I wouldn’t think one is sufficient. Any motion due to pressure fluctuations
could create a problem.
That being said, I would sit across the street in a lawn chair with a couple of
beers and watch the 200 psi test.
>
> On Jan 5, 2022 at 9:33 AM, <Kevin Hall via Sprinklerforum
> (mailto:[email protected])> wrote:
>
>
>
> I do not believe one is sufficient. I recall a project where the
> specification limited the maximum number of exposed threads to 2 or 3. I'd
> have to do some research to find the product/installation standard that was
> referenced. Kevin Hall, M.Eng., P.E., ET, CWBSP, PMSFPE Coordinator,
> Engineering and Technical Services American Fire Sprinkler Association
> [email protected] (mailto:[email protected]) 214-349-5971
> (tel:214-349-5971) On Wed, Jan 5, 2022 at 2:16 AM Dan Arbel via
> Sprinklerforum < [email protected]
> (mailto:[email protected])> wrote: > Dear Forum
> Members > > I have a case where 1.25" NPT pipe nipple was connected to
> 1.25" BSP (as > per British standard) pipe. > > Sprinkler System in
> interstitial space. > > There was only 2 threads engagement. > >
> After about 15 years somebody touched the a pipe and the connection >
> disengaged. > > I would appreciated the members opinion on the allegation
> that even one > thread engagement is sufficient providing sufficient
> strength. > > Dan Arbel > Dan Arbel Risk Engineering Ltd > Mail:
> [email protected] (mailto:[email protected]) > WEB SITE:
> www.riskmanage.com (http://www.riskmanage.com) > Mobile: +972-52-6611337
> (tel:+972-52-6611337) > Tel: +972-4-8243337 (tel:+972-4-8243337) >
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