×
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.

# How to convert Nspt=50/220mm to Nspt in scale of 100

## How to convert Nspt=50/220mm to Nspt in scale of 100

(OP)
I have a data of bore logs (Nspt). But most of data has ended in, e.g. Nspt of 50/220mm or else in scale of 50. How can I convert this data to Nspt value in scale of 100? Because I have to generate Nspt into shear wave velocities in order to analyzing soil amplification (ground motion). Thank you.

### RE: How to convert Nspt=50/220mm to Nspt in scale of 100

In Japan they convert it to 100/440mm(just double it, and that is not a formal or offical rule.) but it cannot be treated correct answer.
Because, even u blow 100 times it is not clear it can penetrate upto 440mm like the preceding if u blow 100times then it can be penerated upto over 440mm.......
So in my opinion it is more reasonable that just use 50 as it's maximum or using other downhole test.

### RE: How to convert Nspt=50/220mm to Nspt in scale of 100

(OP)
Thank you, for your response. I know if I doubled that will not be good. What I mean is in order 1 to 100 (blows/300mm). My next analysis is based on blows/300mm of Nspt value in order 1 to 100.

What if I interpolate linearly to defined Nspt in scale of 100 (blows/300mm). For example:
--> Nspt=50/220mm
--> 50 + 50[(300/300)-(220mm/300mm)]=63 (blows/300mm)

I think this is more resonable than I doubled it. Is it right or not?
Thank you.

### RE: How to convert Nspt=50/220mm to Nspt in scale of 100

I also asked that question b4 in this forum so u can find it with advanced search on this site.
In advanced search type "chunil" into keywords and then tag button on "Handle".
Then u can find...What i posted b4~
^_^

### RE: How to convert Nspt=50/220mm to Nspt in scale of 100

(OP)
Yeah I get that..but still blur for me. What is ur oppinion to my extrapolate?
TQ

### RE: How to convert Nspt=50/220mm to Nspt in scale of 100

If u should have the converted value...
Then urs a reasonable ..
and if i were then i would solve it in this way...
50:220 = x:300
then X = 68.18 and I will use 68 for the value.

But not sure.....
-_-.....
Good Luck..~ ^_^

### RE: How to convert Nspt=50/220mm to Nspt in scale of 100

(OP)
If there is no relationship, I think I dont have any choice. I know that value will be conservative. If somebody know something about it please let me know.
Thank you and Thanks Chunil.

#### 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

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
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industryâ€™s greatest assetâ€”real-time dataâ€”is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. 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!