Plant Operation and Maintenance

Plant Operation and Maintenance


Plant operation is basically the compilation of the processes through which gas processes and delivered to different companies.

But the question is how the gas processes at an optimum pressure and temperature. Is the gas process needs some machinery to do so??

The answer is yes.

Some gas processes needs some machinery to go through to deliver the desired output but not every process needs machinery to do so.

As I am a Mechanical Engineer my job is to maintain the machinery in order to run the processes smoothly without any interruption.


Machinery at Qadirpur Gas Field


Qadirpur gas field is operated through variety of machines. Machines are categorized on many factors but we will only discuss about some of those which are directly related to Qadirpur gas field. Machines at Qadirpur gas field are enlisted below:


  1. Turbines
  2. Compressors
  3. Blowers
  4. Engines
  5. Pumps
  6. Air Coolers
  7. Heat Exchangers
  8. Heaters.
  9. Propane Condenser




Turbines are used for permeate compression of the gas. At Qadirpur gas field we have 7 turbines but of different manufacturers. All of them are coupled with HP and LP Compressors for the most compression or I can say that desired compression can be achieved thorough those compressors. The gas turbine depressurizes high-energy exhaust gas, thus converting thermal energy into mechanical energy. The mechanical energy generated by the gas turbine is used to drive the machine train. The gas turbine is supplied with the required fuel via a fuel gas system

At Qadirpur gas field we have two trains

  1. PT-1 (K-2701)
  2. PT-2 (K-2711)

Both the trains are of permeate compression but their functioning depends directly on our desired conditions. Both the trains of permeate compression K-2701 and K-2711 are provided. Each train consists of a single shaft, two casings, and four stages centrifugal compressor, driven by gas turbines.

(Man Turbo & Nuovo Pignone)

3 of them are getting input right after the 14 compressor unit discharges the compressed gas after extracting from the headers.  (Solar Turbines)


7 Turbines


  1. Man Turbo
  2. Man Turbo PT-1 & PT-2 Trains (Permeate Compression)
  3. Nuovo Pignone
  4. Nuovo Pignone
  5. Solar Turbine
  6. Solar Turbine Front End Compression Unit (FECP)
  7. Solar Turbine

Solar Turbines (A, B, C)


There are 3 solar turbines installed at FECP (Front End Compression Unit) which sucks the gas right after the gas discharges from the slug catcher and compresses it to an optimum pressure. After compression gas is directed to Inlet Separators

(V-9000-A, V-9000-B, V-9700 A V-9700-B). There are 4 inlet separators, 2 of them belong to PT-1 and 2 of them belong to PT-2. As the functioning of both trains depends on the pressure of the gas from the headers so we use only one train at a time now-a-days.

Inlet separators are divided for trains, 2 of them for PT-1 and 2 of them for PT-2.

One of the turbines out of the three works as a Standby so it is when any of them gets stuck or produce any kind of maintenance or tripping we can use that standby to run the operation smoothly without any kind of interruption.



            Solar Turbines (A, B, C)



Company Name Equipment Name Area of Machine Equipment ID
OGDCL Solar Turbines FECP( Front End Compression Unit) Mars 100-1500





Turbine type Gas Turbine
Bearing type used Journal Bearing

Thrust Bearing

No. and configuration of bearings on each stage P/n = 1006913-1

P/n = 990467C1

No. of stages 4
Coupling P/n= 197422-1 (Mars-100)


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