CA1177280A - Pressure transducer body - Google Patents
Pressure transducer bodyInfo
- Publication number
- CA1177280A CA1177280A CA000407508A CA407508A CA1177280A CA 1177280 A CA1177280 A CA 1177280A CA 000407508 A CA000407508 A CA 000407508A CA 407508 A CA407508 A CA 407508A CA 1177280 A CA1177280 A CA 1177280A
- Authority
- CA
- Canada
- Prior art keywords
- pressure transducer
- bore
- fluid
- pressure
- transducer body
- 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
Links
- 239000012530 fluid Substances 0.000 claims abstract description 50
- 230000006854 communication Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 9
- 238000009530 blood pressure measurement Methods 0.000 abstract 1
- 230000000638 stimulation Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 5
- 229920001971 elastomer Polymers 0.000 description 4
- 239000005060 rubber Substances 0.000 description 4
- 238000011068 loading method Methods 0.000 description 3
- 239000013536 elastomeric material Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 150000003673 urethanes Chemical class 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A pressure transducer body is described which has a bore running its length and contains (a) a means for receiving a pressure transducer, (b) a fluid reservoir, (c) a stationary elastic plug member having embedded therein a T-shaped rigid pin member, and (d) a chamber for receiving a fluid under pressure. The elements of the transducer body are combined in such a way that fluids under pressure in chamber (d) are accurately measured using a conventional pressure transducer even at very high pressures (e.g., 20,000 psi). The transducer body permits accurate pressure measurements on pressurized fluids which are corrosive and/or abrasive. The pressure service industries for measuring the pressure of acidizing or hydraulic fracturing fluids used in stimulation.
A pressure transducer body is described which has a bore running its length and contains (a) a means for receiving a pressure transducer, (b) a fluid reservoir, (c) a stationary elastic plug member having embedded therein a T-shaped rigid pin member, and (d) a chamber for receiving a fluid under pressure. The elements of the transducer body are combined in such a way that fluids under pressure in chamber (d) are accurately measured using a conventional pressure transducer even at very high pressures (e.g., 20,000 psi). The transducer body permits accurate pressure measurements on pressurized fluids which are corrosive and/or abrasive. The pressure service industries for measuring the pressure of acidizing or hydraulic fracturing fluids used in stimulation.
Description
~772~}0 PRESSURE TRANSDUCER BODY
This invention pertains to a new pressure transducer body and, in particular, to a pressure transducer body adapted for use in measuring pressures of corrosive and/or abrasive fluids subject to pulsating pessure loadings.
There are a variety of transducer bodies known in the art. For transducer bodies that might be subject to heavy pulsating types of loading, the most commonly used device contains a diaphragm with a hydraulic liquid separating the diaphragm and a recording pressure transducer. This type of transducer body has problems with rupture of the diaphragm due to pulsations or loss of hydraulic fluid which allows the diaphragm to deform excessively.
Another type of transducer body has been a piston type in which a hydraulic liquid is located between the pressure transducer and the piston. Again, under operating conditions the heavy pulsating types of loading usually causes fluid leak off and permits the piston to "bottom out" against -the transducer. This results in inaccurate and unreliable readings.
29,626-F -l-1~772~0 ~ ore specifically, the present invention resides in a pressure transducer body having a first end and a second end defining a bore which extends from the first to the second end, and having (a) means for receiving a pressure transducer, (b) a fluid reservoir, (c) a stationary elastic plug member having embedded therein a T-shaped rigid pin member, and (d) a chamber for receiving a fluid under pressure;
said means for receiving the pressure transducer being located adjacent the first end of said transducer body and in fluid communication with the ~luid reservoir, said fluid reservoir being defined within the bore of the transducer body and being located between said means for receiving the pressure transducer and the plug member, said plug member having a first end in fluid communication with the fluid reservoir and a second end adjacent to the chamber for receiving a fluid under pressure, said chamber being defined withir. said bore, said plug member having a rigid pin member embedded therein; said pin member being defined by an elongate shaft extending substantially through the plug member and positioned coaxial to the bore and having a first end disposed toward the fluid reservoir and defining a substantially flat face which is positioned perpendicular to the bore, and a second end disposed toward said chamber and having a head which is external to the plug member and which has a substantially flat face positioned perpendicular to the bore, the flat 29,626-F -2-face of the head having a surface area greater than the cross-sectional area of the shaft but less than the cross-sectional area of the bore.
Figure l is a cross-sectional view of a pressure transducer body of the invention.
