Table of Contents

## What is the relation between flow and pressure?

This relationship can be expressed by the equation F = Q/t. Fluid flow requires a pressure gradient (Î”P) between two points such that flow is directly proportional to the pressure differential. Higher pressure differences will drive greater flow rates. The pressure gradient establishes the direction of flow.

**What is the relationship between steam and pressure?**

The higher the pressure of a boiler the more heat must be applied to make steam. With the increased pressure, you in turn get steam at higher temperatures. Higher temperature steam contains more energy per pound, which is known as Enthalpy.

### How do you calculate steam flow from pressure?

Using the Steam Property Calculator, properties are determined using Steam Pressure and Quality = 0 (Saturated Liquid)….The Specific Enthalpy is then multiplied by the Mass Flow to get the Energy Flow:

- Pressure = 852.9 psig.
- Quality = 0.00.
- [Steam Property Calculator] => Specific Enthalpy = 521.4 btu/lbm.

**Can you have pressure without flow?**

Flow rates are often referred to in gallons per minute or GPM. There are some smaller pumps that rate flow at gallons per hour or even gallons per day, outputting extremely small amounts of fluid over a given time. Pump pressure, however, is a measure of resistance to flow. Without flow, there is no pressure.

## Does pressure affect flow?

Pressure is the cause. Flow rate is the effect. Higher pressure causes increased flow rate. If the flow rate increases, it is caused by increased pressure.

**Does steam create pressure?**

This excess energy raises the pressure, in turn allowing the saturation temperature to rise, as the temperature of saturated steam correlates to its pressure. This is the amount of heat required to change the state of water at its boiling temperature, into steam.

### What is the critical pressure of steam?

22.12 MPa

The critical pressure and critical temperature of water and steam are 22.12 MPa and 647.14 K, respectively. Any boiler that operates below the critical point is called a subcritical boiler, and one that operates above the critical point is known as a supercritical boiler.

**How do I reduce steam loss?**

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- Recover and use heat from industrial furnaces:
- Use heat cascading:
- Use proper heating methods:
- Use proper furnace insulation and maintenance techniques:
- Reduce flue gas oxygen content:
- Reduce steam demand:
- Use alternate fuel:
- Improve boiler efficiency:

## Can you convert pressure to flow rate?

Since PSI is a measure of pressure and GPM is a measure of flow rate, we can not directly convert one into another. However, we can use Bernoulli’s equation for an incompressible fluid to calculate the flow rate in GPM if certain other variables are known.