Push core policies

ROV pilot Bryan Shaefer

ROV Pilot Bryan Touryan-Schaefer checks that the full complement of push cores are loaded and ready to go for the next dive.

  • Scientists are required to supply two rubber stoppers for each push core to replace both the top and bottom stoppers. The original rubber stoppers supplied by DMO need to be returned to the Marine Operations Technicians (MOTs) promptly so they can be reused. Rubber stoppers (size 13.5 cm) are available from Fisher Scientific.
  • When the ROV has been recovered and is safely back on deck, the scientist should remove the top and bottom stoppers (handle and quiver stoppers) and replace them with the new stoppers supplied by the scientist.
  • The handles and quiver stoppers should then be placed back into the quiver tubes so that the MOTs can prepare the pushcores for the next user.
  • A supply of push core spare parts and emergency supplies of solid stoppers will continue to be stocked on the R/V Rachel Carson (science van) and R/V Western Flyer (moon pool).
  • Please “mark” or “tag” any defective push cores so the MOTs know what needs to be repaired. (See marking and tagging supplies in the spares box.)
  • Used push core tubes should be returned to the MOT shop promptly so the tubes can be re-used. The MOTs will maintain a small inventory of tubes, and will have new tubes made as needed.

Please direct any further questions about push cores to a Marine Operations technician.

Push core description

Push cores are made of a removable clear poly carbonate tube that is used to collect sediment samples. Each tube is 7.5 cm in diameter and 30 cm long, and can collect up to 20 cm of sediment per tube.

The clear tube is attached to a handle assembly which includes:

  • A rubber cylindrical handle that is grasped by the ROV manipulator.
  • A plastic retaining ring with a stainless steel hose clamp that attaches the handle assembly to the plastic push core tube. Just below the rubber handle is a device that allows water to escape as the core is inserted into the sediment, and can then be closed to help retain the sediment sample as the core is removed.
  • “Stab” pins further ensure the closure of the vent holes. (See illustrations below of “stab” open and closed.)

Stab open


Stab closed

At Sea

Research Vessel Western Flyer
2016 departure/arrival times
Research Vessel Rachel Carson
Research Vessel Paragon
Emergencies and contacts
Onboard cruise log
Policies and operating guidelines
Cruise planning
Marine operations policies
Departure/arrival times
Early departure
Elevator payload limits
Hazardous materials
Homer beacon policies
Lab use and chemical safety
NILSPIN ™ oceanographic ropes
Push core policies and description
RHIB operations
Rigging policy
Science party size
Cruise planning
R/V Western Flyer cruise planning
Checklist of Supplies
Cruises outside home port
Data and video: formats and specifics
Departure/arrival times
early departure
Hazardous materials
Precruises and postcruises
RHIB operations
ROV dive time definitions
ROV users checklist
Safety Management System
Science party guidelines
Scuba diving
Ship to shore communications
R/V Rachel Carson cruise planning
R/V Paragon cruise planning
Marine operations policies
Remotely operated vehicles
ROV Ventana
ROV Doc Ricketts
Mini remotely operated vehicle (ROV)
Autonomous underwater vehicles
Gulper autonomous underwater vehicle
Seafloor mapping AUV
Long-range autonomous underwater vehicle Tethys
Investigations of imaging for midwater autonomous platforms
Benthic Rover
Autonomous surface vehicles
Wave Glider
Wave Glider-based communications hotspot
2015 Expeditions
2014 Expeditions
2013 Expeditions
2012 Expeditions
Cabled observatory
About MARS
MARS contacts
MARS science experiments
How to connect to MARS
MARS contacts
How to interface
MARS site description
MARS instrument deployment
MARS biology
MARS technology
MARS connector wiring
MARS node description
More ocean observatory resources
Local notice to mariners
Mooring data
Research tools
Administration & planning
Cruise planning
Marine operations technicians
Marine operations policies