wall pipes vs. sleeves 1

[vodeni]

I am interested in hearing your experience in using wall pipes versus using wall sleeves for penetration of D.I. pipes through new construction. Pro and contra for each method. Thank you all!

 

[SteveWag]

I prefer sleeves or in most cases a formed round holes. It eliminates two joints. Anything that projects beyond the face of the wall will make the formwork very hard. Flush wall pipes need to be custom made to match the wall and don’t work well for round or curved walls. If you use tapped flanges flush with the wall, then it’s not just getting the position right, the piping/form guys need to get it right rotationally. In difficult work I use stainless pipe with a welded ring or two to form the opening. The only thing I have found to seal the passing pipe to the hole or sleeve is the Thunderline Link Seal system. They can stand high temperatures, and can be fire stops. They are available with 316 stainless steel and Viton make-up. If the wall is more than 12-inches thick I use two rows of seals and install them so as to allow tightening from the “dry” side.

Steve Wagner

 

[rconner]

Many manufacturer's provide many different sorts of wall pipes, sleeves, and devices (see e.g. accessible from portal at

http://www.acipco.com/adip/specials/wall/),

as well as plain pipes that are slipped inside/used in conjunction with various encirling rubber boots or link/type-seals etc. They provide these devices as specified by the project Engineer at various concrete wall or manhole penetrations.
If it is desirable however to externally/axially anchor/transfer thrust from a nearby thrust focus, e.g. from a nearby valve in an otherwise unrestrained pressure pipeline to a reinforced concrete thrust wall so as to prevent the piping from any jacking back and forth movement, I guess this may be easier to do with a wall pipe or special restrained joint sleeve with a raised external "thrust collar" than with an unrestrained boot or unrestrained link-seal device.

 

[stanier]

Where DI pipe is flanged getting the sleeve installed in the right position is impossible for today's quality of labour. Also the delays in waiting for flanged spools is too long for impatient site engineers. The civil contractors like to leave block-outs, assemble the piping and then fill in the block out. The DI pipe is fitted with a puddle flange and a hydrophillic seal to stop leaks.

If you can be assured of a good installation puddle flanges with Link Seals work. Depending on the fluid (sewage, sea water etc) the puddle flange is required in a corrosion resistant materials.

Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng

http://www.waterhammer.bigblog.com.au

 

[rconner]

Hi stanier,
While there is of course normally nothing wrong with proper applications of the "block outs" you describe, in the USA I believe some ductile iron manufacturers and/or fabricators can sometimes be quite responsive to e.g. expeditious production of special length spools, particularly when there is a critical need. Also, many different types of devices and means are available from various USA vendors that can essentially make the installation of ductile iron piping "field adaptable" (e.g. from the length perspective), such that even restrained joint piping inside or outside of walls can be quickly "cut to suit"/cut to length in the field). In the smaller diameter sizes e.g. in sizes up to 36" (~900mm) this can even be accomplished where needed with some piping styles and effective restraining devices that do not require field welding nor labor intensive and/or reliant bolting/rodding etc.
Field adaptability in even the very largest ductile iron pipe sizes can also be accomplished, and even with axial restraint capability if required in the layout, but the latter normally requires either field welding of rings or beads etc. with special welding materials, or special pipes fitted beyond cutting locations with special glands and or separate couplings etc. for rod harness restraining etc. Judicious use of such field adaptability can perhaps satisfy some impatience, by minimizing or eliminating need for unanticipated, special length "flanged spools".