COMPLIANCE INFO 1988 - 2000 - Laserfiche WebLink

Home Browse Search

02/22/99 17:51 N0.034 1?13 Piping system layout Trenching,bedding and backfilfing Althoa.igh li;aergiass pipe has excellent strength,it must be protected against impact which my occur from improper handling or during backfilling. • Provide a trench width equal to the pipe diameter pi us six inches on each side. Separate multiple lines by at least 4 inches.Peter to Fig.8-1. • Provide a minimum of 18 inches of select backfill between tate top of the pipe and unpaved ground surfaces. • Provide a minimum of 4 inches of select backfill between the top of the pipe and reinforced concrete pavement(4 Inches minimum thickness). • Provide a minimum of 8 inches of select backiiil between the top of thi pipe and asphalt pavement(2 inches minimum thickness). • Slope the trench bottom evenly from the dispensers backto sumps or tanks at a minimum'A Wft of slope. • The trench bottom must be free of hard or sharp ab)ects. • Grade the trench bottom with at least 6 inches of select backfill to provide firm, even support for the pipe.Compact the subgrade well to prevent differential settling. • Protect the pipe from impact during backfilling and abrasion during operation by surrounding it with four to six Inches of select backfill such as washed sand,pea gravel(fie-inch maximum)or cnrshed stone Ph-inch maximum). • Wrap pipe tying near concrete with rubber or foam padding to avoid direct contact with the concrete. I NaveAM --� avcr+xe 4(mint ` 1 a(min) (min) 4(mir, � CJ • � t Fig.6-1.Use onlysefectmamenafskv bedOV and baakfi fing Malay 30001L fuel I Med backfill a(miry handfingsysfams.Native materiels are rarefy suitaUs andshcu)d not be used. Matirb a(min) 6(rn(� sal i Frg.6-2.Dunrtgrayuut,bondingand lnspecdon,support tha piping on 2x4 blocks to keep rt�*jehrts craan j and to keep bedding cut ofrt7ep7pe, 7