Standpipe Manifold In Oil & Gas Rigs
The standpipe manifold is one of the drilling rig components that is located on the rig floor. From here, the driller can line up the mud pumps to the top drive system or the drilling kelly. This is also where we can fit the manifold gauges that show the driller the mud or the standpipe pressure.

It is essential to inspect the standpipe manifold during the rig acceptance. In addition, testing the standpipe valves should be to the full working pressure for at least 10 mins.
https://www.drillingmanual.com/standpipe-manifold-rig/