Dear nicolas,
I have to run and will send the output once it is over. So no problem to our production database is there right with the implementation of this commands 
use master
go
disk resize name ='saptempdb_data_001' , size='3G'
go
alter database saptempdb log on saptempdb_data_001 = '1G'
go
alter database saptempdb on saptempdb_data_001 = '2G'
go
Best regards,
venkat