Pipe Branching Manifold and Method of Operating the same TECHNICAL FIELD

The invention relates to a pipe branching manifold and to a method of operating the same, the pipe branching manifold having a multitude of pipe branches, each of the pipe branches having an entry block valve, an exit block valve, and a bleed outlet with a bleed valve between the entry block valve and the exit block valve, wherein in a standard operation of each pipe branch, the respective entry block valve and exit block valve are open, and the respective bleed valve is closed, and wherein in a test operation or maintenance operation of each pipe branch, the respective entry block valve and exit block valve are closed, and the respective bleed valve is open, and the manifold having a selector means for selecting either none or one out of the pipe branches for switching from standard operation to test operation or maintenance operation, wherein the selector means allows only the one entry block valve of the selected pipe branch to be closed, which

subsequently allows the respective bleed valve and exit block valve to be opened and closed to switch to the test operation or to the maintenance operation respectively.

Alternatively wherein in a test operation of each pipe branch the entry block valve is closed and both the bleed valve as well as the exit block valve are open, enabling the bleed valve to be used as entry point for a test fluid at a test pressure and wherein in a maintenance operation of each pipe branch the respective entry block valve and exit block valve are closed and the respective bleed valve is open, where by alternatively a dedicated test connection can be added downstream of the exit block valve. BACKGROUND ART

Devices featuring the above are commonly known as "one out of N double block- and-bleed manifold", wherein "N" is a digit above 1 , and the phrases "one out of N" and "double block-and-bleed" are often abbreviated as "1 ooN" and "dbb". 1oo3 dbb manifolds are in particular used in "High Integrity Pressure Protection

Systems" (HIPPS) for a fluid line, in particular in oil or gas piping systems. In such HIPPS, the three lines of the 1oo3 dbb manifold - it can also be two lines of 1 oo2, or more (four lines or more) - each contact independent pressure transmitters or switches to the pressure to be monitored downstream of an ON/OFF-Valve.

Whenever any of the pressure transmitters signals the pressure to exceed a critical value, the HIPPS closes the one or more valve(s). The pressure is measured by the pressure transmitters, the pressure transmitter signal is voted 2oo3 by the logic solver, when 2 of the 3 transmitters give high signal, the logic solver will close one or more valves to prevent further pressure increase.

Having three independent pressure transmitters ensures redundant measurement, and operation without interruption in particular during periodical inspection, testing, calibration, maintenance, repair or replacement (hereinafter summarized as "test and maintenance") of the pressure transmitters: For inspection of any of the pressure transmitters, the related pipe branch is separated from the fluid pipe by closing its entry block valve, remaining pressure released from the pressure transmitter by opening its bleed valve to the ambience, and the pressure

transmitter isolated from the ambience by closing its exit block valve. After inspecting and/or maintaining the pressure transmitter, any remaining pressure is released from the pressure transmitter by opening the exit block valve, then the pressure transmitter closed from the ambience by closing the bleed valve, and last the pressure transmitter re-connected to the fluid line by opening the entry block valve.

ASTAVA B. V., Meppel/NL provides an interlocking system for a 1oo3 and 1 oo2 dbb manifold, based on a crank handle that is mechanically caught in a complex track, that only allows, by positioning and turning the handle, first to select a pipe branch, then to close the entry block valve, then to open the bleed valve, and last to close the exit block valve of the selected branch. Smith Flow Control Ltd., Lynbrook/AU and Netherlocks Safety Systems, Alphen aan den Rijn/NL each provide elaborate loose key systems, wherein any key, if delivered from a control room, and applied to a compatible valve, allows the operator only to open or close this same valve. Both the known track-caught handle, and the known key systems, allow for building pipe branching manifolds according to the above.

