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Национальный университет Одесская морская академия (бывш. ОНМА)

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[НЕСОРТИРОВАННОЕ]

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Anchor Handling Simulator Course.pdf

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Main dimensions chasers

G		G	F	G	G
	H	H			H
D				A
		D		A
	A	D		A	C
				A

		B	E
				D	E
B	E			B
B	E
J-Chaser		J-Lock Chaser		Permanent Wire Chaser
VA 101		VA 115		VA 210-213-214-215
G		G
	H			H
	H
128
A		A
A
	C	C
	F			F
D	E	D		E
D	E	B
B		B
B
Permanent Chain Chaser		Detachable Chain Chaser
VA 102-106-110-112		VA 107-108-111

main dimensions chasers dimensions in mm

Type		A	B	C	D	E	F	G	H	proofload	weight
										t	kg
VA	101	2483	1829	-	699	305	-	124	86	250	1882
VA	102	1657	1143	991	762	305	191	124	86	250	1088
VA	106	1702	1168	991	762	381	203	130	99	250	1451
VA	107	1886	1143	1080	762	305	191	124	86	250	1238
VA	108	1931	1168	1067	762	381	203	130	99	250	1656
VA	110	1867	1245	1130	838	330	203	130	99	250	1433
VA	111	1994	1245	1130	838	330	203	130	99	250	1742
VA	112	2210	1384	1397	953	356	260	130	99	250	2064
VA	115	2083	1486	-	711	533	305	124	86	250	1778
VA	210	2073	1245	1203	838	432	330	130	99	250	1959
VA	213	1962	1099	1086	692	445	330	130	99	250	1846
VA	214	2318	1308	1397	902	508	330	130	99	250	2530
VA	215	2051	1168	1060	711	445	356	178	127	400	2495

Note: the VA115 is available in two versions: the VA 115/35 for 21/2” to 31/2” chain and the VA115/45 for 33/4” to 41/2” chain.

Restoration of worn chaser profiles.

Worn profiles may be restored by application of a weld deposit. Care must be taken to ensure a satisfactory bond between parent material and the weld deposit and to avoid the generation of a brittle structure in the area of repair.

The following procedure is recommended:
• The area to be welded must be cleaned to a bright
metal finish.
• Prior to the commencement of welding, the parent
material should be pre-heated to 180-200 ˚C and
the pre-heat temperature is to be maintained	129

during welding.

• The initial layer of weld deposit should be effected by a high nickel electrode such as: Metrode C.I. softlow nickel – N.I.O. 8C.2FE A.W.S. No.A5.15.ENI-CL.

• Subsequent layers of welding may be laid using a less noble electrode such as: Metrode CI special cast Ni Fe – FE.55.NI-1.3.C A.W.S. No. A5.15.ENI.FE.CI.

• Each successive layer of weld must be cleaned and hammered.

• On completion of welding, the built-up zone and surrounding area should be insulation wrapped to permit slow cooling.

Stevin Mk3 UHC chart

130

						y
						la
						c
						d
						ar
				d		h
				d
			n
		d	a
		d				y	t
	n					y
a					la		n
s			m		c		n
			m				i)
		iu					i)
m		iu					HCU
m		d					HCU
	e					ay
						ay	(
					cl		y
				t			y
			f				t
			o				t
		s					ci
		y					ci
		y					pa
er
v
v							aCng ldiHo tealtim Ucal ipy t
							aCng ldiHo tealtim Ucal ipy t

Ultimate Holding Capacity

The prediction lines above represent the equation UHC= A*(W)0.92 with UHC as the Ultimate Holding Capacity in tonnes and A a parameter depending on soil, anchor and anchor line with values between 16 and 31.

Stevin Mk3 size in t

The Stevin Mk3 design line very soft clay represent soils such as very soft clays (mud), and loose and weak silts.

The line is applicable in soil that can be described by an undrained shear strength of 4 kPa at the surface increasing by 1.5 kPa per meter depth or in the equation Su = 4+1.5*z. with Su in kPa and z being the depth in meters below seabed. In very soft soils the optimum fluke/shank angle is typically 50 deg.

The design line sand represents competent soils, such as medium dense sands and stiff to hard clays and is based on a silica sand of medium density. In sand and hard clay the optimal fluke/shank angle is 32°.

The medium clay design line represents soils such as silt and firm to stiff clays. The fluke/shank angle should be set at 32° for optimal performance.

Stevin Mk3 drag and penetration chart

ftc

ryso

gin

dra

)

ers (U et tyciapa mni c

ftcl

nin

ryso

onitratenepdan ginldhoeattimul

rati

131

lay

gdralicap otddealo

onin

hanc

nin

sand

Stevin Mk3 size in t

anchor load

drag

penetration

as % of

% max

as % max

drag

UHC

drag

penetration

Example: loading 70% of ultimate holding capacity corresponds with 48% of maximum drag and 80% of maximum penetration at ultimate holding capacity.

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