A serial cooling system for reaction vessels

Abstract

This utility model relates to the field of chemical production technology, specifically to an anti-sequence cooling system for a reactor. The system includes a reactor, an inlet delivery main pipe connected to the top of one side of the jacket, a distributor connected to the inlet port of the inlet delivery main pipe, cooling water inlet delivery branch pipes and chilled water inlet delivery branch pipes respectively connected to the two inlet ports of the distributor, vertical centrifugal pumps and pneumatic shut-off valves correspondingly installed on the cooling water inlet delivery branch pipes and chilled water inlet delivery branch pipes, a pneumatic shut-off valve installed on the outlet main pipe section, and a chilled water treatment unit and a cooling water treatment unit connected to the outlet port of the outlet main pipe via a diversion valve. This system uses independent cooling water and chilled water circulation loops to prevent media cross-contamination, ensuring stable and safe cooling. It meets the diverse cooling needs of the reactor, and through independent loops, precise control, and efficient circulation, it reduces failures and maintenance costs, ensures stable operation, and improves production efficiency and product quality.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to an anti-sequence cooling system for a reaction vessel. Background Technology

[0002] In chemical production processes, the cooling system of a reactor typically consists of two independent subsystems: cooling water (temperature range 15℃~25℃) and chilled water (temperature below 15℃).

[0003] However, in actual operation, the two systems often share the jacket and piping of the reactor. Due to the lack of precise power control and flow regulation mechanisms, the supply of media cannot be flexibly adjusted according to cooling needs, resulting in an unsuitable cooling effect. At the same time, because a strictly independent circulation loop is not constructed and the level of automation control is insufficient, when the same equipment switches to use two media, media cross-contamination can easily occur due to operator inexperience or misoperation. That is, cooling water mixes into the chilled water tank, or chilled water leaks into the cooling water tank, causing both systems to malfunction. In addition, media circulation relies heavily on manual intervention and lacks closed-loop processing and automatic circulation design, which not only results in low operating efficiency but also frequent downtime for maintenance due to system failures, directly affecting production progress and causing economic losses. Utility Model Content

[0004] The purpose of this invention is to provide a non-serialization cooling system for reactors, which solves the problems in existing reactor cooling systems where cooling water and chilled water share the same jacket and pipelines. Due to the lack of precise control and independent loops, it is difficult to adjust the supply as needed, resulting in poor cooling adaptability. Switching is prone to media serialization and system paralysis due to operational problems. Furthermore, it relies on manual operation, lacks closed-loop automatic circulation, and has low efficiency, many failures, affecting production and causing losses.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a serial cooling system for a reactor, comprising a reactor, a jacket disposed on the outer wall of the reactor, a main inlet pipe connected to the top of one side of the jacket, a distributor connected to the inlet port of the main inlet pipe, cooling water inlet branch pipes and chilled water inlet branch pipes respectively connected to the two inlet ports of the distributor, vertical centrifugal pumps and pneumatic shut-off valves correspondingly disposed on the cooling water inlet branch pipes and chilled water inlet branch pipes, and a cooling water inlet branch pipe connected to the top of one side of the jacket. The system includes a bottom-connected main outlet pipe, a pneumatic shut-off valve installed on the main outlet pipe section, a chilled water treatment unit and a cooling water treatment unit connected to the outlet port of the main outlet pipe via a diversion valve; the inlet port of the cooling water inlet delivery branch pipe is connected to the cooling water treatment unit, and the inlet port of the chilled water inlet delivery branch pipe is connected to the chilled water treatment unit; the cooling water treatment unit and the cooling water inlet delivery branch pipe form a cooling water circulation loop, and the chilled water treatment unit and the chilled water inlet delivery branch pipe form a chilled water circulation loop.

[0006] Furthermore, both the cooling water treatment unit and the chilled water treatment unit include an intermediate storage tank, a treatment tank, a return pipe connecting the intermediate storage tank and the treatment tank, a level gauge installed in the intermediate storage tank, a delivery pump installed on the return pipe section and interlocked with the level gauge, and an outlet delivery branch pipe connected to the upper side of the intermediate storage tank. The inlet port of the outlet delivery branch pipe is connected to the outlet port of the main outlet pipe.

