Does anybody has an extract from OM or similar publication specifying under which conditions rwy width can be reduced to 30m foe B737?
Be a tad careful. Normally, most States will adopt the ICAO practices. If not the usual variation can be published. Generally, an individual State will determine under what conditions concessions may be granted .. and such conditions may vary from State to State .. ie, if you get access to OM data from operator A .. it may not have much relevance to your operation around the other side of the globe.