# How does the 0.052 constant come from?

In the hydro-static pressure formula, if you use an oil field unit, you must see the hydro-static formula like this

Pressure, psi = 0.052 x Mud Weight (ppg) x TVD (ft)

I got the question asking about how the constant 0.052 is figured out.

What is 0.052?

0.052 is a constant used for converting ppg-ft into pound per square inch (lb/in2)

Do you know how it comes from? Let’s get started

First of all, the unit conversions that you need to know are as follows:

1 gallon = 231 cubic inch (inch3)

1 ft = 12 inch

Convert density from ppg (pound per gallon) to lb per cubic inch

Basic hydrostatic pressure

The constant can be determined by substituting the unit conversion.

The constant is 0.051948 and if we round it up, it will be 0.052.

### Related Post

Drill pipe pulled to lose hydrostatic pressure You previously learn about hydrostatic pressure lose due to pulling out of hole . This post will use the same concept but we will determine how many f...
Starting volume of original mud (weight up with He... You know how much volume will be increased due to adding  Hematite into the system; however, you sometimes are limited to total volume due to limit pi...
What is a trip tank? Trip Tank is a small metal tank with small capacity about 20-40 bbls with 1 bbl divisions inside and it is used to monitor the well. There are several...
Bulk Conversion Unit for Oilfield How many times are you asked about bulk conversion? I have heard people asking like this “How many sacks of barite are equal to 1 cubic of barite?”...
Share the joy
• 708
•
•
•
•
•
•
•
•
708
Shares

Working in the oil field and loving to share knowledge.

### 6 Responses to How does the 0.052 constant come from?

1. hamilton says:

Cool 🙂

2. Ahmed says:

Why don’t we consider the gravity acceleration in calculating the mud hydrustatic pressure ?

3. Candra says:

I have another one
Psi/ppg = 0.433/8,3 =0.051908
Slightly different, is it right?

4. Muhammed F. Mousa says:

thanks!

This site uses Akismet to reduce spam. Learn how your comment data is processed.