Open Access

Table 3

Lab investigation results for the short-piece and the pig-tail.

Tube no. Sectiona Outer dia average (mm) Thickness average (mm) Bulging (%) PT ratingb Macro/micro structure ratingc

        At lab At site    
RG-42 S 47.08 4.47 11.6 11.4 5 5
  P 43.70 4.91 3.5 4.0 5 5
RI-1 S 43.71 4.64 3.6 4.3 3 3
  P 42.98 5.03 1.8 2.3 2 3
RE-29 S 42.84 4.75 1.5 1–2 2 2
  P 42.42 5.10 0.5 2 1
RC-30 S 45.82 4.41 8.6 6.4 5 5
  P 44.51 4.95 5.5 5.3 5 5
RD-19 S 44.09 4.61 4.5 4.7
  S 43.64 4.64 3.4   4 5
RC-33 S 43.80 4.63 3.8 3–4 3 3
  P 43.12 5.00 2.2 1.9 4 3
RI-2 S 43.09 4.65 2.1 3.6
  S 43.66 4.60 3.4   2 2
RE-35 S 42.91 4.70 1.7 2–3 1 2
  P 42.37 5.13 0.4 1 2
RG-8 S 42.68 4.81 1.1 0–1 1 1
  P 42.35 5.09 0.4 1 1
a

Section: “S” − short piece and “P” − pigtail stub.

b

PT: (1) no crack, (2) little cracks (only at in/out surface), (3) little cracks (in metal also), (4) medium cracks (in metal also), and (5) significant crack (almost penetrating).

c

Macro/micro structure: (1) only surface (in/out) oxidation, (2) creep voids in metal, (3) creep fissures in metal, (4) creep fissures in metal and significant cracks in surface, and (5) cracks all through metal.

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