Method and a sampling assembly for taking a representative fluid

Measuring and testing – Sampler – sample handling – etc. – Conduit or passageway section capture chamber

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Details

G01N 100

Patent

active

053700058

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

A problem encountered in connection with the collection and purity control of samples from pressurized liquid systems, such as hydraulic and central lubricating systems, is to obtain representative samples for verifying the particle purity of a sample in a particle counter or microscope. Frequently the sampling bleed orifice and valves have to be purged for a considerable time before the sample is representative. Also, current methods frequently cause considerable oil spillage since, in order to be representative, a sample requires up to half an hour of purging through the sampling bleed orifice. Further, during opening and closing of sampling bleed valves on the pressure side of the liquid system, the sample is contaminated by particles liberated in such valves.
DE 3 927 020 A1 discloses a rather complicated sampling device for taking samples of toxic or noxious fluids in a circulation system. The sampler includes a sampling container which may be of a pressure resistent type if the fluid is under pressure in the circulation system. The fluid may be caused to flow from the circulation system into the sampler via a bleed valve to be closed when the sampler has been filled as desired. Since the opening as well as the closing of the bleed valve will result in microscopic extraneous matter entrained in the fluid flowing into the sampler, this prior device would be entirely impracticable in verifying the purity of the liquid circulating in the system. Furthermore, a pressure resistant container would be expensive.
Also exemplary of the prior art is GB-2 222 675 A disclosing a relatively complex device for taking samples of a radioactive flowing liquid. The liquid is discharged into a sampling flask by utilizing the venturi effect, and the discharge ceases automatically when the sampling flask is removed from the flow system. However, the device cannot be used on pressurized fluids.


SUMMARY OF THE INVENTION

The object of the present invention is to solve the problem of how to provide a fluid sample from a system of pressurized fluid in such a manner that the sample is practically 100% representative, as to purity, of the fluid in the system.
This object is achieved through a method and a sampling assembly as defined below. Thus, the invention eliminates the risk of contamination of the fluid sample as a result of the sampling operation itself. In, the invention permits the use of inexpensive standard glass or plastics bottles for containing the sample, even when the fluid in the fluid system is working under high pressures.
The invention is applicable to all types of pressurized fluid systems, but is primarily intended for lubricating oil systems in connection with heavy machinery in processing industries, rolling mills, bearings for rolls in paper mills and shafts in ship propulsion plants, important hydraulic plants etc. Although the invention is primarily intended for taking liquid samples it may just as well be applied to gases.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention is described below with reference to the drawings in which
FIG. 1 is a plan view of a possible embodiment of a sampling assembly according to the invention,
FIG. 2 is a longitudinal section taken along line II--II in FIG. 1 and
FIG. 3 is a section similar to FIG. 2 but illustrating a somewhat modified embodiment.


DETAILED DESCRIPTION OF THE INVENTION

In the drawings reference numeral 1 generally denotes a sampler or sampling assembly associated with a circulating pressurized fluid system S the fluid of which is to be controlled. For example, the fluid could be the oil in a machinery pressurized lubricating system. The assembly 1 comprises a pressure chamber 2 designed to resist a pressure at least as high as the pressure of the fluid system S. In the example shown pressure chamber 2 consists of a cylindrical lower body 4 releasably and sealingly connected to an upper body 6, e.g. by means of threads 8 and sealing ring 10. The upper body 6 is provided with an inlet 12 and outlet 14 each connected to

REFERENCES:
patent: 3798972 (1974-03-01), Collins, Jr.
patent: 4683761 (1987-08-01), Stock
patent: 4744256 (1988-05-01), Niskin

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