Interep CustomFlex Dynamic Insulation on a hot metal bellows. Your average metal bellows on an Alstom HRSG sheds around 5500BTUs of heat per hour (in a hot climate!) that number is probably closer to 7500 in the winter. That equates to about $1-2 of lost heat per hour, on just a single expansion joint. - INTEREP Inc.

Interep CustomFlex Dynamic Insulation on a hot metal bellows. Your average metal bellows on an Alstom HRSG sheds around 5500BTUs of heat per hour (in a hot climate!) that number is probably closer to 7500 in the winter. That equates to about $1-2 of lost heat per hour, on just a single expansion joint.

Interep CustomFlex Dynamic Insulation on a hot metal bellows. Your average metal bellows on an Alstom HRSG sheds around 5500BTUs of heat per hour (in a hot climate!) that number is probably closer to 7500 in the winter. That equates to about $1-2 of lost heat per hour, on just a single expansion joint.