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Plant Maintenance

This Plant Maintenance articles series relates to doing maintenance and care on operating plant and equipment. It includes coverage of maintenance engineering issues, and topics on the maintenance of process plant operating assets and industrial equipment.


The Plant Maintenance series of articles are provided with the permission of Feed Forward Publications and Lifetime Reliability Solutions.


NOTE: The series does not include coverage of related commercial or vendor software or database management applications.

by Mike Sondalini Leave a Comment

Safety Shower Installations

Safety Shower Installations

Safety showers and eyewash stations are installed when dangerous goods are present. The shower installation has to meet recognised standards like American National Standard Z385.1. This article notes the key requirements for safety shower installations and discusses some practical issues.  [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance Tagged With: safety, Workplace Safety

by Mike Sondalini Leave a Comment

Static Electricity Basics

Static Electricity Basics

Static electricity is the build-up of opposite polarity (positive and negative) electrical charges on two different substances in contact by the movement of one surface across the other. The spark that can occur from static build-up is the result of the opposite charges neutralising themselves when the electrical field between them becomes strong enough to overcome the gap resistance.  [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance

by Mike Sondalini Leave a Comment

How Accounting Policies Affect Maintenance Costs

How Accounting Policies Affect Maintenance Costs

Accounting decisions can greatly affect maintenance costs. Two examples are the decision to purchase items as maintenance or capital and plant item asset numbering.

Maintenance costs are expensed in the financial year incurred and are claimed as a tax deduction at the company tax rate (soon 30% in Australia) in the year they are spent. Capital expenditure, on the other hand, is depreciated and can only be claimed as a tax deduction over the usable life of the equipment. Depending on the industry, the depreciation rate for industrial equipment is 20% per year. It can be as little as 2.5% per year for office buildings. There is a clear tax advantage to claim as much expenditure as possible as a maintenance cost and not a capital cost.  [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance

by Mike Sondalini 6 Comments

Metal Fatigue Failure

Metal Fatigue Failure

Metal Fatigue Failure Theory and Design Considerations

This article is a basic introduction to the mechanism of metal fatigue failure where parts break after a period of time in service. Explanations of accepted theories are provided and relevant design practices to reduce metal fatigue are presented and explained. [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance Tagged With: failure mechanism, Fatigue, Metal

by Mike Sondalini 1 Comment

Vertical Bulk Liquid Storage Tank Construction and Maintenance

Vertical Bulk Liquid Storage Tank Construction and Maintenance

This article reviews the requirements for building and maintaining vertical, bulk liquid storage tanks. Issues, which affect the care of large storage tanks as well as common problems, are reviewed.

What is a Bulk Liquid Storage Tank?

Bulk liquid tanks can be round, horizontal cylinders, vertical, cylindrical tanks and occasionally spherical vessels. We are concerned here with vertical tanks and vessels whose internal volumes are measured in tens of cubic meters through to hundreds of cubic meters. Examples are oil refinery storage tanks and process chemical storage tanks.

[Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance

by Mike Sondalini Leave a Comment

Proximity Switches

Proximity Switches

A proximity switch is the common name for a range of detectors that generate an electrical signal when a physical mass cuts through their sensor field. Upon detection of an object, the electrical signal is sent to a controlling device and is used to monitor and control the operation of the equipment.

[Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance Tagged With: sensor

by Mike Sondalini Leave a Comment

Predictive Maintenance — What is it?

Predictive Maintenance — What is it?

The practice of maintenance has been developing for the past 300 years. Since the start of the Industrial Revolution machinery and their control systems have played a critical part in our ability to produce consumer and industrial goods. Over that time different maintenance philosophies have developed in response to changing technology and increasing costs.

The progression in philosophies started with breakdown maintenance (BM), then to time-based maintenance such as preventative maintenance (PM) and shutdown maintenance. More recently condition-based maintenance (CM) has become significant. The next step is predictive maintenance. [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance Tagged With: Predictive Maintenance

by Mike Sondalini 1 Comment

Vee-Belt Drives Basics and Considerations

Vee-Belt Drives Basics and Considerations

This article discusses the use of vee-belt drives. It covers some basic theory of friction drives and lists 11 factors to be considered when using vee-belt drives. [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance

by Mike Sondalini 2 Comments

Metal Corrosion Basics and Controls

Metal Corrosion Basics and Controls

This article explains the metal corrosion process including the basic chemistry of how metal loss occurs. Methods to control corrosion are also listed and explained. [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance Tagged With: corrosion

by Mike Sondalini Leave a Comment

Water Hammer and How it is Controlled

Water Hammer and How it is Controlled

When a control valve or manual valve is shut fast in a full pipeline of moving liquid, the liquid comes to a sudden stop. If the pipe suddenly starts banging and thrashing about you can be sure a water hammer was created.  [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance Tagged With: valves

by Mike Sondalini Leave a Comment

Have good valve decontamination practices

Have good valve decontamination practices

This true story could have been a lot worse. A NB100 (4”) flanged plug valve was removed from a 98% sulphuric acid tank nozzle and returned to the supplier. When the valve was opened for inspection at the supplier’s workshop acid was sprayed over the repairman’s legs.

If 98% sulphuric acid lands on skin it immediately boils out the moisture in the skin and burns it. A review of the incident was conducted to learn from the accident and to put corrective measures into place. [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance Tagged With: Valve

by Mike Sondalini 5 Comments

Problems with Peristaltic (Hose) Pumps

Problems with Peristaltic (Hose) Pumps

This article explains the operation of peristaltic (hose) pumps and gives twelve points to be aware of when using them. [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance Tagged With: pumps

by Mike Sondalini Leave a Comment

Electric Motor Problems

Electric Motor Problems

This article presents a basic explanation of electric motor construction and operation along with eleven problems that can be encountered with their use.

Most electric motors in industrial equipment are three phase alternating current induction motors. Induction is the creation of an electric current across a gap. Two types of induction motors are commonly used: squirrel-cage and wound-rotor. The names come from the way they are built.  [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance Tagged With: Electric Motors

by Mike Sondalini 1 Comment

Pulse Jet Bag House Dust Collectors

Pulse Jet Bag House Dust Collectors

In this article on pulse jet bag house dust collectors we cover twelve factors spanning their design and operation.

A bag house dust collector is used to separate dust from a dust-contaminated gas stream. The gas is filtered through bags made of fabric. The fabric traps and filters out the dust while the cleaned gas passes through. The fabric consists of either woven or intertwined (felted) fibres. The bag fibre is selected for its ability to give a long working life within the internal environment of the dust collector.  [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance

by Mike Sondalini Leave a Comment

Components of an Effective Maintenance System

Components of an Effective Maintenance System

If you are ever in the fortunate position of developing a maintenance system from the beginning, the list below will help you focus your efforts. Maintenance systems in small business, develop by default and without much forethought. This list puts together, in one place, the important components of a workable maintenance system. [Read more…]

Filed Under: Articles, on Maintenance Reliability, Plant Maintenance Tagged With: Maintenance Program

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Plant Maintenance series articles provided courtesy of Feed Forward Publications and Lifetime Reliability Solutions.

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