	Introduction	6
	1. General
	Mooring systems	9
	Mooring components	11
	Mooring line	11
	Chain	11
	Wire rope	11
	Synthetic fibre rope	11
	Connectors	12
	Shackles	12
	Connecting link kenter type	12
	Connecting link pear shaped	12
	Connecting link c type	12
	Swivels	13
	Anchoring point	13
2	Dead weight	13
	Drag embedment anchor	13
	Pile	14
	Suction anchor	14
	Vertical load anchor	14
	History of drag embedment anchors	15
	Characteristics of anchor types	16
	History of vryhof anchor designs	18

2. Theory
Introduction	23
Criteria for anchor holding capacity	24
Streamlining of the anchor	24
Shank shape	24
Mooring line	25
Criteria for good anchor design	26
Aspects of soil mechanics in anchor design	27
Soil classification	28
Fluke/shank angle	30
Fluke area	31
Strength of an anchor design	32
During proof loading	32
While embedded in the seabed	32
During anchor handling	32
Strength of the shank	33

Table of contents

Strength of the fluke	33
Strength in extremely hard soils	34
Anchor loads and safety factors	35
Anchor behaviour in the soil	37
Drag embedment anchors	37
The set-up and consolidation effect	37
The rate effect	38
Vertical load anchors	38
Proof loads for high holding power anchors	39
Quality control	41
Anchor tests	42
Introduction	42
Reading test curves	43
Test results	44
Norwegian Contractors (1984)	44
Large scale anchor tests in the Gulf of Mexico	45
Uplift	45	3
Cyclic effect factor	46
Tests with Stevmanta anchors	46
Soil table	48
3. Practice
Introduction	51
Soil survey	52
Pile or anchor	53
Setting the fluke/shank angle	54
Introduction	54
Changing the fluke/shank angle on the
Stevpris Mk3	54
Changing the fluke/shank angle on the
Stevpris Mk5	55
Connecting a swivel to the Stevpris anchor	56
Chasers	58
Chasers and their application	58
Chaser types	60
The J-chaser	60
The permanent chain chaser	60
The detachable chain chaser	61
The permanent wire chaser	61
The J-lock chaser	62
Stevpris installation	63

Table of contents

	Stevpris deployment for modus	63
	Introduction	63
	Laying anchors	63
	Retrieving anchors	65
	Anchor orientation	66
	Decking the Stevpris anchor	66
	What not to do!	68
	Racking the Stevpris	69
	Deploying the Stevpris from the anchor rack	69
	Boarding the anchor in deep water	70
	Ballast in fluke	71
	Chaser equilibrium	72
	Deployment for permanent moorings	73
	Piggy-backing	74
	Introduction	74
	Piggy-back methods	75
4	Piggy-backing involving hinging anchors	75
	Piggy-backing with two Stevpris anchors	76
	Piggy-backing by using a chaser	77
	Stevmanta VLA installation	78
	Introduction	78
	Single line installation procedure	78
	Installation procedure	79
	Stevmanta retrieval	80
	Double line installation procedure	82
	Stevmanta retrieval	83
	Double line installation procedure with
	Stevtensioner	84
	The Stevtensioner	88
	Introduction	88
	The working principle of the tensioner	88
	Measurement of the tensions applied	90
	Duration of pretensioning anchors and piles	91
	Handling the Stevtensioner	92
	Stevtensioner product range	93
	Supply vessels/anchor handling vessels	94

Table of contents

4. Product data
Introduction	97
Dimensions of vryhof anchor types	98
Stevin Mk3	98
Stevpris Mk5	99
Stevshark Mk5	100
Stevmanta VLA	101
Dimensions of other anchor types	102
Proof load test for HHP anchors	104
Dimensions of vryhof tensioner	106
Proof load/break load of chains	108
Chain components and forerunners	110
Connecting links	112
Conversion table	113
Mooring line catenary	114
Mooring line holding capacity	115
Shackles	116	5
Wire rope	118
Wire rope sockets	120
Thimbles	123
Synthetic ropes	124
Mooring hawsers	126
Main dimensions chasers	128
Stevin Mk3 UHC chart	130
Stevin Mk3 drag and penetration chart	131
Stevpris Mk5 UHC chart	132
Stevpris Mk5 drag and penetration chart	133
Stevmanta VLA UPC chart	134

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