Mounts Flashcards
Why are mounts used in the RN?
To reduce the amount of radiated noise transmitted to the ships hull
What safety precautions must be carried out on equipment before changing mounts?
LOTO procedure
What ref can be used for changing mounts?
Mounts data manual MAP 01-473
UMMS Job card
What is the process for mount replacements?
Using jacking bolts closed to the mount
Prior to jacking up, loosen the mount nuts
Replace one mount at a time
What is the correct method for replacing mounts?
Replace mounts as a set
Use correct replacement mounts
Machine to be fully supported using jacking bolts
Name the 5 types of mounts?
J, M, L, PD and X
What measurements must be carried out after mount installation?
The deflection of the mount and the clearance of the base plate from seating
When using X mounts what must not be done?
Used in conjunction with other mounts
Must not be wrapped, tapped or covered in any way
What must the mounts not show signs of when supporting machinery?
Signs of displacement relative to ship structure
Spongy or contamination
Must allow a degree of dampening to prevent excess motion
After fitting mounts what must you do? (Especially on M and high load x mounts)
Allow the machine to settle for 24hrs and occasionally rock back and forth to allow permanent displacement
How are mounts protected during refit/build?
Protected by a wax wrap followed by a water adhesivefabric round them
What is creep?
Tendency of solid material to move or deform permanently under mechanical stress
How do you ensure correct locking of the nuts for the mounts?
New nyloc nuts are to be used
Bolts are to be of sufficient length to engage the element in the nut but not protrude more than one thread.
What are the correct fitting arrangements for a X type mount?
Head of the securing bolt from the inner side of the mount. Threads protruding and the nylon brushing provided are to be used.
What should be fitted to mounts in a hostile environment?
Heat and oil shield with a min 6mm clearance
