Lightest, most economical connection. Uniform barrel with nut relief.
QPV connections
Insert Lip
Lip welds into the shell. Easier weld inspection and good toughness at the opening. Common for replacements and cyclic service.
Suffix Q, e.g. I3Q
Pressure vessel connections
Pressure vessel connections specifications
- Family:
- LWN · HB · I-1 · I-2 · I-3 · E · SB (Q = insert lip)
- Sizes:
- NPS ½–24 (Class 150–1500); NPS ½–12 (Class 2500)
- Large-diameter:
- ASME B16.47 Series A & B, NPS 26–60, Class 75–900
- Also:
- Studding outlets · butt-weld stub ends · blind flanges
- Codes:
- ASME VIII Div 1, B16.5 (standard); VIII Div 2, I, III, B31.1, B31.7 (on request)
- Standard grade:
- SA-105
- Other grades:
- SA-182 F11/F22/F91/F304/F316/F51…, SA-350 LF2/LF3, SA-266, SA-541, SA-765, A694, B564
- Special chemistry:
- HF alkylation (HF-N), API 934-A/C/E Cr-Mo, low J/X factor
- Heat treat:
- Normalized above Class 300
- Facing:
- RF (std), FF, RTJ
- Lengths:
- 9 / 12 / 16 in standard; any length on request
Same family
More connections
Thicker barrel and automatic nut stop. Sch 80 bore through 12 in.
Three steps of added reinforcement between HB and E.
Barrel OD equals flange OD. Most reinforcement of the standard family.
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