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Identify various types of ships that are used to supply fuel and cargo Identify various types of equipment used during UNREP Describe procedures for conducting a safe UNREP Name various types of replenishment rigs used during fueling and cargo transfer

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Identify various types of ships that are used to supply fuel and cargo

Identify various types of equipment used during UNREP

Describe procedures for conducting a safe UNREP

Name various types of replenishment rigs used during fueling and cargo transfer

Recognize the different types of standard tensioned replenishment alongside method (STREAM) rigs used

Identify procedures for conducting a safe VERTREP

Describe the type of equipment used in VERTREP


From NROTC, 12-22-2007

  • The primary aim of an UNREP is the safe delivery of the maximum amount of cargo and fuel in the minimum amount of time
  • The operation must be conducted without interfering with the mission of the force
  • Using UNREP procedures, a force can remain at sea and on station indefinitely
types of underway replenishment
Types of Underway Replenishment
  • Connected Replenishment (CONREP)

a method of transferring fuel, ammunition, and stores from one ship to another through lines and hoses connecting the two ships.

types of underway replenishment5
Types of Underway Replenishment
  • Vertical Replenishment (VERTREP)

a method of transferring ammunition and stores from one ship to another by helicopter

replenishment ships
Replenishment Ships

Single purpose vs. Multi-purpose

navy vs military sealift command replenishment ships
Navy vs. Military Sealift Command Replenishment Ships
  • MSC Ships
    • Former naval auxiliaries now manned with civilian or civilian/military crews
    • Identified with a “T” in front of their type classification and are USNS vice USS
oilers ao
Oilers (AO)
  • Cimarron Class (AO-177)
  • Henry J Kaiser Class (TAO-187)
  • Services
    • Complete range of petroleum products
    • Limited Cargo, Food, Stores
    • Mail
henry j kaiser class t ao 187
HENRY J. KAISER Class (T-AO 187)
  • 13 underway replenishment oilers operated by Military Sealift Command
  • provide underway replenishment of fuel to U.S. Navy ships at sea and jet fuel for aircraft assigned to ships
    • UNREP stations on both sides of ship
  • 2 diesels, 2 shafts, 20 kts
  • ship’s company = 82 civ/1 O/20 E
  • Helo platform only
combat stores ships afs
Combat Stores Ships (AFS)
  • Mars Class (TAFS-1)
  • Sirius Class (TAFS-8)
  • Services
    • Food (Refrigerated and Frozen)
    • Stores, Cargo
    • Mail
fast combat support ships aoe
Fast Combat Support Ships (AOE)

*Largest, fastest, and most powerful auxiliary ship

*Deploy with CVBGs

  • Sacramento Class (AOE-1)
  • Supply Class (AOE-6)
  • Services
    • Fuel
    • Ammunition
    • Food, Stores, Cargo, Mail
    • 2 CH-46s for VERTREP capability
sacramento class aoe 1
  • High-speed oiler, ammunition and supply ship
    • 4 total (AOE 1-4)
  • U.S. Navy’s largest combat logistics ship
    • speed and armament to keep up with CVBG
      • carries 177,000 barels of oil, 2,150 tons of ammunition, 500 tons of dry stores, and 250 tons of refrigerated stores
    • reduces vulnerability of serviced ships by reducing alongside time
  • 4 gas turbines, 2 shafts, 26 kts
  • ship’s company = 24 O/576 E
  • 2 CH-46 helicopters
  • NATO sea sparrow, two CIWS,
supply class aoe 6
SUPPLY Class (AOE-6)
  • 4 total ships (AOE 6-10)
  • 4 gas turbines, 2 shafts, 25 kts
  • ship’s company = 40 O/627 E
  • 3 CH-46 helicopters
  • NATO sea sparrow, two CIWS, two 25mm
ammunition ships ae
Ammunition Ships (AE)
  • Kilauea Class (TAE-26)
  • Services
    • Ammunition, bombs, missiles
    • Limited dry cargo
    • Helicopters for VERTREP ops
other unrep ships
Other UNREP Ships
  • Aircraft Carriers
    • top off escort ships
  • Amphibious Assault Ships
    • Tarawa Class (LHA-1)
    • Wasp Class (LHD-1)
replenishment planning 1 week 4 days prior
Replenishment Planning1 week - 4 days prior

submit logistics request (RASREQ)

