Process Equipment Anchor Bolting Torque
Process Equipment Anchor Bolting Torque
(OP)
Hello,
I want to know which is the torque value to be applied on the base anchor bolts of pressure vessels, process columns and stacks.
Can I simply use the torque values determined for bolts considering bolt diameter and material?
Some say the correct practice is tightening the nut by hand until it locks, then tighten it a quarter of round by tool (nut wrench), put on it a lock-nut and tight it by tool again. Is it correct?
Isn't this harmful to the concrete and grouting?
Is there any standard mention about anchor bolting torquing?
Thanks!
LPC1
I want to know which is the torque value to be applied on the base anchor bolts of pressure vessels, process columns and stacks.
Can I simply use the torque values determined for bolts considering bolt diameter and material?
Some say the correct practice is tightening the nut by hand until it locks, then tighten it a quarter of round by tool (nut wrench), put on it a lock-nut and tight it by tool again. Is it correct?
Isn't this harmful to the concrete and grouting?
Is there any standard mention about anchor bolting torquing?
Thanks!
LPC1





RE: Process Equipment Anchor Bolting Torque
You need to consider the pullout force of the bolt from the concrete.
I given a link to a typical Hilti fastener with a given grouting/concrete system, if you read through it, it will give you some idea for what you are trying to do
http://www.hilti.co.uk/fstore/holuk/techlib/docs/H...
RE: Process Equipment Anchor Bolting Torque
RE: Process Equipment Anchor Bolting Torque
RE: Process Equipment Anchor Bolting Torque
RE: Process Equipment Anchor Bolting Torque
For instance, for a 3/4" dia HIT-HY 150 MAX with threaded rod.... Tmax = 100 ft-lbs.
http://www.us.hilti.com/fstore/holus/techlib/docs/...
Note that they will lower this at close edge distances (see the tech guide)
ZCP
www.phoenix-engineer.com
RE: Process Equipment Anchor Bolting Torque
Our facility typically has 20-55 year old attachment materials which typically requires NEW foundations or increasing the number, size or type of fastener to secure properly. 1950's concrete and steel in my experience is typically 1/2-2/3 the strength of material today. Possibly 2 different diameter studs could be used?
Rich