Specification for Drill String Non-return Valves, First Edition, Includes Addendum 1 (2019) HISTORICAL
NORMA vydaná dňa 1.7.2006
Označenie normy: API SPEC 7NRV(R2020)
Dátum vydania normy: 1.7.2006
Počet strán: 26
Približná hmotnosť: 78 g (0.17 libier)
Krajina: Americká technická norma
Kategória: Technické normy API
This standard was formulated to provide the minimum acceptable requirements for Drill String Non-return Valve (NRV) equipment. It covers Drill String Non-return Valves, Non-return Valve Subs, Non-return Valve landing nipples, Non-return Valve Equalizing Heads and all components that establish tolerances and/or clearances which may affect performance or interchangeability of the NRV equipment. Non-return Valve Subs, Non-return Valve landing nipples, Non-return Valve Equalizing Heads and NRVs manufactured by different facilities or manufacturers may be supplied as separate items. See more
Reaffirmed: 2020