X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [216.211.128.10] (HELO mail-in02.adhost.com) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 883569 for flyrotary@lancaironline.net; Thu, 15 Dec 2005 13:08:00 -0500 Received-SPF: none receiver=logan.com; client-ip=216.211.128.10; envelope-from=joeh@pilgrimtech.com Received: from Pilgrim10 (tide41.microsoft.com [131.107.0.84]) by mail-in02.adhost.com (Postfix) with ESMTP id 31FF4314E25 for ; Thu, 15 Dec 2005 10:06:59 -0800 (PST) (envelope-from joeh@pilgrimtech.com) From: "Joe Hull" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Radiator Expansion Tank Date: Thu, 15 Dec 2005 10:06:58 -0800 Message-ID: <00f101c601a2$5796ace0$0708460a@redmond.corp.microsoft.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00F2_01C6015F.49736CE0" X-Mailer: Microsoft Office Outlook 11 In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670 Thread-Index: AcYBoKMiBbVvgQl+RO6P9O1cCAeVkgAAKhLw This is a multi-part message in MIME format. ------=_NextPart_000_00F2_01C6015F.49736CE0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit I think he's saying that it's 15lb rated pressure when there is 15lbs on one side and normal atmospheric pressure on the other side (14.7lbs/sq inch). If the cap has 22 lbs of pressure on the "atmosphere side" instead of the normal 14.7 then it would take 15lbs plus 7lbs (the difference between 14.7 and 22) or a total of 22lbs to open it. I think the original math was off a little because it didn't subtract the expected atmospheric pressure from the cap rating. In other words I don't think the pressure rating is additive. Joe Hull Cozy Mk-IV #991 (preping for DAR inspection - details, details) Redmond (Seattle), Washington _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Echo Lake Fishing Resort (Georges Boucher) Sent: Thursday, December 15, 2005 9:53 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Radiator Expansion Tank Hi! Todd I'm not getting it, what stops the 15lb cap relief valve from opening at its rated pressure? Even if it dumps into the 22lb reservoir the pressure still can't be greater than 22lbs. What am I missing? Georges B. -------Original Message------- From: Todd Bartrim Date: 12/15/05 05:50:21 To: Rotary motors in aircraft Subject: [FlyRotary] Re: Radiator Expansion Tank Todd Can you explain how using two pressure caps (one 22lb & one 15 lb) add up to a possible total system pressure of 37lbs. I can only see it as a max of 22lbs, Georges B. Hi Georges; The rad caps are differential meaning that they will hold back their rated pressure above the pressure seen at the outlet. So if the the first cap produces a 15 psi increase over atmospheric pressure, then the second cap which has it's outlet plumbed to the 15 psi reservoir will further increase this by it's rated pressure (22 psi in this case) to give a total of 37 psi. At least that's the way I see it. Todd ------=_NextPart_000_00F2_01C6015F.49736CE0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

I think he’s saying that = it’s 15lb rated pressure when there is 15lbs on one side and normal atmospheric = pressure on the other side (14.7lbs/sq inch). If the cap has 22 lbs of = pressure on the “atmosphere side” instead of the normal 14.7 then it = would take 15lbs plus 7lbs (the difference between 14.7 and 22) or a total of 22lbs = to open it.

I think the original math was off a = little because it didn’t subtract the expected atmospheric pressure from = the cap rating. In other words I don’t think the pressure rating is = additive.

Joe = Hull

Cozy Mk-IV #991 (preping for DAR = inspection - details, details)

Redmond (Seattle), Washington

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Echo Lake Fishing = Resort (Georges Boucher)
Sent: Thursday, December = 15, 2005 9:53 AM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = Radiator Expansion Tank

Hi! = Todd

I'm = not getting it, what stops the 15lb cap relief valve from opening at = its rated pressure? Even if it dumps into the 22lb reservoir the pressure still = can't be greater than 22lbs. What am I missing?

Georges = B.

-------Ori= ginal Message-------

From: Todd Bartrim

Date: 12/15/05 = 05:50:21

To: Rotary motors in = aircraft

Subject: = [FlyRotary] Re: Radiator Expansion Tank

Todd

Can = you explain how using two pressure caps (one 22lb & one 15 lb) add up to a = possible total system pressure of 37lbs. I can only see it as a max = of 22lbs,

Georges B.

Hi Georges;

The rad caps are differential meaning = that they will hold back their rated pressure above the pressure seen at = the outlet. So if the the first cap produces a 15 psi increase over = atmospheric pressure, then the second cap which has it's outlet plumbed to the 15 = psi reservoir will further increase this by it's rated pressure (22 psi in = this case) to give a total of 37 psi.

At least that's the way I see = it.

Todd

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