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ABOUT COMPANY
            Main Company activities are servicing, maintenance and Installation of power Plants and Electrical Power generator sets. Also we offer transport services for generators and heavy machines. We have experienced professional for Building electrical Installations.

 

VISION
            To be trusted and best service provider for Power Generation Industry not only covering aspect of consultancy, service installation maintenance of power plant and electrical generators but also Electrical Installations to full customer satisfactions.

MISSION
            Customer’s ideas and advice on our all activities including consultancy, service and maintenance are processed in such a way that it will give best end result beyond customer expectation

 

 

CONSULTING ON MAINTENANCE
            Muhima & Company Limited offers advise to various clients on the best way of Planning, conducting and choosing correct type maintenance.

TRANSPORT ATION OF VARIOUS GOODS
            Company owns various types of vehicles for the purpose of transporting goods and various machines even with heavy weight to various locations in Tanzania. Also vehicle with cranes are for the purpose of not only transporting goods but also lifting heavy Loads.

SUPPLYING OF ELECTRICAL AND MECHANICAL
            Due to the nature of our business we import various types of electrical and mechanical parts to be consumed on our projects. The excess are sold to who ever needs.

BUILDING ELECTRICL INSTALLATION
Muhima & Company Limited company have professional and experienced staff in doing electrical installation. Also Muhima & Company Limited own very sophisticated and modern equipment for various Electrical Installation Projects.

ERECTING POWER PLANTS
            Muhima & Company Limited have Good Experience in Erecting Gas and Diesel Power Plants, among plants muhima erected are Artmus Gas Power Plant Mtwara, ZECO Diesel Power Plant in Zanzibar

 

MAINTENANCE ACTIVITIES
Activities of maintenance function could be either repair or replacement activities, which are necessary for an item to reach its acceptable productivity condition and these activities, should be carried out with a minimum possible cost.

MAINTENANCE OBJECTIVES
Maintenance objectives should be consistent with and subordinate to production goals.
            The relation between maintenance objectives and production goals is reflected in the action of keeping production machines and facilities in the best possible condition.                      

1. Maximising production or increasing facilities availability at the lowest cost and at the highest quality and safety standards.
2. Reducing breakdowns and emergency shutdowns.
3. Optimising resources utilisation.
4. Reducing downtime.

Improving spares stock control

1. Improving equipment efficiency and reducing scrap rate.
2. Minimising energy usage.
3. Optimising the useful life of equipment.
4. Providing reliable cost and budgetary control.
5. Identifying and implementing cost reductions.

Types of Maintenance of maintenance done on Power Plants/or Electrical power generator set by Muhima & company Limited are:

1. Run to Failure Maintenance (RTF)

     The required repair, replacement, or restore action performed on a Power plant/ or Electrical Power generator set after the occurrence of a failure in order to bring the malfunction power plant/ or electrical power generator set to its working condition.

1. It is subdivided into two types:
1. Emergency maintenance: it is carried out as fast as possible in order to bring a failed Power plant/ or Electrical Power generator set to a safe and operationally efficient condition.
2. Breakdown maintenance: it is performed after the occurrence of an advanced considered failure for which advanced provision has been made in the form of repair method, spares, materials, labour and equipment.

Disadvantages Of Run To Failure maintenance:

1. Its activities are expensive in terms of both direct and indirect cost.
2. Using this type of maintenance, the occurrence of a failure in a component can cause failures in other components in the same equipment, which leads to low production availability.
3. Its activities are very difficult to plan and schedule in advance.

Run To Failure Maintenance is useful in the following situations:

1. The failure of a component in a system is unpredictable.
2. The cost of performing run to failure maintenance activities is lower than performing other activities of other types of maintenance.
3. The equipment failure priority is too low in order to include the activities of preventing it within the planned maintenance budget.

1. Preventive Maintenance (PM)

It is a set of activities that are performed on power plant/ or electrical power generator set before the occurrence of a failure in order to protect them and to prevent or eliminate any degradation in their operating conditions. This maintenance is carried out at predetermined intervals or according to prescribed criteria and intended to reduce the probability of failure. Preventive maintenance is usually planned by calendar system or by running hours of power plant/ or electrical power generator set.
The advantage of applying preventive maintenance activities is to satisfy most of maintenance objectives.

Muhima & company Limited making sure that Preventive maintenance is done with best efficiency:

1. Muhima & Company Limited have an adequate number of staff in the maintenance department to tackle all maintenance in time hence give customer service beyond expectation.
2. Muhima & Company Limited recommend right choice of power plant/ or electrical power generator set that is suitable for the working environment and that can tolerate the workload of this environment.
3. Muhima & company limited have staff with good technical qualifications and skills, also training are provided to update technical staff with new technology.
4. Muhima & company limited executive management support and have commitment to the PM programme.
5. Muhima & company limited doing proper planning and scheduling of PM programme.

Preventive maintenance is good for those power plant/ or electrical power generator set that which their failure would cause serious production losses.
Its aim is to maintain power plant/ or electrical power generator set that in such a condition that breakdowns and emergency repairs are minimised.
Its activities include replacements, adjustments, major overhauls, inspections and lubrications.

