There is no need for high-level access for internal maintenance or lids with an above ground WPL Hybrid-SAF vessel.  However an Access Platforms may be requested by a client so they can view the wastewater treatment process through gridding.

Technical drawing example:

 

WPL custom designed access platform

Custom designed Platform Access at utility wastewater treatment works

great-glen-severn-trent-water-site-with-wpl-n-saf-nitrifying-saf-ammonia-process

image of a WPL steel NSAF modular wastewater treatment plant installed at Danesmoore wastewater treatment works