Oil and gas production handbook An introduction to oil and gas production

Figure 13. LNG Q/T diagram 
 

---

73 
 
Typical LNG train power use is about 28 MW per million tons of LNG per 
annum (mtpa), corresponding to typically 200 MW for a large trains of 7.2 
mtpa, or 65 MW per stage for three cycles. In addition, other consumers in 
gas treatment and pre-compression add to total power consumption and 
bring it to some 35-40 MW per mtpa, and over 50 for small LNG facilities well 
under 1 mtpa capacity. 
 
Some examples are given here. (Please note that these process flow 
diagrams are simplified to illustrate the principle and do not give a complete 
design.) All designs are shown with heat exchangers to the sea for 
comparison. This is generally needed for high capacity, but for smaller plants 
air fin heat exchangers are normally used.  
 
A triple cycle mixed refrigerant cascade claims to have the highest energy 
efficiency. It is represented here by the Linde design, co-developed with 
Statoil.