In technical background of the invention, US 4,429, 711 A discloses a multivalve interlock and control system for connecting a pair of pipelines to a differential pressure measuring instrument. The known system has three valves, each driven by a swiveling handle, each of the handles having a circular control means, that has up to three notches for mechanically interacting with the other control means, so as to allow the valves to be opened or closed in a mechanically defined sequence, only.

Disadvantages of prior art: cumbersome to operate, not easy to adapt for remote operation like subsea operation.

PROBLEM TO BE SOLVED

It is an object of the invention to provide a 1ooN dbb pipe branching manifold that is kept both mechanically simple, and easy to operate and can be adapted for remote operation by a so called ROV in a subsea application.

SUMMARY OF INVENTION

The invention suggests that the selector means has a standard blocking element, and a test permitting element, and that each of the entry block valves has an entry control means with a standard blocking counter element positively fitting to the standard blocking element, and with a test permitting counter element positively fitting to the test permitting element, wherein in standard operation of the

respective pipe branch, mechanical interaction of the standard blocking element and the standard blocking counter element prevents the entry block valve from closing, and wherein after selecting the respective pipe branch for test operation, mechanical interaction of the test permitting element and the test permitting counter element allows for closing the entry block valve and subsequent opening and closing of the respective bleed valve and exit valve, to enable either the test operation or the maintenance operations.

The selector means in the pipe branching manifold according to the invention, in interacting with each of the entry control means has a double function: In standard operation this interaction blocks the respective entry block valve (which

necessarily implies the selector means to be an integral part of the pipe branching manifold), and in test operation or maintenance operation releases the selected entry block valve and subsequently the other valves in the branch. Both the double function of the selector means, and its integration as a component into the pipe branching manifold, keeps the same mechanically simple, can be locked, and easy to operate.

Preferrably, in a pipe branching manifold according to the invention, the standard blocking counter element and the test permitting element are notches, shaped into the selector means, and into the entry control means, respectively. Notches can easily be shaped into the selector means, and into the entry control means, e.g. by mold forming, or by milling.

Advantageously, in a pipe branching manifold according to the invention, the entry control means are pivotable disks. Commonly known valves have swiveling handles, or wheels, for manual operation. A pivotable disk can easily by design be added to the axis of such handles, or wheels.

Favourably, in such pipe branching manifold, the test permitting counter element has a radius of the disk. The test permitting counter element being a segment of a circular disk, is particularly easy to manufacture into an entry control means that basically is a circular disk.

Ideally, in a pipe branching manifold according to the invention, the selector means is a pivotable disk. In such pipe branching manifold, selecting any pipe branch for test operation is easily performed by turning the selector means about an axis of the pivotable disk. In another pipe branching manifold according to the invention, the selector means might be a slidable bar, and the entry control means being arranged side by side, along the bar.

In a preferred embodiment of the pipe branching manifold according to the invention, each of the bleed valves has a bleed control means with a second standard blocking counter element positively fitting to a second standard blocking element in the entry control means, and with a second test permitting counter element positively fitting to a second test permitting element in the entry control means, wherein in open state of the entry block valve, mechanical interaction of the second standard blocking element and the second standard blocking counter element prevents the bleed valve from opening, and wherein in closed state of the entry block valve, mechanical interaction of the second test permitting element and the second test permitting counter element allows for opening the bleed valve.

In such pipe branching manifold, each of the entry control means, in addition to interaction with the selector means, has further a double function in interacting with the respective bleed control means: In standard operation this interaction blocks the respective bleed valve, and in test operation releases the same. The further functions of the entry control means keeps this pipe branching manifold even more mechanically simple, and easy to operate.

Preferrably, in such pipe branching manifold according to the invention the second standard blocking counter element and the second test permitting element are notches, shaped into the entry control means, and into the bleed control means, respectively. Notches can easily be shaped into the entry control means, and into the bleed control means, e.g. by mold forming, or by milling.

