OBS SURVEYS, BRAZIL, 2018-19 Seismic data acquisition using RV "Alpha-Crucis", University of São Paulo, Brazil				UNIVERSITY OF BERGEN Department of Earth Science Allé gt. 41, N-5007 Bergen, Norway

0.1	DRAFT - request for comments	-	26 March, 2017	OM	OM	-
VER.	STATUS	CHANGE	DATE	BY	CKD	APPD

INTRODUCTION

A geophysical data acquisition program is considered in Brazilean waters, using R/V "Alpha-Crucis", as a collaboration between these parties:

Universidade do Estado do Rio de Janeiro (UERJ) [Rio de Janeiro State University], Geologia
University of São Paolo:
Department of Earth Science at University of Bergen, Norway

This web page describes technical details in the seismic instrumentation systems.

ABOUT RV "ALPHA-CRUCIS"

Click to see informal presentation of RV Alpha-Crucis.

Click to see informal RV "Alpha-Crucis" YouTube presentation.

Named after the star that represents Sao Paulo on the Brazilian flag
".... Luiz Nonnato, engineer of the Instrumentation Laboratory of the Oceanographic Institute and responsible for the design of the vessel's new equipment." Quote from this article (translated into English).
Built: 1973 (refit 2012)
Commisioned: 2012
Length: 64 m
Beam: 11 m
Draft (max): 4.05 m
Gross tonnage: 1890 Ton
Crew: 19
Scientist: 21
Endurance: 70 days
Wikipedia article
On "Marine Traffic", vessel tracking page:
- Current position, track map
- IMO: 7319008
- MMSI: 710000435
- Call Sign: PQ3082

GEOPHYSICAL INSTRUMENTATION

List of required instrument systems

Item no.	Name	Status	Description / Setup	Backup required? [TBD = To Be Determined]
1	Navigation system / Survey Computer		TO BE DETERMINED. LIST OF SPECIFICATIONS MUST BE MADE. CANDIDATES FOR EVALUATION: EIVA NaviPac Triggerfish (Integrated Navigation System) Diff GPS: To be determined	TBD
2	Auto pilot (and / or: Helmsman display)		TO BE DETERMINED. CANDIDATES FOR EVALUATION: Simrad AP80	TBD
3	Airgun control system		TO BE DETERMINED. CANDIDATES FOR EVALUATION: Teledyne RTS Hotshot Gun Controller - available for rental at TTS Information from manufacturer Teledyne: "The Hotshot 4 can be configured with the optional RTS GPSSYNC hardware that will give the unit GPS based time. In this operational configuration, the GPS time is used to time stamp the shot points that are recorded in the shot log down to the mS, the time recorded is the trigger time. This log file is recorded by the Hotshot software for later use."	TBD
4	Mini-streamer		Manufacturer: Geometrics Model: MicroEel Type: 8-channel	TBD
5	Recording for Mini-streamer		Manufactirer: Geometrics Model: GEODE Sample interval: 2 ms Recording time: To be determined (TBD) Data format: SEG-Y Filter settings: Only anti-alias filter (automatically adapted to sample rate).	TBD
6	Gravitymeter		Manufacturer, electronics: ZLS Information	TBD
7	Magnetometer		Manufacturer:Geometrics Model: G-882 Information, specifications	TBD
8	Time stamping equipment (if required - Gun Controller might include such feature)		Manufacturer: Ashtech Model: ProFlex Lite DG14 Information, specifications	TBD
9	Airguns		4 ea, Bolt model 1500, each 1200 inch³ , in total 4800 inch³ Air pressure, firing moment: 138 Bar = 2000 psi Source depth: To be determined	TBD

Rental companies

MISC

Vessel navigation, steering

Olex: Marine charting and navigation
Sperry Marine, Autopilot example: NAVIPILOT 4000 Marine Autopilot
SRH Marine: Autopilot and Steering
SIMRAD AP80 Autopilot

Instrumentation

http://www.kum-kiel.de/en/home/

Diesel fuel tank for compressor

A compressor with diesel motor would require fuel tank of, say, 2 m³, to keep it running for 24 hours, before resupply would be necessary. Such fuel tanks can be of type shown below. They could be placed upon container that houses compressor - provided vessel structural strength and stability concerns are adressed first.

Seismic compressor, containerized, with diesel drive: Search for "clean diesel fuel lines dnv"
8 feet Fuel containers:
- https://www.hooverferguson.com/products/containers/offshore-chemical-tanks/aviation-helifuel.html
- https://www.hooverferguson.com/products/ccus/offshore-containers/mini.html
- Search for: "fuel container 8' offshore"

Example 4000 liter Heli-fuel tank, manufactured by Hoover Ferguson	Example 2900 liter Heli-fuel tank, manufactured by Hoover Ferguson
DNV certified tanks from MODEX: Model "TC20 2000L Vertical Chemical" could be considered ..... Quote: "MODEX is a leading manufacturer and provider of DNV certified CCU’s [= Cargo Carrying Units], cabins and well service equipments for offshore oil & gas operations."