BS 6349-6 PDF

BS Page Figure 12 — Fluke to shank angle 24 Figure 13 — Comparison of chain strengths 27 Figure 14 — Chain fittings 28 Figure 15 — Metacare. Find the most up-to-date version of BS at Engineering BS “Maritime Works” Finishing the task. On. Monday 10th February hrs until hrs. Registration from hrs—at the Council Room.

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Secure, see Figure Where this is not design of works that involve dredging and the practicable, records over any winter period, or selection of dredging plant. Where the rate of siltation is not using conventional echo sounding equipment. The level of of fluid mud, systems are available in which a accuracy and the shore control requirements will gamma ray transmission gauge is mounted within a then be consistent throughout.

This permit safe navigation. The precise tests will be related to the circumstances of the project and the specific requirements. To a in rocks. Care b be exercised to ensure that Collision Regulations Ships and Seaplanes on the the pipeline is routed in such a way as to minimize Water and Signals of Distress Ships Order NOTE 8 Tests should include sensitivity performed on representative samples.

BS – Maritime structures. Design of inshore moorings and floating structures

Strength is important if the produce a fairly uniform level bottom and a pipe is to resist high internal pressures and relatively high rate of production. By observing the adjacent to sheltered waters. Due to these limitations the The performance of the dredger and of the dredged method should only be used to complement other formation should be properly monitored throughout and better investigative methods.

Consequently, the plant may not general suitability of each type of plant in relation to necessarily need to be exceptionally powerful or the site characteristics. The heavy construction and including those that contain debris or spudded pontoon of the rope-operated type permits for large machines boulders.


The suspension of bottom sediments may be 3. The presence of debris or foreign matter, e.

Lead lines not recommended when water depth exceeds 10 m. In most established datum. The stern winch Spud location of the pontoon is necessary to provide maintains an overall equilibrium in balancing tidal a positive reaction to the hydraulic digging action, forces or variations in the digging reaction.

Any dredged formation which intercepts the passage of mobile deposits will The geology of the coastal margins is almost be exposed to potentially heavy rates of siltation and invariably complex. This measurement is normally made by be able to navigate through this material without echo sounder see 2. Side-scan sonar can be described as a sideways Because side-scan sonar offers a simple method of looking echo sounder.

Hence trial dredging soft material. If the objective is to show that a excessive debris or foreign matter; the minimum design depth for navigation has been achieved, particularly when dredging in rock is b services; involved, survey lines should be very close. It is not suited to the dredging with a 6349-66 of anchors rather than with a of any materials with significant grain bonding. The magnitude of the maximum if necessary.

The use of survey sextants is described in 6. It is not normally practical for trailing raised and lowered through the layer of fluid mud, suction hopper dredgers 4. The use of a single shore station reflections from large, hard surfaces, such as ships simplifies the setting up procedure, provided that and buildings, and by interference from other radio the entire site is within range and enjoys a clear line transmitting equipment such as radar.

Swell compensators can be used to investigation as well as for bathymetry see 2. The simplistic quantities represent an annual requirement of approach does not take account of all factors, but maintenance dredging, the use of a small, normally provides a reasonable indication of the lightweight trailer may be most appropriate.

This allows rock quality to be dredging plant. Serrated blade cutters a Onshore pipelines.


BS 6349-6:1989

Since dredging generally extends over large areas, the effect of overdredging is normally to produce a substantial increase in quantities, particularly when the initial minimum quantity to be removed is small. In BS recommendations vs given to assist clients and engineers to obtain the basic data relevant to bw design of any maritime structure.

This replenishment material and material that is readily ideal situation may not always exist. In hoppers with chain-operated and gravel beds, may be best dredged by a suction, bottom doors, the sand may consolidate around the cutter suction or trailing dredger, which is not chains to such an extent that upon release of the suitable for cobbles and boulders.

If coastal stability is undertaken. The main 649-6 are low cost and usually its ease of operation from a small boat. If a bd detailed assessment is required, it is recommended BS Bottom finish is very operator dependent due to the difficulty of achieving a complete and overlapping The disadvantages of the bucket chain dredger coverage of the bottom, particularly in deep water or include a wide spread of anchors, which may disrupt where the strength of current is significant.

Material grain size has an important effect on pumping distance see Figure bx. Dredgers that do not exert a positive thrust in their digging action, such as wire line grab dredgers, may The most effective dredgers for dredging cobbles and not achieve satisfactory outputs in naturally boulders are those that would be used for well-graded sands of this nature. Still water Active water 3. NOTE 3 None of the figures are absolute limits, but operation outside these parameters is unusual and may be difficult.

Both types are calibrated by immersion in a medium of known density.