CASE STUDY: ESD Sour Corrosive Service

Chromatic Delivers
Operational Dependability
and Reliability


Initial valve installation was a manual block valve application in a natural gas gathering system immediately off of a natural gas well. Some of these well streams include sour/corrosive media requiring materials of construction suitable for NACE service. The customer uses multiple valve sizes in manual and automated configurations in these applications. The customer determined, after initial test/evaluation, the internal stationary Core design of the HCV product line protected the seats minimizing potential damage from higher velocities and services that could possibly include entrained solids.


The first Valves were tested in March 2008. Eventually the HCV Valves were installed in more demanding, higher flow applications including produced natural gas service including entrained sand. In the case of the ESD (Emergency Shut Down) applications, the valve is required to close and seal bubble tight in emergency conditions to isolate flow from the well into gathering systems. With the internal Core of the valve providing better protection of the seat/seals, and the significantly reduced hydrodynamic torque, the HCV Valve design provides the operation dependability and reliability demanded for ESD services.

Valves Supplied
Size 2″, 3″, 4″ and 6″ ANSI 600 Class
Body Material WCC Carbon Steel
Internals Carbon Steel – Electrolysis Nickel Plated
Trim Teflon seated – NACE Trim
Port Full Port
Connections Raised Face Flanged
Service Conditions
Media Sour natural gas with some entrained sand
Manual/Actuated Pneumatic Spring Close Actuated
Temperature Ambient
Orientation Horizontal
Pressure 1200 psig
Supporting Sour Corrosive Services


The protection of the seat by the stationary core and the comparatively lower hydrodynamic torque provided the customer operational dependability and reliability required in this demanding service.