Pipe-laying vessel (PLV) or pipe-lay vessel is a marine vessel that is used for submerged laying of pipe. In most of the cases (depending on the vessel design) the same vessel can be used for other subsea tasks, such as subsea installation, cable / umbilical laying and heavy lift operations if it equipped with a heavy lift crane. Pipe-laying vessels could be Derrick lay barge (aka anchored vessels) or Dynamically positioned (DP) which is required to ensure vessel stability during operations offshore. DP vessels bring more stability but cost significantly more than anchored vessels. A number of other support vessels are generally required during pipe laying operations, such as barges for transporting pipes (with concrete weight coating when required), vessels for touch-down monitoring and diving support vessels if required.
There are various methods for offshore pipeline installation, namely: 1) S-Lay, 2) J-lay, 3) Tow-in and 4) Reel barges. S-lay and J-lay vessels are equipped with a firing line, whereby pipe joints are welded, inspected, coated (if required), as the pipe moves slowly through the working line, with various stations and lowered to the seabed from the back of a vessel.
When using the S-Lay method, a pipe is submerged and curved in ” S” shape from the back of a vessel, till it reaches the seabed, also known as a “touchdown point”. A device called stinger helps to control the curvature of the pipe, to ensure it does not bend or get damaged. Effective tensioning techniques are used to ensure the pipe is not buckled. S-lay method is limited to the water of the depth of around 2,000m.
|Source: Huisman Equipment||Source: heavy lift news|
J-Lay method is very similar to S-Lay, except the fact that the pipe is submerged almost vertically. This technique reduces stress on the pipe; allow working in deeper waters and more hostile subsea environment. J-lay is a slower method compared to other techniques and not suitable for shallow waters.
|Source: Huisman Equipment||Source: Huisman Equipment|
Tow-in method literally involves towing pipes that are afloat. Generally, tugboats are used for this laying method. Further on, it could be a surface tow, mid-depth tow, off-bottom tow and bottom tow.
|Source: Heavy Lift Specialist||Source: Drilling Formulas|
Reel barges and Flexi Lay are vessels that have horizontal or vertical reels to which small diameter pipe, cable, the umbilical and flexible pipe is spooled. A vessel with horizontal reels can only do the S-lay installation, whereas vertical reel barges can do both methods, J-lay and S-lay. To reduce installation costs, pipe or cable is reeled onshore and lifted to an installation vessel either in a port or offshore, using fitted cranes and a transport barge.
|Source: Huisman Equipment||Source: Royal IHC|
In the Middle East, S-Lay is the commonly used pipeline installation method, with Reel barges used for cable / umbilical laying. In some instances, the same S-Lay vessel can be used for installation of cable and umbilical, and largely depends on the nature of a given project.
Risks & Opportunities
- Poor risk allocation will result in large cost escalation of as much as 40%, in particular during the high times in the industry
- Weld repair rate is a KPI to look at, as it tells two things: 1) Track record and how good a contractor is in welding and 2) Like-hood of longer project duration and subsequently late startup, as a result of welds repairs
- Welding of CRA alloy is highly precise and requires guarantees of zero-defects with sustainable production afterwards. Hence, verified details and track records of CRA welding expertise is critical to understand capabilities of the contractor
- Job timing planning is key. When it comes to GCC and India, those two markets are complementing each other in terms of 1) Vessel specifications required and 2) Weather windows when most of the work is done. Projects in India are done mostly during November-May, after which monsoon season starts and lasts till September - October. In contrast, most of the offshore work in GCC happens between May-October, during a workable weather window, with more productive time. November-April periods in the Arabian / Persian Gulf produce around 30%-50% of non-productive-time
- Weather risk. Consider managing the weather risk on case-by-case basis. There may be times when the client will be in a better position to bear this risk, than a contractor.
- DSV vessel. When it comes to laying cable, umbilical or flexible pipes, standard diving support vessel (DSV) or a construction vessel can be used, which is a much more cost-efficient option. A good size DSV would be in the area of $60k-$120k per day, compared to the average of $250k- $350k for a pipe-laying vessel.
