True or False: Provisions must be made to absorb thermal changes by using expansion joints of the bellows type or by using ball or swivel joints on gas piping.

The statement is true because thermal changes in gas piping systems can lead to expansion and contraction due to temperature fluctuations. If not adequately accommodated, these movements can cause undue stress on the piping, potentially leading to leaks or failures.

Using expansion joints, specifically of the bellows type, allows the piping to flex and absorb these changes without transmitting harmful forces along the length of the piping system. Similarly, ball or swivel joints provide the necessary freedom of movement to adjust to thermal expansion and contraction, ensuring the integrity of the gas piping system.

In summary, provisions for accommodating thermal movements are essential in preventing mechanical failures in gas piping systems, making the assertion correct.