Machinery Components Maintenance And Repair Episode 1 Part 3 ppsx

• Resolve deviations from plan

• Verify machinery alignment

• Supervise test runs

• Restart per startup instructions

Mechanical Supervisors/Planners

Planners, and also mechanical and maintenance supervisors provide

machinery related data and support to the senior machinery specialist and

turbotrain T/A engineers involved in planning and execution of turbotrain

turnarounds.

Again, nine months before the scheduled shutdown for a major

machinery T/A, planners and mechanical supervisors will be given

initial guidance on anticipated duties and responsibilities prior to

and during the actual T/A. From then on, typical action and timing

would be:

Nine Months Before T/A:

• Maintenance personnel forward machinery-related work lists to

senior machinery specialist for review

• The most probable work zone outline (see pages 394–400, Volume I

third edition, 1998) is drawn up and forwarded to the senior machin￾ery specialist

• The mechanical supervisors instruct the spare parts coordinator to

assemble up-to-date tabulation of spare parts presently on hand for

major machinery trains. After review, they forward the tabulation to

the senior machinery specialist.

Eight Months Before T/A:

• The spare parts coordinator and maintenance personnel receive the

senior machinery specialist’s request to:

1. Place a “hold” on selected parts

2. Order additional spare parts

In response, they issue purchase orders for additional replacement

parts.

• Next, maintenance supervisors commence dimensional checking

of selected (existing) spare parts per request made by the senior

machinery specialist. The results should be documented within eight

days.

• Dimensional checking has frequently shown serious discrepancies in

parts designation, dimensional configurations, and tolerances. These

must be identified early if a smooth turnaround is to result.

40 Machinery Component Maintenance and Repair

Six Months Before T/A:

• Maintenance personnel arrange for vendor assistance

• Maintenance personnel also work up a more definitive work zone

arrangement and commence tabulation of detailed work list for each

zone

• Maintenance or technical department personnel witness check bal￾ancing of major turbomachinery rotors

• Assemble tools and identify missing tools

• Arrange for scaffolding, etc.

• Forward data to senior machinery specialist regarding status of spare

parts ordered six months earlier

• The planner should now provide final work zone arrangement and

detailed work list for each

One month before T/A, maintenance planners or mechanical supervisors

provide bar chart diagrams for machinery-related T/A work.

• They participate in a meeting with the senior machinery specialist

and designated turbotrain T/A engineers

One week before T/A, mechanical supervisors commence meeting with

designated turbotrain T/A engineers for briefings on matters relating to

machinery work.

Specific Preparation and Planning

When preparing for an overhaul of a major piece of turbomachinery,

it is important to know as much as possible about the machine and why

it needs to be taken out of service. There are several obvious sources

of information, including the operating and maintenance personnel,

the equipment file folder and the vibration history record. If sufficient

information is not found in the file folder, which is all too often the

case, this fact should reinforce the resolve to do a proper job of docu￾menting the planned overhaul in a special manual or “machinery T/A

package.”

Before proceeding, one question usually arises: Is a complete overhaul

really necessary? To properly answer this question, you will need to eval￾uate the symptoms. Has the vibration steadily increased over a long period

of time or have you witnessed a step change? What does an analysis of

the vibration signature reveal? Has the performance gradually fallen off

or taken a dramatic drop? Problems such as a locked gear coupling or

soluble deposits inside the machine can sometimes be corrected without

opening the machine and at a considerable savings of time and effort.

Maintenance Organization and Control for Multi-Plant Corporations 41