instrument air package 1

[ihuoma2]

hi guys
thanks for the other day, i have another question today pls i was asked to replace the existing instrument air package on 2 platforms and replace the service gas receiver on the other platfom , this new package will supply both instrument and utility air . the equpiments i will be working with are 2x100% compressors , 2x100% dryers sets ( each with two towers) a utility air receiver and an instrument air receiver mounted on a single lift point skid.please i am a bit confused on how to start and i will also need a link to help me start.
thank you

 

[jsummerfield]

Define the volumetric flow capacity in terms of normal and maximum. Define the pressure requirements. Define the required outlet air quality in terms of clenliness, dew point, etc. Advise of nasty compounds in the air such as asphaltines, etc. Define the existing space available for the package. Do you want a dew point transmitter in the instrument air? Advise the ambient extremes and norms.

Does the utility air include start-air for big turbines? If so, the package vendor should know of peak short-term demand. How many start over what period?

What utilities are available? 480 vac 60 Hz? Starters included or excluded with the package? PLC to control the sequencing? Common trouble alarms, other monitoring requirements? Offshore paint? What color? You want it when? What documentation? Are there corporate specifications that apply? ... ...

Start with a short list of packagers and review their packages?

John

 

[Ashereng]

Good summary John.

I would suggest yes to the dew point analyzer. You don't want water in an IA system.

I would also suggest yes to the PLC. The last IA system we bought came complete with everything on a skid. It worked beautifully. The one we did prior, where we did the PLC programming ourselves, not so good.

I like ihuoma2's idea of separate air receivers for IA and UA. A lot of project managers don't see the need to separate them.

 

[quark]

I would like to have compressors connected to a common header and separate dryer + receiver assembly for PA and IA.