* Shares hit 52-week low, down as much as 8.9 percent
* Reports operating loss in casing and tubing unit
* Short term debt more than twice cash balance
* Bonds hammered by weakening credit metrics
(Adds context, bonds, graphic)
HONG KONG, April 1 (Reuters) - Shares of China's Shandong Molong Petroleum Machinery Co Ltd
Shandong supplies petroleum machinery parts and pumping units to oil fields run by China's biggest players in the industry, earning 90 percent of revenue from supplying casing and tubing.
Shandong did not elaborate on why the division saw red late on Monday when it reported a full-year net loss of 175.7 million yuan ($28.26 million), compared with a profit of 134.3 million yuan a year earlier. Revenue fell 23 percent to 2.27 billion yuan.
Shandong suspended trading of its shares in Hong Kong on Monday pending the report, which it postponed until the evening. On resuming trade early Tuesday, its shares fell as much as 8.9 percent, compared with a 0.7 percent gain in the broader market
Shandong's customers include China's largest oil and gas producer Petrochina
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GRAPHIC: Shandong shares extend fall after 2013 loss:
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DEBT
As well as reporting a loss, Shandong said its total debt rose marginally to 2.3 billion yuan, while Thomson Reuters data showed Shandong's short-term debt reached more than two times its cash on hand. Yields on Shandong bonds have surged.
Shangdong's 5.2 percent coupon bonds due 2016
The company is due to make a coupon payment on its 500 million yuan 2016 bond later this year, which it has previously said it can meet.
"Our company is capable of paying the interest now, since it is not due until July," board secretary Zhao Hongfeng told Reuters earlier this month.
($1 = 6.2180 Chinese Yuan)
(Reporting by Umesh Desai and Anne Marie Roantree; Editing by Paul Tait)
((annemarie.roantree@thomsonreuters.com)(+852 97387151)(Reuters Messaging: annemarie.roantree.thomsonreuters.com@reuters.net))
Keywords: SHANDONG MOLONG STOCKS/