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Tolerance for base plate

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


 

RE: Tolerance for base plate

ASME Sec VIII Div 1 and 2 have limited requirements on tolerances.  It is generally based on the clients requirements.

Rao discusses this in Section 22.19 Fabrication Tolerances http://books.google.com.au/books?id=AOCn1A3B4LoC&lpg=PA154&ots=wiU8zjPUvz&dq=vessel%20tolerances&pg=PA154#v=onepage&q=vessel%20tolerances&f=false

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

Just had a look and per Pullarcot

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)





 

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