Advantageously, in such pipe branching manifold according to the invention, the bleed control means is a second pivotable disk. Commonly known bleed valves have a swiveling handle, or a wheel, for manual operation. A pivotable disk can easily by design be added to the axis of such handle, or wheel. Favourably, in such pipe branching manifold, the second standard blocking element has the radius of the disk, and the second test permitting counter element has a radius of the second disk. The second standard blocking element being a segment of a circular disk, is particularly easy to manufacture into a bleed control means that basically is a circular disk.

In a preferred embodiment of the pipe branching manifold according to the invention, each of the exit block valves has an exit control means with a third standard blocking counter element positively fitting to a third standard blocking element in the bleed control means, and with a third test permitting counter element positively fitting to a third test permitting element in the bleed control means, wherein in open state of the entry block valve, mechanical interaction of the third standard blocking element and the third standard blocking counter element prevents the exit block valve from closing, and wherein in open state of the bleed valve, mechanical interaction of the third test permitting element and the third test permitting counter element allows for closing the exit block valve.

In such pipe branching manifold, each of the bleed control means, in addition to interaction with the entry control means, has further a double function in interacting with the respective exit control means: In standard operation this interaction blocks the respective exit block valve, and in test operation releases the same. The further functions of the bleed control means keeps this pipe branching manifold even more mechanically simple, and easy to operate.

Preferrably, in such pipe branching manifold according to the invention the third standard blocking counter element and the third test permitting element are notches, shaped into the bleed control means, and into the exit control means, respectively. Notches can easily be shaped into the bleed control means, and into the exit control means, e.g. by mold forming, or by milling.

Advantageously, in such pipe branching manifold according to the invention, the exit control means is a third pivotable disk. Commonly known exit block valves have a swiveling handle, or a wheel, for manual operation. A pivotable disk can easily by design be added to the axis of such handle, or wheel. Favourably, in such pipe branching manifold, the third standard blocking element has the radius of the second disk, and the third test permitting counter element has a radius of the third disk. The third standard blocking element being a segment of a circular disk, is particularly easy to manufacture into an exit control means that basically is a circular disk.

The invention further suggests a High Integrity Pressure Protecting System

(HIPPS) for a fluid line, wherein the HIPPS has an On/Off valve, a logic solver, an initiator for monitoring a downstream pressure of the line, and an actuator, wherein the On/Off valve closes automatically, if the downstream pressure exceeds a critical value, and wherein the initiator has a pipe branching manifold according to the invention, with multiple pipe branches, each of the pipe branches connecting to a respective pressure transmitter. The pipe branching manifold of the HIPPS according to the invention is a "one out of N double block-and-bleed" ("1ooN dbb") manifold as previously characterized in the "background art" section. The HIPPS according to the invention features the advantages previously mentioned for the pipe branching manifold according to the invention. The manifold can be equipped with proximity switches to show the position of the selector, the entry block valve, bleed valve and exit block valve.

The initiator for monitoring downstream pressure of the line can be a pressure transmitter or pressure switch. The On/Off valve can be automatically closed by the initiator (pressure switch), or by the logic solver. The HIPPS can have a test connection downstream of the exit valve, between the exit block valve and the initiator (pressure transmitter, sensor). Alternatively, testing can be done via bleed valve. Position switch on selector means and/or any of the control means can enable remote detection.

The invention even further suggests a method of operating a pipe branching manifold according to the invention, comprising the step of selecting any of the pipe branches for switching from the standard operation to a test operation. The method according to the invention also features the advantages previously mentioned for the pipe branching manifold according to the invention. BEST MODE FOR CARRYING OUT THE INVENTION

The apparatus according to the invention and the associated method are subsequently described in more detail with reference to preferred embodiments illustrated in the following schematic figures.

