ASME B16.36:1996 pdf free download

ASME B16.36:1996 pdf free download ORIFICE LANCES
6 FLANGE FACING FINISH The finish of contact faces shall conform to the requirements of ASME B16.5.
7 GASKETS FOR RAISED FACE FLANGES
7.1 Gasket Thickness thick gaskets.’ Flange dimensions are based on the use of 0.06 in.
7.2 Gasket Thickness If gaskets of differing hardness and compressibility are used, the rules of Annex E of ASME B16.5 shall govern.
8 PRESSURE TAPS
8.1 General Each orifice flange is provided with two pressure tap holes extending radially from the outside diameter of the flange to the inside diameter of the flange. Comer taps may be used on NPS 1p2 and smaller if space permits. See Fig. 1. For ring joint flanges listed in Tables 2 through 6, where radial taps will interfere with the ring groove, angular meter taps, as illustrated in Fig. 3, will be required. Each pressure tap hole shall be equipped with a pipe plug.
8.2 Location The 0.94 in. locating dimension for raised face and 0.75 in. for ring joint’ shall be measured at the bore.
8.3 Pipe Connection Unless otherwise specified, pressure tap holes may be either tapped v2 NPT or v2 NPS socket connection in accordance with AME B16.11. When the location of the pressure tap with respect to the orifice plate is critical for the service and metering conditions, its location may be altered to accomodate other than 0.06 in. thick gaskets or ring type joint gaskets whose thickness may vary from that listed in Tables 2, 3, 4, 5, and 6. The alteration of location may also be accomplished by the removal of 0.06 in. from the raised face of the flange. If an original 0.06 in. high raised face is removed, the user is cautioned to limit the outside. diameter of the gasket or orifice plate to the tabulated R dimension. ORIFICE FLANGES
9 JACK SCREW PROVISION
9.1 Location Each flange shail have a machine bolt mounted in a hole drilled on the flange center line at 90 deg. from the pressure taps, for use as a jack screw. Machine bolt shall be regular with one heavy hex nut. See Fig. 2.
9.2 Slot for Nut A slot shall be provided in the flange 0.06 in. wider than the width across flats of the nut. The depth of the slot shall admit the nut so that there is no interference with the joining of the flanges when bolted together without orifice plate. 9.3 Tapped Hole As an alternative to para. 9.2., a tapped hole may be provided and the hex nut omitted when agreed on between the purchaser and the manufacturer. 10 DIMENSIONS 10.1 Flange Dimensions Dimensions are listed in Tables 1, 2, 3, 4, 5, and 6. 10.2 Gasket Dimensions Gasket dimensions shall be in accordance with Ap- pendix E of ASME B16.5.
11 FLANGE THREADS Threaded flanges shall have an American National Standard taper pipe thread conforming to ASME B1.20.1.
(a) The thread shall be concentric with the axis of the flange. Variations in alignment shall not exceed 0.06 in./ft. (0.5%).
(b) The flanges are made with counterbores at the back of the flange and the threads shall be chamfered to the diameter of the counterbore at an angle of approximately 45 deg. with the axis of the thread to afford easy entrance in making a joint. The counterbore and chamfer shall be concentric with the thread.
(c) In order to permit the pipe to be inserted to the face of the flange, the threads should have full root diameters through to the face of the flange, or shall have a counterbore at the face of the flange.