clip or bolt hold down for process skid

[bob116]

I have a number of chemical process skids under my control and they are fixed down to the concrete with an inverted angle which is then bolted down thru a hold down bolt into the concrete. Underside of skid is grouted to the concrete in the vicinity of the hold down. About 3 per side of skid.
This is presumably to allow the skid to expand due to thermal loads, either sunlight or process heat.
The piping comes from a piperack nearby, which could be considered as rigid. However given the amount of air between the skid and the pipework, I don't think the process heat would govern.
The skids are reasonably small, about 10 metres (33 feet) long.
Seismic and wind loads are negligible, I think friction would be enough to stop them sliding and the angle would prevent overturning.
Still I am surprised they don't have a conventional hold down bolt thru the skid flange.
Does anyone have any ideas?

 

[dhengr]

Bob116:
Show us a cross sectional sketch through the skid side sill and these angles and the slab. I’m not sure I understand what you trying to tell us. Loads, dimensions, reasonable proportions please, they help us get a feel for the problem. It sounds like a pretty quick and dirty way of holding the skid down and within some confined location set by the angles which are bolted down, but otherwise it’s kinda loose and allowed to move laterally within those vert. angle legs. They don’t need to set anchor bolts very accurately on two 33' parallel lines, to match the side sill flange holes. There should be some pipe stress analysis engineering involved in this kind of system, ask them about this. And, too much movement of these skids might do more damage to the pipes than the other way around. Alternatively, if they’ve been doing it this way for years, and it works on this equipment, what do we know?