hat
Yon tib Anpil ak andedan dyamèt mwens pase 50% nan dyamèt deyò nan ak epesè miray plis pase 25% nan dyamèt deyò, oswa avèk epesè miray plis pase 1 1/4 nan, oswa peze plis pase 90 lb / ft. yo difisil yo desine sou yon mandrèl. Se poutèt sa, dyamèt la insdie ka varye sou oswa anba pa yon kantite lajan ki egal a 10% nan epesè a miray la.
eng
A Many tubes with inside diameter less than 50 % of outside diameter of with wall thickness more than 25% of outside diameter, or with wall thickness over 1 1/4 in, or weighing more than 90 lb/ft. are difficult to draw over a mandrel. Therefore, the insdie diameter can vary over or under by an amount equal to 10 % of the wall thickness.