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Each successful hit roll made with this weapon inflicts a mortal wound instead of the normal damage. If any
hit roll made in a given phase results in a score or a ‘1’,
then the firing unit suffers one mortal wound. This effect can only occur once per phase regardless of how many
results of ‘1’ are rolled.

If a Chaos Decimator fires both soulburner petards during the shooting phase and rolls 1 for both weapons, do they take 1 or 2 mortal wounds.

I understand it to be that it takes two mortal wounds as each weapon rolled a separate 1 for the hit roll.

I am told that its special rule over rides this and the model only takes 1 mortal wound.

I am finding it very hard to find clarification for this.

I'd say only 1 can be inflicted, as it states the "effect can only occur once per phase", rather than "this effect can only happen once for each weapon".

The way it's written you suffer one MW for each weapon if the result of the hit roll is 1. Note that you can work around this if you get +1 to hit rolls. You would fail to wound if you roll a natural 1, but the result would be 2. So no MW for you. Just like plasma can't blow up if you get +1 to hit rolls.

It all depends on whether you interpret "This effect can only occur once per phase regardless of how many results of ‘1’ are rolled." as being global or local to the weapon being fired.

In short, both answers are correct because GW can't write rules despite 40 years of experience.

True, after giving it some more thought, its ambiguous. It could be only one MW per phase total, or one for each weapon per phase. It's FW, so don't expect a fix anytime soon.