UMAT – SUBSEA MATTRESS SYSTEM

The Umat Subsea Mattresses are available for hire or optional purchase. The system includes several types of subsea mattresses, each developed to include functionality, features and capacities suitable for specific applications and seabed conditions.

Support capacity is maximized by low weight, high strength material, high overall stiffness, stiffness in two directions / horizontal plane where applicable, and minimization of gaps and openings within the assembly / between mattress segments. Application and particulars are:

  • Landing support, temporary support, permanent support including flowline sleeper support, heavy-duty support, extreme-duty support, separation, stabilisation, protection, dredged area cover, blanket, soft seabed cover, ingress protection, rock dump support.
  • Soft seabed support.
  • Deployed without use of lift spreaders (beams or frames).
  • Deployed as one unfolded length or in ROV basket, single or multiple.
  • If required, provided with rigging for deployment and installation.
  • Several types permit ROV positioning on the seabed.
  • Available in various sizes, and for some types Umat units can be interconnected as hinged segments thereby forming larger seabed mattress units.
  • Several optional configurations and features are available for all Umat mattress types.
  • Seabed sled configuration (TS Umat).
  • Optional high friction fabric surface.
  • Optional mud skirt for seabed penetration and stabilization.
  • Optional stiffeners between segments (HD Umat).
  • Can be adopted, modified, configured to suit any specified requirements and/or application.

TS Umat - Temporary Seabed Support Mattress

TS Umat subsea mattress.

Rental

Lightweight high load capacity, soft or hard seabed, temporary seabed support mattress.

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For flowline and umbilical termination heads, connectors, PLR’s, UTA, SUTA, tooling, diver operations and other seabed landed equipment (the most commonly used Umat mattress). It permit ROV positioning / re-positioning on the seabed.

Installed without the use of dedicated lift spreader. Available with optional deployment / recovery rigging and any fists for ROV handling attached to the mattress.

Available as single mattress or as a hinged mattress assembly with up to 5 interconnected mattresses.

Typical dimensions (W x L x H) and weights are:
1 segment mattress: 3.60m x 2.0m x 0.08m / 70 kg dry & 50 kg in seawater.
5 segment mattress: 3.6m x 10.2m x 0.08m / 358 kg dry & 268 kg in seawater.

Other, widths lengths, and mattresses with or without additional longitudinal or transverse stiffeners are available on request.

Datasheet includes dimensional details, weights, illustrations, description of features, configuration details and options.

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TS Umat Sled - Subsea Seabed Sled

TS Umat sled subsea mattress.

Rental

The TS Umat Sled is a single segment TS Umat that have been provided with a sled adapter.

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Used for pulling heavier subsea equipment into and out from locations which is not accessible for surface crane hooks and/or when the equipment is too heavy for the ROV to move and / or where buoyancy cannot be used to move the equipment.

Dimensions (W x L x H) and weights are: 3.90m x 2.0m x 0.32m / 120 kg dry & 93 kg in seawater.

Optional additional features are: 200mm high side and end walls (GRP material); rigid bottom surface (GRP material); longitudinal or transverse mattress stiffeners; second hinged segment in the rear end (i.e. an additional length of 3.6m).

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HD Umat - Heavy Duty Seabed Support Mattress

HD Umat subsea mattress.

Rental

Lightweight very high load capacity temporary or permanent seabed support mattress.

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For soft or hard seabed. Primarily intended for supporting very heavy equipment with a small footprint (E.g. DMA’s). It does not include parts that can corrode. It permit ROV positioning / re-positioning on the seabed.

Includes integrated webbing slings, and is deployed without the use of a lift spreader. Available with optional deployment / recovery rigging and any fists for ROV handling attached to the mattress.

Available as 1, 2, 3, 4 or 5 segment mattress.

A mattress with two or more segments can be arranged to include inter-segment stiffeners which will create a larger rigid support area.

Typical dimensions (W x L x H) and weights are:
1 segment mattress: 3.8m x 1.4m x 0.06m / 118 kg dry & 33 kg in seawater.
5 segment mattress: 3.8m x 6.6m x 0.06m / 535 kg dry & 167 kg in seawater.

Other widths, lengths, and configurations are available on request.

Datasheet includes dimensional details, weights, illustrations, description of features, configuration details and options.

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SSP Umat - Separation, Stabilisation & Protect. Mattress

HD Umat subsea mattress.

Rental

Subsea mattress for separation, stabilisation and / or protection applications.

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Temporary or permanent installed subsea mattress for soft or hard seabed. Application can be either as separation mattress, stabilisation mattress or protection mattress. The mattress includes 23 off heavy wall thickness PE tubes and two SHS profiles (GRP).  The mattress weight can be varied by varying the number of PE tubes that are sand filled.

Includes integrated webbing slings, and is deployed without the use of a lift spreader or frame. Available with optional deployment / recovery rigging and fists for ROV handling / positioning attached to the mattress.

Optional lightweight mattress versions can be delivered rolled up with integrated ROV lifting, positioning and unfolding arrangement.

