LNG Loading Arms: Components, Logics and ERS Training

1. LOADING ARMS TRAINING PACK

Rev 0 30/08/2007
LOADING ARMS TRAINING PACK
COMPONENTS - LOGICS
ALOP
LNG Prigorodnoye
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2.

Index
1. Introduction
2. Niigata loading arm components
3. ERS Logics
1. ESD 1 logics
2. ESD 2 logics
3. Other logics OOS, TOS, loading MOVs
4. QCDC logics
4. ERS testing
5. Overview drawings
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3.

1 Introduction
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4.

Introduction
This presentation is quite long and may require trainer’s
help or use of additional drawings
This presentation is for TRAINING only. Formal
procedures and documents should be referred to for
actual work outside
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5.

Introduction
This training pack summarizes the following key docs for loading arms:
Shell DEP 30.06.10.20 <<ESD systems for loading LNG carriers>>
Niigata loading arm requisition 7000E3427R0102
Niigata loading arm manual 7000E3427M0131 (587 pages)
Niigata loading arm P&I Diagram 7000E3427D052
Niigata Control Narrative 7000E3427S089
Niigata Control logics 7000E3427D071
IPF narrative 7000E346100301
Shell Sakhalin Basic Design Package 4.2
Chiksan Marine Presentation
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6.

2 Niigata loading arm components
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7.

Niigata Loading Arms-Basics
Loadings arms must follow:
•The movement of the ship due to varying weight
•The ship drift // or perpendicular to jetty
•Tides and current
•Associated Control equipment must:
•Supervise loading conditions
•Take quick action in case of emergency
Shell design:
alarm level 1: 2.5m from max reach envelop
alarm level 2: 2m from max reach envelop
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8.

Niigata Loading Arms- overview
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9.

Niigata Loading Arms- overview
A Loading arm consists of:
•Self supporting base riser
•Articulated pipes: 1 inboard arm 1 outboard arm connected to each other and
to the base riser by swivel joints
•Swivel joints allowing the arm once connected to follow freely the movement
of the ship, within the working envelop
•Balancing system: The arm is balanced by 2 counterweights and pulleys so
that it is balanced empty in all conditions w/o any external mechanical
intervention. It moves the arm back on the jetty, after emergency uncoupling
•Hydraulic cylinders to maneuver the arms when they are powered (3)
•Emergency Release System (ERS) consisting of 2 double valves in series
and a hydraulic Emergency Release Coupler
•A Quick Connect/Disconnect Coupler (QCDC)
•Nitrogen/Hydraulic auxiliary hoses running along the articulated pipes
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10. Niigata Loading Arms- overview Schematics 1/2

ERS
QCDC
Niigata Double counter Weight Marine Arm (DCMA)
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11.

Niigata Loading Arms- Swivel joint assemblies
Apex joint
Triple swivel
Trunion swivel
Riser swivel
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12.

Niigata Loading Arms- overview Schematics 2/2
Pantograph Sheave
Apex Removable Elbow
Pantograph Cable
Inboard Drive Cylinder
Outboard Arm
Outboard Counterweight Assembly
Trunion Removable Elbow
Slewing Drive Cylinder
Outboard Drive Cylinder
Riser
Inboard Counterweight Assembly
Niigata Double Counter Weight Marine Arm (DCMA)
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13.

Niigata Loading Arms- Double Counterweight-S
LNG plants are actually equipped with DCMA-S which separates the –160C
product line from the mechanical support structure (no thermal stress, less
costly)
Design of Sakhalin arms:
•Arms 40 mm of ice cover
•Structure 14 mm ice
Design pressure 30bg
Design pressure 19bg
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14.

Niigata Loading Arms- overview- DMCA-S
Prigorodnoye
swivel
2nd Counterweight
(outboard arm)
ERS
QCDC
Main Counterweight
(Inboard arm)
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15.

Loading Arms- ‘Chiksan-Niigata’ Swivel joint
•Convention lubrication of swivels @-160C not possible
•The male part turns in a female coupling on 2 rows of stainless balls which
runs on removable races; each ball is separated by teflon spacer
•Pressure tightness is ensured by 2 special packings
•The ball races are ‘snap-in’ type enabling easy replacement after wear
•Swivel joints are designed to be replaced w/o dismantling of the arm
N2 out
Never let
humidity in
N2 in
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16.

Loading Arms- ‘Chiksan -Niigata’ Swivel joint
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17.

