Section 56.15-5 - Fluid-conditioner fittings(a) Fluid-conditioner fittings meeting the standards of this part and certified in accordance with subpart 50.25 of this subchapter are acceptable for use in piping systems.(b) Fluid-conditioner fittings made in accordance with the applicable standards listed in table 2 to § 56.60-1 and of materials complying with subpart 56.60 of this part, may be used within the material, size, fluid, pressure, and temperature limitations of those standards and within any further limitations specified in this subchapter.(c) The maximum allowable working pressure may be determined in accordance with § 56.15-1(c) .(d) If nonstandard fluid-conditioner fittings are welded, they must be welded in accordance with subpart 56.70 of this part and part 57 of this subchapter or by other processes specifically approved by the Marine Safety Center.(e) Heat exchangers having headers and tubes, and brazed boiler steam air heaters, are not considered fluid-conditioner fittings and must meet the requirements in part 54 of this subchapter regardless of size. For brazed boiler steam air heaters, see also § 56.30-30(b)(1)t. CGD 77-140, 54 FR 40602, Oct. 2, 1989, as amended by CGD 83-043, 60 FR 24772, May 10, 1995; USCG-2003-16630, 73 FR 65176, Oct. 31, 2008