Discussion on pipeline length procurement
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Recently, we have been calculating the planned purchases for pipeline materials. When making these purchases, it is necessary to order a certain amount in excess to avoid running short later on. For example, for DN200 pipelines, if 204 meters are actually needed, and a 7% margin is taken into account, how many meters should be ordered?
When you plan to purchase DN200 pipes and actually need 204 meters, if you want to leave a 7% margin, you should buy more. This 7% margin should be 7% of the required pipe length; in other words, the length of pipe that needs to be purchased = the actual required length + 7% of the actual required length. Therefore, the length of pipes to be purchased = 204 meters + 204 meters * 7% = 218.28 meters. Given that pipes are generally sold in whole-meter units and rounding up is usually necessary, you should purchase 219 meters of pipe. However, in such cases, for safety reasons, it is recommended to discuss the details with the supplier to determine the most appropriate purchase quantity. .
The delivery length for DN200 pipes is usually 4–10 meters; the PO can be determined based on the single-line diagram. A margin of 7% is too high; typically, it’s 3–5%.
Hello, thank you for your reply. I’m a beginner and this is my first time calculating the length of pipes. If the required length is 204 meters and a 5% margin is needed, how many meters should be purchased? Is it 204x(1+0.05) = 214 meters?
Purchasing cannot be handled in this way; otherwise, even adding 5% would not be enough. You need to determine the number of PO units based on the single-line diagram, or design a breakdown such as: how many units for 10 meters, how many for 8 meters, and so on for 6 meters and 4 meters; then purchase an extra unit of 8 meters or 10 meters as a spare.
I drew the single-line diagram by referring to previous projects; I don’t know what PO means. The length of the pipes was calculated by adding up the relevant values myself. I’m not sure what amount of margin to include. As you mentioned, there are two methods: one is to add 3-5% to the actual length, and the other is to round up to the nearest whole number of pipes and purchase one or several extra pipes
PO stands for Purchase Order, which is an order to make a purchase. What I mean is, to determine the PO amounts based on the schematic diagram; for example: 12 units of 10 meters, 5 units of 8 meters, 6 units of 6 meters, and 2 units of 4 meters. The total is 204 meters, with one additional unit of either 8 meters or 10 meters ordered as a spare. Otherwise, if purchased in a total amount of 204 meters, it will eventually get out of control.
Okay, I understand. Thank you for the advice