[0007] Furthermore, the treatment tank of the cooling water treatment unit is a cooling tower, and the treatment tank of the chilled water treatment unit is a chiller.

[0008] Furthermore, the intermediate storage tank includes a tank body, an outlet connection pipe communicating with the bottom of one side of the tank body, an inlet connection mechanism located on the upper side of the tank body and communicating with the inlet port of the outlet delivery branch pipe, a stainless steel filter screen cylinder tightly fitted to the lower side of the inlet connection mechanism and located inside the tank body, and a sewage discharge mechanism located on the lower side of the tank body and corresponding to the stainless steel filter screen cylinder; the lower end of the stainless steel filter screen cylinder is inserted into the lower interior of the tank body; the level gauge is located inside the tank body and is spaced apart from the stainless steel filter screen cylinder; one end of the outlet connection pipe is connected to the inlet port of the return pipe through a flange.

[0009] Furthermore, a circular through hole is provided on the upper side of the tank body; the liquid inlet connection mechanism includes a cylindrical insert seat that is inserted into the circular through hole, a cover plate that is connected to the upper side of the cylindrical insert seat and tightly fitted to the upper side of the tank body, and a liquid inlet connection pipe that communicates with the upper side of the cover plate; one end of the liquid inlet connection pipe is connected to the liquid inlet port of the liquid outlet conveying branch pipe through a flange, and the other end is connected to the cylindrical insert seat; an O-ring is provided at the gap between the cylindrical insert seat and the circular through hole.

[0010] Furthermore, the lower side of the tank is provided with a conical opening that communicates with a stainless steel filter screen cylinder; the sewage discharge mechanism includes a sewage discharge pipe located on the lower side of the tank and communicating with the conical opening, and a sealing cover connected to the lower end of the sewage discharge pipe via a flange.

[0011] Furthermore, the lower interior of the tank is provided with an annular slot located around the conical opening, and the lower end of the stainless steel filter cylinder is connected to a plug ring that matches the annular slot.

[0012] Furthermore, a rubber sealing ring resistant to media corrosion is provided between the lower side of the cover plate and the tank body, and between the sealing cover and the drain pipe.

[0013] Furthermore, a steam / compressed air outlet main pipe is connected to the section of the liquid outlet main pipe, and the steam / compressed air outlet main pipe is connected to two steam / compressed air outlet branch pipes through a diversion valve. The two liquid inlet ports of the distributor are respectively connected to steam / compressed air pipelines.

[0014] Furthermore, regulating valves are provided on the sections of the cooling water inlet delivery branch pipe, the chilled water inlet delivery branch pipe, the two steam / compressed air pipelines, and the two outlet delivery branch pipes.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] In this novel anti-sequential cooling system, a vertical centrifugal pump provides power for media circulation. Pneumatic shut-off valves, cut-off valves, and diverter valves work together to control the flow and direction of the media. Combined with regulating valves on each branch pipe, precise flow regulation is achieved, ensuring that the cooling effect within the reactor jacket can be flexibly adjusted as needed. The cooling water treatment unit and chilled water treatment unit form a closed-loop cycle through intermediate storage tanks and treatment tanks (cooling towers or chillers). Combined with the interlocking control of level gauges and transfer pumps, automatic processing and recycling of the media are achieved, improving the automation and efficiency of the system. By constructing independent cooling water and chilled water circulation loops, this system fundamentally avoids the sequential mixing of different cooling media, ensuring the stability and safety of the cooling process. It not only meets the diverse cooling temperature requirements of the reactor under different operating conditions but also, through its independent loop design, precise control, and efficient circulation structure, reduces equipment failures and maintenance costs, ensuring continuous and stable operation of the reactor, thereby improving production efficiency and product quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the anti-sequence cooling system for a reaction vessel according to the present invention;

[0018] Figure 2 This is a cross-sectional schematic diagram of the intermediate storage tank of this utility model;

[0019] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 For the present utility model Figure 2 Enlarged diagram of point B in the middle.

