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151/23/007 > Mounts > Flashcards

Mounts Flashcards

1
Q

Why are resilient mounts used on a ship?

A

To reduce the amount of radiated noise transmitted to the ships hull

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2
Q

What safety precautions must be carried out on equipment before changing mounts?

A

LOTO procedure

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3
Q

What references can you use for information on changing mounts?

A

Mounts data manual - MAP 01-473
UMMs job card

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4
Q

What is the process when carrying out mount replacements?

A

Loosen the mount holding down nuts
Use jacking bolts closest to mount
Replace one mount at a time

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5
Q

What is the correct method of changing mounts?

A

Replace mounts as a set
Use correct replacement mounts
Machine to be fully supported using jacking bolts

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6
Q

Name 5 types of mounts used in the RN

A

J
M
L
PD
X

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7
Q

What measurements must be carried out on a mount after installation

A

The deflection of the mount or clearance of the base plate from seating

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8
Q

When using X mounts what must not be done?

A

Must not be used in conjunction with any other mounts
Must not be wrapped, taped or covered in anyway

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9
Q

What must mounts not show signs of when supporting machinery?

A

They must not show any signs of displacement, relative to ships structure
Must not appear spongy or contaminated
Must allow a degree of dampening to prevent excess motion

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10
Q

Once mounts have been replaced what must you allow the machine to do?

A

If time allows, especially on M mounts and high load X mounts, allow machine to settle for 24 hours and occasionally rock back and forth to allow permanent displacement

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11
Q

During a build or refit, how are mounts protected?

A

A waxed wrap followed by a water adhesive fabric around them

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12
Q

What is creep?

A

The tendency of a solid material to move or deform permanently under the influence of mechanical stress

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13
Q

How do you ensure the correct locking of the nuts for each mount

A

Nyloc nuts are to be fitted. The holding down bolts are to be of sufficient length to fully engage with the nylon element of the locknut, but should not provide through their nuts by more than one thread

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14
Q

What are the correct fitting arrangements for an X mount?

A

The head of the securing bolt should be fitted from the inner side of the mount
the threads protruding outwards and nylon brushing provided is to be used

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15
Q

What should be fitted to mounts if they are in a hostile environment

A

Heat and oil shields with a minimum 6 mm clearance

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16
Q

When inspecting mounts What points should be considered?

A

Paint, oil or fuel contamination
Signs of distortion, damage or misshaping
Creep
Over tightening
Incorrect fitting

17
Q

When does an X mount need to be replaced?

A

When greater than 20% of damping compound has seeped
12 years after date of manufacture due to degradation of damping compound

18
Q

What allowances should be made when taking measurements after installation?

A

Temperature changes
X mounts 40 mm clearance around the machine

19
Q

In addition to the mounts what other component parts can be fitted?

A

Accelerator and deceleration units

20
Q

What is the adjustment height for both the L and M type mount decelerator?

A

Clearances are set to 3mm
(Tolerances -0mm, +1mm)

21
Q

What is the outcome if tools or projections are left around or under a machine base?

A

It impairs the efficiency of the mounts and prevents the full movement of the machine during shock/ vibration

22
Q

What are the correct fitting arrangements for an X mount?

A

The head of the boat should be fitted from the inner area of the mount
The threads protruding upwards and all nylon brushing provided are used

23
Q

When carrying out an inspection after installation what should you look for?

A

All jacking bolts have been raised clear
All tools and loose gear have been removed

24
Q

When replacing mounts what must you consider?

A

Replace the mounts one at a time leaving packing pieces in their original position

25
Q

Draw and label the X mount

A

Refer to docket

26
Q

In the event of shock damage, what must be carried out and when?

A

VA of equipment and mounts as soon as operational circumstances permit

27
Q

What is the application of a PD mount

A

It is a general purpose mount for heavy equipment
Not a fully captive design therefore fitted with accelerators and decelerators

28
Q

How are mount positions identified?

A

Using lettering system A,B,C and D
Starting stbd fwd corner working clockwise

29
Q

How is deterioration of rubber mounts indicated?

A

Soft to touch
Swollen
Sticky to touch
Aged
Heat hardened
Oxidised/ crumbled

30
Q

What is the load range of L mounts?

A

5-130kg

31
Q

What is the total range covered by M mounts?

A

340-450kg

32
Q

What is the load range of X mounts?

A

9-550 kg

33
Q

What is the load range of PD mounts?

A

750-2500kg

34
Q

When should checks on a J mount be carried out?

A

Every 4 years or after the vessel has been in The vicinity of an under water explosion

35
Q

Why is vibration isolation necessary?

A

Minimise radiated and self noise to improve habitability for the crew

151/23/007 (9 decks)

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