Processing...

`WP = "h" * 1000 * g`

Enter a value for all fields

The **Pressure Head** calculator computes the pressure based on Gravity-Fed Water from a Tank.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**h**) Height of Reservoir or Rank above current position. - (
**ρ**) Density of Fluid (e.g. water 1000 kg/m^{3})

**Fluid Pressure (WP): **The pressure is returned in pounds per square inch (PSI). However, this can be automatically converted to compatible units via the pull-down menu.

The calculator computes the water pressure (**p**) that can be realized below a tank based on the height of storage. The pressure is returned in pounds force per square inch (lbs/in^{2}) which is equivalent to pounds per square inch (PSI). The pressure from an elevated tank of water due only on the flow caused by gravity can be calculated based on the Pressure Head equation. It is mathematically expressed as:

`h = p/gamma = p/ (rho * g)`

where

- h = pressure head (Length, typically in units of m);
- p = fluid pressure (force per unit area, often as Pa units); and
- `gamma` is the specific weight (force per unit volume, typically N/m
^{3}units) - ρ = density of the fluid (mass per unit volume, typically kg/m
^{3}) - g = acceleration due to gravity (rate of change of velocity, given in m/s
^{2})

In this equation, `rho` is 1,000 kg/m^{3} for the mean density of fresh water, and `g` is 9.8 m/s^{2}.

Solving for `p` (fluid pressure):

`p = psi * rho * g` or applying the constants and units `p = psi_m * 1000_("kg/"m^3) * 9.8_("m/"s^2)`

**Rolling Offsets (Run and Travel)**– The Rolling Offset**Rolling Offset Lengths**function computes the run and travel length a rolling offset based on the offsets and fittings. (see diagram).**Pipe Grading****Diagonal of a Square**- This is a simple calculation to assist in computing the diagonal of a square.**Diagonal of a Box**- This computes the length of the diagonal of a box (**T**) based on sides of length**R, S**and**U**.**Flow Rate**- This computes flow rate based on the total volume and the time it took to accumulate.**Pipe Flow Volume**- This computes the total volume from a pipe based on the flow rated and the duration of flow.**Weight of Water in a Tank**- Computes the weight of water in a cylindrical tank based on the radius and height (or length).**Weight of sea water in pipe**- Computes the weight of sea water in a cylinder based on the radius and height (or length)**Pressure Head**- The Potential Gravity-Fed Water Pressure from a Tank (a.k.a. Pressure Head) based on the height of storage.**Pipe Volume**- Computes the volume in a pipe**Pipe Contents Weight**- Computes the weight of liquid in a pipe.**Pipe Surface Area**- Computes the surface area of a pipe.**Pipe Grading**- Compute the drop needed over a run to maintain a grade (e.g., 4" over 12')**Volume of a Cylindrical Container**(e.g. hot water tanks),**Volume of a Spherical Container****Weight of Water in a Spherical Container****Volume of a Rectangular container****Weight of Water in a Rectangular Container****Capillary Rise**- The height of water in a small tube due to capillary force.**Snow Water Equivalence**- The volume of water created by an area and depth of snow.**Pore Water Pressure**- Pressure of uplift from the water table.