Marine Auxiliary Machinery

Chapter 8 Lesson 9

Spare Parts

Learning objectives

Learning objectives

learn the different levels of spare parts.

Maintenance on Board (1)

Use of correct spare parts is essential for trouble free operation of the steering gear.

It is very difficult or impossible to predict the exact life of a part exposed to wear, or age.

What parts that are to be kept on board depend on what level of safety the ship operator wants.

Maintenance on Board (2)

The safety policy can be divided into three readiness levels:

1 Basic level This level meets the minimum class requirement.

2 Essential spare parts: Essential spare parts are classed as follows: Every part

exposed to wear or ageing and for which a defect may cause critical failure. (Critical failure: steering gear partly or complete out of function ).

Maintenance on Board (3)

3 Maker’s recommendations: Keeping all essential and necessary parts on board to

perform planned maintenance and keep off-hire to a minimum.

By the use of makers experience and knowing which level of safety the owner wants, the makers should always be able to supply a suitable package of spares. For older steering gears (more than 15-20years of age ) every part should be taken into consideration because of a possible long delivery time.

Assessment Tests

Question 1 of 3 Which of the parts mentioned below are normally

not exposed to wear or ageing? A) Static rubber seals B) Relays and sensors C) Cast iron sealing bars D) I don't know.

Assessment Tests

Question 2 of 3 Which of the statements below belongs to porsgrunn

spare parts policy? A) Essential spare parts are to be kept on stock.

B) All spare parts are to be kept on stock. C) No spare parts for steering gears older than 30 years.

D) I don't know.

Assessment Tests

Question 3 of 3 Which of the factors do you believe will not affect the

lifetime of the brass bearings in the actuator: A) Rudder arrangement and alignment of rudder stock

from the steering gear installation. B) Pureness of the oil.. C) No spare parts for steering gears older than 30 years.

D) I don't know.