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<div dir="ltr" data-setdir="false">Rick, I would do some more research on annealing your port again. If I recall, a window is only allowed one annealing cycle. The reason for annealing after machining is due to heat build up for machining. I have machined and tested ports without an annealing cycle. The trick is to take super small passes .005 and even spray water on it as its cutting. I was talking to a machinist one time about machining domes and he put ice water in the dish to keep it cool.</div><div dir="ltr" data-setdir="false">Its been a while since I worked on this, so check it out, in case my memory is off.</div><div dir="ltr" data-setdir="false">Hank</div><div><br></div>
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On Tuesday, December 10, 2024 at 10:55:04 AM MST, Rick Patton via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="yiv5576316659"><div><div dir="ltr">Hey Sean,<div>The viewports are flat. Thanks for the data.</div></div><br clear="none"><div class="yiv5576316659gmail_quote yiv5576316659gmail_quote_container"><div id="yiv5576316659yqtfd55475" class="yiv5576316659yqt2902846855"><div dir="ltr" class="yiv5576316659gmail_attr">On Tue, Dec 10, 2024 at 6:12 AM Sean T. Stevenson via Personal_Submersibles <<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;" class="yiv5576316659gmail_quote"><div style="font-family:Arial, sans-serif;font-size:14px;"><div style="font-family:Arial, sans-serif;font-size:14px;">Rick, is this a flat disc viewport, and not a dome?</div><div style="font-family:Arial, sans-serif;font-size:14px;"><br clear="none"></div><div style="font-family:Arial, sans-serif;font-size:14px;">See an excerpt from ASME PVHO-1-2023 below. <i>Do</i>, where referenced, is the window major diameter.</div>
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2-2.11.4 Flat Disk Windows</b></div><div style="font-family:Arial, sans-serif;font-size:14px;"><b><br clear="none">2-2.11.4.1 Window External Diameter.</b> </div><div style="font-family:Arial, sans-serif;font-size:14px;"><br clear="none"></div><div style="font-family:Arial, sans-serif;font-size:14px;">The dimensional tolerance of the external diameter of the window shall be based on the type of sealing arrangement for the window.</div><div style="font-family:Arial, sans-serif;font-size:14px;"><br clear="none"><b>
(a)</b> The external diameter of the flat disk window shall be within +0.000/−0.010 in. (+0.000/−0.25 mm) of the nominal value if the window is to be sealed in the seat cavity with a radially compressed O-ring.</div><div style="font-family:Arial, sans-serif;font-size:14px;"><br clear="none"><b>
(b)</b> The external diameter of the flat disk window shall be within +0.000/−0.060 in. (+0.000/−1.5 mm) of the nominal value if the window is to be sealed in the seat<br clear="none">
cavity with a seal ring wedged into the annular space between the retaining ring, the window’s bevel, and the cylindrical surface of the seat cavity.</div><div style="font-family:Arial, sans-serif;font-size:14px;"><br clear="none"><b>
(c)</b> The external diameter of the flat disk window shall be within +0.0/−0.125 (+0.0/−3.2 mm) of the nominal value if the window is to be sealed in the seat cavity with a flat elastomeric gasket axially compressed by the retaining ring.</div><div style="font-family:Arial, sans-serif;font-size:14px;"><br clear="none"><b>
(d)</b> The external diameter of the flat disk window shall be within +0.00/−0.02 <i>Do</i> of the nominal value if the window is to be sealed in the seat cavity with a room temperature curing elastomeric compound injected into the annular space between the edge of the window and the cylindrical surface of the seat.</div><div style="font-family:Arial, sans-serif;font-size:14px;"><br clear="none"><b>
(e)</b> The plane bearing surface of the flat disk window shall not deviate more than 0.001 <i>Do</i> from an ideal plane.</div><div style="font-family:Arial, sans-serif;font-size:14px;"><br clear="none"></div><div style="font-family:Arial, sans-serif;font-size:14px;"><b><br clear="none"></b></div><div style="font-family:Arial, sans-serif;font-size:14px;"><b>2-2.11.4.2 Seat Cavity Diameter.</b></div><div style="font-family:Arial, sans-serif;font-size:14px;"><br clear="none"></div><div style="font-family:Arial, sans-serif;font-size:14px;">The dimensional tolerance on the external diameter of the window seat<div><span>cavity shall be based on the type of sealing arrangement </span>for the window.</div><div><span><br clear="none"></span></div><div><b>(a)</b> The diameter of the seat cavity for a flat disk window shall be within +0.01/−0.00 in. (+0.25/−0.00mm) of the nominal value if the window is to be sealed in the seat cavity with a radially compressed O-ring.</div><div><br clear="none"></div><div><b>(b)</b> The diameter of the seat cavity for a flat disk window shall be within +0.06/−0.00 in. (+1.5/−0.00mm) of the nominal value if the window is to be sealed in the seat cavity with a seal ring wedged into the annular space between the retaining ring, the window’s bevel, and the cylindrical surface of the seat cavity.</div><div><br clear="none"></div><div><b>(c)</b> The diameter of the seat cavity for a flat disk window shall be within +0.125/−0.000 in. (+3.2/−0.00mm) of the nominal value if the window is to be sealed in the seat cavity with a flat elastomeric gasket axially compressed by the retaining ring.</div><div><br clear="none"></div><div><b>(d)</b> The diameter of the seat cavity for a flat disk window shall be within +0.01 <i>Do </i>/−0.000 of the nominal value if the window is to be sealed in the seat cavity with a room-temperature curing elastomeric compound injected into the annular space between the edge of the window and the cylindrical surface of the seat.</div><div><br clear="none"></div><div><b>(e)</b> The plane bearing surface of the seat cavity shall not deviate more than 0.002 <i>Do</i> from an ideal plane when measured with a feeler gauge inserted between the mating plane surfaces of the flat disk window or a circular plug gauge and the bare seat cavity. The axial force used to seat the window or the plug gauge shall not exceed 10 <i>Do</i> lb (4.53 <i>Do</i> kg) applied uniformly around its circumference.</div><div><br clear="none"></div><div>Sean</div><div><br clear="none"></div></div>_______________________________________________<br clear="none">
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