An error occurred in template Page.externalHead.ftl for Content with ID ibm:///catalog/category/Control-Valves}.
Show Details 
FreemarkerView[template=/jar:id:contentproperty:/Themes/emerson/templates/emerson-templates.jar/archive!/META-INF/resources/WEB-INF/templates/emerson/com.coremedia.blueprint.common.contentbeans/Page.externalHead.ftl]
com.coremedia.livecontext.contentbeans.ProductDetailPage[navigation=LiveContextExternalChannel{contentId=coremedia:///cap/content/607658, externalId=ibm:///catalog/category/Control-Valves}, content=LiveContextExternalChannel{contentId=coremedia:///cap/content/607658, externalId=ibm:///catalog/category/Control-Valves}]
Error rendering view
The following has evaluated to null or missing:
==> emr.getLinkCustomed [in template "jar:id:contentproperty:/Themes/emerson/templates/emerson-templates.jar/archive!/META-INF/resources/WEB-INF/templates/emerson/com.coremedia.blueprint.common.contentbeans/CMCSS.asCSSLink.ftl" at line 6, column 22]

----
Tip: It's the step after the last dot that caused this error, not those before it.
----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
	- Failed at: #assign cssLink = emr.getLinkCustomed... [in template "jar:id:contentproperty:/Themes/emerson/templates/emerson-templates.jar/archive!/META-INF/resources/WEB-INF/templates/emerson/com.coremedia.blueprint.common.contentbeans/CMCSS.asCSSLink.ftl" at line 6, column 5]
----
com.coremedia.livecontext.contentbeans.ProductDetailPage
com.coremedia.blueprint.cae.contentbeans.PageImpl
com.coremedia.blueprint.common.contentbeans.Page
com.coremedia.blueprint.cae.contentbeans.AbstractPageImpl
com.coremedia.blueprint.common.contentbeans.AbstractPage
com.coremedia.blueprint.common.datevalidation.ValidityPeriod
com.coremedia.objectserver.dataviews.AssumesIdentity
java.lang.Object
com.coremedia.objectserver.view.ViewException: Error rendering view
at com.coremedia.objectserver.view.ViewUtils.rethrow(ViewUtils.java:344)
at com.coremedia.objectserver.view.freemarker.FreemarkerViewEngine$FreemarkerView.render(FreemarkerViewEngine.java:154)
at com.coremedia.objectserver.view.ExceptionHandlingViewDecorator$ExceptionDecorator.decorate(ExceptionHandlingViewDecorator.java:135)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:344)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:428)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:346)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:428)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:346)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:428)
at com.coremedia.objectserver.view.ExceptionHandlingViewDecorator$ExceptionDecorator.decorate(ExceptionHandlingViewDecorator.java:135)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:344)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:428)
at com.coremedia.objectserver.view.ViewUtils.render(ViewUtils.java:184)
at com.coremedia.objectserver.view.ViewUtils.render(ViewUtils.java:124)
at com.coremedia.objectserver.view.freemarker.impl.CAEFreemarkerFacadeImpl.include(CAEFreemarkerFacadeImpl.java:159)
at jdk.internal.reflect.GeneratedMethodAccessor279.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:1552)
at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:73)
at freemarker.core.MethodCall._eval(MethodCall.java:62)
at freemarker.core.Expression.eval(Expression.java:101)
at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:100)
at freemarker.core.DollarVariable.accept(DollarVariable.java:63)
at freemarker.core.Environment.visit(Environment.java:383)
at freemarker.core.Environment.visitAndTransform(Environment.java:514)
at freemarker.core.CompressedBlock.accept(CompressedBlock.java:42)
at freemarker.core.Environment.visit(Environment.java:383)
at freemarker.core.Environment.invokeMacroOrFunctionCommonPart(Environment.java:889)
at freemarker.core.Environment.invokeMacro(Environment.java:825)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
at freemarker.core.Environment.visit(Environment.java:347)
at freemarker.core.Environment.visit(Environment.java:353)
at freemarker.core.Environment.process(Environment.java:326)
at com.coremedia.objectserver.view.freemarker.FreemarkerViewEngine$FreemarkerView.render(FreemarkerViewEngine.java:150)
at com.coremedia.objectserver.view.freemarker.FreemarkerViewEngine$FreemarkerView.render(FreemarkerViewEngine.java:122)
at com.coremedia.objectserver.view.ExceptionHandlingViewDecorator$ExceptionDecorator.decorate(ExceptionHandlingViewDecorator.java:113)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:334)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:422)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:336)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:422)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:336)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:422)
at com.coremedia.objectserver.view.ExceptionHandlingViewDecorator$ExceptionDecorator.decorate(ExceptionHandlingViewDecorator.java:113)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:334)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:422)
at com.coremedia.objectserver.view.ViewUtils.render(ViewUtils.java:152)
at com.coremedia.objectserver.view.ViewUtils.render(ViewUtils.java:109)
at com.coremedia.objectserver.view.BeanView.renderMergedOutputModel(BeanView.java:63)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1401)
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1145)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1084)
at com.coremedia.objectserver.web.DispatcherServlet.doDispatch(DispatcherServlet.java:69)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:655)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at com.coremedia.livecontext.fragment.FragmentContextProvider.doFilter(FragmentContextProvider.java:71)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at com.coremedia.blueprint.cae.filter.PreviewViewFilter.doFilterInternal(PreviewViewFilter.java:48)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.AbstractRequestLoggingFilter.doFilterInternal(AbstractRequestLoggingFilter.java:289)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at com.coremedia.blueprint.cae.filter.SiteFilter.doFilter(SiteFilter.java:54)
