which one of these situations is right?

Question

In winter, tubes of metal filled with water is frozen from cold:
1) the tube will explode because it the metal contracts more than water does.
2) the tube will explode because the metal contracts at low temperatures but water volume becames larger when is frozen.

Also I wanted to know: does water occupy more space when it is frozen or liquid?

does the metal contract at low temperatures?

Answer 1

Metal pipes, filled with water, and the ends sealed.
When frozen, The metal will contract, but the expansion of the ice will be much greater.
This will cause the pipe to split due to very high pressure build up.
This will not be easily noticed until the ice thaws and the water leaks out. (This is what often happens to household pipes in the winter and not noticed for some time).

Water does occupy more space when frozen due to expansion (decrease in density) which continues as it gets colder. (The reason for ice floating in water).

Answer 2

Water ice occupies more space than when it is liquid water. That is the solution to all your questions.