This document provides specific requirements for field installed sealing between a pressurized system (stream) containing flammable or combustible process fluids which is connected directly or indirectly to an electrical system where a failure could allow the migration of process fluids directly into the electrical system. The basic requirements for electrical safety are not specifically addressed by this standard. The effects of the loss of containment of the process system in terms of risk to… read more the environment and/or personnel health and safety are also not addressed by this document. read less

定价： 56元 / 折扣价： 48 元

In the "Protocol Specification for ANSI Type 2 Optical Port" Standard (ANSI C12.18/MC12.18/IEEE 1701), a point-to-point protocol was developed to transport table data over an optical connection. The ANSI C12.18 / MC12.18/IEEE 1701 protocol include an application language called Protocol Specification for Electric Metering (PSEM) that allows applications to read and write Tables. The "Protocol Specification for Telephone Modem Communication" (ANSI C12.21/MC12.18/IEEE 1702) was then developed to… read more allow devices to use PSEM to transport Tables over telephone modems. This standard extends the concepts of ANSI C12.18/MC12.18/IEEE 1701, ANSI C12.21/MC12.18/IEEE 1702, and ANSI C12.19/MC12.19/ IEEE 1377 standards to allow transport of Table data over any reliable networking communications system. Note that in this use of the word, "reliable" means that for every message sent, the sender receives a response at its option: either a positive acknowledgment or an error message. That is, messages cannot fail silently in a reliable network (see discussion of Reliable Stream Transport Service in IPPA [B1]).2 In addition, this standard describes an optionally exposed point-to-point interface between a C12.22 Device and a C12.22 Communications Module designed to attach to "any" network. The terms "C12.22 XXXX" (e.g., C12.22 Device) were introduced by ANSI C12.22-2008. These terms can be interchangeably replaced with the terms "IEEE 1703 XXXX"; i.e., the IEEE 1703 Device is the same as the ANSI C12.22 Device and the IEEE 1703 Communication Module is the same as the C12.22 thiCommunication Module. However, since this standard was originally developed under the auspice of ANSI C12 SC17 WG1, the document terminology is based on C12.22 terms. Furthermore,s standard defines a methodology to capture, translate, and transmit one-way device messages (blurts). read less

定价： 254元 / 折扣价： 216 元

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The base document ISO/IEC 12207, establishes a common framework for software life cycle processes, with well-defined terminology, that can be referenced by the software industry. It contains activities, and tasks that are to be applied during the acquisition of a system that contains software, a stand-alone software product, and software service and during the supply, development, operation, and maintenance of software products. Software includes software portion of firmware. The proposed standard will provide guidance for software reuse, software process management indicators, categories for problem reporting, guidance on software/system architecture, development strategies, tailoring and build planning, and software product evaluations, alternate means of compliance for joint reviews, configuration management and acquirer-supplier interaction.

定价： 172元 / 折扣价： 147 元

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定价： 97元

This standard applies to premium-efficiency totally enclosed fan-cooled (TEFC) and totally enclosed nonventilated (TENV), horizontal and vertical, single-speed, squirrel cage polyphase induction motors, 0.75 kW to 370 kW (1 hp to 500 hp), and up to 4000 V nominal, in National Electrical Manufacturers Association (NEMA) frame sizes 143T and larger, for petroleum, chemical, and other severe-duty applications (commonly referred to as premium-efficiency severe-duty motors). Excluded from the scope… read more of this standard are motors with sleeve bearings and additional specific features required for explosion-proof motors. read less

定价： 61元 / 折扣价： 52 元

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定价： 188元

This standard applies to IE3 (premium-efficiency) totally enclosed fan-cooled (TEFC) International Cooling IC411, totally enclosed air over (TEAO) IC418 and totally enclosed non-ventilated (TENV) IC410, horizontal and vertical, single-speed, squirrel cage polyphase induction motors, 0.75 kW to 370 kW (1 hp to 500 hp), and up to 4000 V, in International Electrotechnical Commission (IEC) frame sizes (80) and larger, for severe-duty applications seen in the Process Industry (commonly referred to… read more as IE3 (premium-efficiency) severe-duty motors). Excluded from the scope of this standard are motors with sleeve bearings, totally enclosed blower cooled (TEBC) IC416, and additional specific features required for flame proof motors. read less

定价： 65元 / 折扣价： 56 元

This standard applies to IE3 (premium-efficiency) totally enclosed fan-cooled (TEFC) International Cooling (IC)411, totally enclosed air over (TEAO) IC418 and totally enclosed non-ventilated (TENV) IC410, horizontal and vertical, single-speed, squirrel cage polyphase induction motors, 0.75 kW to 370 kW (1 hp to 500 hp), and up to 4000 V, in International Electrotechnical Commission (IEC) frame sizes (80) and larger, for severe-duty applications seen in the Process Industry (commonly referred to… read more as IE3 (premium-efficiency severe-duty motors). Excluded from the scope of this standard are motors with sleeve bearings, totally enclosed blower cooled (TEBC) IC416, and additional specific features required for flame proof motors. read less

定价： 64元