1.
Industrial Controls Business Unit
Project Execution Group
Capabilities
Wellhead Control Panels
Integrated Packaging Includes WHCP, HPU and RTU
Wilson Mohr Wellhead Control Panels provide hydraulic power to
well shutdown valves. The panel includes manual valves & gauges
for local operation and solenoid valves and pressure switches for
automated action. Controls are provided for the normal sequencing
to open and close the SC-SSV, SSV, wing valve and choke valve. An
ESD switch is used to shutdown the wellhead and prevent escalation
of a hazardous condition.
The HPU includes the hydraulic fluid reservoir, pumps with filters &
valving, and pump motor controls.
An accumulator rack with nitrogen bottles is provided for loss of
electrical power.
Electrical enclosures are IP-65 rated. Electrical connections, junction
boxes and cable glands are rated IEC EExe.
A hand operated backup pump is provided for loss of power
conditions.
Wilson Mohr designs a PLC based control system to monitor
process controls and ESD conditions. Pressure, temperature
and level conditions are measured, along with valve status and
pump operations. Logic assures adequate hydraulic pressure
and volume. Proper sequencing is programmed for normal
opening, closing and ESD conditions.
The PLC communicates status of valves, pump motors and
alarms via ethernet or serial port. Protocols include TCP/IP
and MODBUS RTU.

2.
Industrial Controls Business Unit
Project Execution Group
Logic allows to open/close the SC-
SSV, SSV, wing valve and choke valve
in sequence for normal opening
and closing. ESD will shutdown the
wellhead in appropriate sequence
and timing. Run/stop control for
hydraulic pumps is provided.
Pressure switches monitor
the hydraulic fluid pressure. A
Flammable Gas Detector can be
included in the logic along with
Fusible Plug in hydraulic supply
lines as ESD inputs.
The Wellhead Control Skid uses all stainless steel for valves, fittings,
tubing,pipe and pipe fittings. All gauges and switches have block and bleed
valves. The hydraulic fluid reservoir has separate suction and discharge
filters, a common return filter with fouling indication, an aeration filter and
a filling filter. The hydraulic pumps each have the capacity to charge the
accumulator from empty to full in 120s. The accumulators and nitrogen
cylinders have sufficient capacity for emergency operation of the main
block valve for three strokes. The accumulator has a pressure safety
valve to prevent nitrogen overpressure. The rack has a roof to protect
against direct sunshine.
Houston (HQ)
12610 W. Airport Blvd.
Suite 100
Sugar Land,Texas 77478
800 324 8850
281 295 T 8850
281 295 F 8870
Dallas
800 611 2772
972 943 T 0316
972 312 F 1459
Beaumont
800 324 8850
409 833 F 0056
Corpus Christi
888 639 8362
361 289 T 6630
361 289 F 6566
El Paso
800 611 2772
915 533 F 2264
Denver
800 438 2818
303 384 T 1103
303 384 F 1105
Phoenix
800 238 1260
602 438 F 0047
Salt Lake City
801 214 T 3300
801 214 F 3340
San Diego
858 578 T 7887
858 578 F 4633
www.WilsonMohr.com