- (a) Ductile cast iron components made of material conforming to ASTM F1155 (incorporated by reference, see § 56.01-2) may be used within the service restrictions and pressure-temperature limitations of UCD-3 of Section VIII of the ASME BPVC (incorporated by reference; see § 56.01-2).
(b) Ductile iron castings conforming to ASTM F1155 may be used in hydraulic systems at pressures in excess of 7500 kPa (1000 psi) gage, provided the following:
- (1) The castings receive a ferritizing anneal when the as-cast thickness does not exceed 1 inch;
- (2) Large castings for components, such as hydraulic cylinders, are examined as specified for a casting quality factor of 90 percent in accordance with UG-24 of Section VIII of the ASME BPVC; and
- (3) The castings are not welded, brazed, plugged, or otherwise repaired.
- (c) After machining, ductile iron castings must be hydrostatically tested to twice their maximum allowable working pressure and must show no leaks.
- (d) Ductile iron castings exhibiting less than 12 percent elongation in 50 millimeters (2 inches) when subjected to a tensile test must meet the requirements for cast iron in this part.
[CGD 77-140, 54 FR 40612, Oct. 2, 1989, as amended by CGD 95-027, 61 FR 26001, May 23, 1996; USCG-2000-7790, 65 FR 58460, Sept. 29, 2000; USCG-2003-16630, 73 FR 65183, Oct. 31, 2008; USCG-2020-0634, 89 FR 50153, June 12, 2024]