LPG Tanker Storm Anchorage

Prince Rupert Harbour Anchorage #9 - Events Before and After January 2020 Storm/Hurricane

We are working to insure assessment of anchorage risk and possible mitigation be completed before a decision is made on Vopak's petrochemical terminal proposal. Since 2014, highly skilled Master Mariners, tug crews, etc. have prevented a grounding incident in the estuary, however there is reason for concern.

Tanker anchorage and loading dock events are shown below along with an unofficial interpretation (also see bulk carrier storm events). Officially confirmed "risk of grounding" events will eventually be reported on Transport Canada's website but this may take a year or so. It appears a Liquid Propane Gas (LPG) Tanker was loaded despite storm warnings, then sent to weather out the storm at anchorage #9 which is a few kilometers off Kitson Island and Flora Bank salmon habitat shown above. A tug stayed with the loaded LPG tanker through the worst of the storm, which may have reached hurricane force, to keep it from dragging. Anchorage #9 appears prone to anchor dragging.


Storm Warning for January 28 was issued on January 26


Storm force winds were forecast as early as January 26th 4:00 AM, before the LPG tanker loaded. The Extended Forecast issued by Environment Canada warned of winds SE 40-50 knots for late in the day Tuesday 28th. (Storm-force wind: Wind speed of 48 to 63 knots inclusive)


 LPG tanker at Anchorage #9 on Jan 27 before the storm and before loading


Here is an image of the track of Umm Laqhab LPG tanker taken at 12:46 AM Jan 27th 2020. It comes into Anchorage #9 where it appears to have anchored, held at anchor for a period and then appears to have dragged about 200 m from its original swinging arc to a second swinging arc where the anchor then seems to have held (there may be alternative explanation for the large movement after anchoring, perhaps a large addition of anchoring chain).  Although the apparent drag does not continue on this occasion, when only gales were forecast, a large drag, even one which stops, is an indication of poor holding ground. The tanker is to scale and is 225 m.


Double Paradise at Anchorage #9Double_Paradise_8.29_pm_Jan_28_anchor_drag_at__9.JPG on Jan 28 while the LPG tanker is visiting the loading dock

Anchorage #9 is prone to anchor dragging. The Double Paradise was there after the Umm Laqhab LPG tanker left to go to Ridley Terminals loading dock. This is an image of the Double Paradise track at anchorage #9 while Umm Laqhb LPG tanker was at Ridley terminals loading dock. The image was taken at 8:29 PM January 28th 2020. The yellow ship image of the Double Paradise is to scale and the 235 m ship appears to have dragged anchor from the original swinging arc. Shortly after this image was taken the Double Paradise left Anchorage #9 making room for the returning LPG tanker.


LPG Tanker heading back to Anchorage #9 from loading dock Jan 28 during the storm


Jan 28 9:30 PM, near the height of the storm, the loaded LPG Tanker (the orange ship icon) is moving out from the loading dock returning to Anchorage #9. It is about to pass the Double Paradise (the yellow ship icon just south of it) which is traveling from Anchorage #9 after apparent difficulties there.


LPG Tanker and Tsimshian Warrior tug at Anchorage #9 Jan 28/29 during storm/hurricane

5--Jan_29th_8.13_am_Tsimshian_Warrior_had_kept_LPG_carrier_from_dragging_all_night.JPGThis image was taken the morning after the storm; it was taken Jan 29 at 8:30 AM. It shows the track of the Um Laqhab back at Anchorage #9 after visiting the loading dock (presumably to load with liquid Propane). It returned to Anchorage #9 accompanied by the tug Tsimshian Warrior to weather out the storm/hurricane. The Tsimshian Warrior is visible as a blue icon directly at the stern of the tanker. Our observations suggest it remained with the loaded tanker throughout the storm and prevented it from dragging. After the storm was over the Umm Laqhab left the harbour directly without returning to the loading dock.


LPG tanker Clermont at Anchorage #9 Feb 20 appears to drag anchor


Less than a month later another LPG tanker anchored at Anchorage #9 appears to have dragged anchor. This image of the Clermont shows the 225 m LPG tanker to scale along with its AIS track where it appears to have dragged over 200 meters from its original anchor arc. It was empty at the time.


Smit Clyde, Smit Tsimshian Warrior and Smit Venta tied up in Prince Rupert harbour after the storm - January 30th morning.