ANSI LC-6-2008 pdf download Natural Gas Operated Diaphragm Pumps
1.5.2 Pipe threads, when provided, shall have a thread length not less than the value shown in Table I, Minimum Thread Length For American National Standard Pipe Threads, or Table II, Minimum Thread Length For British Standard Pipe Threads.
1.5.3 Pumps shall be designed to accept a wrench for use in assembly and disassembly to piping.
1.5.4 Inlet and outlet gas connections shall be designed so that when a pipe which is threaded two threads beyond standard (for the size in question) is run into the threaded portion of a pump body, it will not adversely affect the operation of the pump.
1.5.5 Connections for attachment to semirigid tubing shall comply with SAE specifications for automotive tube fittings as contained in the SAE Handbook.
1.5.6 Standard cast iron flange connections, when provided, shall be constructed in accordance with the dimensional specifications for 1 25 lb (56.7 kg) cast iron flanges of the Standard for Cast Iron Pipe Flanges and Flanged Fittings, Class 25, 125, 250, and 800, ANSI/ASME B16.1. Standard steel flange connections, when provided, shall be constructed in accordance with the dimensional specifications in the Standard for Pipe Flanges and Flanged Fittings: NPS 1 / 2 through 24, ANSI/ASME B16.5. Aluminum flange connections, when provided, shall be compatible with the dimensional specifications for 1 25 lb (56.7 kg) cast iron flanges of the Standard for Cast Iron Pipe Flanges and Flanged Fittings, Class 25, 125, 250 and 800, ANSI/ASME B16.1.
1.6 Bolts, Nuts And Screws Bolts, nuts, machine screws and other threaded parts used in covers, housings, casings and external mounting brackets shall have threads conforming to the Standard for Unified Inch Screw Threads (UN and UNR Thread Form), ANSI/ASME B1.1; the Standard for ISO General Purpose Screw Threads — Basic Profile, ISO 68; or the Standard for ISO General Purpose Metric Screw Threads — General Plan, ISO 261, as applicable.
1.7 Materials
1.7.1 The manufacturer shall supply evidence acceptable to the testing agency that all materials have been found to be suitable for their intended usage. Test data based on ASTM or other appropriate test procedures, certifications, or historical data may be submitted for this purpose. The evidence shall show that the materials have been evaluated, as appropriate for resistance to moisture, corrosion and the effects of fuel gases, including sulfur compounds therein, and that nonmetallic diaphragm and seal materials are suitably resistant to the effects of ozone.
1.7.2 For pumps containing parts intended for potable water, the manufacturer shall supply evidence satisfactory to the testing agency, that the materials used as protective coatings are suitable for the service, particularly with respect to toxicity, solubility, brittleness and temperature limits. Evidence of current certification under the Standard for Plastic Piping System Components and Related Materials, ANSI NSF 14, with appropriate end use, shall be deemed acceptable.