* Glencore books world's largest tanker for storage
* Cushing storage rates double over past month
* Analyst expect 1 billion barrel excess (Updates with Shell tanker booked for sea storage, comment)
By Devika Krishna Kumar, Ron Bousso and Jonathan Saul
NEW YORK/LONDON, March 17 (Reuters) - Traders are scrambling to secure oil storage tanks on land and at sea to cope with slumping demand resulting from the coronavirus outbreak and a flood of supply from the Saudi-Russia price war.
Rates to store oil at the world's main trading hubs from Japan to South Africa and the United States are surging as millions of spare barrels of oil hit the market daily.
Trading house Glencore this week also chartered one of two of the world's largest oil tankers, capable of carrying 3 million barrels of oil, to store crude at sea.
Royal Dutch Shell has booked a supertanker to store 2 million barrels of oil at sea on expectations that onshore tank space will not be enough to meet the glut, shipping sources said on Wednesday.
Oil players are also contending with record high tanker rates, which have reduced the amount of vessels available for storage at sea.
"Some of the storage contracts looking to be booked are not classic contango plays and are as long as six-month charters to soak up whatever tonnage can be found," one shipping source said.
The crude market is currently trading in what is known as contango, where forward prices are higher than immediate prices. This market structure encourages traders to park barrels in storage in the hopes of selling them for a profit later.
The need for a home for all the surplus crude is breathing new life into the market at Cushing, Oklahoma, the U.S. hub for trading of billions of dollars of crude a day and the town that bills itself "the pipeline crossroads of the world".
Analysts estimate the glut could reach more than 1 billion barrels. Some of the excess will be absorbed by countries snapping up cheap oil for strategic reserves, including India and the United States, but that will only mop up some of the supply.
Asia tops the list of storage locations with 22 million barrels of the 63 million barrels in global floating crude inventory as of March 17, according to oil analytics firm Vortexa.
Six new tankers carrying up to 7 million barrels of crude entered floating storage in China this month, Vortexa said.
Storage rates at Cushing doubled over the past month, and were seen as high as about 50 cents per barrel per month by Friday, two traders familiar with the matter said. Storage for about 540,000 barrels at Plains All American's Cushing tanks for sublease was offered at 50 cents per barrel (cpb) for a term of one year, one source said.
"We average about 2 deals per day. Last week we booked 60 deals," said Ernie Barsamian, founder and CEO of The Tank Tiger, a terminal storage clearing house based in Princeton, New Jersey.
The United States currently has more than 450 million barrels in crude storage, not including strategic reserves. The drop in prices has sparked numerous storage inquiries, particularly at Cushing, the delivery point for benchmark U.S. crude futures.
Nearly 38 million barrels are currently parked there, half Cushing's capacity of about 76 million barrels. The rest of U.S. storage is at smaller tank farms or refining facilities. Inventories at Cushing rose more than 640,000 barrels in the week through Friday, traders said, citing data from market intelligence firm Genscape.
"Everyone and their mother is scrambling to fill up tankage," one trader said.
Once a barometer for the health of U.S. crude supply, Cushing's market clout waned after Washington lifted a ban on U.S. crude exports in late 2015 amid the shale oil boom.
Companies have since spent millions of dollars building infrastructure to facilitate trading and storage at the country's Gulf Coast ports.
But with a wave of Saudi and Russian oil set to hit, U.S. crude exports are expected to plunge by about 1 million barrels per day (bpd) in April and May to about 2.5 million bpd, sources at the biggest merchants in the country said on Friday.
Domestic demand has also plunged, with U.S. gasoline prices plummeting to a record low as travel grinds to a halt due to the pandemic.
Storage at Cushing is held by large midstream companies including Plains All American, Magellan Midstream and Enbridge. Magellan said Monday that it is seeing increased interest for long-term crude storage in Cushing.
Plains did not respond to a request for comment and Enbridge declined to discuss utilisation rates at Cushing, saying it contained customer-specific information.
The spread between front-month U.S. crude for April delivery and those for delivery in 12 months WTCLc1-WTCLc12 widened to the biggest discount in four years last week. The same spread for Brent LCOc1-LCOc12 widened to the biggest discount in five years on Monday.
Commercial crude oil storage in South Korea, one of the largest in Asia, was mostly taken up last month when contango first occurred this year, Asian sources said.
Barsamian said that as the spread widens, the cost for storage will as well.
"The contango will begin to feed on itself and get steeper, unless the Saudis and Russia pull an about face.
Reporting by Devika Krishna Kumar in New York, Ron Bousso, Jonathan Saul and Ahmad Ghaddar in London Additional reporting by Jane Chung in Seoul, Roslan Khasawneh and Florence Tan in Singapore Editing by Richard Pullin/Louise Heavens/Giles Elgood/Jane Merriman