[Dlsupport] Fwd: Answers to P&Id feedback

[Stephen Benson]

This is an update to the P&I documentation.

Begin forwarded message:

> From: Chris Vidal <cvidal at mit.edu>
> Subject: Answers to P&Id feedback
> Date: May 18, 2016 at 8:54:57 AM EDT
> To: "'Stephen Benson'" <felman at jlab.org>, Eric Sun <qsun at jlab.org>
> Cc: "Kelsey, James " <jkelsey at mit.edu>
> 
> I have attempted to answer the questions or concerns provided to Jim in a feedback email regarding the draft of the P&ID we recently submitted. Some of these I was not able to answer and must defer to Jim, who will provide a response       when he has done some flow calculations. 
> Below are the answers and attached is an updated P&ID to reflect these concerns.
> 
> 
> (1)       The pressure relief valve and the H2 bottle shall be placed outside the building. If they are inside the building, JLab fire protection engineer must approve it
> Gas supply now shown to be outdoors.
> (2)       What is the size of ORF-07 (G-21-55)? Is G-21-55 the correct model number? Do you mean G-21-SS?
> Yes. G-21-SS I copied it from the sample document you provided for your gas delivery cart, and miss read it.
> (3)       No information was provided for PRS-01 and PRS-02. What is their rated pressure?
> The configuration we would use has been noted on the component selection page and highlighted on the manufacturers spec page
> (4)       After s. PRS-02, a pressure relief valve shall be installed here. It must have an ASME stamp. The set pressure of the relief valve must be clear and obvious on the drawing.
> Done
> (5)       MFC-01 could fail, so BAR-01 could see the set pressure of the relief valve. However, BAR-01 is only good for 1000 Tor. This is not acceptable. A calibrated pressure gauge must be used here.
> Manufacturers' specifications provided show the max pressure at 400kpa or 58psi. The regulator on the H2 bottle should be set much lower than this.
> (6)       The pressure boundary shall be the flange after GV-01 NC. The upstream piping of the flange is pressure piping; the downstream piping, vacuum.
>  
> (7)       PRLF-01 is not needed because the check valve (CK-02, relief valve) should be enough.  
> See answer to (8) below.
> (8)       CK-02 should be directly connected to the vacuum vessel. The document lists that the cracking pressure of CK-02 is 0.1-25 psig. Is this your intention? Anything larger than 14.7 psig will make it a pressure piping system. I think CK-02 shall have a much smaller cracking pressure. The manufacturer lists the cracking pressure of 249B-16PP is 2-4 psig. Also, the relieving capacity shall be checked to see if the check value is large enough to handle the H2 flow rate under the cracking pressure in the worst case scenario. The fully open pressure of the check valve must be on the drawing.
> If we eliminate CK-)@ and keep PRLF-01 does this satisfy you concerns for both (7) and (8)? PRLF-01 has a diameter of 1.5 inches and a pressure of 1E-7 hPa to 500hPa with a over pressure difference of 200hPa.
> (9)       The pressure of the instrument air supply is 80 psig, not 60 psig. Please make sure 80 psig is okay with you.
> Yes this is OK and will be changed on the drawing.
> (10)    The H2 vent must be continuously flushed. The current design doesn’t do that. If the roots blower vacuum pump does not work, there will be no flushing N2.
> Changed to a direct N2 connection.
> (11)    A control valve, similar to MFC-01, must be used to control the flow rate of N2. The flow rate requirement is in SOW. A solenoid value is needed in the N2 circuit to interlock with GV-01 NC, meaning if GV-01 NC is open, this solenoid valve must be open to flush the vent with N2. The flushing flow rate must be on the drawing.
> (12)    For each valve and instrumentation device, in addition to model number and size, please list the design pressure, design temperature, rated pressure, fluid service (per ASME B31.3), fluid, and ASME stamped or not.
> This information was already included in the Manufacturer's Spec Sheets provided, and is also now in the table on page 2 of the drawing.
> (13)    ORF-08 may not be needed.
> ORF-08 removed.
> (14)    Code calculation of piping, sizing of the relief valve and the check valve, and calculation of required flushing N2 flow rate are required. The calculation may be simple and obvious, but we must have the appropriate documentations.
> (15)    The label font of the drawing is really small. It is hard to read them when I print the P&ID on an A2 paper.
> Original drawing is a D size as shown in the title block. We were not aware you required an A2. Font size has been increased as much as I feel works in the space constraints. Hope this is sufficient.
> (16)    The size of GV-01 NC is not readable.
> (17)    ORF-01 should be KAPTON, not KAPTOM.
> Corrected

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