×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Force on a Toilet by Obese Individual

## Force on a Toilet by Obese Individual

(OP)
I have a client who has an employee who is in the range of 500 lb.

We wanting to specify a stainless steel toilet, typically used for bariatric patients in a hospital.  The client is not too pleased with the look and wants a vitreous china unit.

We can find floor set vitreous china units rated for 1000 lb and 2000 lb static loads.

Our concern is if the employee were to "fall" and sit down forcefully on the toilet.

I can calculate the momentum he would generate, but not sure how to translate this in to force and add it to his 500 lb weight (force).

Conservation of momentum will not work since the toilet is generally not going to move.

I am thinking of just specifying the 2000 lb unit and be done with it.

Any ideas.

### RE: Force on a Toilet by Obese Individual

Force=1/2mV^2  so if you guess around 3ft/sec you get 9*500/2=

2250lbf, good luck with the fatty.

### RE: Force on a Toilet by Obese Individual

1/2mV2 is Kinetic energy

However, you can take a similar approach.  Assume that 400 of the pounds (most of weight is above the hips) falls 2ft onto the toilet.  Assume that there's a 3-in stopping distance because of the fat.

400lb*g*2ft/3-in = 3200lbf, that's about 8g's so it's a bit high, but it only lasts for about 44 ms.

### RE: Force on a Toilet by Obese Individual

(OP)
Got some information from the manufacturer.

They drop a 1000 lb bag (for plop factor) from 5 feet and 10 feet.

That is a lot of momentum that hits that plumbing fixture.

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

#### Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!