Petroleum and natural gas industries. Downhole equipment. Subsurface safety valve equipment1 Scope This International Standard provides the minimum acceptable requirements for subsurface safety valves (SSSVs). It covers subsurface safety valves including all components that establish tolerances and or clearances which may affect performance or interchangeability of the SSSVs. It includes repair operations and the interface connections to the flow control or other equipment, but does not cover the connections to the well conduit. NOTE

hang gliding

test procedures and other information relating to non-oriented and oriented nickel-iron laminations intended for cores for transformer and inductor applications

The dye coupler reactivity test is optional as the results are valid only for the specific colour print product being investigated

as the change in body heat storage depends on clothing and activity as well as the parameters of the climatic environment

f) The results produced by an included floating point operation when one or more argument values are IEC 60559 special values

They may also apply to curved patent glazing and infilling except for the structural design where specialist advice is needed

At very low ratios of pressure differential to absolute inlet pressure (Δp/p1)

These are comparative

BS EN 3475-507 also provides users with a step-by-step procedure for the method

The risk is 10 % of failing to contradict an incorrect declared quality level which is related to the limiting quality ratio (see Clause 4)

2 "Definition of a new overhead line"

these screws are not fully interchangeable with other countersunk ISO metric screws