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Questions about sizing generator for (multiple) pumpjacks

[ Edited ]

***Mods, please feel free to move this (to the "Oil & Gas - Production" forum?) if you feel this is not the correct forum for this post***

 

G'day,

 

I have a client based in western Canada that is requesting a single natural gas genset to power a well pad consisting of:

 

  • Four (4) x 75HP pumpjacks (identical units)
  • Two (2) x 10HP compressors (identical units)

Equipment will be running 24/7.

Equipment is 3-Phase 480V.

All pumping units & compressors with be on VFD's.

Clean pipeline quality fuel gas.

 

I set the two (2) compressors as non-intermittent loads.

I set the four (4) pumpjacks as intermittent loads due to the "on/off" nature of these devices.

 

The summary shows a peak of about 300kW and a running kW of ~275kW. However, SpecSizer recommended a 423kW G3412 even though it's only 65% utilized. Why wasn't a smaller genset suggested? Did I do something wrong or is the G3412 simply the smallest unit available that will do the job?

 

Any feedback would be greatly appreciated.

 

See below for my SpecSizer settings:

 

01: SITE CONDITIONS

 

01-site-conditions.png

 

02: 75HP PUMPJACKS

 

02-load-list-75hp-pumpjacks.png

 

03: 10HP COMPRESSORS

 

03-load-list-10hp-compressors.png

 

04: LOAD LIST / SUMMARY

 

04-load-list-summary.png

 

05: RECOMMENDED GENERATORS

 

05-genset-recommendation.png

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Re: Questions about sizing generator for (multiple) pumpjacks

Full load +30%
300kw+100kw=400kw
423kw it's ok.