Section 4 Anchors

401. Applications

The anchors on craft dealt with in this chapter are to comply with of equivalent quality.

the requirements below or be

402. General

1. Anchor types

(1) H.H.P. (high holding power) anchor

(2) S.H.H.P. (super high holding power) anchor

2. When two anchors are selected, the mass of individual anchors may vary by ±7 % of the values given in Table 4.3.2, provided that the total mass of anchors is not less than would have been re- quired for anchors of equal mass.

3. The mass of the head is not to be less than 60 % of the values in Table 4.3.2.

403. Materials

Materials used for anchors are to comply

Steel Ships.

with

Pt 4, Ch

8. of Rules for the Classification of

404. Drop and hammering tests

Drop and hammering tests are to comply

Steel Ships.

with

Pt 4, Ch

8. of Rules for the Classification of

405. Proof tests

Proof tests of anchor are to comply with Pt 4, Ch 8. of Rules for the Classification of Steel Ships. The proof test load, however, for hight holding power anchor is to be the load specified for an ordinary anchor of which the mass is equal to 2 times the actual total mass of a high hold- ing power anchor.

406. Additional requirements for S.H.H.P. anchors

1. S.H.H.P. anchors for which approval is sought, are to be tested by requirements in Guidance for Approval of Manufacturing Process and Type Approval, ETC. to show that they have a holding power per unit of mass at least 4 times that of an ordinary stockless anchor.

2. If approval is sought for a range of anchor sizes, at least two sizes are to be tested. The mass of

Pt 4 Hull Equipment

Ch 3 Equipment Number and Equipment Pt 4, Ch 3

the larger anchor to be tested is not to be less than 1/10 of that of largest anchor for which ap- proval is sought. The smaller of the two anchors to be tested is to have a mass not less than 1/10 of that of the larger anchor to be tested.

407. Marking

1. Where anchors have satisfactorily passed the tests and inspections, they are to be stamped with the Society's brand in compliance with Pt 4, Ch 8. of Rules for the Classification of Steel Ships.

2. In case of high holding power anchors, "SH" is to be stamped in front of the Society's brand in addition to the stamps specified in Par 1.