Loading Arms- Swivel joint purging
Swivel joints are made of 2 seals and are purged with a small flow of N2
Always N2 purge @ 0.2 bg pressure
The 3 swivel assemblies are purged in series
You must feel positive flow exiting the last swivel ( style 80)
out
N2 In
N2 to swivels
PCV
out
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18.

Niigata Loading Arms Hydraulic Power unit (HPU)
Combined Hydraulic Power unit and Electrical control panel provide
Hydraulic energy for cylinder actuation
• 2 hydraulic pumps (P3420AB) and oil sump
•Certain control functions to the hydraulics to maneuver the arms (speed,..)
•1 hand pump for maneuvering the arms back to position in case of loss of AC
power
pumps
A3420
Hand pump 18/87

19.

Niigata Loading Arms Hydraulic Power unit (HPU)
Duplicate pumps fed by different feeders
Mode OFF: never starts
Mode ON: always run (and may overheat oil > 65C)
Mode AUTO: motor runs to to charge accumulators
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20.

Niigata Loading Arms- Accumulator unit
Stores hydraulic energy from HPU in case
of loss of AC power for:
• Arm maneuvering (inboard, outboard)
• Emergency uncoupling
(arm full/with ice or empty/no ice)
1 ERS accumulator with N2 backup
2 maneuvering accumulators with N2 backup
(1 for inboard, 1 for outboard)
Per arm total 12
accumulators
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21.

Niigata Loading Arms- Master Solenoid Valve Unit
On each arm, Master Solenoid # 5 is equipped with a lever to enable
uncoupling in case of loss of power
Proximity switch GBZ to confirm activation
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22.

Niigata Loading Arms- Selector Valve Unit (SVU)
A SVU assembly uses solenoids valves to assure the different hydraulic /
electrical functions for each arm
SVU cabinet is located in front of each arm
It is connected by stainless tubes to the HPU
Some solenoid valves:
•# 2 arm selection
•# 3 DBV closure
•# 1 ERS opening
•# 31/32/3334/35/36 arm maneuvering UP/DOWN/LEFT/RIGHT/BACK/FORWARD
•# 37/38 QCDC control
•#43/44 move arm after emergency uncoupling
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23.

Niigata Loading Arms- SVU cabinet right side
Arm
maneuvering
solenoids
QCDC
#37
DBV
Solenoid
#3
ERC
Solenoid
#1
Move
after ESD
#43
Solenoid knobs for QCDC uncoupling + arm maneuvering back to position
in case of DC solenoid power failure (#2, #37, #35, #34, #38)
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24.

Niigata Loading Arms- SVU cabinet left side
arm maneuvering UP/DOWN/LEFT/RIGHT/BACK/FORWARD
# 31/32/3334/35/36
Arm select #2
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25. Conceptual schematics Hydraulic System

HPU
High
pressure Oil
Acc.(*4)
MSVU
Oil return
SVU (*4)
Double acting
Hydraulic
cylinders
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26.

Why do we need Emergency Release System ?
LNG jetties must be protected by Emergency Shut Down systems
during LNG transfer due to:
Very High flow rates involved (600 kg/s or 10 000 m3/h)
Large Flammable Vapor cloud in case of spillage
Vaporization rate is accelerated with sea water
Adverse weather conditions
The ERS is located in the vertical part of the terminal swivel 80. It
allows in case of emergency rapid closure of 2 isolation ball valves
in series, followed by quick uncoupling of the 2 valves via a
hydraulic Emergency Release Coupler (ERC)
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27. ERS principle

Double ball valves DBV (principle)
Emergency Release Coupler (principle)
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28. ‘Chiksan -Niigata’ ERS

•The DBV and ERC are operated by independent cylinders.
•The linkage of the DBV and ERC is hydraulically interlocked to prevent
uncoupling before DBV closed (Solenoids 1 and 3)
•Designed for MAXIMUM surge pressure (30bg ) at MAX flow and 8 s MAX
closing time
•A key lock on hydraulics prevents accidental opening during maneuvering
and is interlocked with ‘2 position switch’
•The ERC clamps have a support hanger device to prevent them from falling
on ship deck after emergency disconnection
•Pins are provided for protection against closing/uncoupling during testing
•Some degree of Fire proofing
•Quick snap hydraulic hoses (QCDC hydraulics downstream)
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29. ‘Chiksan -Niigata’ ERS