  • requested UNREP date
  • rendezvous point
  • fuel requisition
  • stores requisition
replenishment planning 1 week 4 days prior18
Replenishment Planning1 week - 4 days prior

RASREQ reply

  • name of delivery ship
  • rendezvous location and time (considerations?)
  • breakdown of supplies to be transferred
  • expected replenishment course / speed
day prior to replenishment
Day Prior to Replenishment
  • Conduct UNREP brief
    • ship/station sequence
    • cargo sequence / flow
    • masthead height of UNREP ship
    • replenishment course / speed
    • factors that could affect UNREP - sea state, wind direction, operational considerations
    • emergency procedures
    • safety briefing
day of replenishment
Day of Replenishment
  • Rendezvous with UNREP ship
  • Set UNREP detail
  • Safety brief onstation
  • Take station on UNREP ship (as directed)
personnel requirements at unrep stations
Personnel Requirements at UNREP stations
  • 1 Safety Officer (white helmet)
  • 1 Rig Captain (yellow helmet)
  • 1 Signalman (green helmet)
  • 2 Phone talkers (green helmets)
  • 1 Gunners Mate (red helmet and vest)
  • 15 line handlers (blue helmets)
  • 4 riggers (blue helmets,goggles, face shields)
  • 1 Corpsman (white helmet w/red cross)
ready aim duck
Ready, aim, DUCK!

MK87 Mod1 Line Throwing Rifle - propels a buoyant rubber projectile attached to a spool of international orange shotline

safety officer
Safety Officer
  • Qualify PQS Safety Officer, Underway Replenishment
  • Primary responsibility = prevent unsafe activities on station
  • conduct safety brief to all personnel
  • ensure all personnel are in Kapoks/MK5s and proper battle dress with all watches and jewelry removed
  • Be familiar for procedures with receiving rig
general safety
General Safety
  • Life buoy watches stationed
  • Chemlights worn by all personnel at night
  • line handlers use “hand-over-hand” method
  • smoking lamp is OUT throughout the ship while transferring fuel/ammo
unrep principles and procedures
UNREP Principles and Procedures
  • Receiving Ship
    • Normally the approach ship
    • Maintains station on the delivery ship
    • receives fuel, ammunition, or stores from the supply ship
replenishment stations


Replenishment Station

090° or 270°R

alongside UNREP ship

Waiting Station

500 yds astern

Lifeguard Station

180°R 1,000yds

Replenishment Stations
waiting station


Waiting Station

Waiting Station


300-500 yds astern

while in waiting station
While In Waiting Station
  • Examine the wake of UNREP ship
    • Your wake should be parallel / keep about 50yd separation between wakes
  • Adjust speed to match UNREP ship
  • Determine lateral separation using Radian Rule
lateral separation requirements while alongside
Lateral Separation Requirements while Alongside
  • 100-120 ft (35-40yds) for most combatants
  • 150ft (50yds) for carriers / less maneuverable ships / inclement weather
unrep approach for standard 120 lateral separation


UNREP Approach for standard 120 lateral separation

Waiting Station


500 yds astern

*Bearing offset from base course to tangent of side of replenishment ship at a given distance

120 degress lateral separation table
120 Degress Lateral Separation Table

Range to UNREP ship (yards)Degrees difference

600 4

500 5

400 6

300 8

200 12

*If you are 600 yards away on unrep course of 150 degrees true, delivery ship bears 146 degrees true from you.

radian rule



D =  ( )



50 =  ( )

