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	<title>Surface Production Facility &#187; Relief Valve Sizing</title>
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	<description>Oil and Gas Production Facility Design</description>
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		<title>Relief Valve Sizing &#8211; Two-Phase Flow, Standard Sizes</title>
		<link>http://www.process-facility.com/relief-valve-sizing-two-phase-flow-standard-sizes.html</link>
		<comments>http://www.process-facility.com/relief-valve-sizing-two-phase-flow-standard-sizes.html#comments</comments>
		<pubDate>Fri, 25 Sep 2009 04:06:01 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Relief Valve Sizing]]></category>
		<category><![CDATA[Relief Valve]]></category>

		<guid isPermaLink="false">http://www.process-facility.com/?p=2089</guid>
		<description><![CDATA[




Two-Phase Flow
There are no precise formulas for calculating orifice area for twophase flow. The common convention is to calculate the area required for the gas flow as if there were no liquid present and the area required for
the liquid flow as if there were no gas present. The two areas are then added to approximate [...]]]></description>
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		<title>Relief Valve Sizing &#8211; Flow Rate for Liquids</title>
		<link>http://www.process-facility.com/relief-valve-sizing-flow-rate-for-liquids.html</link>
		<comments>http://www.process-facility.com/relief-valve-sizing-flow-rate-for-liquids.html#comments</comments>
		<pubDate>Fri, 25 Sep 2009 03:57:42 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Relief Valve Sizing]]></category>
		<category><![CDATA[Relief Valve]]></category>

		<guid isPermaLink="false">http://www.process-facility.com/?p=2080</guid>
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Conventional Valve, Balanced-Bellows Valve, or Pilot-Operated Valve
The corresponding equations for liquid flow are the following:

 
Note that a preliminary orifice size must be determined in order to calculate Reynolds number. If the viscosity correction is significant, it may be necessary to iterate to get a final size.
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		<title>Relief Valve Sizing &#8211; Flow Rate for Gas</title>
		<link>http://www.process-facility.com/relief-valve-sizing-flow-rate-for-gas.html</link>
		<comments>http://www.process-facility.com/relief-valve-sizing-flow-rate-for-gas.html#comments</comments>
		<pubDate>Fri, 25 Sep 2009 02:58:27 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Relief Valve Sizing]]></category>
		<category><![CDATA[Relief Valve]]></category>

		<guid isPermaLink="false">http://www.process-facility.com/?p=2073</guid>
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The flow rate for gas through a given orifice area or the area required  for a given flow rate is obtained by:




]]></description>
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		<title>Relief Valve Sizing &#8211; Effects of Back-Pressure</title>
		<link>http://www.process-facility.com/relief-valve-sizing-effects-of-back-pressure.html</link>
		<comments>http://www.process-facility.com/relief-valve-sizing-effects-of-back-pressure.html#comments</comments>
		<pubDate>Fri, 25 Sep 2009 02:53:55 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Relief Valve Sizing]]></category>
		<category><![CDATA[Relief Valve]]></category>

		<guid isPermaLink="false">http://www.process-facility.com/?p=2066</guid>
		<description><![CDATA[Back-pressure can affect either the set pressure or the capacity of a relief valve. The set pressure is the pressure at which the relief valve begins to open. Capacity is the maximum flow rate that the relief valve will relieve. The set pressure for a conventional relief valve increases directly with back-pressure. Conventional valves can [...]]]></description>
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		<title>Relief Valve Sizing &#8211; Critical Flow</title>
		<link>http://www.process-facility.com/relief-valve-sizing-critical-flow.html</link>
		<comments>http://www.process-facility.com/relief-valve-sizing-critical-flow.html#comments</comments>
		<pubDate>Fri, 25 Sep 2009 02:06:18 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Relief Valve Sizing]]></category>
		<category><![CDATA[Relief Valve]]></category>

		<guid isPermaLink="false">http://www.process-facility.com/?p=2061</guid>
		<description><![CDATA[The flow of a compressible fluid through an orifice is limited by critical flow. Critical flow is also referred to as choked flow, sonic flow, or Mach 1. It can occur at a restriction in a line such as a relief valve orifice
or a choke, where piping goes from a small branch into a larger [...]]]></description>
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