NO143873B

NO143873B - R EQUIPMENT FOR HAZARDOUS AND EXPLOSIVE LIQUID

Info

Publication number: NO143873B
Application number: NO780023A
Authority: NO
Inventors: Olav Axelsen
Original assignee: Olav Axelsen
Priority date: 1978-01-03
Filing date: 1978-01-03
Publication date: 1981-01-19
Also published as: SE420478B; SE7813429L; FI62802B; NO780023L; GB2012236A; NO143873C; DK279A; FI784026A; GB2012236B; FI62802C

Description

Foreliggende oppfinnelse angår en anordning ved beholdere for ildsfarlige og eksplosive væsker fremstilt av elektrisk isolerende materiale. Til f.eks. bensinkanner av plast stilles det strenge krav til sikkerhet når det gjelder utladning av elektrostatiske ladninger som plastmaterialet under visse betingelser kan få. Det har vist seg at utladninger må ha et energiinnhold over en viss grense for at antennelse av f.eks. bensin eller bensindamp skal finne sted. Denne utladning foregår mellom utsiden av beholderen eller kannen og ett eller annet tilstøtende legeme som er elektrisk ledende. The present invention relates to a device for containers for flammable and explosive liquids made of electrically insulating material. For e.g. plastic petrol cans are subject to strict safety requirements when it comes to the discharge of electrostatic charges that the plastic material can acquire under certain conditions. It has been shown that discharges must have an energy content above a certain limit for ignition of e.g. gasoline or gasoline vapor must take place. This discharge takes place between the outside of the container or jug and one or another adjacent body that is electrically conductive.

Ved en bestemt avstand mellom beholderen og det nevnte legeme vil utladning av den elektrostatiske ladning i beholderens materiale finne sted, og inneholder utladningen tilstrekkelig energi kan antennelse og eksplosjoner oppstå. At a certain distance between the container and the aforementioned body, a discharge of the electrostatic charge in the container's material will take place, and if the discharge contains sufficient energy, ignition and explosions can occur.

Formålet med foreliggende oppfinnelse er derfor i første rekke å komme frem til en anordning ved en beholder av den beskrevne art, der energiinnholdet i enhver teoretisk mulig utladning blir liggende under den kritiske grense for antennelse. The purpose of the present invention is therefore primarily to arrive at a device for a container of the type described, where the energy content of any theoretically possible discharge is below the critical limit for ignition.

I henhold til oppfinnelsen er dette gjort ved at beholderens overflate er delt opp i flate stykker som er så små According to the invention, this is done by dividing the surface of the container into flat pieces that are so small

at den elektrostatiske energi i en utladning fra ett av flatestykkene er for liten til antennelse av de brennbare og eks-plosjonsfårlige væsker og gasser. Det forutsettes da at bare ett flatestykke om gangen kan komme i slik stilling overfor det tilstøtende legeme at utladning kan finne sted. that the electrostatic energy in a discharge from one of the flat pieces is too small to ignite the flammable and explosive liquids and gases. It is then assumed that only one flat piece at a time can come into such a position opposite the adjacent body that discharge can take place.

En foretrukken utførelsesform for en beholder A preferred embodiment of a container

ifølge oppfinnelsen har en kombinasjon av plane og krumme flater eller bare krumme flater, der man har valgt en slik form på de krumme flater at det i høyeste grad er usannsynlig at de krumme flater noen gang vil komme i en slik stilling i forhold til en tilsvarende krum flate på det ledende eller jordkoplede legeme at utladning kan finne sted. according to the invention has a combination of flat and curved surfaces or only curved surfaces, where such a shape has been chosen for the curved surfaces that it is highly unlikely that the curved surfaces will ever come into such a position in relation to a corresponding curved surface on the conducting or earthed body that discharge can take place.

Plastmaterialet som anvendes i beholderen er elektrisk isolerende slik at de elektrostatiske ladninger som måtte oppstå ikke forflytter seg i materialet, og det har vist seg at fordi plastmaterialer som vanligvis anvendes i beholderen, f.eks. polyetylen, må all den elektriske energi i en flate på mer enn 60 cm 2 utlades for at antennelse skal skje. Et karakteristisk trekk ved oppfinnelsen er derfor også at hvert av de plane flatestykker er mindre enn 60 cm 2, The plastic material used in the container is electrically insulating so that the electrostatic charges that may arise do not move in the material, and it has been shown that because plastic materials that are usually used in the container, e.g. polyethylene, all the electrical energy in an area of more than 60 cm 2 must be discharged for ignition to occur. A characteristic feature of the invention is therefore also that each of the flat surface pieces is less than 60 cm 2,

hvorved energien i utladningen blir for lav. whereby the energy in the discharge becomes too low.

Hvis det er ønskelig å forsyne de plane flatestykker med forsenkede detaljer skal disse ligge dypere i flatestykket enn den nevnte kritiske avstand ved hvilken utladning finner sted, spesielt hvis summen av arealet av flatestykket og arealet av de forsenkede detaljer overstiger 60 cm 2. If it is desirable to provide the flat surface pieces with recessed details, these must lie deeper in the surface piece than the mentioned critical distance at which discharge takes place, especially if the sum of the area of the surface piece and the area of the recessed details exceeds 60 cm 2.

Claims

1. Device for reducing spark discharges of static electricity at containers for flammable and explosive liquids made of electrically insulating material, where the container wall comprises flat surface pieces, a combination of flat and curved surface pieces or only curved surface pieces with shapes that deviate from the shape of the bodies is likely that the container can come into contact with, characterized by the surface pieces being so small that the energy in an electrostatic charge a surface piece can contain is too small to ignite the liquid or vapor of this liquid the container contains by electrical discharge, and by surface pieces that lie flush with each other are separated by grooves whose depth is greater than the distance between a surface piece and an associated body at which discharge takes place.

2. Device as specified in claim 1, characterized in that each of the surface pieces (curved or flat) 2 is less than approx. 60 cm.

3. Device for a container for flammable and explosive liquids as specified in claim 1 or 2, characterized in that the flat surface pieces have recessed or raised details that lie deeper in the surface piece or protrude more from it than the critical distance at which discharge takes place.

4. Device for containers for flammable and explosive liquids as specified in claims 1 and 3, characterized in that each of the aforementioned curved and/or flat surface pieces has less than approx. 60 cm 2 flat lying contiguous in the same plane.