Surface-controlled subsurface safety valve (SCSSV)
A downhole safety valve that is operated from surface facilities through a control line strapped to the external surface of the production tubing. Two basic types of SCSSV are common: wireline retrievable, whereby the principal safety-valve components can be run and retrieved on slickline, and tubing retrievable, in which the entire safety-valve assembly is installed with the tubing string. The control system operates in a fail-safe mode, with hydraulic control pressure used to hold open a ball or flapper assembly that will close if the control pressure is lost.
				
				
Inconel 625 is a material with excellent resistance to pitting, crevice and corrosion cracking. Highly resistant in a wide range of organic and mineral acids. Good high temperature strength.
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 Chemical Composition | ||||||||||||
| Nickel | Chromium | Iron | Molybdenum | Columbium + Tantalum | Carbon | Manganese | Silicon | Phosphorus | Sulfur | Aluminum | Titanium | Cobalt | 
| % | % | % | % | % | % | % | % | % | % | % | % | % | 
| min. | max. | max. | max. | max. | max. | max. | max. | max. | max. | |||
| 58.0 | 20.0-23.0 | 5.0 | 8.0-10.0 | 3.15-4.15 | 0.10 | 0.50 | 0.5 | 0.015 | 0.015 | 0.4 | 0.40 | 1.0 | 
| Norm Equivalence | |||
| Grade | UNS No | Euro norm | |
| No | Name | ||
| Alloy | ASTM/ASME | EN10216-5 | EN10216-5 | 
| 625 | N06625 | 2.4856 | NiCr22Mo9Nb | 
 
               By Kitty from Canada - 2018.12.14 15:26
 By Kitty from Canada - 2018.12.14 15:26
               By Merry from Belarus - 2018.08.12 12:27
 By Merry from Belarus - 2018.08.12 12:27