250.445—What are the requirements for kelly valves, inside BOPs, and drill-string safety valves?
You must use or provide the following BOP equipment during drilling operations:
(b)
A kelly valve installed at the bottom of the kelly (lower kelly valve). You must be able to strip the lower kelly valve through the BOP stack;
(c)
If you drill with a mud motor and use drill pipe instead of a kelly, you must install one kelly valve above, and one strippable kelly valve below, the joint of drill pipe used in place of a kelly;
(d)
On a top-drive system equipped with a remote-controlled valve, you must install a strippable kelly-type valve below the remote-controlled valve;
(e)
An inside BOP in the open position located on the rig floor. You must be able to install an inside BOP for each size connection in the drill string;
(f)
A drill-string safety valve in the open position located on the rig floor. You must have a drill-string safety valve available for each size connection in the drill string;
(g)
When running casing, you must have a safety valve in the open position available on the rig floor to fit the casing string being run in the hole;
(h)
All required manual and remote-controlled kelly valves, drill-string safety valves, and comparable-type valves (i.e. kelly-type valve in a top-drive system) must be essentially full-opening; and