Tightening the anchor bolt's nut
Tightening the anchor bolt's nut
(OP)
Dear experts :)
Is there any standard / code about how many NM or Ft.Lb required when we are tightening the nut of the anchor bolts on the tank ?
Best regards,
Syah
Is there any standard / code about how many NM or Ft.Lb required when we are tightening the nut of the anchor bolts on the tank ?
Best regards,
Syah





RE: Tightening the anchor bolt's nut
Good information here: http://www.engineersedge.com/civil_engineering/con...
Generally speaking, there is no hard and fast rule for tank anchor bolt torque. " Turn of the nut" method is commonly used.
http://www.civildesignhelp.info/ab.html
Do not torque the tank anchor bolts until the tank has its initial fill of liquid.
More information here: (but its for plastic tanks !)
https://books.google.com/books?id=Go10cKT7vgoC&...
MJCronin
Sr. Process Engineer
RE: Tightening the anchor bolt's nut
RE: Tightening the anchor bolt's nut
RE: Tightening the anchor bolt's nut
After the first tightening of anchors in concrete, especially cast-in-place anchors, they loosen themselves up. After the vessel/tank has had a few days after being full, per MJCronin post above, go back and Retighten, then lock the nuts [if you wish].
Don't overthink the 'Snug Tight'. For smaller stuff, it is "Full effort of a man on an ordinary [spud] wrench". For bigger stuff [like anchor bolts], it is "A few blows of an impact wrench". Put a wrench on the nut, hit it a couple of times with an ironworker's 'beater' [4# to 8#], keep hitting until the nut stops turning and the hammer just rebounds, and you are done. Rinse and Repeat.
RE: Tightening the anchor bolt's nut