Supply & Demand Dynamics
Unlike cable-lay / reel barge vessels which are used in the offshore wind industry as well, the demand for pipe laying vessels is directly affected by offshore project developments in the oil and gas industry. Here are the major drivers globally and regionally for 2018 – 2021, that would shape the demand for pipe laying vessels.
According to Rystad Energy, almost 100 projects worldwide are expected to be sanctioned by the end of 2018, as below:
- Asia - 30
- Europe - 30
- Africa – 20
Demand in GCC
For the next 3-4 years, Qatar and Saudi Arabia will be the major areas where strong demand would originate. It shall be noted that a large portion of this demand for pipe laying services is most likely to come in late 2019 and 2020.
- A significant increase in activities in Qatar in 2019-2021
- North Field LNG expansion which consists of six wellhead platforms, jackets and associated intra-field and main trunk lines to shore (Platts)
- NOC Al Shaheen project expansion
- Barzan project pipe repair
- Other smaller developments and projects
- Maintain Production Programme in Saudi Arabia that assume spending $300B over 10 years. Platforms under construction / to be installed (IHS Markit):
- 2018 - 48
- 2019 - 57
- 2020 - 11
- Expansion offshore UAE, as well as sour gas projects such as The Hail, Gasha and Dalma
- Total E&P projects offshore, Iran
The market for pipe laying and heavy lift vessels is geographically clustered, with a fairly large majority of vessels used only in certain parts of the world due to 1) Water depth and size of projects/facilities, 2) Transit distance and time and 3) Weather windows. Yet, there are vessels that a “global” or cover a wider geography and used for multiple purposes globally. Generally, those vessels tend to be with lower crane capacity (below 3,000 ton).
While most of the companies’ own vessels, a significant proportion of the fleet is on charter terms from other owners, be it a bareboat charter or fully crewed, especially during the high times. Shipbuilders, in particular in China, are well known for this model, whereby a vessel is released on bareboat charter to major contractors.
Another important element of the supply side is welding services. While some companies would have welding capabilities in-house (or have a shareholding in a company), a large number of contractors would outsource welding services on their vessels to specialized welding companies. While the list might be fairly diverse when it comes for standard pipe welding, welding of pipes with corrosion resistance alloys (CRA) is extremely complex and there are a limited number of 3rd party companies who are qualified to do it. Serimax, Magnatech and CRC-Evans are the key 3rd parties suppliers of CRA welding services. McDermott and Saipem have CRA welding capabilities in-house, with TechnipFMC owning a part of Serimax.
Over the years, the market went through various cycles of consolidation, growth and bankruptcies. There is a solid segmentation in the market, between global and regional players, as well as fully integrated and not. Below is the list of global and integrated companies with full expertise in-house (or subcontract some portion of it)
- All Seas
- McDermott International
- Subsea 7
It shall be noted that McDermott, TechnipFMC and Saipem historically have been major players in the MIddle East, each generating more than 50% of their revenues from Middle East & Africa. In contrast, Subsea 7, Sapura, COOEC and All Seas have no or very little presence in the Middle East. However, in 2017 and 2018 Subsea 7, Sapura and COOEC have been very active in the GCC for prequalifying, tendering and winning projects. Their presence in the region, in particular in Qatar and Saudi Arabia, is expected to sustain and strengthen during 2019, 2018 and 2020.
Smaller and niche companies specializing in pipe laying and subsea work and/or a particular geographic area, with some engineering and construction capabilities. NPCC, Dynamic Industries and Larsen & Toubro (L&T) are very active players in the region.