[0021] In the diagram: 1. Reactor; 2. Jacket; 3. Main inlet pipe; 4. Distributor; 5. Cooling water inlet branch pipe; 6. Chilled water inlet branch pipe; 7. Regulating valve; 8. Vertical centrifugal pump; 9. Pneumatic shut-off valve; 10. Pneumatic shut-off valve; 11. Processing tank; 12. Return pipe; 13. Transfer pump; 14. Intermediate storage tank; 15. Level gauge; 16. Outlet branch pipe; 17. Circular through-hole; 18. Outlet 19. Main liquid pipe; 20. Steam / compressed air outlet main pipe; 21. Steam / compressed air outlet branch pipe; 22. Steam / compressed air pipeline; 23. Tank body; 24. Liquid outlet connection pipe; 25. Stainless steel filter screen cylinder; 26. Cylindrical embedded seat; 27. Cover plate; 28. Liquid inlet connection pipe; 29. ​​Drain pipe; 30. Sealing cover; 31. Insert ring; 32. Conical opening; 33. Annular slot; 34. Rubber sealing ring. Detailed Implementation

[0022] Please see Figure 1-4 A serial cooling system for a reactor includes a reactor 1, a jacket 2 located on the outer wall of the reactor 1, a main inlet pipe 3 connected to the top of one side of the jacket 2, a distributor 4 connected to the inlet port of the main inlet pipe 3, cooling water inlet branch pipes 5 and chilled water inlet branch pipes 6 respectively connected to the two inlet ports of the distributor 4, a vertical centrifugal pump 8 and a pneumatic shut-off valve 9 correspondingly installed on the cooling water inlet branch pipes 5 and chilled water inlet branch pipes 6, and a cooling water inlet branch pipe connected to the bottom of one side of the jacket 2. The system includes a main outlet pipe 18, a pneumatic shut-off valve 10 installed on the main outlet pipe 18, a chilled water treatment unit and a cooling water treatment unit connected to the outlet port of the main outlet pipe 18 via a diversion valve; the inlet port of the cooling water inlet delivery branch pipe 5 is connected to the cooling water treatment unit, and the inlet port of the chilled water inlet delivery branch pipe 6 is connected to the chilled water treatment unit; the cooling water treatment unit and the cooling water inlet delivery branch pipe 5 form a cooling water circulation loop, and the chilled water treatment unit and the chilled water inlet delivery branch pipe 6 form a chilled water circulation loop.

[0023] Both the cooling water treatment unit and the chilled water treatment unit include an intermediate storage tank 14, a treatment tank 11, a return pipe 12 connecting the intermediate storage tank 14 and the treatment tank 11, a level gauge 15 installed in the intermediate storage tank 14, a transfer pump 13 installed on the return pipe 12 and interlocked with the level gauge 15, and an outlet delivery branch pipe 16 connected to the upper side of the intermediate storage tank 14. The inlet port of the outlet delivery branch pipe 16 is connected to the outlet port of the main outlet pipe 18. The intermediate storage tank 14 can temporarily store the medium flowing in from the main outlet pipe 18, avoiding load fluctuations caused by the medium directly entering the processing tank 11. The level gauge 15 can monitor the liquid level in the intermediate storage tank 14 in real time. When the liquid level reaches the set value, it automatically triggers the transfer pump 13 to start, and transports the medium to the processing tank 11 (cooling tower or chiller) through the return pipe 12 for processing, realizing automated control of medium transportation and reducing manual intervention. This closed-loop circulation structure ensures the continuous recycling of the cooling medium and improves the medium utilization rate. At the same time, the targeted treatment (cooling or freezing) of the medium by the processing tank 11 can ensure that the medium always meets the cooling requirements of the reactor. The two work together to make the entire cooling system operate more stably and efficiently, and can better adapt to various working conditions of the reactor.

[0024] The treatment tank 11 of the cooling water treatment unit is a cooling tower, which can achieve natural cooling of the cooling water by utilizing the heat exchange between air and water, and can meet the conventional cooling needs of the reactor; the treatment tank 11 of the chilled water treatment unit is a chiller, which can control the temperature of the chilled water in a lower range through mechanical refrigeration, and can meet the special requirements of the reactor for low-temperature cooling.