From the drawing, it is apparent that the external shape of transducer body 11 can take on whatever configuration is convenient to the user. The transducer of the invention is generally designated by reference number 10 and includes the body 11 which has a first end and a second end and a bore extending along the entire length of the transducer body from a first to a second end. The bore may be of a substantially uniform diameter, or it may be of a varying diameter. The transducer body is provided with a bore portion 12 for receiving a conventional pressure transducer 17. The bore portion 12 is located at the first end of the transducer body and is in fluid communication with a fluid reservoir 13.
A stationary elastic plug member 14 has a first end in communication with a fluid in the reservoir 13 and a second end adjacent to a chamber 16 in the transducer body for receiving a fluid under pressure.
The chamber 16 is defined within the bore of the transducer body.
The stationary elas-tic plug member 14 can be made from a variety of materials, but it is prefer~bly made of an elastomeric material that is resistant to chemicals, heat and abrasion. ~or example, the plug member can be made from a variety of rubbers, such as 29,626-F -3-o styrene-butadiene rubber, ethylene-propylene terpolymers (EPDM), urethanes, nitrile interpolymers, fluorinated aliphatic hydrocarbon polymers (e.g., those sold by DuPont under the trade ~e VIATON), and the like. Of S these, the fluorinated aliphatic polymers are most preferred. The elastic plug member can be made externally of the transducer body but is preferably prepared by curing the elastomeric material in situ.
By way of illustration, a predetermined amount of an uncured ru~ber is charged into the bore, a rigid pin 15 is inserted and held in place while the rubber is cured using appropriate amounts of head and pressure to produce a substantially void free elastomeric cured plug.
The pin member 15 is defined by an elongate shaft 15c extending substantially through the elastomeric plug member and is positioned coaxial to the bore. The shaft of the pin has an end positioned towards the fluid reservoir 13 and a head 15a which has a substantially flat face 15b which is positioned perpendicular to the bore. Normally, the end of the shaft is merely a cross-section of the shaft 15c. The head of the shaft is disposed towards the chamber for receiving fluid under pressure and is external to the elastomeric rubber plug. The flat face 15b of the head has a surface area that is greater than the cross-sectional area of the shaft itself but less than the cross-sectional area of the bore. Preferably, the pin is of a unitary construction and has a circular cross-sectional con-figuration. By way of example, when preparing a trans-ducer body having a one inch ~2.45 cm) diameter bore, the pin is conveniently prepared by cutting a 3/8 inch (0.95 cm~ rod to a length of approximately 1 3/8 inches 29,626-F -4-11~7Z8~
~3.5 cm) and machining it down so as to leave a head having 1/4 inch (0.64 cm) thickness and a shaft having 1 1/8 inch (2.86 cm) length and 1/4 inch (0.64 cm) diameter; this pin, for example is used in a VIATON~
plug cured in situ with a plug length of l 3/8 - 1 1/2 inches (3.5-3.8 cm).
The type of fluid used in the fluid reservoir is not critical so long as it is an essentially non-compressible hydraulic fluid. The fluid 18 should completely fill the reservoir 13 without leaving air bubbles or other void spaces. The fluid can be either liquid or semi-solid and applicants have found it useful to use a high viscosity silicon or hydrocarbon grease to fill the fluid reservoir. The fluid in the 1~ reservoir is in fluid communication with a first end of the elastomeric plug member 14 and the transducer 17.
This fluid communication is established by merely having a direct interface between the fluid 18 in the reservoir 13 and the plug member 14 and a pressure sensing surface of the transducer 17. Generally, a fluid retaining means is used to prevent fluid in the reservoir from bypassing the body of the transducer.
Such fluid retaining means may simply be a shoulder exending into the bore of the transducer body. Other fluid retaining means (e.g., O-rings, rubber gaskets, etc.) can be used; such means would be readily apparent to the skilled artisan. Pressure transducers with a circular cross-section and flat recording face are preferred.
The transducer body is normally mounted on a pressure pump or pipeline carrying a liquid under pressure.
The pressurized liquid flows into the chamber 16 and 29,626-F -5-~177Z80 impinges against the pin 15. This causes a deflection of the pin toward the fluid 18 in the fluid reservoir, which in turn transmits the pressure to the pressure transducer 17. Pressure transducer bodies constructed S in accordance with the present invention have been found to be exceedingly reliable and durable and have performed with a high degree of accuracy. Attempts to prepare "similar" transducer bodies using just a solid elastomeric plug (without the pin) or using an elastomeric plug having a pin without a head were substantially less accurate and gave less reproducible results.
29,626-F -6-.
This invention pertains to a new pressure transducer body and, in particular, to a pressure transducer body adapted for use in measuring pressures of corrosive and/or abrasive fluids subject to pulsating pessure loadings.
