor / electrical fault

* performance loss

* efficiency loss / consumption of high power

* integrity loss (soft seal or gasket failure)

* loss of material (due to erosion, corrosion, impact, friction, etc.)