How do you calculate vacuum pump capacity?

To calculate the pump capacity required to bring the vacuum to a higher level, we convert the vacuum levels quoted to absolute terms:

  1. P1 = 29.92 – 22 = 7.92” HgA.
  2. P2 = 29.92 – 26 = 3.92” HgA.

How do you calculate vacuum?

Vacuum is defined as air pressure below atmospheric pressure

  1. 0% vacuum = 760 torr = 14.7 psia = 29.92 inc mercury abs = 101.4 kPa abs.
  2. 50% vacuum = 380 torr = 7.3 psia = 15 inc mercury abs = 50.8 kPa abs.
  3. 99.9% vacuum = 1 torr = 0.01934 psia = 0.03937 inc mercury abs = 1.3 kPa abs.

How do you calculate pump size?


  1. Flow Rate (Q) =Q1x1.
  2. Actual Total Head (After Friction Losses) (H) = (h1+h2)+((h1+h2)xf)
  3. Actual Total Head (After Friction Losses) (H)=50+(50×30%)= 65 Meter.
  4. Pump Hydraulic Power (ph) = (D x Q x H x9.
  5. Pump Hydraulic Power (ph) = (1000 x 0.005 x 65 x9.
  6. Motor/ Pump Shaft Power (ps)= ph / pe = 3 / 80% = 4KW.

How do you calculate vacuum suction pressure?

For a vertical vacuum cup moving a load in a vertical direction: F = (m/µ) × (g + a) × S. Typically, in such an orientation, the safety factor should be 2.0 or greater….Coefficient of friction.

  1. Oily surface = 0.1.
  2. Moist or wet surface = 0.2 to 0.4.
  3. Glass, stone and dry plastic = 0.5.
  4. Rough surfaces = 0.6.

What is CFM in vacuum pump?

The first is the term CFM which stands for Cubic Feet per Minute. This is a measurement of the speed of the vacuum flow. This can be equated to a car’s top speed. You’ll see this term most often on electric rotary vane pumps or piston pumps (reverse air compressors).

How do I choose a vacuum pump?

When choosing a vacuum pump, first determine the level of vacuum/pressure required. Laboratory/Filtration Vacuum pumps are general and specific purpose pumps for applications in the laboratory or anywhere a low vacuum is needed. Most laboratory/filtration pumps have vacuum and pressure capabilities.

How do you calculate CFM for a vacuum pump?

Cubic Feet per Minute (cfm) or Cubic Meters per Hour (m3/h) are the two standard measurements. The number corresponds to the volume of the suction chamber multiplied by the pump revolutions in the time unit and by a correction coefficient which is usually 0.85.

What is vacuum pump CFM?

CFM or Cubic Feet per Minute is the measure of air flowing through a vacuum system. CFM is the the speed of the air flow. CFM equates to a car’s top speed. Suction Lift is the measurement of the vacuum’s ultimate power. A pump is constantly trying to create a vacuum.

What is the pump head calculation?

The pump head H=z+hw z is the height difference of the pumping height, that is, the water level from the inlet to the water surface at the exit. Hw is the head loss, including the Darcy formula or Xie Cai formula for calculating the head loss hf and the local head loss hw hf along the path.

What is pump capacity?

Pump capacity is a term used to define the flow rate through a pump at its designed conditions. It describes the volume of liquid that is allowed to travel through the pump in a given time. Some of the most common units of pump capacity are: Gallons per minute (gpm) Liters/minute (L/min)

What is 2 stage vacuum pump?

A two stage design has two rotors and vanes. This means that the first stage generates vacuum and the second stage cleans the system, leading to a deeper ultimate vacuum level. As a result, two stage pumps can produce a deeper vacuum than single stage pumps.

What is a good cfm for a vacuum?

We know that a good vacuum has a balanced CFM and water lift rating – so what do good numbers look like? A strong air flow rating is around 125 CFM and higher. This is strong enough air flow to pick up most anything you may work with – including dust from 5″ or smaller grinders.