11.3NORTHERN SPECIALTY – 04/11/02

FABRICATED FITTINGS

There is no ASTM for fabricated fittingdimensions. However, the pipe used tofabricate Northern Specialty’s fittingscomply with AWWA C906-90 andASTM D-1 248 requirements for TypeIII, Class C, Category 5, Grade P3408polyethylene material. Other referencespecifications include: ASTM 714,ASTM D-3350, ASTM D-3035.

Mitered fittings are manufac-tured from angular cut pipe segments.Due to this configuration, stresses aregreater than those imposed on pipe ofthe same size and DR. In order to sup-ply mitered fittings that will meet orexceed the design pressure of the pip-ing system, Northern Specialty will man-ufacture the fittings(s) from heavier wallpipe 25% greater than that of the pipe.The fitting outlet ends may bemachined to the desired DR.

Fabricated fittings intendedfor use in industrial non-pressureand/or low pressure services shall bemanufactured from the same diameterand DR rating as used in the pipingsystem. The pressure rating of thesefittings is approximately 75% ofstraight pipe of the same DR.

Fabricated fittings can be sup-plied with either flanged, screwed,grooved and/or plain end for field buttfusion to the piping system. NorthernSpecialty can also fiberglass wrap thefitting(s) and/or remove the internalbead when needed.

INSTALLATION PRECAUTIONS

Fabricated fittings require that certainprecautions be taken when installingthem into a piping system.

Northern Specialty recommendsthat the installer use spreader bars ornylon straps to help prevent damagingmitered fittings. It is strongly recom-mended that for installations involvinglong sections of butt fused pipe, thefittings should have at least one endflanged on the main, to allow for postassembly alignment.

TESTING

AWWAWhen needed for AWWA, fittings shallbe prepared and tested according toASTM D1598 test method. The fittingshall survive, without failure, a testpressure of four (4) times the pipepressure class when the test pressure isapplied for five (5) seconds. Fittingswill comply with AWWA C901, C906,and AWWA Section 4.5.1, 4.5.2.,2.2.9., 2.2.1.. The first fitting of a par-ticular size and configuration madeduring a production run, and thereafterevery fiftieth fitting, will be subjectedto the five-second pressure test.

Custom testing required by end user.Northern Specialty will test fittings asneeded by the end user.

SPECIFICATIONS FOR HIGH DENSITY POLYETHYLENE FITTINGS

11.4NORTHERN SPECIALTY – 04/11/02

Quality Assurance.Northern Specialty will comply withfusion procedures set forth by the pipemanufacturer(s), fusion equipmentmanufacturer(s), Title 49, Code ofFederal Regulations 192.283, PlasticPipe Institute TR-33, AWWA Section2.4.2., and ASTM D3261. The use ofMcElroy DataLoggers for fusion moni-toring shall be used in production runsfor 6” - 63” fittings.

Northern Specialty shall takeadequate measures in the checking ofincoming pipe to ensure the pipe isfree of cuts, scratches and other dam-ages. Each fitting shall be visuallychecked inside and outside for defects.Any presence of defects shall be causeto reject the fitting. .

MARKING REQUIREMENTS

Marking on the fitting shall include thefollowing whenever possible:

a. Nominal size and OD base(such as 12 in. IPS)

b. Standard material code designation (such as PE3408)

c. Dimension ratio (such as SDR-17)

d. Pressure class (such as PC40)

e. AWWA designation number (AWWA C906-90)

f. NSS production code

MOLDED FITTINGS

Northern Specialty is an authorized dis-tributor for Central Plastics Company.Please refer to the specifications listedby Central with regard to molded fit-tings and flange adapters. Centralproducts fully comply with ASTMD3261, D2683, D2513, API 15LE andANSI/AWWA C906-90, C901-90. ASTMF1055 D.O.T. 192.283.

SPECIFICATIONS FOR HIGH DENSITY POLYETHYLENE FITTINGS