Features
Function and Description
Quick-Release Bottom Drain Valves for Cryogenic Storage Tanks
PROTEGO® NB/AP In-Tank Valves are used in storage tanks for cryogenic liquids in order to seal Joint A seal prevents or limits unwanted transfer of product from one container to another. Seal is used as superordinate term for all types of sealing elements. off discharge lines in the event of an accident or emergency (pipe bursting). These devices meet the Requirements of API 625.
Tightness by a Lapped Metallic Valve Pallet and Relief Valve Cone
The device Appareil A device is a pipe component that influences the media flow by opening, closing, or partially shutting off the flow channel or by dividing or mixing the media flow. consists of the bottom plate Plaque de sol A bottom plate forms the foundation inside a tank for the installation of tank accessories, e. g. suction units or tank valves. (1) which has to be welded onto the vessel Récipient Container or structural envelope in which materials are processed, treated or stored. bottom; a nozzle (2) which has to be welded to the discharge line; the flanged fast-acting valve (3) with valve piston (4) and release valve cone (5); and the complete pneumatic actuating device (6) which is mounted onto the roof of the tank. The required tightness is ensured by a lapped metallic valve pallet Clapet Valve pallet is the generic term for the assembly that rests on the valve seat. and relief valve cone. The quick-release valve (3) and the actuating system (6) are connected by an actuator cable (7). An additional emergency cable enables the quick-release valve to be opened if the main actuator rope is damaged.
Fail-Safe-Concept
During normal operation, a pneumatic cylinder holds the valves in the open position. The pneumatic cylinder is actuated by a control line to lift Course Lift is the actual travel of the valve pallet from the main valve out of the closed position. the valve piston. The bottom valve is only closed in an emergency. In the event of an energy drop, the valve piston, due to its own weight, falls onto the valve seat Siège de soupape The valve seat is a component on which the valve pallet rests when the valve is closed. which closes the bottom valve.(Fail Safe Concept).
Customized Solutions for Specific Plant Requirements
The valve design is independent of the nominal size Diamètre nominal The nominal size is an alphanumeric designation of size for components in a piping system, used for reference purposes, comprising the letters DN followed by a dimensionless integer that is indirectly related to the physical size of the bore or outside diameter of the connections, expessed in millimeters. . The nominal size DN 1 is determined by the nominal size of discharge line. Material selection depends on the substance and the operating temperature Operating temperature Temperature reached when the equipment is operating under design conditions. .
Dimensions
| DN 1 | DN 2 | a | b | c | d | e | f | Hub |
| 150 / 6" | 80 / 3" | 200 / 7.87 | 1130 / 44.49 | 1430 / 56.30 | 550 / 21.65 | 175 / 6.89 | 465 / 18.31 | 160 / 6.30 |
| 200 / 8" | 80 / 3" | 200 / 7.87 | 1130 / 44.49 | 1430 / 56.30 | 600 / 23.62 | 175 / 6.89 | 470 / 18.50 | 160 / 6.30 |
| 250 / 10“ | 80 / 3" | 200 / 7.87 | 1130 / 44.49 | 1430 / 56.30 | 740 / 29.13 | 175 / 6.89 | 485 / 19.09 | 160 / 6.30 |
Dimensions in mm / inches
Material of fast action bottom drain valve
| Bottom plate with nozzle | * |
| Valve housing Corps A housing is a solid shell, which surrounds a content, either protecting the content from external influences, or protecting the environment from the content. with valve cone | Stainless Steel |
| Gasket | * |
| Actuator rope | Stainless Steel |
* upon request
Material
| Housing | Stainless Steel |
| Actuator spindle | Stainless Steel |
| Guide bushing | Copper |
| Gasket | PTFE |
| Protective cap | Stainless Steel |
| Pneumatic cylinder | Aluminium |
Flange connection type
| EN 1092-1, Form B, PN 40 or upon request |
Data Necessary for Specification
Stored mediumOperating temperature T (°C or °F)
Operating pressure p (bar or psi)
Connection size DN 1
Tank height (m or ft)
Selection and Design
The main process data and product properties of the stored medium as well as the temperature of the stored product determine the material for the specific valve. Subsequently the nominal diameter and the type of connection are checked and selected.
The in-tank valve In-tank valve An in-tank valve is located inside a storage tank and is open under normal working conditions. is available in nominal diameters of DN 150 mm / 6"and DN 200 mm / 8", whereas the connection for the pneumatic actuating device has a nominal diameter of DN 80 mm / 3".
The length of the actuator rope and of the emergency rope is determined by the height of the tank. The final adjustment is completed during installation. The material for the gasket is determined based on the operating conditions and/or other special requirements.
The material of the valve bottom plate needs to be compatible to the material of the tank bottom plate. If the material of the bottom plate is provided by the tank manufacturer, then close coordination between manufacturing planning and installation planningis necessary.
For special requirements the valve and the actuation system (e.g. with inductive position indicator) can be supplied with a special design.
Deviations from our standard design will be sized and specified with the support of our engineers for the specific application.