[0025] The intermediate storage tank 14 includes a tank body 22, an outlet connection pipe 23 connected to the bottom of one side of the tank body 22, an inlet connection mechanism located on the upper side of the tank body 22 and connected to the inlet port of the outlet delivery branch pipe 16, a stainless steel filter cylinder 24 tightly fitted to the lower side of the inlet connection mechanism and located inside the tank body 22, and a sludge discharge mechanism located on the lower side of the tank body 22 and corresponding to the stainless steel filter cylinder 24. The lower end of the stainless steel filter cylinder 24 is inserted into the lower side of the interior of the tank body 22. A level gauge 15 is located inside the tank body 22 and is spaced apart from the stainless steel filter cylinder 24. One end of the outlet connection pipe 23 is connected to the inlet port of the return pipe 12 through a flange. The inlet connection mechanism is connected to the outlet delivery branch pipe 16, and combined with the filtration function of the stainless steel filter cylinder 24, the medium entering the tank is filtered before storage, reducing the impact of impurities on subsequent circulation.

[0026] A circular through-hole 17 is provided on the upper side of the tank body 22. The liquid inlet connection mechanism includes a cylindrical insert 25 that inserts into the circular through-hole 17, a cover plate 26 that connects to the upper side of the cylindrical insert 25 and fits tightly against the upper side of the tank body 22, and a liquid inlet connection pipe 27 that communicates with the upper side of the cover plate 26. One end of the liquid inlet connection pipe 27 is connected to the liquid inlet port of the liquid outlet delivery branch pipe 16 through a flange, and the other end is connected to the cylindrical insert 25. An O-ring is provided at the gap between the cylindrical insert 25 and the circular through-hole 17. The cover plate 26 is fastened to the upper side of the tank body 22 with bolts. The O-ring can prevent the medium from leaking from the gap; the flange connection facilitates the disassembly and assembly of the liquid inlet connection pipe 27 and the liquid outlet delivery branch pipe 16, making operation convenient when maintenance or replacement of parts is required.

[0027] The lower side of the tank body 22 has a conical opening 31 that communicates with the stainless steel filter cylinder 24. The sewage discharge mechanism includes a sewage discharge pipe 28 located on the lower side of the tank body 22 and communicating with the conical opening 31, and a sealing cover 29 connected to the lower end of the sewage discharge pipe 28 via a flange. The sealing cover 29 and the flange of the sewage discharge pipe 28 are sealed by bolts. The inclined inner wall of the conical opening 31 can guide the impurities filtered by the stainless steel filter cylinder 24 to converge to the bottom, avoiding the accumulation of impurities in the tank. The sewage discharge pipe 28 is directly connected to the conical opening 31, providing a channel for the discharge of impurities. When sewage discharge is required, the sealing cover 29 can be opened to allow the impurities to slide into the sewage discharge pipe 28 along the conical opening 31 and be discharged.

[0028] The lower interior of the tank 22 has an annular slot 32 located around the conical opening 31. The lower end of the stainless steel filter cylinder 24 is connected to a matching insertion ring 30. The insertion ring 30 is inserted vertically downwards into the annular slot 32, forming a tight insertion fit. This insertion fit allows for quick positioning and fixation of the stainless steel filter cylinder 24 within the tank 22, preventing displacement or shaking due to media flow impact or equipment vibration. This ensures stable coverage of the media inflow path within the filtration area, guaranteeing effective interception of impurities in the cooling medium. Simultaneously, the insertion structure facilitates filter cylinder disassembly and replacement; when cleaning or replacing the filter cylinder, it can be easily removed upwards, simplifying maintenance. Furthermore, the tight fit between the annular slot 32 and the insertion ring 30 reduces the possibility of unfiltered media flowing directly into the bottom of the tank through gaps, further improving filtration efficiency.

[0029] Corrosion-resistant rubber sealing rings 33 are provided between the lower side of the cover plate 26 and the tank body 22, and between the sealing cover 29 and the drain pipe 28. The rubber sealing rings 33 are embedded in pre-set annular grooves in the cover plate 26 or the tank body 22, achieving a seal through the tight fit between the cover plate 26 and the tank body 22. The rubber sealing rings 33 at the lower ends of the sealing cover 29 and the drain pipe 28 are placed between the sealing surfaces of the two flanges, achieving a tight fit through the tightening force of the flange bolts. The rubber sealing rings 33 prevent external air, dust, etc., from entering the tank and contaminating the medium, ensuring the cleanliness of the cooling medium and ensuring the stable operation of the circulation system.