ERC cylinder
Ball valve u/s
DBV lock pin
Cross
Linkage
ERC
clamp
Ball valve d/s
DBV lock pin
hydraulic actuators
•1 for valve isolation
•1 for coupler
•They are hydraulically interlocked
Key lock
swivel
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30. ‘Chiksan -Niigata’ ERS

DBV shear pin
ERC clamp
Support hanger
DBV/ERC
interlock valve
DBV cylinder
ERC pin
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31. ‘Chiksan -Niigata’ ERS

O
O
C
DBV normally OPEN
C
ERS
DBV Closed
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32. ‘Chiksan -Niigata’ ERS

Quick Snap hyd hose upon disconnection
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33.

Emergency uncoupling: what happens ?
When ESD2 occurs, loading arm (LNG full) raises by gravity and move
towards the shore, free of the superstructure of the ship and back to a
position behind the jetty fender line
Hydraulics locks outboard arm and slewing
Whole movement achieved by counterweight, then by accumulators
Altamira LNG Terminal ESD2 (spurious)
(N: drive)
Click here for video of ERS test
(Live link)
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34. Emergency uncoupling: what happens ?

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35.

After Emergency uncoupling: what happens ?
1.
After emergency release, outboard arm will be positioned sloping towards
the apex swivel of the arm.
2.
Retract In-board arm is from SVU
3.
Move arm back to store position
4.
Drain Outboard liquid LNG Arm with drain flexible pipe
5.
Drain Inboard liquid LNG Arm is by usual shore N2 hard pipe
6.
Allow N2 purging and DBV warming
7.
Maneuver Arm and reconnect to the ship DBV
8.
Reassemble ERC and fit new shear pins
9.
Reconnect separated hoses of QCDC
10. RESET ESD2 from JC DBV will open
11. Reassemble QCDC flange cap
12. Maneuver arm to store position
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36.

After Emergency uncoupling: what happens ?
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37.

QCDC Quick connect/disconnect Coupling
•QCDC is generally NOT recommended in DEP; ERS+bolted flange safer
•Gain of time masked by pre-loading check meeting and paperwork at the end
•Does saves manpower in harsh conditions
•Can save gaskets (1 x16” spiral wound)
_____________________________________________________
•16 clamps operated by hydraulic cylinders rotate to open/close in 10 s
•The QC/DC clamps are mechanically self-locked after complete closure by
"over-center lock mechanism" by use of spring force integrated in the struts
•Provided with interlock key to avoid accidental opening during Loading
•Flange cover only designed for 2 bg only; provided with a bleed valve
•Designed to open with 40 mm ice cover
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38.

QCDC Quick connect/disconnect Coupling
•In case of loss of power QCDC can be opened by a hand pump
•The quick connectors (suction/discharge) are to be connected to the swivel 80
Hand pump in warehouse
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39.

QCDC Quick connect/disconnect Coupling
Click here for videos of QCDC open/close
Live Link
(SEIC)
N: drive
(Niigata)
Key
lock
flange
Bleeder
When
closed
QCDC overview
Check Flange face
seal: must be in
good condition
QCDC open
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40.

Niigata Loading Arms- Storm lock/and anti-rotation
The arm is secured to its rest position with mechanical devices
GBZ
Storm lock
(inboard arm)
Anti-rotation lock pin
(outboard arm)
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41.

Jacking legs
Jacking legs is installed at the terminal style 80 and partially
transfer arm load to the ship deck reduces ship manifold stress
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42.

Dummy Manifold
A dummy manifold can be needed for the following maintenance
reasons:
•ERS testing
• Resting of the arm for maintenance purpose
Dummy manifold should be strapped
down to 2 lugs with 2 chain blocks
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43.

Niigata Loading Arms- 2 position key switch
-Freewheel =position 1 = ‘ connected’
1.
2.
Enable Opening of loading arm MOV
prevents DBV test
- Parking/Maneuvering = position 2 = ‘drive’
1.
2.
Forces arm MOV closed
Enable arm maneuvering
Freewheel # 1
Smithlock
key
Park/maneuv # 2
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44.

Jetty Console
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45.

Jetty Console
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46.

Jetty Console
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47.

Jetty Console
Manual ESD2
deactivated
Manual ESD2
deactivated
See slides ESD2:
Inhibited when MOV closed
Stored position
MOV081
MOV061
Pendant
closed
closed
selected
Common
Z3404/3
Z3402
Z3401
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48.