at com.emerson.globalization.web.filter.VirtualSiteFilter.doFilter(VirtualSiteFilter.java:40)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at com.coremedia.livecontext.preview.PreviewMarkerFilter.doFilter(PreviewMarkerFilter.java:35)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at com.coremedia.blueprint.livecontext.ecommerce.filter.CommerceConnectionFilter.doFilter(CommerceConnectionFilter.java:44)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at com.coremedia.blueprint.cae.filter.SiteFilter.doFilter(SiteFilter.java:54)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:327)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:122)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:116)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:126)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:81)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:109)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:149)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:117)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:354)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:267)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at com.emerson.blueprint.component.cae.csrf.CsrfLegacyTokenGetterFilter.doFilterInternal(CsrfLegacyTokenGetterFilter.java:19)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at com.coremedia.blueprint.cae.filter.RequestRejectedExceptionFilter.doFilter(RequestRejectedExceptionFilter.java:41)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:769)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:890)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1787)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:
==> emr.getLinkCustomed [in template "jar:id:contentproperty:/Themes/emerson/templates/emerson-templates.jar/archive!/META-INF/resources/WEB-INF/templates/emerson/com.coremedia.blueprint.common.contentbeans/CMCSS.asCSSLink.ftl" at line 6, column 22]
----
Tip: It's the step after the last dot that caused this error, not those before it.
----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----
----
FTL stack trace ("~" means nesting-related):
- Failed at: #assign cssLink = emr.getLinkCustomed... [in template "jar:id:contentproperty:/Themes/emerson/templates/emerson-templates.jar/archive!/META-INF/resources/WEB-INF/templates/emerson/com.coremedia.blueprint.common.contentbeans/CMCSS.asCSSLink.ftl" at line 6, column 5]
----
at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
at freemarker.core.UnexpectedTypeException.newDescriptionBuilder(UnexpectedTypeException.java:85)
at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:63)
at freemarker.core.NonMethodException.<init>(NonMethodException.java:74)
at freemarker.core.MethodCall._eval(MethodCall.java:67)
at freemarker.core.Expression.eval(Expression.java:101)
at freemarker.core.Assignment.accept(Assignment.java:134)
at freemarker.core.Environment.visit(Environment.java:347)
at freemarker.core.Environment.visit(Environment.java:353)
at freemarker.core.Environment.visit(Environment.java:353)
at freemarker.core.Environment.process(Environment.java:326)
at com.coremedia.objectserver.view.freemarker.FreemarkerViewEngine$FreemarkerView.render(FreemarkerViewEngine.java:150)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:346)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:428)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:346)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:428)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:346)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:428)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingBaseView.render(ViewDecoratorBase.java:346)
at com.coremedia.objectserver.view.ViewDecoratorBase$DecoratingServletAndTextView.render(ViewDecoratorBase.java:428)
at com.coremedia.objectserver.view.ViewUtils.render(ViewUtils.java:184)
at com.coremedia.objectserver.view.ViewUtils.render(ViewUtils.java:124)
at com.coremedia.objectserver.view.freemarker.impl.CAEFreemarkerFacadeImpl.include(CAEFreemarkerFacadeImpl.java:159)
at jdk.internal.reflect.GeneratedMethodAccessor279.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:1552)
at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:73)
at freemarker.core.MethodCall._eval(MethodCall.java:62)
at freemarker.core.Expression.eval(Expression.java:101)
at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:100)
at freemarker.core.DollarVariable.accept(DollarVariable.java:63)
at freemarker.core.Environment.visit(Environment.java:383)
at freemarker.core.Environment.visitAndTransform(Environment.java:514)
at freemarker.core.CompressedBlock.accept(CompressedBlock.java:42)
at freemarker.core.Environment.visit(Environment.java:383)
at freemarker.core.Environment.invokeMacroOrFunctionCommonPart(Environment.java:889)
at freemarker.core.Environment.invokeMacro(Environment.java:825)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
at freemarker.core.Environment.visit(Environment.java:383)
at freemarker.core.IteratorBlock$IterationContext.executedNestedContentForCollOrSeqListing(IteratorBlock.java:321)
at freemarker.core.IteratorBlock$IterationContext.executeNestedContent(IteratorBlock.java:271)
at freemarker.core.IteratorBlock$IterationContext.accept(IteratorBlock.java:244)
at freemarker.core.Environment.visitIteratorBlock(Environment.java:657)
at freemarker.core.IteratorBlock.acceptWithResult(IteratorBlock.java:108)
at freemarker.core.IteratorBlock.accept(IteratorBlock.java:94)
at freemarker.core.Environment.visit(Environment.java:347)
at freemarker.core.Environment.visit(Environment.java:353)
at freemarker.core.Environment.process(Environment.java:326)
at com.coremedia.objectserver.view.freemarker.FreemarkerViewEngine$FreemarkerView.render(FreemarkerViewEngine.java:150)
... 163 more
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Fisher-P-whispertube

