Our project includes a warehouse ESFR fire sprinkler system.
We specified minimum Schedule 10 for all pipe. The contractor has proposed Schedule 7 for use in the 2-1/2" and 4" diameter pipe. Any pros or cons to using Schedule 7 that you'd recommend from experience? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
12 Comments
Sidney T Forin
11/3/2021 08:14:25 am
Check the levels of MIC in the local city water system, we've replaced a lot of schedule 7 pipe with pin holes in certain areas where the levels of MIC was high.
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Anthony
11/3/2021 08:16:50 am
Its thinner, so obvious downsides from a life span and durability stand point.
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David Kendrick
11/3/2021 10:09:34 am
This caught my eye.
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Anthony
11/16/2021 08:35:02 am
It was the number thrown around our office when ordering I was never the purchasing agent so I may be off on the cost savings.
Dan Wilder
11/3/2021 08:17:01 am
Pros
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Jesse
11/3/2021 08:22:37 am
I guess my answer would depend on why Schedule 10 was specified. We find a lot of institutional projects spec Sch. 40, but find that their general spec requirements are often times decades old. When we present them with reasons to use Schedule 10, they often see benefit.
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Shawn Hoyer
11/3/2021 09:31:38 am
The main issue is corrosion at the peak where there is the water/air interface as Dan had mentioned. Even if the system is designed and installed to help alleviate the trapped air, there will be portions where the air will still be trapped and corrosion will happen. The question is how long before it happens.
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Lucas Kirn
11/3/2021 10:00:43 am
I echo Shawn’s comment above. It’s important to consider the owner’s plan for the building - short term build and sell or long term hold? Another consideration is what the building is being used for. Is it basic storage of dry goods or is it a production facility or fulfillment center that would be more sensitive to business disruption if the sch 7 pipe begins to experience leaks/failures?
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Dave
11/3/2021 10:37:24 am
Probably not a deciding factor, but don't forget that the lateral sway bracing section of NFPA #13 requires you to comply with the maximum load tables in NFPA #13, or if it is not one of those pipe types (e.g., S40, S10, S5), you must use the values published by the manufacturer. (Some brace calculations software prompts you of this requirement.) Wheatland and Bull Moose for example have pdf maximum load tables for their versions of flow-pipe.
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Robert Allan Kluck
11/3/2021 02:01:07 pm
You don't mention the material (Carbon Steel or SS). If it is Carbon Steel, the risk of MIC might be high, especially if your city water that will fill the system is more chemically active( or if the area is a chemical or salt air environment). If it is stainless steel, then the risk of corrosion goes down substantially.
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sean
11/5/2021 06:26:53 am
I see the most common reason in my area to use schedule 7 is weight. Easier on the field guys to move it around.
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Alex
11/5/2021 07:15:21 am
Hi,
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