A lining protects the inside of a fitting from the water or wastewater it carries. A coating protects the outside from the soil or air around it. A standard SIGMA fitting has both: a cement mortar lining with an asphaltic seal coat inside, and an asphaltic coating outside (red primer on flanged fittings).
SIGMA's lining bulletin recommends a ceramic epoxy lining, or an equal, for sewer service, and says not to use standard cement-lined fittings there. For other wastewater service, send the spec with the RFQ so the lining can be matched to it.
SIGMA does not recommend pressure washing standard cement-lined fittings, because it can damage the lining. If the fittings need cleaning, call 800.999.2550 first. Handle lined fittings from the outside, with no forklift forks inside the fitting.
On a fitting page, pick the coating under Coating to see the item number and, where one is posted, its price list. Take an 8 in. C153 MJ tee, import: DMT88 standard, DMT88B bare, EDMT88 FBE, 4-DMT88 ceramic epoxy lined, DMT88Z zinc, 4-DMT88Z ceramic epoxy and zinc. Domestic adds D- in front (D-DMT88, D-DMT88B, D-EDMT88, D-DMT88Z), or D4- for ceramic epoxy lined (D4-DMT88).
Send the spec with the RFQ. Your regional team checks whether SIGMA can supply the primer or coating it calls for, and quotes it for the job if so.
SIGMA Z-COAT is zinc-rich paint applied per ISO 8179-2. Arc zinc, per ISO 8179-1, is sprayed on molten. The SIGMA Z-COAT page compares the two.
Specifying a coating?
Send the coating and lining spec with the RFQ to your regional team, or to the plant team for a treatment plant job.
