Conversion between PIW and N/mm

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Posted in: , on 16. Dec. 2010 - 07:07

Dear all:

I found A lot of data are introduce that the belts tension 450PIW equal to 800 N/mm in china.

I know that the PIW = Pound per inch of width of the belt,

the N/mm = N per millimeter of width of the belt,

but I always conversion is not accurate

I want to know how to conversion between PIW and N/mm,Thank you very much. ■

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Convert Piw And St Or Ep -- How To?

Posted on 16. Dec. 2010 - 08:55

Look at type of belt construction and necessary safety factor you wish to apply. By example:

Assume Steel Cord Belt that has a standard safety factor = 6.7:1

Steel cord is rated in ST- xxxx N/mm. This is the breaking strength of steel cords/ mm.

Assume Steel Cord rating is ST-1000 N/mm breaking strength

Then working strength is St-1000 N/mm / SF=6.7 = 149.25 N/mm working strength

We know PIW is ("Pounds per Inch of Width") a working tension per unit width.

Then we convert metric to English for ST-1000 N/mm to 852 PIW:

ST-1000 / 6.7 = 149.25 N/mm x ( 1 P/4.448 N) x (25.4 mm / 1 inch) = 852 PIW or 852 pounds/inch.

I hope. ■

Lawrence Nordell Conveyor Dynamics, Inc. website, email & phone contacts: www.conveyor-dynamics.com nordell@conveyor-dynamics.com phone: USA 360-671-2200 fax: USA 360-671-8450
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Thanks Lawrence

Posted on 16. Dec. 2010 - 02:28

thanks Lawrence,I am a chinese and very happy to know you,This is very good answer.

Quote Originally Posted by nordellView Post
Look at type of belt construction and necessary safety factor you wish to apply. By example:

Assume Steel Cord Belt that has a standard safety factor = 6.7:1

Steel cord is rated in ST- xxxx N/mm. This is the breaking strength of steel cords/ mm.

Assume Steel Cord rating is ST-1000 N/mm breaking strength

Then working strength is St-1000 N/mm / SF=6.7 = 149.25 N/mm working strength

We know PIW is ("Pounds per Inch of Width") a working tension per unit width.

Then we convert metric to English for ST-1000 N/mm to 852 PIW:

ST-1000 / 6.7 = 149.25 N/mm x ( 1 P/4.448 N) x (25.4 mm / 1 inch) = 852 PIW or 852 pounds/inch.

I hope.

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