- Telford Offshore
- Hydra Offshore Construction
- Heerema Marine Contractors
- GSP Offshore
- Van Oord
- Larsen & Toubro
- Dynamic Industries
Vessel fleet in GCC. As of Q2 2018, the following vessels are used ( or ready to be used) in the GCC.
|Vessel Name ||Owner/ Operator||Crane(mt)||DP Capabilities||Laying Capabilities||Area of Operations|
|DLV 2000||McDermott||2,000||DP 2||S-Lay||MiddleEast|
|Amazon||McDermott||570||DP 3||Umbilical& Cable Laying||MiddleEast|
|DB 27||McDermott||2,200||None, Derrick Lay Barge||S-Lay||MiddleEast|
|DB 30||McDermott||2,800||None, Derrick Lay Barge||S-Lay||MiddleEast|
|DB 32||McDermott||1,500||None, Derrick Lay Barge||S-Lay||MiddleEast|
|Global 1201||TechnipFMC||1,200||DP 3||S-Lay ||MiddleEast, SEA & India|
|Telford - 34 ||Telford Offshore||800||DP 3||S-Lay ||Global |
|Telford - 25||Telford Offshore||800||DP 3||S-Lay ||Global |
|Sapura 3000||Sapura Energy ||3,000||DP 2 ||S-Lay ||Middle East, SEA & India|
|Sapura 1200||Sapura Energy ||1,200||DP 3||S-Lay ||Middle East, SEA & India|
|Sapura 900||Sapura Energy ||900||None, Derrick Lay Barge||S-Lay ||Middle East, SEA & India|
|DeHe 5000||Saipem||5,000||DP 3||S-Lay ||Middle East, SEA & India|
|SevenChampion||Subsea 7 ||2,200||DP 2 ||S-Lay ||Middle East, SEA & India|
|DLS 4200||NPCC||3,800||DP2 & Derrick Lay||S-Lay ||Middle East & India|
|DLB 1000||NPCC||1,200||None, Derrick Lay Barge||S-Lay ||Middle East|
|DLB 750||NPCC||750||None, Derrick Lay Barge||S-Lay ||Middle East|
Cost & Price Analysis
Day rates for pipe-laying vessels are very opportunistic and not driven by bottom-up cost approach. Driven by many factors, fleet utilization and financing being the key. In addition, many contractors are very flexible (within limits) on day rates and can work on different rates, depending on what the vessel is used for. E.g. if a pipe laying vessel was used to lay a pipeline, with subsequent subsea installation work, a contractor may choose to use the same vessel on lower rates (equivalent to a diving vessel) to do diving work, to keep revenues in-house or cover the costs.
Day rates for pipe-laying vessels range from $150k to $500k per day, depending on a variety of factors, such as project duration, time of the year, the appetite for risk and jobs, fleet amortization and utilization, availability of roll-over projects and relationship with customers. Derrick lay barge (aka anchored vessels) are significantly lower prices when compared to DP vessels.
- Day rates for bareboat charters are around 50% of 2014 prices levels ( IHS)
- EPCI costs for platforms and subsea infrastructure are down by 20-30% ( Rystad Energy)
- Total average direct operating cost of the pipe-laying vessel is between $150k and $300k per day, depending on size, age and equipment setup.
The decision on the contracting approach is largely driven by project objectives, complexities and internal capabilities of an oil company. It can be a simple EPC or a more robust project alliance. Yet, particular features of each project should be well understood, to compare and decide which contracting approach and risk allocation work best. Below is a summary contracting and project features that may drive the prices by up to 50%.
- Effective risk allocation. Consider managing the following risks, using more deliberate thinking process:
- Fuel/diesel price
- Currency exchange rates
- Warranty periods and obligations
- Unrealistic liabilities
- Clear scope and responsibility matrix of who is doing what
- Let contractors do what they are best at and avoid micromanaging
- Deploy the most effective contracting strategy that serves the purpose of a particular project
- Avoid, if possible, stipulating dynamic positioning (DP) requirements as a must. This criterion sends a very clear message to the market that no other options available and derrick lay barge (which are lower cost) cannot be used as an alternative. This, in turn, means that competition is only amongst DP vessels and their respective price range.
Comparision of contracting options:
Here is a typical Pipe Laying vessel operates