ASME B73.1-2012 pdf – Specification for Horizontal End Suction Centrifugal Pumps for Chemical Process.
5.8 Materials of Construction
5.8.1 General The identifying material of a pump shall be that of which the casing is constructed. The pump material classification code in Table shall be used to specify the pump materials of construction. The pump part materials shall be in accordance with the specific ASTM material specifications in Table for each of the listed material designations. Other materials shall be agreed upon by the purchaser and the supplier. No repair by plugging, peening, or impregnation is allowed on any parts wetted by the pumped fluid.
5.8.2 Gland Mechanical seal gland materials shall be in accordance with the ASTM designations in Table with 316 SS as a minimum. If wetted by the pumped fluid and the casing is a higher alloy than 316 SS, the gland shall be constructed of the same material specified for the casing or, with purchaser approval, a material having an equivalent or better corrosion resistance. Gland bolt, stud, and nut materials shall be in accordance with the ASTM designations in Table, with 304 SS as a minimum. Grade B7 and Grade 2H carbon steel are not allowed for gland bolt, stud, and nut materials.
5.8.3 Auxiliary Piping Auxiliary piping shall, as a minimum, be available with the materials of construction in accordance with Table Auxiliary piping in contact with the pumped fluid shall have a pressure—temperature rating equal to, or greater than, the maximum allowable working pressure (MAWP) of the pump. Auxiliary piping that may become exposed to pumped fluid in the event of a seal failure shall meet this requirement. Auxiliary piping and components normally in contact with the pumped fluid shall have a
corrosion resistance to the pumped fluid that is equal to, or greater than, that of the casing.
5.9 Corrosion Allowance
The casing, cover, and gland shall have a corrosion allowance of at least 0.12 in. (3.0 mm).
5.10 Direction of Rotation
Direction of rotation shall be clockwise when viewed from the coupling end. An arrow showing the direction of rotation shall be provided, either cast on the casing or stamped on a plate of durable construction affixed to the pump in a prominent location.
5.11 Dimensions
Pump dimensions shall conform to Table 1-1. Baseplate dimensions shall conform to Table 1-2.
5.12 Miscellaneous Design Features
5.12.1 Safety Guards. Each coupling shall be furnished with a coupling guard. The coupling guard shall prevent personnel from contacting rotating components. An auxiliary guarding device to prevent personnel from contacting rotating components or to control spray from packing box/seal chamber leakage shall be provided if specified. Regional regulations and purchaser requirements may require additional guards. All guards shall meet the performance criteria of ANSI B11.19.
5.12.2 Threads. All threaded parts, such as bolts, nuts, and plugs, shall conform to ASME standards unless otherwise specified.
5.12.3 Lifting Rings. A lifting ring or other equivalent device shall be provided to facilitate handling the frame and associated assembly if its mass exceeds 60 lb (27 kg). The frame assembly lifting ring must not be used to lift the entire pump or assembly. Eyebolts on motors are not suitable for lifting the entire pump and motor assembly. The pump supplier’s instructions shall provide lifting instructions.
5.12.4 Tapped Openings. All tapped openings, including those in the mechanical seal gland that may be exposed to the pumped fluid under pressure, shall be plugged with threaded metal plugs. Plugs normally in contact with the pumped fluid shall be of the same generic material as the casing, except that carbon steel plugs may be used in ductile iron pumps. Threaded plugs shall not be used in the heating or cooling jackets, including glands with heating or cooling passages; instead, snap-in plugs or waterproof tape shall be used to relieve possible pressure accumulation until piping is installed.