Radian Rule

D 50 yds

500 yds R

 = 6 degrees to

port or 354°R

unrep principles and procedures33
UNREP Principles and Procedures

Romeo Corpen / Speed:

  • Naval terminology for replenishment
  • course and speed
  • *speed normally 13-15 knots
  • -never < 8 knots = reduce rudder effect
  • -never > 15 knots = Venturi effect
  • Considerations for selection include
  • sea conditions, wind direction and
  • velocity

Waiting station

  • 300-500 yards astern
  • Compare gyros/engine rpm
  • Use ROMEO flag signals accordingly


Adjust course and speed to take station 120 feet off to the side of the Control Ship.

120 feet



  • Find a "range" on the other vessel in order to gauge relative position fore/aft.
  • Use Distance line to determine range between vessels.
  • Order small course and speed changes to maintain relative position.


  • Increase speed.
  • Order small course changes away until well clear.
  • Never cross the bow of the Control Ship.




Approach ship takes station in waiting station 300-500 yards astern of control ship and waits for further instruction from control ship




Use of the flag ROMEO

(Control Ship)

ROMEO is placed at the dip on side with the rig.

Meaning: I am steady on ROMEO course & speed and preparing to receive you alongside.

signals while in waiting station
Signals While inWaiting Station

Control Ship

Approach Ship

1. Steady on R Corp/Speed

2. Making preps to receive on starboard side

In waiting station


Use of the flag ROMEO

(Approach Ship)

ROMEO is placed at the dip on side where rig is expected.

Meaning: I am ready to come alongside.

signals while in waiting station43
Signals While inWaiting Station

Control Ship

Approach Ship

Ready to come alongside

as indicated by side of Romeo



Use of the flag ROMEO (Control Ship)

ROMEO is closed up.

Meaning: I am ready to receive you alongside.

in waiting station
In Waiting Station

Control Ship

Approach Ship

Ready for your


In waiting station


Use of the flag ROMEO (Approach Ship)

ROMEO is closed up.

Meaning: I am commencing my approach.

commencing approach
Commencing Approach

Control Ship

Approach Ship

Ready for your



my approach

*Increase speed by 3-10 knots over signaled UNREP speed

coming alongside
Coming Alongside
  • Slow to Romeo speed as necessary
  • Switch to RPM engine orders
  • Line up the rigs
  • Line-throwing guns on Delivery ship send over messengers from each station to opposite stations on receiving ship
    • Exception = danger of a/c on deck, receiving ship fires shotlines at delivery ship
coming alongside49
Coming Alongside
  • Word passed over the 1MC:
    • Shot-delivering ship = “On the (receiving ship’s name), stand by for shot lines. All hands topside take cover.”
      • One whistle signal from each station on delivery ship
    • Shot-receiving ship = “On the (ship’s name), stand by for shot lines at (stations concerned). All hands topside take cover.
      • Two whistle signals from each station on receiving ship
      • Three whistle signals - delivery ship firing shot

Use of the flag ROMEO

(Control Ship & Approach ship)

ROMEO is hauled down when the first messenger line is across.

while alongside
While Alongside
  • Maintain relative position
    • 1-2 rpm speed changes
    • ½° course changes
  • Maintain lateral separation using phone-distance line
  • Be aware of spanwire tension/detension
phone distance line
Phone/Distance Line

- Assists the conning officer in monitoring the

distance between ships.

-350ft long with rectangular colored cloth

markings (flags) for 300 feet in the following


Green = 0’

Red = 20’

Yellow = 40’

Blue = 60’

White = 80’

Green = 100’

phone distance line53
Phone/Distance Line
  • Distance Line Provided by Receiving ship
    • Hooked up on Delivery ship at the 0' end
    • Tended by Receiving ship
  • An intertwined sound-powered phone line
  • allows communication between ships.
phone and distance line









Phone and Distance Line













Double Blue Chemlights at

60, 100, 140, 180 yds