ESFR system materials tend to cost more than control mode systems (larger pipe sizes, more expensive sprinkler heads). Also, in most cases an ESFR system will require the installation of a fire pump, which is not always required for a control mode system. sprinkler systems are not required.
Definition of flay. 1 : to strip off the skin or surface of : skin The hunter flayed the rabbit and prepared it for cooking. 2 : to criticize harshly : excoriate He was flayed by the media for his controversial comments.
Spall. Spall are flakes of a material that are broken off a larger solid body and can be produced by a variety of mechanisms, including as a result of projectile impact, corrosion, weathering, cavitation, or excessive rolling pressure. Spalling and spallation both describe the process of surface failure in which spall is shed.