Niigata Loading Arm- maneuvering control
Each arm can be maneuvered at 2 different speeds via:
• jetty console
• pendant control box
• radio control box (joy stick); not available due to frequency issue with RF
During maneuvering arm movement is stopped at pre-alarm limit !
Backward
Forward
Up
Down
Left, Right
ship
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49.

Niigata Loading Arms- maneuvering control
Neutral (N) when arm is in
freewheeling
Jetty console
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50.

Niigata Loading Arms- maneuvering control
Radio
Transmitter
Pendant box
cable reel
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51.

Niigata Loading Arms- maneuvering control
Radio Control Transmitter
Currently not available; Frequency 429 MHz to be
changed
Arm Select
In. Arm
Out. Arm
Slew
QCDC
speed
Movement selection
Pendant Control box
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52. Niigata Loading Arms- maneuvering flow chart

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53.

Loading MOVs
A Loading MOV (electrical) is provided for each arm as primary isolation at
the loading manifold on jetty head
They are CLOSED proximity switches
The position of these valves is incorporated in the safeguarding LOGICS
MOV logics slide
Loading MOVs 062 /81 /61 /91
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54.

LOADING MOVs detail
Loading MOVs 062 /81 /61 /91
GBZ
69C/81C/61C/91C
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55.

3 Emergency Systems logics
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56.

3.1 ESD1
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57.

ESD1
ESD1=loading is stopped and jetty head isolated, intermittent horn
from MCR, jetty console, jetty approach, ship (s/s link)
LL pressure hyd Oil common loading arm maneuvering system
LL pressure hyd circuit of ERS of individual loading arms
Fire Alarm
Any Fuse blown in ERS logic system (solenoids 1,3,5)= PLC failure
Pre-Alarm Apex/Slewing excess angles ie if MOV not closed
(2.5 m before design limit of mechanical reach) or faulty
ship/shore link unhealthy (loss of signal or ship emergency)
LNG Tank High pressure
Manual
Initiation
Automatic
Initiation
•Immediate stopping of the loading pumps (to reduce surge)
ESD1
•Fast closure < 15s of both ESD1 valves
•Ship manifold closes > 15 s but < 30s through s/s link
•Starts hydraulic pumps
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58. ESD1 inhibit

During maneuvering arm movement is stopped at pre-alarm limit !
But ESD1 disabled if MOV closed
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59.

ESD1 valves
•2 hydraulic valves in series to avoid
failure on demand; 1 m apart
•Safe distance from jetty head: 70 m
•Avoid excessive surge generated by
rapid valve closure > 10s, < 15s Max
closure time
•FAIL CLOSE
UZ803/4 (1 loading line)
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60.

ESD1 manual Switches (HZs)
ESD1
ESD1
Jetty trestle HZ043 70 m from jetty head
Jetty Console HZ671
HZ042
MCR HZ072
From ship thru ship/shore FO link
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61.

ESD1 activation
Override
FO Link
unhealthy
ESD1 lamp
Holding mode
Intermittent Horn
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62.

ESD2 Emergency Release System (ERS)
ESD2 uncouples arms quickly with minimum spillage when ship or
Loading arms at risk
ESD2 = ESD1 + ERS activation+continuous horn on jetty
from MCR, jetty cubicle, jetty approach (same as ESD1)
ship (s/s link) can NOT be used for ESD2
Manual Initiation
all arms
Over-extension from loading arm angle ie Apex/Slewing angle
(2.0 m before design limit of mechanical reach)
Automatic
Initiation on
each loading arm
ERS
1.
2.
3.
Response time elec/hyd signals =1s
Double Valve Closure= 5 s
Then, Arm uncoupling < 2 s
TOTAL< 8 s
This allows safe uncoupling for ship adrift at 25 cm/s speed
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63.

ESD1
ESD1=loading is stopped and jetty head isolated, intermittent horn
from MCR, jetty console, jetty approach, ship (s/s link)
LL pressure hyd Oil common loading arm maneuvering system
LL pressure hyd circuit of ERS of individual loading arms
Fire Alarm
Any Fuse blown in ERS logic system (solenoids 1,3,5)= PLC failure
Pre-Alarm Apex/Slewing excess angles ie if MOV not closed
(2.5 m before design limit of mechanical reach) or faulty
ship/shore link unhealthy (loss of signal or ship emergency)
LNG Tank High pressure
Manual
Initiation
Automatic
Initiation
•Immediate stopping of the loading pumps (to reduce surge)
ESD1
•Fast closure < 15s of both ESD1 valves
•Ship manifold closes > 15 s but < 30s through s/s link
•Starts hydraulic pumps
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64.

