Manifolds are shaped cross star having curved surfaces inside thereof, and holes are bored in four corners of the manifolds. In mounting a combustor to a casing, oil in the manifolds is transmitted to the holes by way of the curved surfaces. As a result of this, oil is prevented from staying, and coking...http://www.google.com/patents/US6957537?utm_source=gb-gplus-sharePatent US6957537 - Combustor of a gas turbine having a nozzle pipe stand
