... Abstract A mudmat supporting a pipeline end termination (PLET) sits on top of a silty sand deposit that could potentially liquefy during earthquake shaking. A conventional code-based bearing capacity analysis of the mudmat was initially performed that accounted for the effect of excess pore...

.... Unlike conventional jackets, some conductor guides/sleeves are modified like jacket legs, however, conductors are kept axially free to move through the sleeves. The mudmats are modified to include in the overall load-bearing capacity of the structure. The lower deck (41m × 25m) will accommodate all...

... and safety standards. The changes in installation assets impacted the structures designs due to the installation equipment and this had a knock-on impact to the procurement and fabrication activities. One example was that the ILS needed to be redesigned to change the mudmat foundation and use an existing...

...://dx.doi.org/10.1680/jgeot.16.P.137 ]. DNV CN 34 Foundations . DNVGL RP F114 Pipe-soil interaction for submarine pipelines . Feng , X. , Randolph , M.F. , Gouvernec , S. , Wallerand , R. 2014 . Design Approach for Rectangular Mudmats Under Fully Three-Dimensional Loading...

...OTC-30795-MS Understanding Sliding Mudmat Behavior using Eulerian-Lagrangian Simulations M. Kabir Hossain, Bryant Consultants, Inc; Jean M. Audibert, Independent Consultant; John T. Bryant, Bryant Consultants, Inc Copyright 2020, Offshore Technology Conference This paper was prepared...

... focused on evaluating the direct impact loads generated by the flowing sediment mass in contact with the analyzed infrastructure component, such as a pipeline or a mudmat. In this study, the mass gravity flow impact on offshore infrastructure is addressed from a different perspective by investigating...

... is subjected to substantial lateral loads, vertical loads and overturning moments that cannot be effectively resisted by a typical shallow (mudmat) foundation. A new HSF design methodology was established and a pile head locking system was developed by the project team. This is the first offshore application...

... Abstract Rectangular mudmat foundations for subsea structures are commonly designed according to ISO and API guidelines. However, the modern trend towards deeper waters and heavier structures is currently challenging traditional approaches to foundation design, especially in presence...

... spectrum analysis ground model model analysis pipeline system deformation interaction tie-in spool offshore pipeline project definition acceptance criteria level earthquake mudmat midstream oil & gas displacement subsea structure upstream oil & gas American Petroleum...

... effective measures and continued expansion of offshore developments, a hybrid subsea foundation, typically consisting of a mudmat and corner pin-piles, can offer significant fabrication and installation cost savings, compared to traditional large diameter suction piles, as flowline restraint anchors. Since...

..., the contribution to scour interaction from the different components is more difficult to assess. Large-scale mobile bed laboratory experiments evaluated scour for a surface laid pipeline, with a spur and valves, and a generic subsea protection structure with mudmats and a perimeter skirt. Bathymetry mapping...

.... A Hybrid Foundation is the combination of a skirted shallow foundation (so called mudmat) and pin-piles added at each corner of the mudmat. The adjunction of pin-piles increases the holding capacity of the single skirted mudmat by a factor of about 3, which falls then within the range of the anchoring...

... mudmat or hybrid foundation with pin piles would lead to excessive foundation sizes when axial expansions are large. Allowing the foundation to slide over the seabed as a whole could lead to a more economical solution ( Bretelle & Wallerand, 2013 ). A study has been initiated to develop a design...

... wellhead mudmat test tool drill pipe pad eye guidebase lockdown wear subsea wellhead lockdown sleeve drilling equipment drilling operation hanger protector iron roughneck upstream oil & gas conductor housing casing and cementing casing design rotary table conductor pipe OTC-25906...

... Abstract The paper presents a new subsea structure foundation concept and installation method, called the post-installed mudmat. With this new method, the thermal expansions and displacements of HP/HT flowlines are no longer limiting criteria for the subsea structures. It is applicable...

... bp exploration installation clearance limitation requirement relocation support pile mudmat upstream oil & gas waterflooding interface subsea system tolerance enhanced recovery seastate ppif interface receptacle otc 19217 pin-pile installation system ppif operation...

... & gas mudmat construction gripper production chemistry jacket design installation configuration assembly OTC 19218 ACG Jackets Design and Fabrication Richard T. Ciezarek, Kellogg Brown and Root Energy and Chemicals; Archie M. Cormack and Allan D. Penman, BP Exploration (Caspian Sea) Ltd...

..., 400te) and Locator Arm (LA, 275te) used together to accurately locate and drive pin piles into the seabed. Pin piles are typically used as alternatives to mudmats for temporary support of jacket structures in deep water soft clay sites, where the required mudmat area would be prohibitively large...

... contain conspicuous acknowledgment of where and by whom the paper was presented. Abstract Mudmats are large structures used to temporarily prevent offshore platforms or jackets from sinking into soft unconsolidated soil on the seabed. The functional life span of these mudmats is limited...

... mudmats. PLETs were designed with hinged mudmats for 'first-end' installation lay-away, but also had to be capable of second-end recovery to surface for repair and re-installation, if necessary. Introduction BP and its partners are developing several deepwater prospects in the Gulf of Mexico...