ISO13729 Closed Mooring Chock – Bulwark Mounted

Bulwark mounted ISO13729 closed mooring chock is a special type of anchor hole at a vessel’s bow bulwarks. It is specially used to guide the mooring ropes of large ships. The closed chock is made of high quality cast steel and bolted or welded to the hull. It is used to lead the mooring and towing rope from the ship’s inboard to outboard.

As a large ship mooring chock, it meets the outfitting design by the requirement of Panama Chock. This closed chock is very important mooring equipment. In the process of mooring ship, it bears huge loads. The radius of the chock surface was designed based on the bending ratio of rope through the chock of not less than twelve times the wire rope diameter. Because this type of mooring chock is closed, the cable will not jump out.

As a professional marine equipment supplier, Boomarine provides a wide range size of ISO13729 closed chock to meet the requirements of different projects. Customers can choose the suitable ISO13729 closed chock according to the size of the vessel and the diameter of the pipeline. In addition, we can also provide a series of customized solutions. If you have any needs, please feel free to contact us

The chocks are classified by their installation site as follows:

• Type A – ISO 13729 deck mounted closed chock
• Type B – ISO 13729 bulwark mounted closed chock

Technical Requirements:

• All surfaces of the closed chocks including welding shall be free from any visible flaws or imperfections.
• All surfaces in contact with the ropes shall be free from surface roughness or irregularities likely to cause damage to the ropes by abrasion.
• The closed chocks shall be coated externally with an anti-corrosion protective finish.

Dimensions: (mm)

Dimensions and SWL of Type B – Bulwark-mounted closed chocks

Nominal size (L × H × D)	l1	l2	H1	H2		R	R1	R2		R3	R4	R5
250x200x214	516	441	466	306		100	233	153		108	96	150
300x250x286	638	554	588	410		125	294	205		144	128	180
350x250x333	736	646	636	449		125	318	224.5		168	150	200
400x250x381	834	736	684	450		125	342	225		192	172	250
450x250x381	884	786	684	450		125	342	225		192	172	250
500x250x381	934	836	684	450		125	342	225		192	172	250
400x250x428	882	778	732	515		125	366	257.5		216	194	250
450x250x428	932	828	732	515		125	366	257.5		216	194	250
500x250x428	982	878	732	515		125	366	257.5		216	194	250
500x400x428	982	878	882	665		200	441	332.5		216	194	250
500x250x525A	1078	976	828	551		125	414	275.5		264	240	320
500x400x525A	1.078	978	978	701		200	489	350.6		264	240	320
500x250x525B	1078	976	828	554		125	414	277		264	238	320
500x400x525B	1078	978	978	704		200	489	352		264	238	320
Nominal size (L × H × D)	R6	d1	d2	T	θ	Welding leg lengtha		SWLb		Wire rope diameterc (recommended)	Calculated weightd (kg)
						z1	z2	(kN)	(t)
250x200x214	138	108	80	12	44°	6	5	226	23	18	49
300x250x286	164	144	100	16	44°	8	65	422	43	24	100
350x250x333	182	168	120	18	55°	9	7	549	56	28	141
400x250x381	230	192	120	20	47°	10	8	687	70	32	184
450x250x381	230	192	120	20	47°	10	8	706	72	32	194
500x250x381	230	192	120	20	47°	10	8	765	78	32	202
400x250x428	228	216	120	22	56°	10	9	883	90	36	264
450x250x428	228	216	120	22	56°	10	9	912	93	36	276
500x250x428	228	216	120	22	56°	10	9	932	95	36	288
500x400x428	228	216	120	22	56°	10	9	893	91	36	311
500x250x525A	296	264	120	24	53°	10	95	1148	117	44	379
500x400x525A	296	264	120	24	53°	10	95	1158	118	44	408
500x250x525B	294	264	120	26	53°	10	105	1413	144	44	405
500x400x525B	294	264	120	26	53°	10	105	1383	141	44	442
a: The welding method may be changed based on the same welding volume/strength. b: The SWLs shown in this table are for reference only.These are based on the loadings as mentioned in Annex A. “SWL”may be adjusted depending on the actual loading conditions,and the actual marking shall be as agreed between the user and the manufacturer. c: The wire rope diameter (recommended)is only for reference based on bending ratio of rope through the chock of 12 times. d: The calculated weight is for relerence only. * Dimensions in millimetres

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