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NOV Equipment overhaul by Alatas Marine Engineering Singapore
 

Our client engaged ALATAS to carry out a 5 yearly Special Periodic Survey (SPS) on 3 BMC Offshore cranes (Baker Marine Cranes), which was carried out by ALATAS afloat repair team, led by Sr. Offshore Crane Engineers.

As additional scope of work, Alatas specialized  Workshop, was entrusted with the overhaul of mostly NOV equipment  (National Oilwell Varco) These components were offloaded from the rig at dry-dock to our workshop for thorough inspection, overhaul & testing. Upon completion of repairs, the offshore equipment was sent back on-board and installed, function tested and re-commissioned by our NOV Engineers.

List of Components received:

  • JD Neuhaus 50ton Monorail Air Hoist
(x4 units)
  • NOV Utility Winches
(x2 units)
  • NOV Racking Winches 
(x2 units)
  • NOV Man Riding Winches 
(x2 units)
  • NOV Grip Head 
(x1 unit)
  • NOV Singles Pick-Up Elevator system 
(x1 unit) 
  • NOV Rotary Table 
(x1 unit)
  • 12ton BMC Crane Ball Hooks 
(x3 units)
  • 30ton BMC 900 & BMC 1600 Crane Aux. Hook Block
(x1 unit)
  • 55ton BMC 2250 Crane Main Hook Block 
(x2 units)

1. JD Neuhaus 50 ton Monorail Air Hoist (x4 units)

Job Scope:

The monorail air hoist consisted of components such as motors, gearboxes, 80m of chains, chain buckets, rollers and hangers for hoses. All units were dismantled from the main structure, cleaned to proper and inspected thoroughly. All gears and pins were NDT tested and no defects found. All parts such as bearings, seals, screws, fittings, filters were replaced to new. The complete dismantled structure was sandblasted and painted with 3 layer of marine grade paint. For the 80M chain, all existing grease were removed, sandblasted, NDT tested & re-lubricated with a special non drip sticky chain grease to protect the environment. Upon completion of overhaul on all individual components, the complete structure was re-assembled and pressure tested accordingly in ALATAS Workshop, Singapore. Results were found satisfactory and delivered unit on-board rig.

NOV Equipment Overhaul
NOV Equipment Overhaul

50 ton Monorail Air Hoist upon arrival

50 ton Monorail Air Hoists upon arrival

NOV Equipment Overhaul
NOV Equipment Overhaul

50 ton Monorail Air Hoist Overhauled

50 ton Monorail Air Hoist Chain Baskets repaired

 

2. NOV Utility Winch / Racking Winch / Tugger Winch overhaul

Job Scope:

The Utility & Racking winch consists of components such as motor, gearbox and drum and the winch body. All units were dismantled from the main structure, cleaned to proper and inspected thoroughly. All gears and pins were NDT tested and no defects found. All parts such as bearings, seals, screws, filters, brake discs, pneumatic hoses & fittings and wire ropes were replaced. The complete dismantled winch frame was sandblasted and painted with 3 layer of marine grade paint.

Upon completion of overhaul on all individual components of the Utility winches, the complete structure was re-assembled and pressure tested accordingly in ALATAS Workshop. Results were found satisfactory and the tugger winches were delivered back on board the rig.

 

NOV Equipment Overhaul
NOV Equipment Overhaul

Utility Winch upon arrival   

Utility Winch Overhauled

NOV Equipment Overhaul
NOV Equipment Overhaul

Racking Winch upon arrival

Racking Winches Overhauled

 

3. NOV Man Riding Winch Overhaul

Job Scope:

The National Oilwell Varco Man riding winch consists of components such as winch motor, hook stop, drum, pressure roller, hydraulic & mechanical brake calipers with brake discs, wire guide, emergency stop valve and controls. All components  were dismantled, cleaned to proper and inspected thoroughly. All gears and pins were NDT tested and no defects found. All parts such as bearings, seals, screws, fittings, filters, hoses & fittings were replaced to new. The complete dismantled structure was sandblasted and painted with 3 layer of marine grade paint.

Upon completion of overhaul, the complete structure was re-assembled and  tha man riding winches were dynamically load tested the unit for 150KG SWL test manually & with remote control, as per NOV winch test procedure. Followed by 225 kg dynamic brake test and 300 kg static brake test, holding for 10 minutes in ALATAS Workshop. Results were found satisfactory and a test certificate was issued and man riding winch was supplied back on board the rig.

 

NOV Equipment Overhaul
NOV Equipment Overhaul

NOV Man Riding Winch upon arrival

NOV Man Riding Winch Overhauled

NOV Equipment Overhaul
NOV Equipment Overhaul

NOV Man Riding Winch Load Test 300KG    

NOV Man Riding Winch ready for delivery

 

4. NOV Grip Head HydraRacker x-y

Job Scope:

The National Oilwell Norway AS Grip head 3 1/2" - 9 3/4", drawing Nr. D1197-A0004 consists of components such as cylinders, actuators, valves & controls. All units were dismantled from the main structure, cleaned to proper and inspected thoroughly. Parts such as seals and fittings were replaced to new.

