Tolerance for base plate
Tolerance for base plate
(OP)
Hi Guys
Can anyone direct me to the tolerance for the following in pressure vessels built to ASME Sec VIII Div 2:
1) Vertical vessel base ring tilt & levelness
2) Horizontal vessel skirt base plate tilt and levelness
Is there any reference in sec VIII?
Thanks in advance
Sree
Can anyone direct me to the tolerance for the following in pressure vessels built to ASME Sec VIII Div 2:
1) Vertical vessel base ring tilt & levelness
2) Horizontal vessel skirt base plate tilt and levelness
Is there any reference in sec VIII?
Thanks in advance
Sree





RE: Tolerance for base plate
Rao discusses this in Section 22.19 Fabrication Tolerances http://bo
Some references to tolerances are:
- AS 4458 Appendix F
- PD-5500 Annex L
- PIP VEFV1100M (dwg. VEFV1102M)
- Standard Tolerances for Pressure Vessels Chpt 20 of Practical guide to pressure vessel manufacturing By Sunil Pullarcot
RE: Tolerance for base plate
The max. deviation from horizontal of bearing surface of base ring or base plate:
ID < 1200 mm (+/- 3 mm)
ID < 2000 mm (+/- 5 mm)
ID > 2000 mm (+/- 7 mm)
Per AS-4458 Appendix F
Tilt or out of level of saddle or skirt base plate:
ID < 1200 mm (+/- 3 mm)
ID < 2100 mm (+/- 5 mm)
ID < 4000 mm (+/- 6 mm)
ID < 5000 mm (+/- 8 mm)
ID > 5000 mm (+/- 10 mm)
PD-5500 Annex L
Horizontal saddles flatness:
Transverse direction (+/- 2 mm)
Longitudinal direction (+/- 4 mm)