3.2 ESD2
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65.

ESD2: avoid spurious trips !
Weight of end section of the arm + ERS+QCDC # 3 tons
Prevent accidental uncoupling or loss to sea when arm is parked or
maneuvered
1.
Manual ESD2 switch provided with protection cover
2.
Key operated valve in hydraulic supply to release ERS interlocked with arm control:
when ERS disabled key is trapped in closed valve and control unit locked in mode #2
park/Maneuv. On connection to the ship the valve is opened, allowing the key to be
removed and inserted and trapped into the control unit, enabling the arm to be
switched to mode#1 freewheeling
3.
Mechanical parking/storm lock on each arm with a proximity switch:
Inhibits automatic ESD2 and indicates when arm properly secured
Hydraulic valve to prevent power to ERS when parking lock secured
4.
Automatic ESD2 per arm: 2 out of 3 voting logics for GBZ over-extension
5.
Automatic ESD2 per arm: inhibited if Test Override Switch ON
6.
Manual ESD2 uncouples arms whose loading MOVs NOT closed and NOT stormlocked
7.
ESD2 Can not be reset from MCR, only from Jetty console (Visual contact)
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66.

ESD2: avoid spurious trips !
ESD2
Jetty trestle HZ045
Jetty console HZ672
Cover !
ESD2
MCR HZ047
From ship thru ship/shore FO link
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67. ERS interlock system

•Key # 2 Valve closed when arm
being Maneuvered)
•Key must be in valve to operate
QCDC
SINGLE
Key # 1 trapped valve locked
closed during maneuv/park
(pos 2 on JC) prevents ERS
•can open ERC valve
DOUBLE
Key # 2 trapped valve
opened during connection to
ship (pos 1 on JC)
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68.

ESD2: avoid spurious trips !
Manual ESD2 inhibit
when stormlock secured
Mechanical parking/storm lock
With proximity switch
Stormlock/ Maneuvering/
freewheeling lamps
Hydraulic valve
supply line to DBV/ERS
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69.

Power failure
in case of AC power failure:
•Hydraulic system for each ERS has backup N2 hydraulics
• ESD2 is still possible by over-extension or manually
•Arm disconnection/storing still possible with 2 hand pumps
in case of DC power failure(solenoids are on 110 V DC):
•Solenoids1 5,3,1 maintain ERS valves and coupling in ‘Normal’ position
•Solenoid 5 has a manual lever for ERS activation in case all solenoids are
de-energized
Z4
1 Solenoid 3 is for DBV closure
Solenoid 1 is for ERC opening
Z3
Z2
Z1
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70.

3.3 OTHER LOGICAL FUNCTIONS
•OOS
•TOS
•QCDC
•LOADING MOVS
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71.

Other logical functions-OOS
Operational Override Switch needed in LNG to allow circulation of
cold product to avoid thermal cycling when jetty not occupied
OOS overrides:
1.
PZLL oil in hydraulic oil in control system PZ651LL
2.
PZLL oil in hydraulic of ERS control system
3.
Absence of healthy ship/shore link (no ship) if All LOADING MOVs
closed (interlock)
Allow opening
Of ESD1 valves
All 3 conditions at end of each loading when ship departed and
hyd oil stopped
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72.

Other logical functions-OOS
HBS044 Lamp
Yellow light
Override=ON
OOS in MCR (HBS044)
White light=Override ON
Jetty Console
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73.

Other logical functions-TOS
The Test Override Switch is needed for:
Testing the ERS a loading arm on the dummy manifold
Moving Loading Arm to dummy manifold in case it is located beyond the
extension pre-alarm and trip limits
Function of TOS is to override:
restriction of the maneuvering of the arm beyond pre-alarm
Initiation of ESD2 when arm is maneuvered beyond trip alarm or when
metal plate inserted to test GBZ
Interlocks:
Loading MOVs can not be open if TOS in ‘override’ position
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74.

TOS
ISSOW permit needed before TOS used
TOS is a key locked Switch installed in Jetty console
key can only be inserted/removed in position ‘0’ (Neutral)
2 yellow flashing lights when activated
Indication in MCR
TOS
jetty console (JC)
2 Flashing lights (JC)
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75.