Fig. 1 shows the valves in a state of the art 1oo3 dbb manifold, in standard operation,

Fig. 2a shows a 1oo3 dbb manifold according to the invention, in standard

operation,

Fig. 2b shows the entry control means of the manifold,

Fig. 2c shows an bleed control means and an exit control means of the

manifold,

Fig. 3a shows the manifold, with one branch selected for test operation, Fig. 3b shows the manifold, with the entry block valve of the selected branch closed,

Fig. 3c shows the manifold, with the bleed valve of the selected branch open, Fig. 3d shows the manifold, with the exit block valve of the selected branch closed, and

Fig. 4 shows a second manifold, according to the invention,

Fig. 5a shows a branch detail of a third manifold, according to the invention, with the entry block valve closed,

Fig. 5b-d show the detail, with the bleed valve one third, two thirds and fully open, Fig. 6a shows a branch detail of a fourth manifold, according to the invention, in standard operation, and

Fig. 6b shows the detail, with the entry block valve closed, and

Fig. 6c-g show the detail, with the bleed valve in four steps partly open, and fully open,

Fig. 7a shows a branch detail of a fifth manifold, according to the invention, in standard operation,

Fig. 7b shows the detail, with the entry block valve closed, and

Fig. 7c shows the detail, with the bleed valve open. Fig. 1 schematically shows a state-of-the-art "one out of three double block-and- bleed" ("1oo3 dbb") manifold 1 for use in a High Integrity Pressure Protecting System (HIPPS), and connecting three separate pressure transmitters to a gas or oil fluid line 2. The known manifold 1 has one process connection splitting into three separate pipe branches 3, each connected to the fluid line 2, having an entry block valve 4, a bleed valve 5 and an exit block valve 6, and connecting to one of the pressure transmitters. The entry block valves 4, the bleed valves 5, and the exit block valve 6 are ball valves, and are opened or closed by rotating each about an axis at right angle to the figured plane, a quarter-turn clockwise, or counterclockwise. The pressure transmitters, as well as further parts of the HIPPS are not shown in fig. 1.

In each branch 3, in standard operation of the manifold 1 , the fluid first passes through the entry block valve 4, then through the bleed valve 5, then through the exit block valve 6, and finally into the pressure transmitters.

Fig. 2a shows a first manifold 7 according to the invention, based on the above mentioned, known manifold 1. In the manifold 7, each entry block valve 4 has an entry control means 8, 9, each bleed valve 5 has a bleed control means 10 and each exit block valve 6 has an exit control means 1 1. The manifold 7 further has a selector means 12 for selecting any of the branches 3, for test operation. In the manifold 7, the selector means 12, the entry control means 8, 9, the bleed control means 10, and the exit control means 1 1 are all basically circular, pivotable disks that are (apart from the selector means 12) mounted to the operating axes of the entry block valves 4, bleed valves 5 and exit block valve 6. The operating axes are not shown. The selector means 12 has a diameter 13 of 100 mm and has one single notch 14 fitting the diameter 15 of the entry control means 8, 9. In other preferred embodiments the diameter 13 changes based upon the valve

dimensions.

The entry control means 8, 9 shown in fig. 2b have a diameter 15 of 90 mm, and one notch 16 fitting the diameter 13 of the selector means 12, and another notch 17 fitting the diameter 18 of the bleed control means 10. In other preferred embodiments the diameter 15 changes based upon the valve dimensions. The manifold 7 has two different types of entry control means 8, 9: The entry control means 8 of the first type are mounted to the entry block valves 4 of the left and right branches 3. The first notch 16 and the second notch 17 are on opposite sides of the entry control means 8.

A second type entry control means 9 is mounted to the entry block valve 4 of the middle branch 3, and has the first notch 16 and the second notch 17 at right angle.

The bleed control means 10 and the exit control means 11 of the manifold 7 are identical for all three braches. Both have a diameter 18 of 80 mm. In other preferred embodiments the diameter 18 changes based upon the valve

dimensions. The bleed control means 10 has a first notch 19 fitting the

diameter 15 of the entry control means 8, 9, and at right angle, a second notch 20 fitting the diameter 18 of the exit control means 11. The exit control means 11 has one single notch 21 fitting the diameter 18 of the bleed control means 10.

