WASHINGTON, July 1 (Reuters) - The U.S. Commerce Department said on Tuesday it has set final duties ranging up to 237 percent on a diesel fuel additive from Germany and nearly 360 percent on the same product from China.

In a separate case, the department set a preliminary duty of nearly 107 percent on stainless steel pipe from one Chinese supplier and 1.47 percent from other Chinese exporters.

"Foreign competitors that undervalue their goods in the United States or receive government subsidies undercut American competitiveness in the global marketplace," Commerce Assistant Secretary David Spooner said in a statement.

The Commerce Department said it determined Chinese exporters were "dumping" sodium nitrite, a diesel fuel additive also used in wastewater treatment and the curing of meat, at 190.74 percent less than normal value.

It set a separate countervailing duty of 169.01 percent to offset Chinese government subsidies for a combined duty of nearly 360 percent.

Because the two Chinese companies -- Qingdao Hengyuan Chemical Co. and Hualong Ammonium Nitrate Co. -- specifically targeted in the case did not cooperate, U.S. officials calculated the duties based on "adverse facts available," the Commerce Department said.

The United States also set an antidumping duty of 237 percent on German supplier BASF AG based on adverse facts available and nearly 151 percent on all other German suppliers, the Commerce Department said.

From 2006 to 2007, imports of sodium nitrite from China increased 56 percent by volume and were valued at an estimated $380,000 in 2007. Imports from Germany increased 15 percent by volume and were valued at an estimated $2 million in 2007.

The U.S. International Trade Commission will vote next month to give final approval to the duties or to strike them down.

In the China steel pipe case, the Commerce Department set a preliminary countervailing duty of 1.47 percent on Winner Stainless Tube Co., which was targeted in the U.S. investigation and provided requested information.

Another targeted company, Froch Enterprise Co <2030.TW>, did not cooperate and received a preliminary countervailing duty of nearly 107 percent, the Commerce Department said.

All other Chinese suppliers received a preliminary countervailing duty of 1.47 percent.

Imports of the stainless steel pipe from China more than doubled in volume from 2005 to 2007 and were valued at $147 million last year.

The Commerce Department will continue its investigation and make a final decision on duty levels in November. The ITC will vote in December on whether or not to allow the stainless steel duties.