US 11,703,282 B2
Fire tube
Ty Mitchell, Stanley, ND (US); and Ricky Alexander, Minot, ND (US)
Assigned to Trinity Endeavors, LLC, Stanley, ND (US)
Filed by TRINITY ENDEAVORS, LLC, Stanley, ND (US)
Filed on May 4, 2020, as Appl. No. 16/865,933.
Application 16/865,933 is a continuation in part of application No. 16/347,693, granted, now 11,371,694, previously published as PCT/US2017/065157, filed on Dec. 7, 2017.
Claims priority of provisional application 62/437,864, filed on Dec. 22, 2016.
Prior Publication US 2020/0263929 A1, Aug. 20, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. F28D 1/053 (2006.01); F28F 1/02 (2006.01); F28F 1/24 (2006.01)
CPC F28D 1/05366 (2013.01) [F28F 1/022 (2013.01); F28F 1/24 (2013.01); F28F 2210/02 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A fire tube comprising:
a. a first tube section comprised of a first length of hollow tube, a second tube section comprised of a second length of hollow tube, and a third tube section comprised of a third length of hollow tube, wherein the third tube section is situated at a rear end of each of the first and second tube sections and is oriented so that a longitudinal axis of the third tube section is perpendicular to a longitudinal axis of each of the first and second tube sections, wherein the first tube section comprises an open front end that terminates in a first flange, wherein the second tube section comprises an open front end that terminates in a second flange, and wherein the first, second and third tube sections are configured to provide a fluid channel through the open end of the first tube section at the first flange, through the first tube section, through the third tube section, through the second tube section, and out the open end of the second tube section at the second flange; and
b. a tubular and hollow ceramic liner that is situated inside of the first tube section, the ceramic liner comprising one or more separate tubular sections, each of which comprises a front end with a circumferential recess and a rear end with a circumferential protrusion that is configured to fit into the circumferential recess on the front end of an adjacent tubular section.