Rigging Theory N2 — Memo

August 2021 — N2 — Rigging Theory

N2 2021 Nated Engineering

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Q1— Section header —

1.2.1Centre wire is covered with small wires. Small wires covered by larger wires in grooves and layers in a strand are equal but lengths are unequal.

1.2.2Six smaller wires are laid on the crown of the inner wires. A strand of 19 wires in which the outer wires are of two sizes alterna tely.

1.2.3Develops a type of non spin rope. The ordinary lay works against the lang s lay. Called concentric stranded ropes.

1.3(3\

1.4Open spelter socket Single eye with a solid thimble Single eye with a thimble (3\ [20]20

Q2— Section header —

2.1Ensure the air pipe is securely fitted to the winch and the air line. Ensure the winch is secured to a structure. Ensure the safety guards are fitted on the winch. Ensure there is a proper braking system on the winch.

2.2Step1: Hold harness by the back ring and shake harness to allow all straps to fall in place. Step 2: Release any straps that are buckled or tangled. Step 3: Slip straps over shoulders so the back ring is located in the

2.3Wear on the sheave. Cracks on the sheave. Kinks on the sheaves. (2\ [15]15

Q3— Section header —

3.1Haulage depressing rollers are usually confined to the dead side of a haulage rope or in front of the back balance or tension carriage. The rollers are also used to guide the rope onto the drum, fleeting wheel or return and tension

3.2.1Protection of sheave wheels is safety guards that are mounted over the sheave wheels They are made from woven wire, expanded metal or perforated metal.

3.2.2Rope supports are used to guide the haulage rope in a number of ways and also depends on the contour of the ground it passes over. All the rope supports must be kept in a good condition and lubricated so that the rope can run freely.

3.2.3External corrosion can be seen and assessed but internal corrosion is sometimes present with little or no indication on the outer wires. If there is internal corrosion use spikes to check the rope. (2\

Q4— Section header —

4.1Reducing peak power demands Result in a substantial saving (2\

4.2Check if terrain around drum is accessib for employees. Check the type of equipment that is required. Check the height of the building for easy movement. Check ends of the building are opened or closed.

4.3Ensure the rope has no defects. Ensure the pulleys and sheaves are not jammed and are in good condition. Ensure the braking system has no wear or any other defects. Ensure the cabin is not rusty or has any defects.

4.4Very simple in operation Only one brake is required Extension is very easy (4\ [15]15

Q5— Section header —

5.1Lower the crane hook until the plate is placed correctly and there is slack on the sling attached the crane hook and plate grab. Release the locking lever on the plate grab and remove from the plate. Remove the sling by moving the

5.2Check for cracks. Check for corrosion Check for wear Check for kinks (4\

5.3Safe Working load (SWL\ is the mass or force that a lifting equipment, lifting device or accessory can safely lift, suspend, or lower without fear of breaking. (2\ [10]10

Q6— Section header —

6.1.1Stability reach is the distance of the jib head pin from the point of intersection of the nearest base line and the vertical plane passing through the centre line of the jib.

6.1.2Outreach is the horizontal distance from the centre line of the ho ok to the nearest point on the chassis.

6.1.3Margin of stability is the percentage additional load required to bring the crane to the condition of tipping when it is handling the afe Working Load at any raduis. (6\

6.2Locomotive crane Automotive crane Crawler crane Three wheel industrial crane (3\

6.3he tower is set up from two poles or masts with their bottom ends spread from each other and their top ends join together. rossbars connect the two poles, forming a shape tower. The tower is anchored to the ground for

6.4Hook a safe working load on the overhead crane and lift the load slowly from the ground and then stop. Check if there is any movement of the load, if there is movement readjust the brakes until it is safe to lift the load.

6.5Ensure the gin pole is secured to the ground properly. Ensure the rope blocks are tightened correctly and securely Ensure the rope moves freely and there are no defects. (3\ [20]20

Q7— Section header —

7.1.1

7.1.2

7.1.3Mt = M1 + M2 = 500 kg + 9900 kg = 10 400 kg [10] TOT AL:10

Mark Allocation

Sections20 + 15 + 10 + 15 + 10 + 20 + 10 = 100 marks

Paper information

TitleMemo

SubjectRigging Theory

LevelN2

Document typeNated Engineering

Year2021

MonthAugust

Pages6

Downloads5

Examination context

Decade2020s

Years ago5y

SeasonWinter (SH)

Start daySunday

Exam periodAugust 2021

Days since exam1,897

About Rigging Theory examination preparation

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For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

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