By Jeslyn Lerh SINGAPORE (Reuters) – Shippers and trading firms are facing longer waits and higher prices for low-sulphur fuel deliveries at Singapore, the world’s top bunker hub, as refuelling demand rises due to ship diversions from Red Sea tensions, industry sources told Reuters. Ships are topping up more at hubs such as Singapore where fuel is more competitively priced compared to farther-flung ports, after a growing number of vessels re-route around Africa to avoid potential attacks. As a result, availability of slots for bunker barges, which supply marine fuel to ships, has tightened for…