Seal 428 Specifications - Sercel
Seal 428 Specifications - Sercel
Seal 428 Specifications - Sercel
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SENTINEL ® SOLID ACQUISITION SECTIONS (SSAS)<br />
Sentinel ® Sentinel ® RD<br />
Field Digitalization Unit (FDU2F)<br />
Unit arrangement one for two channels, 2 adjacent one for two channels, 2 adjacent<br />
Unit spacing (Typical) 50 m 50 m<br />
Functions A/D conversion, data digitizing, tests A/D conversion, data digitizing, tests<br />
Hydrophone <strong>Specifications</strong><br />
Standard model <strong>Sercel</strong> Flexible Hydrophone <strong>Sercel</strong> Flexible Hydrophone<br />
Nominal capacitance 32,5 nF ± 10% @ 20°C 32,5 nF ± 10% @ 20°C<br />
Nominal sensitivity -193 dB re 1 V/µPa -193 dB re 1 V/µPa<br />
± 1,5 dB (22,4 V/bar) ± 1,5 dB (22,4 V/bar)<br />
@ 20°C @ 20°C<br />
Hydrophones array arrangement (1)<br />
(Typical) 12.5 m (one overlapping hydrophone) 12.5 m (one overlapping hydrophone)<br />
Hydrophones per group 8 8<br />
Group capacitance 260 nF ± 10% @ 20°C 260 nF ± 10%@ 20°C<br />
Group sensitivy (electronics included) -194.1 dB re 1 V/µPa -194.1 dB re 1 V/µPa<br />
± 1 dB (19.7 V/bar) ± 1 dB (19.7 V/bar)<br />
@ 20°C @ 20°C<br />
Maximum length without power line nor telemetry<br />
line redundancy and with a 950 m long lead in 15750 m / 1260 ch 15750 m / 1260 ch<br />
Physical specifications<br />
Nominal section length 150 m 150 m<br />
Cable diameter 59.5 mm (2.34 in) hydrophones included 55 mm (2.17 in) hydrophones included<br />
Stress members Twaron/Vectran Twaron/Vectran<br />
Groups per section (1) 12 12<br />
Typical group spacing (1) 12.5 m 12.5 m<br />
Jacket Polyurethane, 3.5 mm wall Polyurethane, 3.5 mm wall<br />
(5.2 mm over hydrophones) (5.2 mm over hydrophones)<br />
Environmental specifications<br />
Operating temperature -10° to +40°C -10° to +40°C<br />
Storage temperature -35° to +50°C -35° to +50°C<br />
Maximum operating depth (2) 50 m 50 m<br />
Maximum survival depth (3) 250 m 250 m<br />
Filled section weight in air 419 kg ± 10 kg 362 kg ± 8 kg<br />
Mechanical specifications (4)<br />
Cable UTS > 170 kN > 170 kN<br />
Terminated UTS > 115 kN > 115 kN<br />
Operating tension up to 58 kN up to 58 kN<br />
Streamer length @ 5 knots up to 15.75 km up to 15.75 km<br />
Ballast fluid capacity N/A N/A<br />
Drag of a 12 km Streamer 39 kN @ 5 knots 36 kN @ 5 knots<br />
Maximum Retrieval Tension < 26 kN < 26 kN<br />
(1) Other configurarions available on request<br />
(2) 22 m for depth restricted versions<br />
(3) 150 m for depth restricted versions<br />
(4) See operational model for more details
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