Preventive maintenance are subdivided into different kinds according to the nature of its activities:
Routine maintenance which includes those maintenance activities that are repetitive and periodic in nature such as lubrication, cleaning, and small adjustment.
Running maintenance which includes those maintenance activities that are carried out while the power plant/ or electrical power generator set is running and they represent those activities that are performed before the actual preventive maintenance activities take place.
Opportunity maintenance which is a set of maintenance activities that are performed on a power plant/ or electrical power generator set when an unplanned opportunity exists during the period of performing planned maintenance activities to other power plant/ or electrical power generator sets.
Window maintenance which is a set of activities that are carried out when a power plant/ or electrical power generator set is not required for a definite period of time.
Shutdown preventive maintenance, which is a set of preventive maintenance activities that are carried out when the production line is in total stoppage situation

1. Corrective Maintenance (CM)

In this type, actions such as repair, replacement, or restore will be carried out after the occurrence of a failure in order to eliminate the source of this failure or reduce the frequency of its occurrence.
This type of maintenance is subdivided into three types:
Remedial maintenance, which is a set of activities that are performed to eliminate the source of failure without interrupting the continuity of the production process.
Deferred maintenance, which is a set of corrective maintenance activities that are not immediately initiated after the occurrence of a failure but are delayed in such a way that will not affect the production process.
Shutdown corrective maintenance, which is a set of corrective maintenance activities that are performed when the production line is in total stoppage situation.

The main objectives of corrective maintenance are the maximisation of the effectiveness of all critical plant systems, the elimination of breakdowns, the elimination of unnecessary repair, and the reduction of the deviations from optimum operating conditions.
The difference between corrective maintenance and preventive maintenance is that for the corrective maintenance, the failure should occur before any corrective action is taken.
Corrective maintenance is different from run to failure maintenance in that its activities are planned and regularly taken out to keep power plant’s or electrical power generator in optimum operating condition.
The way to perform corrective maintenance activities is by conducting four important steps:
            1. Fault detection.
            2. Fault isolation.
            3. Fault elimination.
            4. Verification of fault elimination.
            In the fault elimination step several actions could be taken such as adjusting, aligning, calibrating, reworking, removing, replacing or renovation.

1. Corrective maintenance has several prerequisites in order to be carried out effectively:

1. Accurate identification of incipient problems.
2. Effective planning which depends on the skills of the planners, the availability of well developed maintenance database about standard time to repair, a complete repair procedures, and the required labour skills, specific tools, parts and equipment.
3. Proper repair procedures.
4. Adequate time to repair.
5. Verification of repair.

 

1. Improvement Maintenance (IM)

It aims at reducing or eliminating entirely the need for maintenance.
This type of maintenance is subdivided into three types as follows:
           

1. Design-out maintenance which is a set of activities that are used to eliminate the cause of maintenance, simplify maintenance tasks, or raise power plant or electrical power generator set performance from the maintenance point of view by redesigning those power plant or electrical power generator which are vulnerable to frequent occurrence of failure and their long term repair or replacement cost is very expensive. This type of maintenance are done by manufacturer of power plants and electrical power generator after receiving information from users.
2. . Engineering services which includes construction and construction modification, removal and installation, and rearrangement of facilities.
3. Shutdown improvement maintenance, which is a set of improvement maintenance activities that are performed while the production line is in a complete stoppage situation

1. Predictive Maintenance (PDM)

Predictive maintenance is a set of activities that detect changes in the physical condition of equipment (signs of failure) in order to carry out the appropriate maintenance work for maximising the service life of equipment without increasing the risk of failure.
It is classified into two kinds according to the methods of detecting the signs of failure:

1. Condition-based predictive maintenance
2. Statistical-based predictive maintenance

Condition-based predictive maintenance depends on continuous or periodic condition monitoring equipment to detect the signs of failure.
Statistical-based predictive maintenance depends on statistical data from the meticulous recording of the stoppages of the in-plant items and components in order to develop models for predicting failures.

The drawback of predictive maintenance is that it depends heavily on information and the correct interpretation of the information.
Predictive maintenance are classified as a type of preventive maintenance.
The main difference between preventive maintenance and predictive maintenance is that predictive maintenance uses monitoring the condition of power plant or electrical generator to determine the actual mean time to failure whereas preventive maintenance depends on industrial average life statistics

 

MEMBERSHIP
Contractor association of Tanzania (CATA) Registered at Tanzania Investment Centre for a period of two years.

Registered by Tanzania Contractors Registration Board in Building Contractors Class Seven (VII)

 

EMERGENCY WORKS RESPONSE

Standby team for generator sets emergency works are available 24/7
Vehicles are provided for technical staff to assist fast response to site.
Due to heavy traffic at Dar es salaam City Muhima have bought motor cycle to assist fast reaching site during heavy traffic.
Muhima & company Ltd have branches at Arusha, Mwanza and Mbeya to assist fast attending emergency works at Upcountry sites. We are considering increasing number of branches as per needs