Hello Sarah.
At our Trust, we are about to start an equipment library. We considered all the possible "homes" for the library and firmly decided on EBME.
Can you use any of these arguments:
1. Medical (electrical) equipment and cleaning

,
2. Electrical safety checks

,
3. Set-up configurations for infusion devices

,
4. Staff training

,
5. etc.
No disrepect to porters or cleaners (they are surely needed!), but have you seen the state of hospital walls/ corridors! In our Trust, most equipment control numbers may be found "in-printed" in our new plaster board walls!
As with the other e-mail replies, EBME is the best home for the equipment library.