[AR] Re: Chamber pressure testing
- From: "" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "JMKrell@xxxxxxx" for DMARC)
- To: arocket@xxxxxxxxxxxxx
- Date: Wed, 10 Sep 2014 11:11:30 -0400
I used a similar plumbers tool testing solid casings. One modification was
a conical lower plug that matched the nozzle. This relieved the
differential pressure on the graphite throat insert. I remember Ray Goodson
testing
one of his engine assemblies to ~1700 psi with hydraulic fluid.
A cautionary note: acoustical standing waves cannot be hydrostatically
replicated. I had engines fail at significantly lower pressures than what we
hydrostatic tested.
Krell
In a message dated 9/10/2014 6:41:24 A.M. Pacific Daylight Time,
wclaybaugh2@xxxxxxxxxx writes:
There is a standard plumbing tool that consists of a rubber plug with
metal caps at both ends and a bolt running between; the bolt is sealed with
rubber washers. Tightening the bolt expands the rubber plug and seals the
opening.
Obviously, this would need to be customized for your specific diameter and
I am skeptical it will hold more than a few hundred psia. Ben's caution
about differential pressure pertains.
Bill
Sent from my iPhone
On Sep 9, 2014, at 20:31, Ben Brockert <wikkit@xxxxxxxxx> wrote:
> I've seen Robert's approach used up to 600 psi or so.
>
> The lowest force approach is to make a plug rod that has a male gland
> seal that fits into the throat. Retain it via whatever means are
> convenient.
>
> It does mean that the wall just downstream of the throat has a
> pressure on it that is much different than operational in the case of
> a regen system, i.e. normally it would have near throat pressure just
> downstream of the throat but instead it will be at atmospheric, so the
> differential pressure between regen side and nozzle side will be
> higher than operational. Closing out at the exit plane has the
> opposite problem, giving no differential pressure between regen and
> nozzle.
>
>
>
> On Tue, Sep 9, 2014 at 8:26 PM, Robert Watzlavick
<rocket@xxxxxxxxxxxxxx> wrote:
>> My chamber has an open cap on the exit that closes out the regen cooling
>> passages. For pressure/leak tests, I replace that open cap with a solid
>> one. Mine only operates at 250 psi though.
>>
>>
http://www.watzlavick.com/robert/rocket/regenChamber3/tests/dsc_1840m.jpg
>>
>> -Bob
>>
>>
>> On 09/09/2014 07:31 AM, Peter Fairbrother wrote:
>>>
>>> Chamber for a bi-liquid, has a main joint at the top, several pipe
entry
>>> points etc. Operates (or should) at 2,100 psi, so even a tiny leak
could be
>>> disastrous - think Challenger.
>>>
>>>
>>> I want to pressure-test it to maybe 3,500 psi, and was wondering if
there
>>> was a standard way to seal the nozzle for testing?
>>>
>>> Any other thoughts?
>>>
>>>
>>> -- Peter Fairbrother
>
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