Can be used as protection mattress for subsea equipment. This includes temporary protection of seabed located equipment from crossing of holdback wires, laydown wires, anchor lines and similar.  

The standard SSP Umat Type A1.2 dimensions are (L x W x H): 3.1m x 3.2m x 0.09m. Other widths, lengths, and thicknesses are available on request.

Can be used to as sea line crossing arrangement when used in combination with Ubags Type A1-100 (Mod.). In this case the SPP Umat including Ubags are deployed in an ROV basket in order quickly arrange one or more sea line crossings using the ROV. Separation may be up to 300mm or more.

Datasheet includes dimensional details, weights, illustrations, description of features and options.

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ED Umat - Extreme Duty Seabed Support Mattress

ED Umat subsea mattress.

Rental

Very high load capacity temporary support mattress for soft or hard seabed.

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Primarily intended for very heavy equipment with a large footprint and/or an assembly that provides limited seabed support (e.g. subsea winch package, long subsea basket and similar).

Includes integrated webbing slings, and is deployed without the use of a lift spreader. Available with optional deployment / recovery rigging and any fists for ROV handling attached to the mattress.

Standard mattress includes 20 off square hollow section steel, SHS profiles, equally spaced at 277mm along the mattress length. Up to 18 off additional SHS profiles can be included. Dimensions are 5.5m x 3.2m x 0.07m (L x W x H) / 540 dry – 472 kg in seawater.

Other widths, lengths, and configurations are available on request.

Datasheet includes dimensional details, weights, illustrations, description of features, configuration details and options.

Purchase

SB Umat - Seabed Support or Covering Blanket

SB Umat subsea mattress.

Rental

Tear and wear resistant high strength blanket for subsea / seabed use.

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Used to cover areas with soft seabed, mud and silt. It will also provide support and prevent sink in of rock dump or similar placed on the seabed. It can also be used to cover subsea equipment and structures to eliminate potential snag points, or to collect / prevent ingress of debris, sand, mud, drill cutting, or other on subsea equipment parts / assemblies. It will protect structures and items from wear and erosion resulting from current and sand flow along the seabed (e.g. ropes in concrete mattresses).

Delivered rolled up with integrated ROV lifting, positioning and unfolding arrangement. Arrangement includes lifting handles, securing straps and corner firsts for final seabed positioning.

Available as small or large blanket (standard). Dimensions are 3.6m x 2.0m x 0.02m & 5.1m x 3.2m x 0.02m (W x L x H). Multiple blankets can be combined in order to make a larger / longer blanket.

Blanket weight and seabed unfolding is accommodated by 20mm wire located in pockets included along all four sides of the blanket, or as an option a 2” dia. sand filled hose. If required additional longitudinal or transverse wires / hoses can be incorporated into the blanket for weight / positioning purposes.

Other widths, lengths, and configurations is available on request.

Datasheet includes dimensional details, weights, illustrations, description of features, configuration details and options.

The Video Link dempmonstrate ROV lifting, placement and unfoldiong of the SB Umat.

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SI Umat - Subsea Instrument & Small Items Support Mattress

SI Umat subsea mattress.

Rental

Lightweight very high load capacity and stiff temporary (or permanent) support mattress.

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For soft or hard seabed. Primarily intended to provide seabed support for subsea instruments including tripods or other smaller items, DMA’s or structures that have limited footprint. It does not include parts that can corrode.

Dimensions and weights are 1.9m x 1.4m x 0.06m (L x W x H) / 59kg dry – 17 kg in seawater.

Includes integrated webbing loops in each corner for lifting and handling, including ROV positioning. Using a pennant wire arrangement, it can be deployed together with the equipment it is intended to support.

Other widths, lengths, and configurations are available on request. It can also be delivered with transponder buckets or other instrument parking interfaces integrated into the mattress.

Datasheet includes dimensional details, weights, illustrations, description of features, configuration details and options.

Purchase

Umat Deployment and Recovery Rigging

TS Umat with deployment and recovery rigging option.

Deployment and recovery rigging for the Umat mattresses is available as an option.

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TS, HD and ED Umat can as an option be delivered with deployment and recovery rigging + Ufist Ball Fists for ROV positioning and repositioning on the seabed. This typically includes:

  • 5 off Ufist ball fists, (4 off large on mattress, 1 off small on link), 1 off Master Link, 2 off 4.75t shackles, 2 off 3/6m -1t soft sling.

This rigging is attached to the Umats prior delivery.

The SB Umat is recommended to be deployed in a ROV basket (e.g. Ubas G ROV basket). The mattress includes the ROV rigging that is required retrieve it from the basket, position and unfold it on the seabed.

The following rigging can also be provided:

  • Pennant wire, 8 m, with ROV hook in one end, a master link in the other end.
  • Ballast Sling Assembly for deployment (1 off webbing sling, 1 off Ubag, 2 off shackles and 1 off release link).
  • Ballast weights, Ubags, permanently attached to the TS or HD Umat.

All lifting equipment is delivered with certificates.

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