There are a variety of transducer bodies known in the art. For transducer bodies that might be subject to heavy pulsating types of loading, the most commonly used device contains a diaphragm with a hydraulic liquid separating the diaphragm and a recording pressure transducer. This type of transducer body has problems with rupture of the diaphragm due to pulsations or loss of hydraulic fluid which allows the diaphragm to deform excessively.
Another type of transducer body has been a piston type in which a hydraulic liquid is located between the pressure transducer and the piston. Again, under operating conditions the heavy pulsating types of loading usually causes fluid leak off and permits the piston to "bottom out" against -the transducer. This results in inaccurate and unreliable readings.
29,626-F -l-1~772~0 ~ ore specifically, the present invention resides in a pressure transducer body having a first end and a second end defining a bore which extends from the first to the second end, and having (a) means for receiving a pressure transducer, (b) a fluid reservoir, (c) a stationary elastic plug member having embedded therein a T-shaped rigid pin member, and (d) a chamber for receiving a fluid under pressure;
said means for receiving the pressure transducer being located adjacent the first end of said transducer body and in fluid communication with the ~luid reservoir, said fluid reservoir being defined within the bore of the transducer body and being located between said means for receiving the pressure transducer and the plug member, said plug member having a first end in fluid communication with the fluid reservoir and a second end adjacent to the chamber for receiving a fluid under pressure, said chamber being defined withir. said bore, said plug member having a rigid pin member embedded therein; said pin member being defined by an elongate shaft extending substantially through the plug member and positioned coaxial to the bore and having a first end disposed toward the fluid reservoir and defining a substantially flat face which is positioned perpendicular to the bore, and a second end disposed toward said chamber and having a head which is external to the plug member and which has a substantially flat face positioned perpendicular to the bore, the flat 29,626-F -2-face of the head having a surface area greater than the cross-sectional area of the shaft but less than the cross-sectional area of the bore.
Figure l is a cross-sectional view of a pressure transducer body of the invention.
From the drawing, it is apparent that the external shape of transducer body 11 can take on whatever configuration is convenient to the user. The transducer of the invention is generally designated by reference number 10 and includes the body 11 which has a first end and a second end and a bore extending along the entire length of the transducer body from a first to a second end. The bore may be of a substantially uniform diameter, or it may be of a varying diameter. The transducer body is provided with a bore portion 12 for receiving a conventional pressure transducer 17. The bore portion 12 is located at the first end of the transducer body and is in fluid communication with a fluid reservoir 13.
A stationary elastic plug member 14 has a first end in communication with a fluid in the reservoir 13 and a second end adjacent to a chamber 16 in the transducer body for receiving a fluid under pressure.
The chamber 16 is defined within the bore of the transducer body.
The stationary elas-tic plug member 14 can be made from a variety of materials, but it is prefer~bly made of an elastomeric material that is resistant to chemicals, heat and abrasion. ~or example, the plug member can be made from a variety of rubbers, such as 29,626-F -3-o styrene-butadiene rubber, ethylene-propylene terpolymers (EPDM), urethanes, nitrile interpolymers, fluorinated aliphatic hydrocarbon polymers (e.g., those sold by DuPont under the trade ~e VIATON), and the like. Of S these, the fluorinated aliphatic polymers are most preferred. The elastic plug member can be made externally of the transducer body but is preferably prepared by curing the elastomeric material in situ.
By way of illustration, a predetermined amount of an uncured ru~ber is charged into the bore, a rigid pin 15 is inserted and held in place while the rubber is cured using appropriate amounts of head and pressure to produce a substantially void free elastomeric cured plug.
The pin member 15 is defined by an elongate shaft 15c extending substantially through the elastomeric plug member and is positioned coaxial to the bore. The shaft of the pin has an end positioned towards the fluid reservoir 13 and a head 15a which has a substantially flat face 15b which is positioned perpendicular to the bore. Normally, the end of the shaft is merely a cross-section of the shaft 15c. The head of the shaft is disposed towards the chamber for receiving fluid under pressure and is external to the elastomeric rubber plug. The flat face 15b of the head has a surface area that is greater than the cross-sectional area of the shaft itself but less than the cross-sectional area of the bore. Preferably, the pin is of a unitary construction and has a circular cross-sectional con-figuration. By way of example, when preparing a trans-ducer body having a one inch ~2.45 cm) diameter bore, the pin is conveniently prepared by cutting a 3/8 inch (0.95 cm~ rod to a length of approximately 1 3/8 inches 29,626-F -4-11~7Z8~
~3.5 cm) and machining it down so as to leave a head having 1/4 inch (0.64 cm) thickness and a shaft having 1 1/8 inch (2.86 cm) length and 1/4 inch (0.64 cm) diameter; this pin, for example is used in a VIATON~
plug cured in situ with a plug length of l 3/8 - 1 1/2 inches (3.5-3.8 cm).
