ACI 351.3R-18 勘误 May 14, 2025

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ACI 351.3R-18

Report on Foundations for Dynamic Equipment

Reported by ACI Committee 351

ERRATA as of May 14, 2025

p. 12, Section 4.3.1.2, revised as:

4.3.1.2 Machine unbalance load (meeting industry criteria)—Many rotating machines are balanced

to an initial balance quality either in accordance with the manufacturer’s procedures or as specified by the

purchaser. ISO 1940-1 and ASA/ANSI S2.19 define balance quality in terms of a constant emo. For

example, the normal balance quality Q for parts of process-plant machinery is 0.25 in./second (6.3

mm/second). Typical balance quality grade examples are shown in Table 4.3.1.2. To meet these criteria a

rotor intended for faster speeds should be better balanced than one operating at a slower speed. Using this

approach, Eq. (4.3.1.1) can be rewritten as:

Fo = mrQoSf lbf (4.3.1.2a)

Fo = mrQoSf /1000 N

where units of Q are in in./s in the inch-pound system and mm/s in the SI systemwhere Q is in inch-pound

and SI systems is ft/second and mm/second respectively.

ERRATA as of September 6, 2022

p. 37, Table 5.8.1b revised as:

Table 5.8.1b—Values of α1, βj, and γj

ν = 0

ν = 0.33

ν = 0.45

ν = 0.50

α1

0.775

0.650

0.600

β1

0.525

0.500

0.450

0.400

β2

0.800

β3

0.000

0.023

0.027

γ1

0.850 0.250

0.750 0.350

—

0.850 0.00

γ2

1.000

0.800

—

0.000

γ3

0.000

—

0.170

γ4

0.850

0.750

—

0.850

ERRATA as of June 17, 2021

p. 29, Eq. (5.5.1e), revise as:

uj u

p. 49, Eq. (6.5a), revise as:

ωn =

/MK

ωn =

/KM

ERRATA as of September 28, 2020

Note: This is a clarification to Eq. (4.3.1.1) in inch-pound system. Use W/g for the mass, where W is the

weight in pounds (force), and g is gravity, 386.1 in./s2. That is lbm = lbf/g = lbf/386.1 in./s2.

-----------------------------------------------------------------------------------------------------------------------------

Note: This is a clarification to Eq. (4.3.1.2a) in inch-pound system. Use W/g for the mass, where W is

the weight in pounds (force), and g is gravity, 386.1 in./s2. That is lbm = lbf/g = lbf/386.1 in./s2.

ERRATA as of September 12, 2019

p. 33, Fig. 5.5.2.2a, figure revised as:

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摘要：

本页面提供了 ACI 351.3R-18 勘误的最新更新内容，发布日期为 2025 年 5 月 14 日。该勘误针对《用于设备和机械安装的水泥基灌浆材料报告》中的技术细节和文本错误进行了关键修正，涵盖材料性能数据、施工建议及安装规范引用等核心部分。用户可直接获取此次勘误的完整内容，确保工程设计与施工依据符合最新标准要求，避免因版本旧而导致的合规风险。本次勘误适用于结构工程师、灌浆材料供应商、设备安装承包商及项目质量管理人员，是准确执行 ACI 351.3R-18 标准不可或缺的配套参考文件。

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