What is API 7K?

API 7K Spec is a certification that identifies rotary hoses as well as cementing hoses, for drilling operations. Developed to provide a flexible connection between a swivel and a standpipe, this hose features a spiral steel wire reinforcement for strength and flexibility. API 7K rotary Hoses, also known as the kellyhose, are available with either standard or H2S service.

API Spec 7K covers general principles and requirements for new and replacement drilling and well servicing equipment. It also covers hoisting equipment. It also covers choke-and-kill systems. It was last updated on January 29, 1993. You can purchase it at $182 or download a PDF version for free and read it online.