The type of fluid used in the fluid reservoir is not critical so long as it is an essentially non-compressible hydraulic fluid. The fluid 18 should completely fill the reservoir 13 without leaving air bubbles or other void spaces. The fluid can be either liquid or semi-solid and applicants have found it useful to use a high viscosity silicon or hydrocarbon grease to fill the fluid reservoir. The fluid in the 1~ reservoir is in fluid communication with a first end of the elastomeric plug member 14 and the transducer 17.
This fluid communication is established by merely having a direct interface between the fluid 18 in the reservoir 13 and the plug member 14 and a pressure sensing surface of the transducer 17. Generally, a fluid retaining means is used to prevent fluid in the reservoir from bypassing the body of the transducer.
Such fluid retaining means may simply be a shoulder exending into the bore of the transducer body. Other fluid retaining means (e.g., O-rings, rubber gaskets, etc.) can be used; such means would be readily apparent to the skilled artisan. Pressure transducers with a circular cross-section and flat recording face are preferred.
The transducer body is normally mounted on a pressure pump or pipeline carrying a liquid under pressure.
The pressurized liquid flows into the chamber 16 and 29,626-F -5-~177Z80 impinges against the pin 15. This causes a deflection of the pin toward the fluid 18 in the fluid reservoir, which in turn transmits the pressure to the pressure transducer 17. Pressure transducer bodies constructed S in accordance with the present invention have been found to be exceedingly reliable and durable and have performed with a high degree of accuracy. Attempts to prepare "similar" transducer bodies using just a solid elastomeric plug (without the pin) or using an elastomeric plug having a pin without a head were substantially less accurate and gave less reproducible results.
29,626-F -6-.
Claims (4)
1. A pressure transducer body having a first end and a second end defining a bore which extends from the first to the second end, and having (a) means for receiving a pressure transducer, (b) a fluid reservoir, (c) a stationary elastic plug member having embedded therein a T-shaped rigid pin member, and (d) a chamber for receiving a fluid under pressure;
said means for receiving the pressure transducer being located adjacent the first end of said transducer body and in fluid communication with the fluid reservoir, said fluid reservoir being defined within the bore of the transducer body and being located between said means for receiving the pressure transducer and the plug member, said plug member having a first end in fluid communication with the fluid reservoir and a second end adjacent to the chamber for receiving a fluid under pressure, said chamber being defined within said bore, said plug member having a rigid pin member embedded therein; said pin member being defined by an elongate shaft extending substantially through the plug member and positioned coaxial to the bore and having a first end disposed toward the fluid reservoir and 29,626-F -7-defining a substantially flat face which is positioned perpendicular to the bore, and a second end disposed toward said chamber and having a head which is external to the plug member and which has a substantially flat face positioned perpendicular to the bore, the flat face of the head having a surface area greater than the cross-sectional area of the shaft but less than the cross-sectional area of the bore.
said means for receiving the pressure transducer being located adjacent the first end of said transducer body and in fluid communication with the fluid reservoir, said fluid reservoir being defined within the bore of the transducer body and being located between said means for receiving the pressure transducer and the plug member, said plug member having a first end in fluid communication with the fluid reservoir and a second end adjacent to the chamber for receiving a fluid under pressure, said chamber being defined within said bore, said plug member having a rigid pin member embedded therein; said pin member being defined by an elongate shaft extending substantially through the plug member and positioned coaxial to the bore and having a first end disposed toward the fluid reservoir and 29,626-F -7-defining a substantially flat face which is positioned perpendicular to the bore, and a second end disposed toward said chamber and having a head which is external to the plug member and which has a substantially flat face positioned perpendicular to the bore, the flat face of the head having a surface area greater than the cross-sectional area of the shaft but less than the cross-sectional area of the bore.
2. The pressure transducer body of Claim 1 wherein the shaft and head of said pin member each have a circular cross-section.
3. The pressure transducer body of Claim 1 including a non-compressible hydraulic fluid which fills the fluid reservoir.
4. The pressure transducer body of Claim 3 including a pressure transducer in operational com-munication with the hydraulic fluid.
29,626-F -8-
29,626-F -8-
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000407508A CA1177280A (en) | 1982-07-19 | 1982-07-19 | Pressure transducer body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000407508A CA1177280A (en) | 1982-07-19 | 1982-07-19 | Pressure transducer body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1177280A true CA1177280A (en) | 1984-11-06 |
Family
ID=4123237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000407508A Expired CA1177280A (en) | 1982-07-19 | 1982-07-19 | Pressure transducer body |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1177280A (en) |
-
1982
- 1982-07-19 CA CA000407508A patent/CA1177280A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |