To prevent envelope burst: 2" wicking tapes should be applied at 4 places for proper air bleeding between tyre and envelope. Wicking tape should protrude outside the envelope.
Pre-inflate the tyres to between 20-30 psi to avoid distortion of the casing caused by the weight of the lid of the tread bonder.
Maintain the differential pressure of 30 psi between steam pressure and tube air pressure especially at the end of the curing process.