VAREC SERIES EMERGENCY PRESSURE RELIEF MANWAY COVERS The Series is designed to provide emergency venting of low pressure storage tanks and vessels FEATURES P PV Available in emergency pressure only and emergency pressure and vacuum relief models. Cast metal cover provides added strength and extended life. Hinged cover provides a fixed pivot point, ensures proper reseating and added safety. Cover cannot separate from the base. Easily lifted open to provide a large, unobstructed passage for easy tank access. PV incorporates a spring loaded vacuum relief valve integral to the cover assembly. Weather hood and screen provided for protection. Non-metallic seat insert on the pallet minimizes leakage. Durable reinforced fabric diaphragm type pressure side seating surface backed by compressible, cellular non-metallic pads for added cushion and reduced leakage. Optional materials available to suit most chemical applications. GENERAL APPLICATION Series manways protect tanks against costly rupture or implosion. The P provides emergency pressure relief only with vacuum relief supplied by a separate breather valve. The PV provides both pressure and vacuum relief. TECHNICAL DATA Materials: Carbon steel, aluminum, stainless steel Sizes:, 0, (0, 00, 00 mm) Connections: Drilled flange to API 0 or ANSI # Pressure settings: ½ to oz/in ( to kg/m ) Vacuum settings: ½ to oz/in ( to kg/m ) Emerson.com/FinalControl 0 Emerson. All Rights Reserved. VCTDS-00-EN /0
VAREC SERIES EMERGENCY PRESSURE RELIEF MANWAY COVERS SPECIFICATIONS Sizes, 0, Connections Drilled to API 0 dimensions, flat face flange - standard Drilled to ANSI # dimensions, flat face flange - optional Special flange drilling requirements to DIN, JPI or JIS standards are available upon request. Consult your local sales representative for further details. Setting ranges Pressure See table below Vacuum ½ oz/in to oz/in Materials of construction Base Carbon steel with stainless steel seating surface - standard Aluminum - optional Stainless steel - optional Cover Diaphragm and pads Low copper aluminum cover with carbon steel hinge arm - standard Carbon steel cover with carbon steel hinge arm - optional Stainless steel cover with 0 stainless steel hinge arm - optional NBR diaphragm with Neoprene pads - standard PTFE diaphragm with Neoprene pads - optional FKM diaphragm with FKM pads - optional Vacuum insert (PV only) NBR - standard PTFE - optional FKM - optional Vacuum pallet assembly (PV only) Aluminum - standard Stainless steel - optional Hardware Spring retainer, cotter pin, sleeve, hinge pin, cap screws, nuts and washers - 0 Stainless steel PRESSURE SETTING CODES* Below min. (counterweighted) - code 0 Min. - code Above min. - code Extra heavy - code P PV Alum trim PV SS trim P PV Alum trim PV SS trim P PV Alum trim PV SS trim P PV Alum trim PV SS trim Size Cover material oz/in oz/in oz/in oz/in oz/in oz/in oz/in oz/in oz/in oz/in oz/in oz/in Aluminum 0. -.0 0. -. 0. -..0...0 -.0. -.. -..0 -.0. -.0. -.0 Carbon steel or. -. -. -.. -.. -.0 -. -.0 - - - Stainless steel 0 Aluminum 0. -.0 0. -. 0. -..0...0 -.0. -.. -..0 -.0. -.0. -.0 0 Carbon steel or. -. -.0 -.. -.. -.0 -. -.0 - - - Stainless steel Aluminum 0. -.0 0. -. 0. -..0...0 -.0. -.. -..0 -.0. -.0. -.0 Carbon steel or Stainless steel.0 -. -. -.. -.. -.0 -. -.0 - - - NOTE * For higher pressure settings see technical product data sheet for Figure A (VCTDS-000) or contact your sales representative.
VAREC SERIES EMERGENCY PRESSURE RELIEF MANWAY COVERS DIMENSIONS PARTS Item Description Base assembly Cover Cover ring Cover pad Diaphragm Hinge arm assembly Hinge pin Loading weight Weight mtg stud/assembly Vacuum hood [] Vacuum pallet [] Vacuum spring [] B A Vacuum spring retainer [] Vacuum stem [] Vacuum post [] Vacuum screen [] Vacuum seat insert [] Vacuum insert retainer [] No vacuum opening for P (see note ) Counter weight assembly [] NOTES. Used only for the PV vacuum port.. Used only for the 'below minimum' pressure range. DETAIL A Enlarged SST 0 Tip (STL base only) DETAIL B Enlarged
VAREC SERIES EMERGENCY PRESSURE RELIEF MANWAY COVERS DIMENSIONS Specifications, inches (mm) Counterweight assembly [] (Reference) øa øc (B. C.) øb () Nom Counterweight assembly [] (Reference) øa øc (B. C.) øb ¼ () Nom DRILLED FOR API 0 FLANGE Size code 0 Nominal pipe size (0) 0 (00) (00) A ½ (0) 0½ () ½ () B () (0) 0 () C ½ () ½ () ½ () Diameter of holes ⅝ () ¾ () ¾ () No. of holes 0 DRILLED FOR ANSI # FLANGE (optional) Size code 0 Nominal pipe size (0) 0 (00) (00) A ½ (0) 0½ () ½ () B () ½ () () C ¾ () () ½ () Diameter of holes ¼ () ¼ () ⅜ () No. of holes 0 0 NOTES. For pressure setting code 0 only.. Installation, mounting arrangement and dimensions are preliminary general information not to be used for construction. Certified drawings are available upon request.
