William Hackett ROV SS C4 QP Chain Block

ROV Operated Manual Chain Hoist

The William Hackett ROV SS C4 QP Chain Hoist is a heavy-duty manual chain hoist designed and manufactured in the UK for subsea lifting applications, especially where remotely operated vehicles (ROVs) are used. It features a four-pawl mechanical engagement system that provides enhanced control, finer adjustment and improved resilience compared to conventional chain blocks. It is proof-load tested and compliant with multiple international standards.

Intended Use of The ROV SS C4 QP

• Designed for underwater and offshore environments, including oil and gas, aquaculture, and general subsea applications.
• Can be operated manually by an ROV using attachments such as fishtail, D-link, torque buckets, or hydraulically.
• A grab frame facilitates easy handling by ROV manipulators.

SS C4 QP Key Technical Characteristics

• Working Load Limits (WLL): Available from 3.2 t up to 50 t.
• Proof Load Testing: 1.5× WLL for 3.2 t - 10 t; 1.25× WLL for 15t and 20t.
• Safety Factor: 4:1.
• Temperature Range: -20°C to +120°C.
• Standards Compliance: Meets BS EN13157, ASME B30.16, AS1418.2, SANS 1594, and NORSOK R-002.
• Hyperbaric Testing: Qualified for subsea operation to 3,000 m water depth

Design and Construction Features

• Quad Pawl Engagement: Four pawls engaging the ratchet gear in an offset pattern for finer tensioning and greater safety.
• Corrosion Protection: Special marine-grade paint and corrosion-protected components for subsea durability; stainless steel fixings throughout.
• Hyperbaric Capability: Tested to 3,000 m water depth for subsea use.
• Safety Hooks: Heavy-duty hooks with latches, overload indicators, and traceability markings.
• Optional Accessories: Overload limiters, Hot Stab, Fishtail, D-Link, and Torque Buckets, as well as bespoke fittings such as other ROV lifting equipment, including ROV Shank Hooks, Shackles, and Sling Hooks.

Operational Features

• Supports fleeting (side pull) and cross-hauling up to 45° without reducing WLL.
• Load chain options include corrosion-protected Grade 8 as standard and optional calibrated 316L stainless steel.
• Designed for underwater remote operation by means of an ROV (remote operated vehicle).

Support and Documentation

Spare parts, training on safe use and inspection, and technical data sheets/user guides are available.

Materials and Corrosion Protection

• Marine-grade protective coating system suitable for subsea environments
• Stainless steel fasteners throughout
• Load Chain (standard): Grade T (Grade 8)
• Optional Load Chain: Calibrated 316L stainless steel

William Hackett SS C4 QP ROV Chain Hoist - Metric Specifications

Product Code	WLL	A (mm)	B (mm)	C (mm)	D (mm)	E (mm)	F (mm)	G (mm)	Load Chain (mm)	No. of Falls	Mass in air at 3m HOL (kg)	Extra Mass per m HOL (kg)
022.R.300.F1.P	3.2 tonnes	507	516	292	520	37.5	40	49	10 x 30	1	39.0	2.2
022.R.500.F1.P	5 tonne	507	516	292	600	43	44	54.5	10 x 30	2	46.0	4.4
022.R.750.F1.P	7.5 tonnes	507	512	292	740	53	60	85	10 x 30	3	66.0	6.6
022.R.1000.F1.P	10 tonne	507	516	292	760	53	83	89	10 x 30	4	77.0	8.8
022.R.1500.F1.P	15 tonne	537	516	292	1000	80	108	-	10 x 30	6	124.0	13.2
022.R.2000.F1.P	20 tonne	552	600	292	1150	80	140	-	10 x 30	8	165.0	17.6
022.R.3000.F1.P	30 tonne	800	600	292	1150	-	-	-	10 x 30	12	530.0	27.9
022.R.5000.F1.P	50 tonne	840	600	292	2000	-	-	-	10 x 30	20	765.0	45.2

William Hackett SS C4 QP ROV Chain Hoist - Imperial Specifications

Product Code	WLL	A (in)	B (in)	C (in)	D (in)	E (in)	F (in)	G (in)	Load Chain (mm)	No. of Falls	Mass in air at 10ft HOL (lbs)	Extra Mass per m HOL (lbs)
022.R.300.F1.P	3.2 Tons	19.96	20.31	11.50	20.47	1.48	1.57	1.93	10 x 30	1	85.98	4.85
022.R.500.F1.P	5 Ton	19.96	20.31	11.50	23.62	1.69	1.73	2.15	10 x 30	2	101.41	9.70
022.R.750.F1.P	7.5 Tons	19.96	20.16	11.50	29.13	2.09	2.36	3.35	10 x 30	3	145.51	14.55
022.R.1000.F1.P	10 Ton	19.96	20.31	11.50	29.92	2.09	3.27	3.50	10 x 30	4	169.76	19.40
022.R.1500.F1.P	15 Ton	21.14	20.31	11.50	39.37	3.15	4.25	-	10 x 30	6	273.37	29.10
022.R.2000.F1.P	20 Ton	21.73	23.62	11.50	45.28	3.15	5.51	-	10 x 30	8	363.76	38.80
022.R.3000.F1.P	30 Ton	31.49	23.62	11.50	45.28	-	-	-	10 x 30	12	1168.45	61.51
022.R.5000.F1.P	50 Ton	33.07	23.62	11.50	78.74	-	-	-	10 x 30	20	1686.54	99.65