[0030] A steam / compressed air outlet main 19 is connected to the liquid outlet main 18. The steam / compressed air outlet main 19 is connected to two steam / compressed air outlet branch pipes 20 via a diversion valve. The two liquid inlet ports of the distributor 4 are respectively connected to steam / compressed air lines 21. The other ends of the two steam / compressed air lines 21 can be connected to a steam or compressed air source. Steam or compressed air enters the distributor 4 from the steam / compressed air lines 21, enters the jacket 2 of the reactor 1 through the liquid inlet conveying main 3, and exchanges heat with the reactor wall to achieve heating. Then, it flows from the liquid outlet main 18 into the steam / compressed air outlet main 19, and is discharged through the two steam / compressed air outlet branch pipes 20 via the diversion valve. This allows the steam or compressed air to flow fully in the jacket, ensuring uniform heating of the reactor. In addition, the heating function is achieved by using the existing pipelines, eliminating the need to lay additional heating pipelines, simplifying the system structure and reducing equipment costs.

[0031] Regulating valves 7 are installed on the cooling water inlet supply branch pipe 5, the chilled water inlet supply branch pipe 6, the two steam / compressed air lines 21, and the two outlet supply branch pipes 16. On the cooling water inlet supply branch pipe 5 and the chilled water inlet supply branch pipe 6, the regulating valves 7 are connected in series between the distributor 4 and the vertical centrifugal pump 8, respectively; on the two steam / compressed air lines 21, the regulating valves 7 are located near the inlet port of the distributor 4. Through the regulating valves 7, the flow rates of cooling water and chilled water can be remotely controlled and adjusted according to the real-time cooling requirements of the reactor 1, ensuring that the heat exchange efficiency within the jacket 2 matches the reactor temperature control.

[0032] Working Process and Principle: The system cools the reactor 1 through a cooling water circulation loop and a chilled water circulation loop. The two loops operate independently to prevent cross-contamination of the media. During operation, if cooling water is used, the vertical centrifugal pump 8 drives the cooling water in the cooling tower from the cooling water treatment unit through the cooling water inlet delivery branch pipe 5, distributor 4, and inlet delivery main pipe 3 into the jacket 2 of the reactor 1. After absorbing heat, the water flows out from the outlet main pipe 18, through the diversion valve into the outlet delivery branch pipe 16 of the cooling water treatment unit, and then into the intermediate storage tank 14. The level gauge 15 in the intermediate storage tank 14 is interlocked with the delivery pump 13. When the level reaches the set value, the delivery pump 13 starts, sending water through the return pipe 12 into the treatment tank 11 of the cooling tower for cooling. The cooled water then flows back to the cooling water inlet delivery branch pipe 5 to complete the circulation. If chilled water is used for cooling, the process is similar, except the medium is chilled water and the treatment tank 11 is a chiller. The stainless steel filter cylinder 24 in the intermediate storage tank 14 filters impurities in the medium, and these impurities can be periodically discharged through the drain mechanism. In addition, when heating the reactor 1, steam / compressed air can enter through the corresponding steam / compressed air pipeline 21; regulating valve 7, pneumatic shut-off valve 9 and pneumatic cut-off valve 10 can control the flow rate and on / off of the medium, further ensuring that the two circuits operate independently and realizing the anti-serialization function.

[0033] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A system for preventing serial cooling of a reactor, comprising a reactor (1), a sandwich (2) provided on the outer wall of the reactor (1), characterized in that, It also includes an inlet delivery main pipe (3) connected to the top of one side of the interlayer (2), a distributor (4) connected to the inlet port of the inlet delivery main pipe (3), cooling water inlet delivery branch pipes (5) and chilled water inlet delivery branch pipes (6) respectively connected to the two inlet ports of the distributor (4), a vertical centrifugal pump (8) and a pneumatic shut-off valve (9) respectively installed on the cooling water inlet delivery branch pipes (5) and chilled water inlet delivery branch pipes (6), an outlet main pipe (18) connected to the bottom of one side of the interlayer (2), and a valve installed on the outlet main pipe (18). The pipe section includes a pneumatic shut-off valve (10), a chilled water treatment unit connected to the outlet port of the main outlet pipe (18) via a diversion valve, and a cooling water treatment unit; the inlet port of the cooling water inlet delivery branch pipe (5) is connected to the cooling water treatment unit, and the inlet port of the chilled water inlet delivery branch pipe (6) is connected to the chilled water treatment unit; the cooling water treatment unit and the cooling water inlet delivery branch pipe (5) form a cooling water circulation loop, and the chilled water treatment unit and the chilled water inlet delivery branch pipe (6) form a chilled water circulation loop.