In the first manifold 7, the entry control means 8, 9, the bleed control means 10, the exit control means 11 , and the selector means 12 are coplanar, the notches 14, 16, 17, 19, 20, 21 of the first manifold 7 are lens-shaped.

In standard operation mode of the manifold 7, the circular edge 22 as standard blocking element 23 of the selector means 12 fits the first notches 16 as standard blocking counter elements 24 of the entry control means 8, 9, preventing rotation of the same, and closing the entry block valves 4. The circular edges 25 as second standard blocking elements 26 of the entry control means 8, 9 fit the first notches 19 as second standard blocking counter elements 27 of the bleed control means 10, preventing rotation of the same, and opening the bleed valves 5 to the ambience. The circular edges 28 as third standard blocking elements 29 of the bleed control means 10 fit the notches 21 as third standard blocking counter elements 30 of the exit control means 11 , preventing rotation of the same, and closing the exit block valve 6. Figures 3a to 3d show the sequence of action for setting the manifold 7 to test operation for the right branch 3:

First, according to fig. 3a, the selector means 12 is rotated a quarter-turn counterclockwise. The notch 14 as test permitting element 31 of the selector means 12 now fits the circular edge 25 as test permitting counter element 32 of the right entry control means 8, allowing rotation of the same.

Second, according to fig. 3b, the right entry control means 8 is rotated a quarter- turn counter-clockwise, and the right entry block valve 4 closed. The second notch 17 as second test permitting element 33 of the right entry control means 8 now fits the circular edge 28 as second test permitting counter element 34 of the right bleed control means 10, allowing rotation of the same. The circular edge 25 of the right entry control means 8 now fits the notch 14 of the selector means 12, preventing rotation of the same.

Third, according to fig. 3c, the right bleed control means 10 is rotated a quarter- turn clockwise, and the right bleed valve 5, and thus the pressure transmitter opened to the ambience. The second notch 20 as third test permitting element 35 of the right bleed control means 10 now fits the circular edge 36 as third test permitting counter element 37 of the right exit control means 11 , allowing rotation of the same. The circular edge 28 of the right bleed control means 10 now fits the second notch 17 of the right entry control means 8, preventing rotation of the same.

Fourth, according to fig. 3d, the right exit control means 11 is rotated a quarter-turn clockwise, and the right exit block valve 6 closed. The circular edge 36 of the right exit control means 11 now fits the second notch 20 of the right bleed control means 10, preventing rotation of the same.

After setting to the test operation mode shown in fig. 3d, a pressure transmitter at the right branch 3 is both relieved from the pressure of the fluid line 2, and separated from the right branch 3. The pressure transmitter can now be tested, or replaced, without affecting the function of the HIPPS. Deviating from the above, for setting the manifold 7 to test operation for the left branch 3, the selector means 12 would have been rotated a quarter-turn

clockwise. For setting to test operation for the middle branch 3, the selector means 12 would have been rotated a half-turn, and the middle entry control means 9 a quarter-turn clockwise, instead. For each of the branches 3, operation of the bleed control means 10 and the exit control means 11 are as above.

After successful testing, or replacing the pressure transmitter at the right branch 3, the sequence of action shown in fig. 3a to 3d must be reversed, back to standard operation mode:

First, reversing fig. 3d, the right exit control means 11 is rotated a quarter-turn counter-clockwise, and the right exit block valve 6 opened, and thus the pressure transmitter opened to the ambience. The notch 21 of the right exit control means 11 now fits the circular edge 28 of the right bleed control means 10, allowing rotation of the same.

