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MARINE CHOCK

ISO 13729-2012 Closed Chock

Description:

The closed chock is a type of ship’s mooring and towing fitting installed on the ship side to lead the mooring and towing rope from the ship’s inboard to outboard. The closed chocks are normally adopted for ships which use wire ropes. The radius of chock surface was designed based on the bending ratios of rope through the chock, it will not less than twelve times of the wire rope diameter.

Classification:

The closed chock can be classified by it’s installation site as follows:

-- Type A -Deck mounted closed chock;

-- Type B -Bulwark mounted closed chock.

Parameters of ISO 13729-2012 Type A Closed Chock:

Nominal size LHD	l1	l2	l3	l4	H1	H2	H3	R	R1	R2	R3	R4	R5	R6	d1	T	Calculated weight (kg)
250200214	488	453	76	265	427	368	108	100	219	160	108	86	150	128	108	22	73
300250286	614	565	89	330	551	481	144	125	282	212	144	118	180	154	144	26	142
350250333	716	660	114	403	601	525	168	125	308	232	168	138	200	170	168	30	222
400250381	820	754	139	475	652	553	192	125	335	236	192	156	250	214	192	36	310
450250381	870	804	164	524	652	553	192	125	335	236	192	156	250	214	192	36	322
500250381	920	854	189	574	652	553	192	125	335	236	192	156	250	214	192	36	337
400250428	870	796	139	500	701	609	216	125	360	268	216	178	250	212	216	38	434
450250428	920	846	164	550	701	609	216	125	360	268	216	178	250	212	216	38	452
500250428	970	896	189	600	701	609	216	125	360	268	216	178	250	212	216	38	472
500400428	970	896	176	600	851	759	216	200	435	343	216	178	250	212	216	38	528
500250525A	1068	1000	190	652	798	675	264	125	409	286	264	224	320	280	264	40	657
500400525A	1068	1000	193	652	948	825	264	200	484	361	264	224	320	280	264	40	724
500250525B	1074	1000	176	652	801	680	264	125	412	291	264	218	320	274	264	46	753
500400525B	1074	1000	179	652	951	830	264	200	487	366	264	218	320	274	264	46	825

Parameters of ISO 13729-2012 Type B Closed Chock:

Nominal size LHD	l1	l2	H1	H2	R	R1	R2	R3	R4	R5	R6	d1	d2	T	θ	Calculated Weight(kg)
250×200×214	516	441	466	306	100	233	153	108	96	150	138	108	80	12	44°	49
300×250×286	638	554	588	410	125	294	205	144	128	180	164	144	100	16	44°	100
350×250×333	736	646	636	449	125	318	224.5	168	150	200	182	168	120	18	55°	141
400×250×381	834	736	684	450	125	342	225	192	172	250	230	192	120	20	47°	184
450×250×381	884	786	684	450	125	342	225	192	172	250	230	192	120	20	47°	194
500×250×381	934	836	684	450	125	342	225	192	172	250	230	192	120	20	47°	202
400×250×428	882	778	732	515	125	366	257.5	216	194	250	228	216	120	22	56°	264
450×250×428	932	828	732	515	125	366	257.5	216	194	250	228	216	120	22	56°	276
500×250×428	982	878	732	515	125	366	257.5	216	194	250	228	216	120	22	56°	288
500×400×428	982	878	882	665	200	441	332.5	216	194	250	228	216	120	22	56°	311
500×250×525A	1078	976	828	551	125	414	275.5	264	240	320	296	264	120	24	53°	379
500×400×525A	1078	978	978	701	200	489	350.6	264	240	320	296	264	120	24	53°	408
500×250×525B	1078	976	828	554	125	414	277	264	238	320	294	264	120	26	53°	405
500×400×525B	1078	978	978	704	200	489	352	264	238	320	294	264	120	26	53°	442