Bolt Sizes for PN10 Flanges and anchor bolts

Dear Frineds

Can any body help me what are the galvanized iron bolt sizes to be used with PN 10 flanges. I have a pumping station for a raw sewage water treatment plant with PN10 valves and pipes. How much clearance should I use between bolts and flange holes. is 2 mm enough.
Does anyone have a chart for the anchor bolts sizes to concrete foundation, how much hole should I specify in the concrete base.

You quick reply will be highly appreciated

Regards

Basha

fyi perhaps the data at www.acipco.com/international/pip ... nge/fd.cfm may be of some help to you (see also that English/inch equivalent bolting for use in PN flanges is also available in this reference, where tha tinformation might also be helkpful)