How to determine connection issues between two or three adjacent valve devices from a drawing
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Question: How can one determine from the drawings whether the flanges of two or three adjacent valves/instrumentation devices can be bolted together directly, or whether separate flanges are required with short pipes in between to isolate them? Can it be seen on the drawing? Is direct connection actually possible? Are there any standard criteria or factors to consider? For example, in my diagram A: 1 (gate valve), 2 (flow meter), 3 (gate valve). Can they be connected in series using bolts, with only 2 flanges added on the outside, or does each one require its own reverse flange, resulting in a total of 6 flanges? Figure B: 1 check valve, 2 (butterfly valve). Can they be connected in series using bolts directly, with only 2 flanges added on the outside, or does each one require its own reverse flange, resulting in a total of 2 flanges?
To determine from the drawings whether two or three adjacent valves or instrumentation devices can be connected directly by bolts, or whether they need to be connected with flanges and short pipes in between, several factors come into play: 1. **Port fitting type**: Check the type of connection ports on each device. Typically, the connection ports of a device are indicated on the drawings, showing whether there are flanges, threaded connections, or other types of connections. 2. **Installation requirements for valves and instruments**: Different types of valves and instruments may have specific installation clearance and orientation requirements, which can affect whether they can be connected directly. 3. **Operation and maintenance space**: Is it necessary to leave specific space for operation and maintenance between the devices? This may require the use of short pipes to achieve that. 4. **Pressure and fluid properties**: Consider the pressure level and chemical properties of the medium flowing through the valves and instruments, as these can affect the choice of connection methods. Regarding your specific example: - **Figure A (1 gate valve, 2 flow meter, 3 gate valve)**: Generally, a certain length of straight pipe is required at both ends of the flow meter to ensure accurate measurement; therefore, short pipes and flanges may be needed to separate each device, which means two flanges are required for each connection point, resulting in a total of 6 flanges. - **Figure B (1 check valve, 2 butterfly valve)**: If the check valve and the butterfly valve have the same dimensions and flange standards, and there are no special requirements regarding operating and maintenance space, they can in theory be connected directly using bolts – one flange on each end, resulting in a total of 2 flanges required. It is recommended to carefully review the specific device specifications and installation guides, and consult the manufacturer or experienced engineers to determine the best connection method. .
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This should be a flowchart; for installation, three-dimensional installation drawings, namely the “three views,” are required. For reference.
A, there should be straight pipes before and after the flow meter; connecting it directly to the valve isn’t appropriate.
Figure A: Direct connection is not possible; straight sections must be left before and after the flow meter, typically 10 days in front and 5 days behind; see the flow meter installation manual for details. Figure B: Connection is possible without any special requirements, but it is necessary to consider whether the bolts used for direct connection can pass through smoothly; if the butterfly valve is of the wafer type, it is advisable to connect them separately. Generally, there are no special requirements; it relies on on-site installation experience.
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Flow meters might not work; it is necessary to ensure straight pipe sections before and after them
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