ASME B16.3:2016 pdf download.Malleable Iron Threaded Fittings.
4 SIZE
4.1 Nominal Pipe Size
As applied in this Standard, the use of the phrase nominal pipe size” or the designation NPS followed by a dimensionless number is for the purpose of identifying the end connection of fittings. The number is not necessarily the same as the fitting inside diameter.
4.2 Reducing Fittings
For reducing tees, crosses, and Y-branches (laterals), the size of the largest run opening shall be given first, followed by the size of the opening at the opposite end of the run. Where the fitting is a tee or Y-branch (lateral), the size of the outlet is given last. Where the fitting is a cross, the largest side-outlet opening is the third dimension given, followed by the opposite opening. The straight-line sketches of Fig. 1 illustrate how the reducing fittings are read.
5 MARKING
5.1 Class 150 Fittings
Each Class 150 fitting shall be marked for identification with the manufacturer’s name or trademark. 5.2 Class 300 Fittings
Each Class 300 fitting shall be marked for identification with
(a) the manufacturer’s name or trademark
(b)the numerals 300w
(c)the letters “MId to designate malleable iron
(d) the size
(e)other markings as permitted by MSS SP-25
6 MATERIAL
6.1 Malleable Iron
The chemical and physical properties of the castings shall be in accordance with ASTM A197. The rnanufacturer shall be prepared to certify that the product has been so produced.
6.2 Steel
10 PLUGS, BUSHINGS. AND LOCKNUTS
For dimensions of plugs, bushings, and locknuts to be used in connection with Classes 150 and 300 malleable iron threaded fittings, see ASME B16.14.
11 FACE BEVEL
A bevel not exceeding 5 deg is permitted on the faces of fitting openings. Center-to-end, end-to-end, and width of band dimensions may include or exclude the bevel.
12 COATINGS
12.1 Malleable Iron Fittings
When malleable iron fittings are zinc coated, they shall be hot dipped in accordance with ASTM A153 or have an electrodeposited zinc coating conforming to ASTM B633, Type I, Service Condition 4. Hot-dipped coatings shall be 0.864 mm (0.0034 in.) minimum thickness and applied prior to threading. Electrodeposited zinc shall be 0.025 mm (0.001 in.) minimum thickness and may be applied either before or after threading.
12.2 Steel Fittings
Couplings and caps made from steel rod or bar may have electrodeposited zinc coatings conforming to ASTM B633, Type I. Service Condition 4. The electrodeposited coatings may be applied either before or after threading.
12.3 Other Coatings
Other coatings specified by the purchaser shall be furnished meeting the agreed requirements.ASME B16.3 pdf download.