Hi
Does a butterfly valve for steam service need to have metal seats?
Design conditions:
Saturated steam, 200 psig and 400F
I'm looking at high-performance butterfly valves with the following specs:
carbon steel body (WCB), ANSI class 150 to B16.34 (200 psig, 400F)
Lug style
Not sure if I...
How soon can the formwork for the roof of an underground vault be removed and how soon can loading be allowed on top of it? This structure is an underground vault with dimenstion of 12'x12'x12' with thickness of 10" for all elements w/ 35MPa concrete.
Thanks
We are building a 30-foot underground concrete trench box for a utility service with dimensions of 3'x3'. We will have a monolithic pour for slab-on-Grade and walls. The top slabs will be precast and lowered on top of the walls at the end of project. A notch will be provided on top of walls so...
Hi
Is it harmful, if freshly poured concrete is subjected to 40 to 50 degrees celcius during its curing period?
Does anybody think I should be using retarder in the mix?
Thanks guys
Hi Guys,
I want to repair an old polygon shaped concrete manhole/vault that is 8' tall. The top slab is in a very bad shape as the rebars are exposed and corroded but the walls and floor slab are fine. I'v decided to replace the top slab by demolishing it and perform an in-place-pour or...
