Serrated or Non-serrated grating
Serrated or Non-serrated grating
(OP)
Our Company is designing a seven story refinery open structure (no roof or walls) which has continuous handrails and stairs for means of egress. The question is whether the working surface requires non-slip surface. The IBC 1003.4 Floor Surface requires it to be slip-resistant, but it all leads to the question of whether this structure is occupied or un-occupied. There will be routine maintenance throughout each day. I know this must have been decided prior to now but can not find any defined answer. Thanks in advance for any help.






RE: Serrated or Non-serrated grating
Their experience is that actual "slip-resistance" of both products is essentially identical.
For a given grating size, non-serrated has higher load capacity. Serrated grating has the "scalloped" surface to created the serrations. The scallops reduce both moment of inertia and section modulus of the main bars.
We have continued to use non-serrated grating, successfully.
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RE: Serrated or Non-serrated grating
Dik
RE: Serrated or Non-serrated grating
RE: Serrated or Non-serrated grating
RE: Serrated or Non-serrated grating
RE: Serrated or Non-serrated grating
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RE: Serrated or Non-serrated grating
RE: Serrated or Non-serrated grating
Dave
Thaidavid
RE: Serrated or Non-serrated grating
RE: Serrated or Non-serrated grating
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RE: Serrated or Non-serrated grating
Dik
RE: Serrated or Non-serrated grating
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RE: Serrated or Non-serrated grating
1. Typical non-serrated for our stations: LL = 100 lb/ft2, use W-19-4 (1 1/4 x 3/16) Hot-Dip Galvanized Steel (Approx. Weight = 9 lb/ft2)
From NAAMM MBG-531-09:
Therefore serrated: LL = 100 lb/ft2, use W-19-4 (1 1/2 x 3/16) Hot-Dip Galvanized (Approx. Weight = 11 1b/ft2)
Cost of grating proportional to weight: (11 lb/ft2 - 9 lb/ft2) / 9 lb/ft2 = Approx. 20% additional cost per ft2
2. Don't know about a refinery. For an electric generating station, several acres. Estimated 6+ acres for our larger units.
Can see where ice may be a game-changer. Rarely a problem in eastern SC.
Hot-dip galvanized surface should help on non-serrated.
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RE: Serrated or Non-serrated grating
Additional 20% in material cost doesn't say much without looking at total cost of project. If total project cost is 10 million and 50,000 is material cost for grating...an extra $10,000 is not much if it reduces insurance claims and possible worker comps in future. My moto think cheap long term not short term.
RE: Serrated or Non-serrated grating
The "if" is the key. As a former "sophisticated" Owner's employee, I would ask for reasonable evidence, not professional opinion, before agreeing to the extra cost. Where is the evidence?
To my knowledge (I have looked), OSHA does not offer an opinion on superiority of serrated grating.
Have looked (actually performed a pdf search) through the 112 page Ohio Grating Catalog. The term "OSHA" is not mentioned even once. You would think that a manufacturer would advertise a clearly better product.
It's all about reasonable proof. If the evidence is there... go with serrated.
BTW, total project cost for a generating station is more like $1 billion. Six acres of grating (material only) about $4 million. Add $800,000 to that grating cost to switch from non-serrated to serrated.
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