Chapter 3 Flashcards
What is a derrick
A “derrick” is an apparatus consisting of a mast or
equivalent member held at the head by braces or by guys, with or without a boom, for use with a hoisting
mechanism and operating ropes.
What is a crane
A crane is a machine for lifting and lowering a load and
moving it horizontally, with the hoisting mechanism an
integral part of the machine. Cranes whether fixed or
mobile are driven manually or by power.
Swinging derrick is another way of _________ a single derrick to not only heave and lower the cargo wire rope but also give it the ability to _____ the cargo on ship into the hold or off the ship onto the _________.
In this arrangement, the _____ take the form of short pendants coupled with tackles. Generally ___ tackles are fitted, but heavy derricks may be fitted with as many as ____. Some derricks are provided with standing guys called _________ guys, which are fitted to prevent the derrick from _________ too far in a certain direction.
rigging
slew
quayside
guys
two
four
preventer
swinging
What is a union purchase
It is the most common arrangement used with derricks on general cargo vessels. Two derricks
are coupled by a union hook and are worked in conjunction with each other. Each cargo boom is joined to vertical mast or post by a swivel fitting known as goose-neck
How many precautions have to be complied with as per lloyds code for union purchase
13
The following precautions have to be complied with as per Lloyds’ code for union
purchase:
1.Minimum operating angle shall not be less than 15 ̊to the horizontal (ideally not less
than 30 ).
2.The maximum included angle between the cargo runners must not exceed 120 ̊
3.The maximum outreach beyond the mid-ship breadth of the ship should not be less
than 4 metres.
4.The minimum head-room for derricks of SWL higher than 2 tonnes is 5 metres.
5.The tension should be taken off the slewing guys when the rig is set up so that only the
preventer guys are taken into account in calculating forces on the rig.
6.SWL of the rig is to be a percentage of the minimum SWL of any part of it with a safety
margin (25% less) included.
7.Unduly long slings should not be used.
8.The standing guy of the boom over the side should not be placed too far back to
prevent jack-knifing and it also should not be secured too close to prevent unnecessary
increase in stress on the loading guy.
9.Head-room beneath the load should be kept to a minimum required for safety.
10.The standing guy should be of adequate strength.
11.A union hook with a swivel should be used to connect the cargo runners.
12.Runners should be prevented to rub against the ships’ sides/ bulwarks/ railings and
hatch coamings etc.
13.Rigging of the derricks should be supervised by a competent person.
3 derrick and crane movements
Hoisting/Lowering
* Luffing
* Slewing
Heavy duty cranes
These heavy-duty cranes are often used for constructing ports and bridges.
They are useful for loading and unloading heavy items to and from ships.
MGN
Marine Guidance Notes
What does PUWER stand for
Provision and Use of Work Equipment Regulations
MGN 331
* . Maintenance should include regular examinations by a _________ person. It is recommended that these be carried out as necessary but at least once _______ and include checks for general material defects such as ______, _______ and ___________ that will affect safety or ability to perform required function.
4.2
competent
annually
cracks
distortion
corrosion
MGN 331
* . It is strongly recommended that the maximum
interval between inspections should be _ years for
work equipment, or such shorter period as is
recommended by the __________. Further guidance on inspections should be aligned with equipment manufacturers’ recommendations.
3.2
5
manufacturer
What is a competent person
means a person possessing the knowledge or experience necessary for the performance of the duties under these regulations;
Regular preventative maintenance
3.4 Greasing should be thorough and frequent, as ___ bearings impose additional loads that can lead to failure.
3.5 The condition of all ropes and chains should be checked regularly for ____, ______ and _______ and replaced as necessary.
3.6 Shackles, links and rings should be renewed when wear or damage is _____.
3.7 Structures should be examined frequently for corrosion, cracks, distortion and wear of bearings, securing points etc.
3.8 _____ structures such as gantries or masts should be checked for trapped water inside. If water is found, the structure should be drained, appropriately treated and then ______.
3.9 There should be regular ________ tests of controls, stops, brakes, safety devices for hoisting gear etc,
preferably before the start of ________.
dry
wear
damage
corrosion
evident
hollow
sealed
function
operations
LOLER
Lifting Operations Lifting Equipment Regulations
Loler “regular examinations”
Maintenance should include ______ examinations by a _________ person at least once annually. Checks should look for general material defects such as cracks, distortion, corrosion and wear and tear that could affect safe working load and overall strength
regular
competent