VAREC SERIES EMERGENCY PRESSURE RELIEF MANWAY COVERS FLOW CAPACITY P/PV relief manway cover pressure relief Tank pressure Inches of water 0 0 0 0 00 00 000 000 000 0 0 0 0 0 0 0 0 00 00 00 00 00 00 00 000 000 000 000 000,000 0 Ounces per square inch 0. 0. 0. 0 0 0 0 0 0 0 0 00 00 00 00 00 00 00 000 000 000 000 000,000 0 00 00 000 000 000 Thousands of cubic feet/hour at 0 F and. psia, air flow (SCFH) 0. 0 P/PV relief manway cover pressure relief Tank pressure Inches of water 0 0 0 0 00 00 000 000 000 0 0 0 0 0 0 0 0 00 00 00 00 00 00 00 000 000 000 000 000,000 0 Ounces per square inch 0. 0. 0. 0. 0 0 0 0 0 0 0 0 00 00 00 00 00 00 00 000 000 000 000 000,000 0 00 00 000 000 000 Thousands of cubic feet/hour at 0 F and. psia, air flow (SCFH)
VAREC SERIES EMERGENCY PRESSURE RELIEF MANWAY COVERS FLOW CAPACITY P/PV relief manway cover pressure relief Tank pressure Inches of water 0 0 0 0 00 00 000 000 000 0 0 0 0 0 0 0 0 00 00 00 00 00 00 00 000 000 000 000 000,000 0 Ounces per square inch 0. 0. 0. 0 0 0 0 0 0 0 0 00 00 00 00 00 00 00 000 000 000 000 000,000 0 00 00 000 000 000 Thousands of cubic feet/hour at 0 F and. psia, air flow (SCFH) 0., 0, and P/PV relief manway cover vacuum relief 0. 0. 0. 0 00 00 000 000 000 0 0 0 0 0 0 0 0 00 00 00 00 00 00 00 000 000 000 000 000,000 0. Tank vacuum Inches of water 0 0 0 0 Ounces per square inch 0 0 0 0 0 0 0 0 00 00 00 00 00 00 00 000 000 000 000 000,000 0 00 00 000 000 000 Thousands of cubic feet/hour at 0 F and. psia, air flow (SCFH)
VAREC SERIES EMERGENCY PRESSURE RELIEF MANWAY COVERS ORDERING INFORMATION - PRESSURE AND VACUUM SELECTION GUIDE Example: 0 PV B Model Emergency pressure and vacuum relief manway cover Size " 0 0" " Materials of construction Base Cover Vacuum trim PV Carbon steel Aluminum Aluminum PV Carbon steel Aluminum Stainless steel PV Aluminum Aluminum Aluminum PV Aluminum Aluminum Stainless steel PV Carbon steel Carbon steel Stainless steel PV Stainless steel Stainless steel Stainless steel Diaphragm/cover pads/vacuum insert B NBR/Neoprene/NBR T PTFE/Neoprene/PTFE V FKM/FKM/FKM Base flange drilling API 0 ANSI # Pressure setting 0 Below minimum (counterweighted) Minimum (standard) Above minimum Extra heavy Example: 0" Emergency pressure and vacuum relief manway cover with carbon steel base, aluminum cover, aluminum trim, NBR diaphragm and vacuum insert, API 0 drilling, minimum setting. Specify pressure and vacuum settings when ordering.
VAREC SERIES EMERGENCY PRESSURE RELIEF MANWAY COVERS ORDERING INFORMATION - PRESSURE ONLY SELECTION GUIDE Example: 0 P0 B Model Emergency pressure relief manway cover Size " 0 0" " Materials of construction Cover P0 Carbon steel/aluminum P0 Carbon steel/aluminum P0 Carbon steel/carbon steel P0 Stainless steel/ Stainless steel Diaphragm/cover pads B NBR/Neoprene T PTFE/Neoprene V FKM/FKM Base flange drilling API 0 ANSI # Pressure setting 0 Below minimum (counterweighted) Minimum (standard) Above minimum Extra heavy Example: 0" emergency pressure relief manway cover, carbon steel base with aluminum cover and NBR diaphragm, API 0 drilling, minimum setting. Specify pressure setting when ordering.