Section 2 Materials and Workmanship

201. Materials

The materials for members specified in this chapter are to comply with the requirements in Pt 2

and Pt 2, Ch 1. of Rules for the Classification of Steel Ships.

202. Material protection

1. When the appendage, or parts connected to it, is made from material different from the hull, such that a risk for galvanic corrosion arises, an approved coating system and/or approved cathodic pro- tection will be required.

2. Fatigue resistance in sea water may have to be documented upon request.

203. Welded constructions

1. Weld is to be full penetration weld only. Necessary preheating is to be applied for parts of sub- stantial thickness, according to approved procedure.

2. Non-destructive testing is to be carried out on the following weld :

(1) Connection appendage/hull

(2) Connections between separate parts of the appendage (e.g., shaft boss/bracket arm)

(3) Important hull weld

Pt 4 Hull Equipment

Ch 2 Hull Appendages Pt 4, Ch 2

(4) Connection weld for ears for hydraulic cylinders and important link members

3. All weld are to be ground flush with the corners rounded well.

204. Cast constructions

Surface finish is to be closely examined, after removal of lifting ears etc.

205. FRP/sandwich constructions

1. Only approved raw materials are to be used. Lamination plans and procedure are to be approved before production starts.

2. Any overlamination of metal parts is to take place after thorough grinding of metal surfaces cording to approved procedure.

ac-