Second, reversing fig. 3c, the right bleed control means 10 is rotated a quarter-turn counter-clockwise, and the right bleed valve 5, and thus the pressure transmitter closed from the ambience. The first notch 19 of the right bleed control means 10 now fits the circular edge 25 of the right entry control means 8, allowing rotation of the same. The circular edge 28 of the right bleed control means 10 now fits the notch 21 of the right exit control means 11 , preventing rotation of the same.

Third, reversing fig. 3b, the right entry control means 8 is rotated a quarter-turn clockwise, and the right entry block valve 4, and thus the pressure transmitter opened to the fluid line 2. The first notch 16 of the right entry control means 8 now fits the circular edge 22 of the selector means 12, allowing rotation of the same. The circular edge 25 of the right entry control means 8 now fits the first notch 19 of the right bleed control means 10, preventing rotation of the same.

Fourth, reversing fig. 3a, the selector means 12 is rotated a quarter-turn clockwise. The circular edge 22 of the selector means 12 now fits the first notch 16 of the right entry control means 8, preventing rotation of the same. Alternatively, the selector means 12 may be turned a half-turn, for setting the manifold 7 to test operation for the left branch 3, or a quarter-turn counter-clockwise, for setting the manifold 7 to test operation for the middle branch 3.

Fig. 4 shows a second manifold 38 according to the invention, that differs from the first manifold 7 presented above, in that the selector means 39 is a bar, and the first notches 40 of the entry control means 41 are straightly cut segments.

The second manifold 38 is shown in standard operation mode, but prepared for test operation of the right pipe branch 42: The upper straight edge 43 as standard blocking element 44 of the selector means 39 fits the first notches 40 as standard blocking counter elements 45 of the left and middle entry control means 41 , preventing rotation of the same, and closing the left and middle entry block valves, and the respective pressure transmitters, from the fluid line 46. A notch 47 as test permitting element 48 of the selector means 39 fits the circular edge 49 as test permitting counter element 50 of the right entry control means 41 , allowing rotation of the same, and closing the right entry block valve, and the respective pressure transmitter, from the fluid line 46. The pressure transmitters are not shown.

Fig. 5a shows a side view and a top view of an entry control means 51 , a bleed control means 52, and an exit control means 53 in a branch of a third (further not shown) manifold according to the invention. The third manifold differs from the first manifold 7 in that the bleed valves are needle valves, that require three quarter- turns (instead of one) clockwise, for fully opening to the ambience.

In the third manifold, the entry control means 51 and the exit control means 53 are basically identical in shape to those of the first manifold 7. Only has the entry control means 51 double the thickness 54 of the exit control means 53, and is the second notch 55 (and accordingly the first notch 56 of the bleed control means 52) smaller than in the first manifold 7.

The bleed control means 52 also has double the thickness 54 of the exit control means 53. And further deviating from the first manifold 7, the second notch 57 of the bleed control means 52, that fits to the circular edge 58 of the exit control means 53, has only (slightly more than) the thickness 54 of the exit control means 53.

According to fig. 5a, the related branch is selected for test operation, the entry control means 51 rotated a quarter-turn clockwise, and the entry block valve closed. The second notch 55 as second test permitting element 59 of the entry control means 51 fits the circular edge 60 as second test permitting counter element 61 of the bleed control means 52, allowing rotation of the same. The circular edge 60 as third standard blocking element 62 of the bleed control means 52 fits the notch 63 as third standard blocking counter element 64 of the exit control means 53, preventing rotation of the same.

After turning the bleed control means 52 one quarter-turn clockwise, according to fig. 5b, the bleed valve is one third open. The second notch 55 of the entry control means 51 still fits the circular edge 60 of the bleed control means 52, that the second notch having slightly more thickness than 54. Fill the notch of 55 of entry control means 51 the second notch 57 of the bleed control means 52. The circular edge 60 of the bleed control means 52 still fits the notch 63 of the exit control means 53.

