Hi,
Turbomole uses IBM Platform MPI and it is neither possible nor necessary to run the binaries with any other MPI version. So you do not need OpenMPI at all, I'd recommend to simply unload the module.
It is really completely sufficient to follow the manual and to set the environment variables PARA_ARCH and PARNODES to switch from the serial to the parallel version. If that does not work on your system, just send an email to the Turbomole support.
Cheers,
Uwe