ERS- Test key
Test ERS key switch is used to override TOS and and initiate
uncoupling when arm on dummy manifold:
When key on ‘Test’ position, it de-energises:
•Hydraulic Solenoid 3 DBV closes
•Hydraulic solenoid 1 ERC opens
Brakets
Actuator pin
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76. QCDC Interlock

Interlocks to reduce risk of human error during Maneuvering
(dropping flange cap) or loading (LNG leak)
• The QC/DC clamps are mechanically self-locked after complete
closure by "over-center lock mechanism" by use of spring force
integrated in the struts
• Closed QCDC key lock valve isolates hydraulics during loading
• Hyd pump Motors do not run during loading except for recharging Accs.
During the re-charging, hydraulic pressure for the clamp actuator is
blocked by QCD solenoid valve #38
• Opening of QCDC only possible if MOV of arm closed
= QCDC clamp opening not to possible during Loading
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77.

Loading MOVs- summary
The position of loading MOVs is incorporated in the safeguarding LOGICS:
• Loading MOVs are IPS interlocked with shore MOV003/6 (rundown/loading)
•Loading valves MOVs are key interlocked with their strainer for draining
•Liquid LNG MOVs can only be opened if Vapor 081 MOV NOT closed
_________________________________________________________________
•Opening of each MOV is only possible if arm in ‘Free-wheeling’ position
(mode 1), i.e. when arm connected to ship When arm is put on ‘ parking/
Maneuvering’ position (mode 2), the loading MOV will be forced closed
•ESD1 from Apex/Slew angle pre-alarms only activated if MOV NOT closed
•Manual activation of ESD2 only possible if > 1 Loading MOV NOT closed
•OOS can be put on ‘override’ mode only when all Loading MOVs are closed
•When TOS is in ‘override’ mode, loading MOVs can not be opened
•QCDC can only be open if MOV closed
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78.

4 ERS testing
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79.

ESD Testing
Test of proximity sensors using TOS
ESD1: before each loading; various initiators can be tested
ERS (ESD2): >1 /year, < 2/year together with ALEM; needs PTW
ISSOW, using dummy manifold
There are 3 types of ERS tests:
1.
2.
3.
DBV testing with loading arm connected to ship
Stroke test and functional test of ERC without disconnection
Actual disconnection with loading arm connected to ship or to dummy manifold
Risks of human error
Follow procedures !
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80.

Proximity sensor Testing
Move arm until it reaches pre-alarm and check pre-alarm
The arm can not be moved further w/o override
Set Test Override Switch (TOS) ON
Move arm to trip settings and check Trip signals (slew L, R,
apex angles)
Move back arm to working envelop
Remove TOS override
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81.

ERS test #1: DBV testing
1.
2.
3.
4.
5.
6.
7.
With arm connected (set N)
Remove 2 DBV shear pins
Loosen DBV lock pins
Set arm at POS2 load/maneuvering
Press ‘DBV CLOSE TEST’ on JC > 5 seconds
Switch off switch and confirm DBV Opens again
Put back DBV lock pins and insert 2 new shear pins
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82.

ERS test #1: DBV testing
DBV test override is arm NOT in
POS2
Test DBV push button + lamp
In Jetty console
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83.

ERS test #2: ERC stroking and function testing
1.
2.
3.
4.
Open ERC Key interlock valve
Secure arm in STORED position or set to POSITION 2
Initiate ESD2; should NOT actuate
Pull; ERS manual handle on Solenoid # 5 should not actuate
________________________________________________________________
1.
2.
3.
4.
5.
Set arm to pos 1 or realase inboard tie down pin
Move arm
Close block valve on SVU to avoid full retraction
Close the tie-down block valve at base riser
Initiate ESD2 DBV will close, then ERC cylinder extends but without ERC opening
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84.

ERS test # 3: ERS annual testing
1.
2.
3.
4.
5.
6.
7.
8.
Weather and sea should be calm
With arm connected (set N) to ship or dummy manifold
Set arm at POS1 freewheeling
Attach the 3 wire ropes and chain blocks to the top of the swivel 80
Block valves in SVU should be closed to avoid arm full retraction
Perform ESD2 test
Reopen block valves in SVU to reset arm full retraction
Reconnect ERC
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85.

5 overview drawings
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86.

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87.

S&L Valve Overview
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