After turning the bleed control means 52 another quarter-turn clockwise, according to fig. 5c, the bleed valve is two thirds open. The second notch 55 of the entry control means 51 still fits the circular edge 60 of the bleed control means 52. The circular edge 60 of the bleed control means 52 still fits the notch 63 of the exit control means 53, because the first notch 56 of the bleed control means 52 is smaller than the notch 63 of the exit control means 53.

After turning the bleed control means 52 a last quarter-turn clockwise, according to fig. 5d, the bleed valve is fully open. The second notch 55 of the entry control means 51 still fits the circular edge 60 of the bleed control means 52. The second notch 57 as third test permitting element 65 of the bleed control means 52 fits the circular edge 58 as third test permitting counter element 66 of the exit control means 53, allowing rotation of the same, and closing the exit block valve. Fig. 6a shows a side view and a top view of an entry control means 67, a bleed control means 68, and an exit control means 69 in a branch of a fourth (further not shown) manifold according to the invention. The fourth manifold differs from the first manifold 7 in that the bleed valves are needle valves, that require multiple (instead of one quarter) turns counter-clockwise, for fully opening to the ambience.

In the fourth manifold, the entry control means 67 and the exit control means 69 are basically identical in shape to the entry control means 67 and the exit control means 69 of the first manifold 7. Only has the entry control means 67 one and a half times the thickness 70 of the exit control means 69.

The bleed control means 68 has double the thickness 70 of the exit control means 69. Further deviating from the first manifold 7, the first notch 71 of the bleed control means 68, that fits to the circular edge 72 of the entry control means 67, has only (slightly more than) the thickness 70 of the same. And the bleed control means 68 has no second control means, that fits to the exit control means 69. Instead, the bleed control means 68, in rotating lifts over the exit control means 69, for allowing rotation of the same.

Starting from standard operation mode, shown in fig. 6a, after the related branch is selected for test operation, according to fig. 6b, the entry control means 67 is rotated a quarter-turn clockwise, and the entry block valve closed. The second notch 73 as second test permitting element 74 of the entry control means 67 fits the circular edge 75 as second test permitting counter element 76 of the bleed control means 68, allowing rotation of the same. The circular edge 75 as third standard blocking element 77 of the bleed control means 68 fits the notch 78 as third standard blocking counter element 79 of the exit control means 69,

preventing rotation of the same.

After turning the bleed control means 68 one quarter-turn clockwise, according to fig. 6c, the bleed valve is one sixth open. The second notch 73 of the entry control means 67 still fits the circular edge 75 of the bleed control means 68. The circular edge 75 of the bleed control means 68 still fits the notch 78 of the exit control means 69. After turning the bleed control means 68 another quarter-turn clockwise, according to fig. 6d, the bleed valve is two sixth open. The second notch 73 of the entry control means 67 still fits the circular edge 75 of the bleed control means 68. The circular edge 75 of the bleed control means 68, that overlaps the first notch 71 of the bleed control means 68 still fits the notch 78 of the exit control means 69.

After turning the bleed control means 68 another quarter-turn clockwise, according to fig. 6e, the bleed valve is half open. The second notch 73 of the entry control means 67 still fits the circular edge 75 of the bleed control means 68. The circular edge 75 of the bleed control means 68 still fits the notch 78 of the exit control means 69.

After turning the bleed control means 68 another quarter-turn clockwise, according to fig. 6f, the bleed valve is two thirds open. The second notch 73 of the entry control means 67 still fits the circular edge 75 of the bleed control means 68, that overlaps the first notch 71 of the bleed control means 68. The circular edge 75 of the bleed control means 68 still fits the notch 78 of the exit control means 69.

After turning the bleed control means 68 a last half-turn clockwise, according to fig. 6g, the bleed valve is fully open. The second notch 73 of the entry control means 67 still fits the circular edge 75 of the bleed control means 68. Meanwhile, the bleed control means 68 has lifted over the exit control means 69. The lower surface 80 as third test permitting element 81 of the bleed control means 68 thus fits the upper surface 82 as third test permitting counter element 83 of the exit control means 69, allowing rotation of the same, and closing the exit block valve.

