The engine was rated for 168 psi using a 2-rivet lap seam
formula, a reference pertaining to original boiler construction.
Had our founders not stood their ground we might still be building Lap seam
Flanging was required to form the various shapes necessary for the riveted lap seams
used in circumferential seams and firebox seams.
Typical uses include sealing around door, window and air conditioner openings; sealing roof and sidewall lap seams
; and weatherproofing interior and exterior sidewall penetrations.
A possible weak link in these systems is the lap seams
, which can be repaired, Hutchinson says.