DUBAI, UNITED ARAB EMIRATES, AUG. 23 -- Kuwait is preparing to charter two American tankers to add to the fleet of vessels coming under the protection of the growing U.S. Navy force in the Persian Gulf, Rep. Steven J. Solarz (D-N.Y.) said today.

Solarz, who is on a tour of the troubled Persian Gulf region as chairman of the House Foreign Affairs subcommittee on Near Eastern and South Asian affairs, also said tonight that Britain is actively considering joining the United States in placing Kuwaiti ships under its colors. Two Kuwaiti tankers may be placed under the British flag, he said.

The two U.S. tankers that Kuwait is about to charter would bring to 13 the number of ships that will, once in service, receive Navy protection. Eleven Kuwaiti tankers are being reflagged under U.S. colors.

The chartering of tankers to Kuwait will add to a U.S. naval commitment that could last for "a prolonged period of time," Solarz said in a telephone interview from Abu Dhabi.

"There are real risks to the men in the fleet," he said. "The president should invoke the War Powers Act. The law requires it. It is designed for situations like that. If he did, Congress would approve it by a large margin. It would broaden the support in the country" for an extended U.S. military operation in the gulf region.

A group of 100 Democratic members of Congress has asked a federal court in Washington to order President Reagan to invoke the War Powers Resolution. The White House consistently has insisted that invoking the act is unnecessary in the reflagging operation.

Under the War Powers Resolution, the president is required to notify Congress when he has introduced U.S. forces into combat or situations where "imminent involvement in hostilities" is likely. The law requires the president to terminate such operations within 60 days of reporting to Congress unless it declares war, authorizes the operation or extends the 60-day rule.

U.S. naval vessels, now assisted by mine-sweeping helicopters, have escorted seven ships through the gulf to Kuwait, and a convoy of four loaded vessels is currently on its journey out of the gulf.

The U.S.-escorted ships reportedly reached the vicinity of Bahrain this afternoon, placing them beyond the danger area where the supertanker Bridgeton was damaged by a mine on the Navy-escort operation's maiden voyage.

As the convoy traffic continued in the gulf, Iraq kept up its air war against targets in Iran, hitting the petrochemical complex at Bandar Khomeini for the second straight day, according to an Iraqi military communique.

Iraq began hitting Iranian economic targets more than a week ago after a period of relative calm in the Iran-Iraq war, which is approaching its eighth year. Mines found in the gulf, including those that have been hit by five vessels in the past three months, are widely believed to have been laid by Iran, which has alternatively denied and acknowledged seeding them.

Iranian naval vessels also have fired on at least two ships in recent days in a revival of their stop-and-search policy involving ships that may be bound for Kuwait with war materiel ultimately destined for Iraq.

It is in response to this naval war, which has been waged in various phases for several years, that Britain has maintained a small fleet of warships in the Persian Gulf to accompany British commercial vessels on the often perilous journey through the Strait of Hormuz and into the gulf as far as Bahrain. More than 300 ships have been hit or trapped as the result of the gulf war.

Britain before now reportedly has been reluctant to join the United States in the reflagging operation, but it is sending mine sweepers to join its gulf force to protect British ships. Efforts to reach British officials here for comment on the reported change of position were unsuccessful, but Solarz said British diplomats have confirmed that reflagging is under active consideration.

{In Washington, a British Embassy official said Britain has not changed what he termed its previously stated policy on the reflagging of foreign commercial ships. "Those companies that meet the requirements set up in the U.K." can be reflagged and "are likely to get protection (from the Royal Navy) currently available" in the gulf, he said. But he said he did not know "whether any new ships will come onto the register."}

Solarz said the active U.S. naval presence in the gulf has "averted the downward slide of American credibility in the region. It is warmly welcomed and strongly supported" by states on the Arabian Peninsula.

"If we were to withdraw now, it would have serious long-term consequences," he said.

He said he "has been impressed by the degree of cooperation" with the new U.S. policy displayed by countries in the gulf, especially Saudi Arabia and Kuwait.

{Saudi Arabia denied Sunday that it was granting facilities on its territory to U.S. planes engaged in military operations in the Persian Gulf, Deutsche Presse-Agentur reported.

{U.S. officials and diplomatic sources said Friday that the Saudis quietly have agreed to provide expanded landing rights and refueling support for U.S. aircraft and that Kuwait has offered refueling aid for U.S. planes involved in the Navy escort of reflagged Kuwaiti tankers.

{In Washington, Richard W. Murphy, assistant secretary of state for Mideast affairs, said, "None of the states in the region have discussed or want to discuss the nature of their cooperation with the United States because of the threat of intimidation from Iran.

{"We are satisfied with the level of cooperation. It's growing."

{Murphy was asked on NBC's "Meet the Press" if Saudi Arabia and other gulf states were cooperating with the United States behind the scenes on the understanding that if such cooperation was discussed publicly they would deny it.

{Murphy called that "a sound" conclusion, adding that it was U.S. policy not to discuss specific cooperative arrangements it has in the region.

{In New York, Iran's deputy foreign minister, Mohammed Jawad Larijani called the reported cooperation of Saudi Arabia and Kuwait "a very dangerous step" that "if it is materialized, definitely expands the circle of the conflict. It is not in the benefit of the region." He spoke on a "Meet the Press" segment not shown in Washington.}

The wreckage of a U.S. Navy helicopter that crashed last month was raised today and brought ashore to Bahrain, The Associated Press reported shipping executives as saying.

Iran's official IRNA news agency erroneously reported that a U.S. helicopter had crashed yesterday and the bodies of five U.S. reporters and photographers had been recovered by the Iranian Navy. An Iranian military spokesman denied the IRNA report today. Shipping sources in Bahrain speculated that Iranians had overheard radio conversations during salvage operations and misunderstood what was being said, AP reported.