Series 1400 Nuclear Valve Spec Sheet
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ASME Class 2 and 3 Nuclear Safety Related Water Service Butterfly Valves
Valve shall be either Henry Pratt Company Series 1100 or Series 1400 or an approved equal. The valves shall be furnished under a current N-Stamp program, as applicable, and comply with the following details.
Valve Models & Sizes
Pratt 1100 (6" through 36" and larger as required)
Pratt 1400 (3" through 24")
Standard Pressure Class: ANSI 150 lb. Class
Special Pressure Class: For valves larger than 24", 75 psig service class, as permitted by ASME Sec. III Code Case 1678, also available.
Maximum Shut-off Pressure, for Bubble-tight Service: 200 psig.
Maximum Normal Service Temperature:
200oF for Pratt 1100 Valves.
300oF for Pratt 1400 Valves.
Class 1 for active and non-active services. The upset, emergency or faulted conditions will be analyzed concurrently with 5g seismic load applied simultaneously along three major axes. The stress levels will be maintained within the Code allowables.
Valve Operability Assurance
The manufacturers shall submit a program for providing the valve operability assurance requirement meeting the intent of NRC Reg. Guide 1.48. The program shall be submitted with the proposal describing the valves to be tested, type of testing and test conditions.
Valve Body: Valve body shall be flanged or prepared for welding to the adjacent pipe. The weld end preparation will be in accordance with the customer's design specifications. Flanges for valves up to 24" will conform to ANSI B16.5. Flanges for valves larger than 24" will be in accordance with Code Case 1678, Code Case 1702 or Code Case 1744 as applicable. Valve bodies with drilled and tapped holes will be suitable for Class 2B, alloy bolt thread series. Flange bolt holes drilled and tapped through entire body thickness are not acceptable. All valves shall be suitable for dead-end service. Wafer style valves are not acceptable.
Valve Disc: The disc shall be of fabricated or cast construction with no external ribs perpendicular to the flow. The carbon steel disc shall have stainless steel seating edge covering the full width of the seating surface. Sprayed or plated set surfaces are not permissible. The valve disc shall rotate 90o from full open to full closed position. The disc shall be mechanically locked to valve shaft.
Valve seats: Rubber seats shall be either permanently bonded to the valve body or will be mechanically retained in the valve body without use of threaded fasteners. Seats shall be field adjustable and replaceable, except in the case of rubber-lined bodies and permanently bonded seats. The rubber seat design shall have at least ten years of qualifying experience in similar application and shall have passed cycle life testing in accordance with AWWA C504, Para. 12.4.2. An affidavit of compliance with this testing will be furnished with proposal.
Valve Bearing: Valve bearing shall be sleeve type, installed in the valve body trunnions. Bearing shall be corrosion resistant.
Valve Shaft: The valve shaft may be a one-piece construction extending through valve disc or may be comprised of two-piece shafts inserted into disc hubs (stub shaft). If the shaft is of the two-piece design, each stub shaft shall be inserted in the valve disc hubs for minimum distance of 1o times shaft diameter. The shaft shall be finished to satisfy the requirements of the bearings and packing used. The valve shaft diameter shall not be reduced at the bearing or at the adaptation to the actuator.
Shaft Seals: The packing shall be of the self-adjusting rubber chevron type with a minimum of three rings in a set. The valves normally containing radioactive fluid shall have two independent sets of packing separated by a lantern ring and leak-off connection, tapped o" NPT and plugged. Shaft seals shall be replaceable without disturbing any part of the valve or valve actuator assembly.
Actuators: Manual actuators, unless otherwise specified, shall be capable of opening the valve against the design differential pressure and the resulting maximum dynamic torque with not more than 100 lb. pull on the handle or lever. Manual actuators shall have factory set travel limit stops at both ends of travel and shall be designed to withstand, without damage, a pull of 200 lbs. on the handwheel after stops are encountered. Power operated valves shall have actuators sized for maximum differential pressures specified in the design specifications.
Materials of Construction
Valve Body: Valve body shall be made of materials conforming to SA-216, Gr. WCB or SA-516, Gr. 70.
Valve Disc: Valve disc shall be made of material conforming to SA-216, Gr. WCB or SA-516, Gr. 70. The seating edge of the disc shall be stainless steel. For Pratt 1100 6" and 8" size valves, disc material shall be SA-479, Type 304 Stainless Steel.
Valve Shaft: Valve shaft shall be SA-564, Type 630 (Cond. 1150).
Valve Trim: The elastomeric components of valves, such as packing, seat and O-rings, shall be of material suitable for specified radioactive and temperature service. EPT materials for these components will be preferred.
Materials for Special Applications
For salt or brackish water service, or for borated water service, or for any other corrosive fluid services, the valve body shall be fully rubber-lined with rubber extending over the flange face. The disc shall be solid stainless steel conforming to SA-351, CF8M. Valve shaft material shall be Monel. Other suitable materials currently under consideration by Code will be considered for construction of valves in such services.
Fully machined valve bodies shall be hydrostatically tested in accordance with requirement of ASME Sec. III. Tight shut-off of the valve seat in both directions of travel will be demonstrated by testing with air or water in accordance with MSS-SP-67.
Fully assembled valves shall be cycled, opened and closed three times without pressure across the disc, to check proper functioning of the operators and proper setting of travel limit stops. Electric actuators shall be checked for conformance to speed of closure requirements, with a minimum specified motive power in the design specifications.