Sub-sea bolt tensioner – imperial – STU

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Sub-sea bolt tensioner – imperial – STU

Single acting design with mnual piston retraction. Manufactured from high grade alloy steel with added corrosion protection. Extra-long piston stroke on all models, to save valuable diver time subsea. Simple two piece design for easy operation by divers subsea. Visible maximum stroke indicator to warn operator against piston over extension. Safety over stroke device to ptotect operator from injury. Self-energising seals from improved performance and longevity of use at high pressure. Dual quick connect inlet and outlet couplings for easy multiple tensioner connection. Designed to fit most sizes of ASNI and API flanges and some Compact flanges. Interchangeable quick fit pullers, to cover secondary bolt size, for each STU model, are available as accessories for even greater versatility.

Bolt sizes from 1” to 3 1/2” diameterCapacities from 256 to 2483 kNWorking pressure 1500 bar

Product card

Technical specifications

Model number	Quick fit pullers	Bolt thread size	Capacity		Effective area	Stroke	Weight	Tommy bar	Dimensions [mm]
			[kN]	[t]	[cm2]	[mm]	[kg]		A	B	C	D	E	F
STU1-100	QFP1-100	1″-8 UN	256	26.1	17.1	20	3.4	TTB06	82	22	119	119	140	61
STU1-112	QFP1-112	1 1/8″-8 UN	256	26.1	17.1	20	3.4	TTB06	82	22	119	119	140	64
STU2-125	QFP2-125	1 1/4-8 UN	430	43.9	28.7	30	6.0	TTB08	102	30	140	140	164	73
STU2-137	QFP2-137	1 3/8″-8 UN	430	43.9	28.7	30	6.0	TTB08	102	30	140	140	164	75
STU3-150	QFP3-150	1 1/2″-8 UN	553	56.4	36.9	30	7.5	TTB10	114	35	142	142	169	82
STU3-162	QFP3-162	1 5/8″-8 UN	553	56.4	36.9	30	7.5	TTB10	114	35	142	142	169	85
STU4-175	QFP4-175	1 3/4″-8 UN	756	77.1	50.4	30	9.8	TTB10	128	41	151	151	181	94
STU4-187	QFP4-187	1 7/8″-8 UN	756	77.1	50.4	30	9.8	TTB10	128	41	151	151	181	98
STU5-200	QFP5-200	2″-8 UN	1168	119.1	77.9	30	14.5	TTB12	150	48	164	164	202	112
STU5-225	QFP5-225	2 1/4″-8 UN	1168	119.1	77.9	30	14.5	TTB12	150	48	164	164	202	116
STU6-250	QFP6-250	2 1/2″-8 UN	1649	168.1	109.9	30	22.8	TTB14	176	60	183	183	231	136
STU6-275	QFP6-275	2 3/4″-8 UN	1649	168.1	109.9	30	22.8	TTB14	176	60	183	183	231	141
STU7-300	QFP7-300	3″-8 UN	2483	253.2	165.6	30	35.6	TTB16	215	89	215	215	260	162
STU7-325	QFP7-325	3 1/4″-8 UN	2483	253.2	165.6	30	35.6	TTB16	215	89	215	215	260	173
STU7-350	QFP7-350	3 1/2″-8 UN	2483	253.2	165.6	30	35.6	TTB16	215	89	215	215	260	175

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Sub-sea bolt tensioner – imperial – STU