Fisher™ 6060 WhisperTube Modal Attenuator

Contact Sales

Product Description

The WhisperTube is a passive reactive silencer designed for installation downstream of the control valve or other equipment contributing to system noise. Requiring negligible pressure drop across the device, the WhisperTube achieves system noise reduction across a wide range of conditions without impacting the flow capacity or process.

Features

  • Broadband Noise Reduction — Patented design with internal acoustic cavities of varying sizes reduce noise across a broad range of frequencies.
  • Application Versatility — Designed for a wide range of fluid flow rates, pressures and temperatures. Reduce noise inside the pipe for all sources upstream. Pair the WhisperTube with any equipment used in compressible fluid service.
  • Maximize Flow Capacity — Negligible pressure drop across the WhisperTube other than the normally expected line loss for a pipe spool piece of equivalent length equates to noise attenuation with no impact on process flow.
  • Passive Reactive Silencer — Internal cavities produce acoustic wave reflections that reduce noise propagating downstream.
  • Reliable Performance — No internal acoustic packing material to fail from moisture absorption. Cast internal drain channel ensures any potential liquid buildup can be removed, ensuring optimum performance.
  • Compatible with Piggable Systems — Straight through flow geometry with inside diameter that matches the pipe accommodates pigging operations when required for cleaning and maintenance.
  • Sour Service Capability — NACE MR0103, MR0175 / ISO 15156 compliant materials of construction as standard for applications involving sour gas or vapor.
  • Quick and Easy Maintenance — Removeable cylindrical stainless steel screen for easy cleaning if required with no special tools needed.
  • Easy Installation — Threaded lifting provisions accommodate fitting the body with hoist rings or lifting eye bolts for optimized product control during installation.

Specifications

Body Sizes
NPS 2, 3, 4, 6, 8, 10 and 12
Critical Service
Noise abatement
End Connection Styles
CL150, CL300, or CL600 raised-face flanges compatible with ASME B16.5
Temperature Capability
-46 to 371°C (-50 to 700°F)

Documents & Drawings