DLM Tailor made Saddleback Holdback Tensioner for Subsea Cable

Dynamic Load Checking (United kingdom) Ltd. (DLM), of Southampton, Uk expands its currently comprehensive vary of line rigidity measurement technology.

The merchandise, which brings together the established Saddleback merchandise from DLM’s catalogue with an supplemental Hold Back again Rigidity aspect, is staying mostly utilized by the vessel NKT Victoria, with more gadgets in the pipeline for a quantity of buyers.

When consulted about a alternative for measuring line tension and generating a holdback pressure for a cable lay task, DLM, a expert in the design and style, manufacture, repair service and calibration of load cells and load checking gear, devised the Saddleback Holdback Tensioner (SB-HBT).

The SB-HBT (it weighs 450kg) works by building extra line pressure on the subsea cable jogging through it, particularly for bundled cable lays. A Saddleback can evaluate line rigidity from to 5,000kg and is suited for extra sensitive cable, which includes telecommunication cables or significant cable exactly where a Functioning Line Observe is unsuitable. Moreover, a twin pair of Dunlop 18 x 7 SMO LCE tyres are connected to a hydraulic cylinder to clamp the two wheels jointly, and a disc braking process is utilised to command the rotational speed of the wheels on the SB-HBT. The system can build 750kg of clamping force among the wheels and holdback 500kg of line pressure. On the top wheel there is an encoder to evaluate velocity and length.

Chris Scrutton, technological manager at DLM, explained: “This is the initial prerequisite we have experienced [for the SB-HBT] but we have discussed it with other opportunity consumers this seems to be a reoccurring issue aboard vessels. It can be used when a cable laying vessel is completing a new lay job, and desires to manage the departure pace to smaller diameter cables staying bundled together with greater cable diameters. The explanation for carrying out this is that the little diameter cable generally does not bundle tightly plenty of with the greater diameter cables and can run no cost of the bundle when departing off of the vessel.”

In this instance, NKT, a company of turnkey cable options that fulfill the at any time-increasing demand from customers for power, is using the SB-HBT on a 22mm-diameter fibre optic cable. The ‘holdback’ (holdback pressure is essentially a term for adding line tension to a cable) component of the gadget creates further pressure to management the departure pace of the cable for bundling with DC power cable prior to becoming laid subsea.

An Enerpac cylinder compresses the top rated and bottom wheel alongside one another to produce grip pressure on to the cable just before the brakes are utilized to slowly rotate the wheels. Without having clamping the two wheels collectively, the cable would merely run free of charge. The (orange) HBT element houses all of the components, when the Saddleback is the product bolted to the front of the body.

Scrutton said: “This was another venture exactly where we had been approached by a shopper with a design transient to create a solution for their application. NKT had a distinct requirement for a system that could evaluate the line pressure and make the holdback force. The notion went from a style and design discussion to a sent product in fewer than six months.”

An Enerpac cylinder compresses the top and bottom wheels together.
An Enerpac cylinder compresses the leading and bottom wheels together.
The tyres are connected to a hydraulic cylinder to clamp the wheels together.
The tyres are linked to a hydraulic cylinder to clamp the wheels alongside one another.

Make contact with for editorial enquiries: Jodie Donelan, jodie@dlm-united kingdom.com