Rapid Opening Closures for Pipelines


Able to be opened or closed by a single operator in less than one minute, the large Rapid Opening Closure (ROC) provides internal access to pipelines and any type of pressure vessel for critical service and maintenance activities and can be installed on both horizontal and vertical vessels.


The ease of operation is combined with a high level of security and operator safety, which includes a pressure warning device that is interlocked to the ROC operating mechanism preventing the door from being opened until the vessel has been completely depressurized. Consequently, the ROC reduces pressure vessel downtime and associated lost production to an absolute minimum, resulting in more efficient utilization of both plant and labor.


Pipeline Engineering uses Finite Element Analysis design methodology to calculate optimum material sizes and weights for all key components ensuring the most economical design solutions are achieved. This is particularly important for large ROC sizes, which can be designed to suit customer-specific designs, including intermediate design pressures rather than follow generic standard flange full pressure class 600#, 900#, 1500#, etc.


With the recently expanded “North American Pipeline and Hazardous Materials Safety Administration Mega Rule” regulation in the USA and the “DIN SPEC 91406 industrial standard” (Automatic Identification of Physical Objects and Information on Physical Objects in IT Systems, Particularly IoT Systems) in Germany, having the necessary data for products like the CIRCOR Rapid Opening Closures is now considered a crucial path for operators. With CIRCORSmart, accessing the info you need has never been easier. 


Using QR codes and NFC technology, CIRCORSmart accesses essential and specific product data almost instantly. With the CIRCORSmart app, you’ll have access to: ›

  • Product-specific instruction manuals
  • FAQ and troubleshooting tips
  • Instructional videos
  • Spare part requests
  • Material records
  • The expertise of product specialists
  • Track maintenance on each product
  • Take detailed notes
  • Attach photos and important files


  • Quick to open and close in less than a minute
  • Safe operation under any conditions
  • Robust design
  • Fully approved by most severe, offshore specifications and preferred by main operators 
  • Available for horizontal, vertical or included installation.
  • 270-deg. swing on the door
  • Simple and easily changed seal for quick maintenance.


BRANDPipeline Engineering
TYPEPipeline Pigging - Quick Opening Closure
PRESSURE CLASS#150 to #2500
MATERIALSWide range of Carbon Steels and Duplex materials
SIZES6 to 72 in.

ASME U Stamp / ASME U2 Stamp. PED/CE Marking. NORSOK

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