US3279647A - Membrane-type safety device - Google Patents

Membrane-type safety device Download PDF

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Publication number
US3279647A
US3279647A US411929A US41192964A US3279647A US 3279647 A US3279647 A US 3279647A US 411929 A US411929 A US 411929A US 41192964 A US41192964 A US 41192964A US 3279647 A US3279647 A US 3279647A
Authority
US
United States
Prior art keywords
diaphragm
rod
bar
rotating bar
lever
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US411929A
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English (en)
Inventor
Adrianus Van Dop
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell USA Inc
Original Assignee
Shell Oil Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shell Oil Co filed Critical Shell Oil Co
Application granted granted Critical
Publication of US3279647A publication Critical patent/US3279647A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
    • F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs

Definitions

  • the invention relates to a safety device of the frangible diaphragm type, which prevents the pressure in a vessel from rising above or falling below a certain value.
  • frangible diaphragms have been used to protect these tanks. Means are provided for breaking the frangible diaphragm when the pressure varies from the set value. While the use of frangible diaphragms is a satisfactory solution past equipment required the use of two diaphragms if the storage tank was to be protected against both under and over pressures.
  • This invention solves the problem of breaking the frangible diaphragm by providing a mechanism that responses to either under or over pressure within the tank.
  • the pressure responsive mechanism releases a rotatable bar that free falls to break the frangible diaphragm.
  • the mechanism includes a chamber that is divided by a diaphragm with the diaphragm being subject to the vessel pressure on one side and atmospheric pressure on the opposite side. The movement of the diaphrgam is used to release a latch that holds the rotatable bar in a vertical position. When the bar is released it falls by gravity and breaks the frangible diaphragm.
  • the drawing is a vertical section of the safety device.
  • Reference numeral 1 designates the upper wall of a vessel, for example, a storage tank for petroleum products that is to protected against excessive changes in pressures.
  • the interior 2 of the vessel is provided with a passageway 3 which communicates with the atmosphere, and is sealed by a frangible diaphragm 4 made of a suitable material such as, for example, plastic film, metal or glass.
  • the passageway 3 may, for example, be the manhole of the tank.
  • the frangible diaphragm 4 is clamped between a flange 5 and a ring 6 with the ring being secured against the flange 5 by means of bolts (not shown).
  • An outwardly projecting support plate 7 bearing an upwardly projecting post 8 is secured to the flange 5 by any desired means such as welding or the like.
  • a pin or spindle 9 fitted to the element 8 provides a support for the rotable bar 10.
  • the bar 10 is adapted to rotate around the pin or spindle 9 with the bar 10 being provided with a cutting edge 11.
  • Weight the bar 10 may be desirable to Weight the bar 10 to insure that it will generate suflicient force to fracture the diaphragm 4.
  • the element 8 and the bar 10 are preferably made of corrosion-resistant material, for example, stainless steel or a molded plastic.
  • the support plate 7 is provided with an actuating means 12.
  • the actuating means 12 is a diaphragm type and consists of a closed chamber 13, which is divided into two chambers, 14 and 15, by a diaphragm 16. Chamber 14 communicates with the atmosphere by means of a vent 30 and chamber 15 communicates with the interior of the vessel 2 through a line 17.
  • a plate 18 and a rod 19 are secured to the center of the diaphragm 16 by means of a bolt or the like. The free end 20 of the rod 19 is close to or contacts the right side of the rotable bar 10.
  • a lever 21 is rotatably secured to the rod 19 by means of a pin 22. The lever 21 has an L shape with its free end 26 being close to or contacting the rotatable bar 10.
  • a pin 23 is rigidly secured to the wall of the chamber 13 and lies in the plane of the lever 21.
  • a second pin 24 is likewise rigidly secured to the wall of the chamber 13 and is provided with a ball shaped end 31.
  • a spring latch 25 secured to the rotatable bar 10 co-operates with the ball shaped end of the pin 24 to retain the rotatable bar in a vertical position.
  • the safety device described operates as follows:
  • the pressure in the vessel 2 tends to exceed the maximum permissible value.
  • the pressure is transferred to the chamber 15 through the line 17.
  • the pressure acts on the diaphragm 16 and causes an elastic deformation thereof so that the rod 19 moves axially to the left and the free end 20 dislodges the rotatable bar 10 out of its vertical position.
  • the bar 10 rotates to the left and ruptures or fractures the frangible diaphragm 4 with its cutting edge 11, thereby establishing communication between the interior 2 of the vessel and the atmosphere.
  • the rod 19 will move to the right.
  • the free end 26 of the L-shaped lever 21 is moved to the left and dislodges the rotatable bar 10 out of its vertical position.
  • the bar 10 rotates to the left and ruptures the frangible diaphragm 4 with its cutting edge 11, thereby establishing communication between the interior 2 of the vessel and the atmosphere.
  • the bar 10 When the bar 10 has ruptured the frangible diaphrgam 4, the bar is in a substantially horizontal position so that from a distance it can be seen that the device has operated and that the frangible diaphragm 4 should be replaced.
  • the bar 10 When the damaged diaphragm 4 has been replaced by a new one, the bar 10 is restored to its original substantially vertical position or position of rest.
  • a safety device of the frangible diaphragm type that prevents the pressure in a vessel from rising above or falling below a predetermined value comprising:
  • a frangible diaphragm said diaphragm being disposed to seal a passageway between the interior of said vessel and the atmosphere;
  • a rotating bar said bar being rotatably mounted adjacent said diaphragm and normally retained in a vertical position, said bar in addition falling to a horizontal position to rupture said diaphragm When dislodged from said vertical position;
  • an actuating means including a closed chamber having a diaphragm disposed therein to divide said closed chamber into first and second chambers, said first chamber communicating with said vessel and said second chamber communicating with the atmosphere;