Upon completion of overhaul on all individual components, the complete structure was re-assembled and pressure tested the unit up to 315 Bar in ALATAS Workshop. Results were found satisfactory and delivered unit on-board rig.


NOV Equipment Overhaul
NOV Equipment Overhaul
Gripper Head Sketch
Grip Head upon arrival
NOV Equipment Overhaul
NOV Equipment Overhaul
Grip Head Overhaul in progress
Grip Head Pressure Test / Grip Head ready for delivery  

 

5. VARCO Bj Singles Pick-Up Elevator system

Job Scope:

The NOV Singles Pick-Up Elevator system, (Varco BX 4-50, 4-50, 4-75 & 5 hydraulic operated elevator) consists of components such as 6 cylinders, 5 valve blocks and controls.
All units were dismantled from the main structure, cleaned to proper and inspected thoroughly. All necessary parts were NDT tested and no defects found. All parts such as bearings, seals, split bushes for cylinders, screws, fittings, hoses & fittings, wire ropes with thimble were replaced to new. One of the cylinder’s pistons was seized and had to be newly fabricated on top urgent basis. Thereafter, the complete dismantled structure was sandblasted and painted with 3 layer of marine grade paint.

Upon completion of overhaul on all individual components, the complete structure was re-assembled; function & pressure tested the unit at 210 Bar in ALATAS Workshop. Results were found satisfactory and delivered unit on-board rig.

 

NOV Equipment Overhaul
NOV Equipment Overhaul

Single Pick Up Elevator upon arrival

Utility Winch Overhauled

NOV Equipment Overhau
NOV Equipment Overhau

Racking Winch upon arrival

Racking Winches Overhauled

   

6. NOV Independent Rotary Drive D-495

Job Scope:

The Offshore rotary table, National Oilwell Varco D-495 (PetroJack Rotary Drive, NOV Drawing PL X132-3457) was overhauled by Alatas Engineering Workshop, it was completely dismantled into its components and following items were fully overhauled, dynamically tested and issued with test protocol and repair certificate before deliver

- Hagglunds Compact Motor CA70
- Hagglunds Compact Lamella Brake BICA 24
- Hyd. Controls Valve Package, NOV drawing PL 1313657
- Moog Valves, Series D661K, D662K, D663K, D664K and D665K
- NOV Pressure Accumulators

 

NOV Equipment Overhaul
NOV Equipment Overhaul

D-495 Independent Rotary Drive with Hydraulic Motor & Disc Brake


Control Valve assy before overhaul

NOV Equipment Overhaul
NOV Equipment Overhaul

Moog Valve before overhaul

Valve parts dismantled      

   
NOV Equipment Overhaul
NOV Equipment Overhaul

Valve spool to be overhauled

Valve Parts overhauled & ready

NOV Equipment Overhaul
NOV Equipment Overhaul

Control valve testing complete with sensors

Control valve & CA70 motor testing set-up

NOV Equipment Overhaul
NOV Equipment Overhaul

Control Valve function test set-up

Moog Valve overhauled

NOV Equipment Overhaul

Hagglunds radial piston motor CA70, overhauled

 

   

7. Hook Blocks (12ton,30Ton & 55Ton)

Job Scope:

The Hook blocks, 12ton (x3 units), 30ton (x1 unit) & 55ton (x2 units) were offloaded to our Workshop for complete inspection, overhaul them adhering to DROPS compliant and load testing them, witnessed by ABS Surveyor.

All Hook blocks were completely dismantled cleaned to proper and NDT inspected before repair works. No defects were found through the NDT test. Hence, all necessary parts such as bolts (xylan quoted), bearings, seals and etc were replaced new. The complete dismantled structure was sandblasted and painted with 3 layer of marine grade paint. During re-assembly, all Tie Rods were fitted with Nylon Lock Nuts and all other bolts etc. secured with locking wire. SWL was Stenciled and hard stamped into the block body along with the Testing info and unique ID number.

Upon reassembly of the complete Hook blocks, they were load tested according to previous certificates issued by Owner as follows in the presence of ABS surveyor:

-SWL 12ton Hook block = 24ton Proof Load
-SWL 30ton Hook block = 55ton Proof Load
-SWL 55ton Hook block = 83.18ton Proof Load

Upon load test, we immediately engage NDT test to be carried out on the Hook area to check for defects and when no defects was found, all Hooks were delivered on-board rig.

 

 

NOV Equipment Overhaul
NOV Equipment Overhaul

30 ton Hook Block upon arrival   

12 ton Ball Hook Upon arrival   

NOV Equipment Overhaul

55 ton Hook Block upon arrival   

 

NOV Equipment Overhaul
NOV Equipment Overhaul

To carryout load test on SWL12 ton Ball Hook 

To carryout load test on SWL30 ton Hook Block

NOV Equipment Overhaul
NOV Equipment Overhaul

SWL30 ton Hook was stenciled as SWL 22ton as per Owner request & SWL 12ton Ball Hook Ready for delivery

SWL55ton Hook was stenciled as SWL 40 ton as per Owner request & SWL 12ton Ball Hook Ready for delivery

   
 
 
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