Fig. 7a shows a side view and a top view of an entry control means 84, a bleed control means 85, and an exit control means 86 in a branch of a fifth (further not shown) manifold according to the invention. The fifth manifold differs from the first manifold 7 in that it has the bleed valves on the side of the branch.

As in the first manifold 7, the entry control means 84 has one notch fitting the selector means (neither notch nor selector means are shown, here), and another notch 87 fitting the bleed control means 85. The bleed control means 85 has a first notch 88 fitting the entry control means 84, and at right angle, a second notch 89 fitting the exit control means 86. The exit control means 86 has one single notch 90 fitting the bleed control means 85. In the branch, the entry control means 84 and the exit control means 86 are coplanar, and perpendicular to the bleed control means 85. The notches 87, 88, 89, 90 of the fifth manifold are slots.

In standard operation mode, shown in fig. 7a, the circular edge 91 as second standard blocking element 92 of the entry control means 84 fits the first notch 88 as second standard blocking counter element 93 of the bleed control means 85, preventing rotation of the same. The circular edge 94 as third standard blocking element 95 of the bleed control means 85 fits the notch 90 as third standard blocking counter element 96 of the exit control means 86, preventing rotation of the same.

Figures 7b and 7c show the sequence of action for setting the branch to test operation:

After selecting the branch for test operation, according to fig. 7b, the entry control means 84 is rotated a quarter-turn counter-clockwise, and the right entry block valve closed. The second notch 87 as second test permitting element 97 of the entry control means 84 now fits the circular edge 94 as second test permitting counter element 98 of the bleed control means 85, allowing rotation of the same. The circular edge 91 of the entry control means 84 now prevents rotation of the selector means.

Then, according to fig. 7c, the bleed control means 85 is rotated a quarter-turn clockwise, and the bleed valve, and thus the pressure transmitter opened to the ambience. The second notch 89 as third test permitting element 99 of the bleed control means 85 now fits the circular edge 100 as third test permitting counter element 101 of the exit control means 86, allowing rotation of the same. The circular edge 94 of the bleed control means 85 now fits the second notch 87 of the entry control means 84, preventing rotation of the same. In yet another HIPPS according to the invention, a test connection may be between exit block valve and pressure transmitter (sensor). Further alternatively, testing may be done via the bleed valve. A position switch on the selector means and/or any of the control means may enable remote detection.

In the figures are

1 manifold

2 fluid line

3 branch

entry block valve

5 bleed valve

exit block valve

manifold

8 entry control means

entry control means

10 bleed control means

11 exit control means

12 selector means

13 diameter

14 notch

15 diameter

16 notch

17 notch

18 diameter

19 notch

0 notch

1 notch

2 edge

3 standard blocking element

4 standard blocking counter element 5 edge

6 standard blocking element

7 standard blocking counter element 8 edge

9 standard blocking element

0 standard blocking counter element test permitting element

test permitting counter element test permitting element

test permitting counter element test permitting element

edge

test permitting counter element manifold

selector means

notch

entry control means

branch

edge

standard blocking element standard blocking counter element fluid line

notch

test permitting element

edge

test permitting counter element entry control means

bleed control means

exit control means

thickness

notch

notch

notch

edge

test permitting element

edge

test permitting counter element standard blocking element notch

standard blocking counter element test permitting element

test permitting counter element entry control means

bleed control means

exit control means

thickness

notch

edge

notch

test permitting element

edge

test permitting counter element standard blocking element notch

standard blocking counter element surface

test permitting element

surface

test permitting counter element entry control means

bleed control means

exit control means

notch

notch

notch

notch

edge

standard blocking element standard blocking counter element edge

standard blocking element standard blocking counter element test permitting element

test permitting counter element test permitting element

edge

test permitting counter element