How much friction loss should be added to any calculations involving master stream devices?

How much friction loss should be added to any calculations involving master stream devices?

• A. 75 kPa
• B. 175 kPa
• C. 350 kPa
• D. 560 kPa

Answer: (B)

When you calculate the pump discharge setup for a master stream, you need to include the additional head loss created by the master stream device itself. This device introduces friction that isn’t captured by hose friction calculations alone, so a fixed amount is added to compensate for that extra loss and ensure the pump can deliver the desired flow. That fixed friction loss is typically 25 psi, which is about 175 kPa. Using this value aligns the calculations with the real pressure losses caused by the device’s flow path, regardless of hose length or other variables. The other numbers would either under- or overestimate the device’s inherent loss, leading to improper pump pressure. So, the correct addition to calculations involving master stream devices is 175 kPa.

When you calculate the pump discharge setup for a master stream, you need to include the additional head loss created by the master stream device itself. This device introduces friction that isn’t captured by hose friction calculations alone, so a fixed amount is added to compensate for that extra loss and ensure the pump can deliver the desired flow.

That fixed friction loss is typically 25 psi, which is about 175 kPa. Using this value aligns the calculations with the real pressure losses caused by the device’s flow path, regardless of hose length or other variables. The other numbers would either under- or overestimate the device’s inherent loss, leading to improper pump pressure.

So, the correct addition to calculations involving master stream devices is 175 kPa.