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
US411929A 1963-11-20 1964-11-17 Membrane-type safety device Expired - Lifetime US3279647A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL300717 1963-11-20

Publications (1)

Publication Number Publication Date
US3279647A true US3279647A (en) 1966-10-18

Family

ID=19755224

Family Applications (1)

Application Number Title Priority Date Filing Date
US411929A Expired - Lifetime US3279647A (en) 1963-11-20 1964-11-17 Membrane-type safety device

Country Status (2)

Country Link
US (1) US3279647A (de)
NL (1) NL300717A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2412771A1 (fr) * 1977-12-20 1979-07-20 Messerschmitt Boelkow Blohm Dispositif de securite par eclatement destine a limiter la pression d'un fluide dans un reservoir a l'aide d'une membrane claquable
DE3310782C1 (de) * 1983-03-24 1984-07-19 Siemens AG, 1000 Berlin und 8000 München Sicherheitseinrichtung gegen unzulaessigen Druck in einem Behaelter
EP2052176A2 (de) * 2006-08-17 2009-04-29 Fike Corporation Überdruckablassstruktur mit stahlfeder-wiederverschlusstafel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304417A (en) * 1940-03-06 1942-12-08 Walden W Mason Safety device for low pressure vessels
US2514147A (en) * 1941-05-02 1950-07-04 Phillips Petroleum Co Portable liquefied gas container
US2788794A (en) * 1954-06-01 1957-04-16 American Cyanamid Co Gas loaded safety disks

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304417A (en) * 1940-03-06 1942-12-08 Walden W Mason Safety device for low pressure vessels
US2514147A (en) * 1941-05-02 1950-07-04 Phillips Petroleum Co Portable liquefied gas container
US2788794A (en) * 1954-06-01 1957-04-16 American Cyanamid Co Gas loaded safety disks

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2412771A1 (fr) * 1977-12-20 1979-07-20 Messerschmitt Boelkow Blohm Dispositif de securite par eclatement destine a limiter la pression d'un fluide dans un reservoir a l'aide d'une membrane claquable
DE3310782C1 (de) * 1983-03-24 1984-07-19 Siemens AG, 1000 Berlin und 8000 München Sicherheitseinrichtung gegen unzulaessigen Druck in einem Behaelter
EP0120380A1 (de) * 1983-03-24 1984-10-03 Siemens Aktiengesellschaft Sicherheitseinrichtung gegen unzulässigen Druck in einem Behälter
US4476991A (en) * 1983-03-24 1984-10-16 Siemens Aktiengesellschaft Pressurizable container having a safety device for releasing excessive container pressure
EP2052176A2 (de) * 2006-08-17 2009-04-29 Fike Corporation Überdruckablassstruktur mit stahlfeder-wiederverschlusstafel
EP2052176A4 (de) * 2006-08-17 2011-10-05 Fike Corp Überdruckablassstruktur mit stahlfeder-wiederverschlusstafel

Also Published As

Publication number Publication date
NL300717A (de) 1900-01-01

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