2. The system of claim 1, wherein, Both the cooling water treatment unit and the chilled water treatment unit include an intermediate storage tank (14), a treatment tank (11), a return pipe (12) connecting the intermediate storage tank (14) and the treatment tank (11), a level gauge (15) installed in the intermediate storage tank (14), a transfer pump (13) installed on the return pipe (12) and interlocked with the level gauge (15), and an outlet transfer branch pipe (16) connected to the upper side of the intermediate storage tank (14). The inlet port of the outlet transfer branch pipe (16) is connected to the outlet port of the outlet main pipe (18).

3. The system of claim 2, wherein, The treatment tank (11) of the cooling water treatment unit is a cooling tower, and the treatment tank (11) of the chilled water treatment unit is a chiller.

4. The system of claim 2, wherein, The intermediate storage tank (14) includes a tank body (22), an outlet connection pipe (23) connected to the bottom of one side of the tank body (22), an inlet connection mechanism located on the upper side of the tank body (22) and connected to the inlet port of the outlet delivery branch pipe (16), a stainless steel filter cylinder (24) tightly fitted to the lower side of the inlet connection mechanism and located inside the tank body (22), and a sewage discharge mechanism located on the lower side of the tank body (22) and corresponding to the stainless steel filter cylinder (24); the lower end of the stainless steel filter cylinder (24) is inserted into the lower side of the inside of the tank body (22); the level gauge (15) is located inside the tank body (22) and is spaced apart from the stainless steel filter cylinder (24); one end of the outlet connection pipe (23) is connected to the inlet port of the return pipe (12) through a flange.

5. The system of claim 4, wherein, The upper side of the tank body (22) is provided with a circular through hole (17); the liquid inlet connection mechanism includes a cylindrical insert (25) that is inserted into the circular through hole (17), a cover plate (26) that is connected to the upper side of the cylindrical insert (25) and tightly fitted to the upper side of the tank body (22), and a liquid inlet connection pipe (27) that is connected to the upper side of the cover plate (26); one end of the liquid inlet connection pipe (27) is connected to the liquid inlet port of the liquid outlet conveying branch pipe (16) through a flange, and the other end is connected to the cylindrical insert (25); an O-ring is provided at the gap between the cylindrical insert (25) and the circular through hole (17).

6. The system of claim 5, wherein, The tank (22) has a conical opening (31) on its lower side that communicates with the stainless steel filter cylinder (24); the sewage discharge mechanism includes a sewage pipe (28) located on the lower side of the tank (22) and communicating with the conical opening (31), and a sealing cover (29) connected to the lower end of the sewage pipe (28) via a flange.

7. The system of claim 6, wherein, The lower side of the tank (22) is provided with an annular slot (32) located around the conical opening (31), and the lower end of the stainless steel filter cylinder (24) is connected to a plug ring (30) that is compatible with the annular slot (32).

8. The system of claim 6, wherein, A rubber sealing ring (33) resistant to media corrosion is provided between the lower side of the cover plate (26) and the tank body (22), and between the sealing cover (29) and the drain pipe (28).

9. The system of claim 1, wherein, The main outlet pipe (18) is connected to a steam / compressed air outlet main pipe (19), which is connected to two steam / compressed air outlet branch pipes (20) through a diversion valve. The two inlet ports of the distributor (4) are respectively connected to steam / compressed air pipelines (21).

10. The system of claim 9, wherein, A regulating valve (7) is provided on each of the sections of the cooling water inlet delivery branch pipe (5), the chilled water inlet delivery branch pipe (6), the two steam / compressed air pipelines (21), and the two outlet delivery branch pipes (16).

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