I don't know about hydrogen specifically, but the usual way that gasses such as propane are handled in the field is to store them in liquid form in pressurized container and then allow them to vaporize off the top and come out a valve, then handle them in gaseous form in the hoses. The regulator for a typical propane system is set around 10 psi. This means that the complex and dangerous work of handling the pressurized gas can be done in a specialized facility. The problem with trying to keep gasses in liquid state while they're in transmission lines is that the lines must either be able to handle very high pressures, or they must be insulated and/or refrigerated so as to keep the gas at a very low temperature (Boyle's Law, again). None of this is insurmountable, but the additional complexity of the refrigeration system and/or the safety issues related to handling high-pressure gasses--and most especially highly flammable gasses--means that it's just not worth it in most cases.
Why don't you spend some time researching hydrogen fuel cells being developed for cars? Ask yourself why hydrogen cars don't just use a tank of liquid H2, plumbed through high-presusre lines. Why is it that automakers have put so much work into designing hydrogen fuel cells instead?