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Re: Below-Ground Vault or Wet-Well for Fire Water Storage

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Has anyone happen to come across anything in the NFPA that might have 
bearing on this design?

William L. Polhemus, Jr. P.E.


> On Feb 24, 2014, at 5:57 PM, "Lloyd" <lloyd(--nospam--at)> 
> wrote: 
> I've done these types of systems and have used both concrete and
> poly vaults.  The only thing that we had to do, beyond a typical septic
> tank vault, was where the vault might be driven over.  With the
> possibility for a truck load on the top of the vault, we had to design
> the top and lid of the vault to an HS-20 load standard.
> I would also consider the vault's potential for floating up out of the
> ground when it gets sucked empty and the soils around it
> have a high ground water condition.
> HTH,
> Lloyd
>> On 24 Feb 2014 at 21:52, Polhemus, William wrote:
>> This is kinda civil-y, but I thought someone here might have some idea
>> if there are any governing requirements I need to be aware of.

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