MUX Control Systems
Multiplex Control System
2
MUX System - Key Features

Designed and tested for continuous operation in
10,000 feet of water

Designed for a 20-year service life

Designed to minimize maintenance costs,
maximize operating time

Component design is based on 25 years of
proven operational experience

Designed and manufactured in accordance with
API 16D, API 16E
3
MUX System Development

One Year $2,000,000 Development Program

All Subsea MUX POD Components were
prequalified by Testing at 5,000 psi Ambient
Pressure and Low Temperature (+10C/340F)

Subsea MUX POD Electronics Assembly was
subjected to Vibration Stress Testing.

Subsea MUX POD was subjected to Hyperbaric
Testing at 4,000 psi Ambient Pressure and Low
Temperature (+10C/340F)
4
BOP Control Modes
5
Electronic System - Key Features

Modular component design

Dual power supplies for each assembly

Control circuits are in a dual redundant distributed system
design

Control circuit communications are based on the RS-485
industry standard using the Motorola 68360 chip set.

Each control CPU and MMI CPU is isolated from each other,
using 10 Base T for communications.

Embedded data acquisition system which records each event
and alarm.

Data logger which includes permanent storage of data
acquisition information and maintenance data base.
6
Embedded Electronics VS PLC

Size and weight of sub sea package.

Minimize heat generated by electronics package

Increased capability

Increased system reliability due to continuous
monitoring of key system parameters.

Customized interfaces (i.e. - DP System).
7
System Software

User interfaces:



Traditional Driller’s panel with lighted push
buttons
CCU System monitor with Windows 95 type
interface
API Alarms
8
Operating Systems

Control:
VX Works

Display/MMI:
Windows NT/95
9
Programming Languages

Control
C

MMI/Display
Visual Basic

Surface Communications:
Hydril MODBUS

Subsea Communications:
Set
HAYES Modem
10
Central Control Unit (CCU)
11
CCU

Integrated console with Redundant Stations:

Backup Control

System Monitoring

System Diagnostics

Intuitive design and layout for “at a glance” total system status

Failsafe design / not MMI dependent

Custom Interfaces for:

Electronic riser angle

Riser recoil system

Custom RS-232 or RS-485 inputs/outputs
12
CCU Display
13
Driller’s Panel
14
Driller’s Panel

Micro-processor based / multiplexed with the
CCU

Standard packaging for user familiarity

Color coded labeling

Meets hazardous location requirements

API Alarm monitoring

System status monitoring
15
Tool Pusher’s Panel
16
Subsea Control Pod
17
Subsea Pod

84 Hydraulic Ports

96 Functions

20 Year Design Service Life

Retractable Stab Design for Guide Line and
Guide Lineless Operation

E/H Unit and Hydraulic Unit are interchangeable
18
Subsea Pod
E/H Unit
Hydraulic
Unit
19
Subsea Pod E/H Unit
Sub Sea
MUX Cable
Connector
Sub Sea
Electronics
Sub Sea
Transformer
Pressure
Compensated
Solenoid Housing
Shear Seal
Pilot Valves
Solenoids
Pressure
Transducers
One Atmosphere
Base
Hydraulic Seal
Sub J-Plates
20
Subsea Pod E/H Unit

All exposed metalic components are manufactured
from 316L SS, Nitronics 50/60, or 17-4/7PH.

All penetrations into one atmosphere base have
redundant o-ring seals and a test port

All external electrical connectors have redundant
o-ring seals with test ports

All electrical wiring subjected to sea pressure has
dual pass EPC wiring with boot seal terminations.
The wiring assemblies are encased in an oil filled
pressure compensated jacket
21
Shear Seal Pilot Valve




Body constructed of 316L SS and Nitronics 50/60
materials
Seals are Nickel Carbide
Solenoid is rated for 60VDC, 30 watt continuous
operation
65 pound pull in force
22
Subsea Pressure Transducer




Body and housing are constructed of 316L SS
Absolute Pressure range of 0 psi to 10,000 psi
Uses measured sea head pressure to determine relative
pressure
Unit is interchangeable by removing four bolts
23
Subsea Electronics Module

Redundant Electronics Modules

Redundant Power Supplies

Low package density

Low power consumption

High Amperage Hypertronic
Connectors which are keyed and
positive locked
24
Subsea Pod Hydraulic Unit
Reference
Accumulators
SPM Valves
BOP Stack Stab
Cylinder
Hydraulic
Regulators
Solid Hydraulic
Manifolds
Pilot Circuit
Hydraulic Filter
Shuttle
Valves
Flow Meter
25
Subsea Pod Hydraulic Unit

All Subsea POD components are manufactured from 316L SS,
Nitronics 50/60, or 17-4/7PH.

Hydril Wedge Block Dynamic Seals (1/2”, 1”, & 1 1/2”)

No Hosing, all hydraulic connections are hard piped or made
through the Hydril Stab Block.

Spent BOP fluid is captured to bath all components in the spent
fluid instead of sea water.

LMRP Disconnect has a positive read back through a
mechanical pin actuated Pilot Valve/Pressure Transducer.

Optional 4 pin wet make/break electrical connector in stab to
provide power and signal to stack mounted electronics.
26
Subsea Hydraulic Regulator

Body and major
components are 316L SS
and Nitronics 50/60

Nickel Comaloy Coated Seal
Surfaces with Nickel
Carbide Seals

240 GPM Maximum
Measured Flow Rate

Dead Band <40 pounds
27
Subsea SPM Valve






Body, Cage, and Spool Components are Nitronics 50/60 and
316L SS
Springs are Inconel
Three sizes, 1/2” - 1” - 1 1/2”
Low Interflow Cage design
Individual Body Housings manifold mounted
No hose connections, uses dual o-ring SAE Flange
connections
28
Hydraulic Power Systems
29
Hydraulic Pumping Unit





Stainless Steel Check Valve on Outlet
1 Quart Surge Bottle
All piping is 316L SS
All hydraulic connections are welded or SAE Flanged
Unit is laid out to maximize maintainability
30
Hydraulic Filter





Hydraulic Filter rated for 5,000 psi Operating Pressure
316L and Nitronics 50/60 Construction
200 psi Automatic By Pass
Multiple size filters available
Same filter assembly is used on Stack and on Surface
Hydraulic Power Unit
31
Accumulator Bottle Rack

6,000 psi 15 gallon top
loading bottles

Available in 10 bottle
racks, 12 bottle racks, 16
bottle racks, and 20
bottle racks

Blanking Plates available
for odd numbers of
bottles in rack

Each manifold can be
isolated and has a gauge
showing manifold
pressure
32
Accumulator Bottle Rack




Bottle Fluid Port is a Code 62 SAE Dual O-ring
connection with four bolt retaining flange
Manifold header is machined from a solid bar of 316L SS
No NPT screwed connections
316L SS Drip Pan with drain plug
33
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