applications where there are shock loading and frequent starts and stops, boundary lubrication is preferred. Additives like extreme pressure (EP) or anti-wear (AW) protect surfaces where a full film cannot be accomplished because of load, speed, or other factors. These additives form sacrificial layers of protection by clinging to the surfaces, preventing wear. When surfaces are contacting in such a way that only an EP or AW layer will protect them, boundary lubrication must be used. However, this is not the ideal situation because of high heat, friction, and other undesirable effects.
In applications where you need both boundary and hydrodynamic lubrication, you can employ mixed lubrication. In this application, most of the surfaces are separated by a lubricating layer but the asperities will still come in contact. Because of this, you will need to employ additives.
Only with an understanding of the process will it be easy to determine which lubricants to use. The determination is between separating the surfaces or protecting them from friction, heat, wear, and other issues. Using oils, grease, gas, or other fluids will accomplish this. Next time you change the oil in your car, understand that there is a lot more going on than meets the eye.
When making the decision to undertake any project, you must understand what constraints you have. The constraint can be displayed as a triangle. A graphical representation of this decision making is shown in Figure 2.2. One leg of the triangle is costs, the next is time, and the final one, quality. The middle of the triangle is traditionally risk. I like to look at these projects with an eye on the opportunity and not the risk. All projects have associated risk and opportunity. Your job is to look at the risk and mitigate it to the best extent possible, or to look at the opportunity and maximize it.
My recommendation to all organizations is to never compromise on quality. This is always the approach I take. If I cannot do it with the quality I set, then I will not undertake the project. For me, the decision on how to approach the project comes down to cost and time. If cost is the determining factor in your organization, then it will take more time. The reverse is also true: if you want results in a quicker time, then the costs will increase. The decision on costs and time needs to be made by looking at the opportunity. Organizations that keep their eye on the opportunity will gain a competitive advantage over their competitors.
Figure 2.2 Project Decision Making.
When determining how much the potential savings will be when you undertake a lubrication project, you can use detailed information from your computerized maintenance management system (CMMS) or other cost tracking system or industry standards. Most organizations lack the detailed information to calculate the cost of not having a strong lubrication program, so I normally use percentages I have gathered throughout my experience. If your organization does not gather this information, you will need to determine potential savings.
ROI CALCULATION
Конец ознакомительного фрагмента.
Текст предоставлен ООО «ЛитРес».
Прочитайте эту книгу целиком, купив полную легальную версию на ЛитРес.
Безопасно оплатить книгу можно банковской картой Visa, MasterCard, Maestro, со счета мобильного телефона, с платежного терминала, в салоне МТС или Связной, через PayPal, WebMoney, Яндекс.Деньги, QIWI Кошелек, бонусными картами или другим удобным Вам способом.
