查看内容。本技术报告提供了估算因去除液体脚跟（独立储存液）和清洁地面储罐底部与残渣和水（污泥）混合的剩余储存液沉积物而产生的排放量的指南。本报告中涉及的排放物是指在储罐清洗过程中离开储罐的排放物。本报告未涉及:蒸汽离开储罐后的去向（除考虑控制装置的效率外）、污泥离开储罐后的去向（或污泥处理或处置过程中可能发生的排放）、或真空卡车真空泵或吸入泵可能排出的排放，如果此类装置用于储罐清洁过程。 换言之，本报告介绍了储罐清洗过程中以蒸汽形式离开储罐的挥发性有机化合物的质量估计。它不涉及从储罐中移除液体或污泥后处理这些物质可能产生的排放。 储罐清洗是一项非常规事件，目前没有排放因子。虽然给定的储罐只能每10到20年清洗一次，但法规可能要求在发生这种情况时报告由此产生的排放量。此外，石油工业设施可能需要估算其厂址内所有来源的排放量。为了满足这些报告排放量的要求，需要就如何估算排放量提供指导。 已经为大多数石油相关设施的常规排放源制定了排放系数，但对于估算非常规排放源的排放量，几乎没有可用的指导。当发生非常规事件时，公司通常会花费大量精力，对由此产生的排放量进行真诚的估计。然而，在缺乏任何行业实践或指导的情况下，这些估计值可能会有很大差异。本报告旨在减少对储罐清洁排放进行善意估算所需的工作量，并使所得排放估算更加一致。

View contents.This Technical Report provides guidance for estimating emissions that result from removing the liquid heel (free-standing stock liquid) and cleaning the remaining deposits of stock liquid mixed with residue and water (sludge) from the bottoms of aboveground storage tanks.The emissions addressed in this report are those that leave the tank during the tank cleaning process. This report does not address:the fate of vapors after they have left the tank (other than accounting for the efficiency of a control device),the fate of sludge after it has left the tank (or emissions that may occur during sludge treatment or disposal), oremissions that may be expelled by the vacuum pump of a vacuum truck or suction pump, if such devices are used in the tank cleaning process.In other words, this report addresses the estimation of the mass of volatile organic compounds that leave the tank as vapor during the tank cleaning process. It does not address emissions that may result from the handling of liquids or sludge after such materials have been removed from the tank. Tank cleaning is a non-routine event for which there are presently no emission factors. While a given tank may be cleaned only once every 10 to 20 years, regulations may require reporting the resulting emissions when this does occur. Furthermore, petroleum industry facilities may be required to estimate emissions from all sources within their plant sites. Gven these requirements to report emissions, there is a need for guidance on how to estimate them.Emission factors have been developed for most of the routine sources of emissions from petroleum-related facilities, but little guidance has been available for estimating emissions from non-routine sources. When non-routine events occur, companies often expend a significant effort in preparing a good faith estimate of the resulting emissions. In the absence of any industry-wide practice or guidance, however, these estimates may vary widely.This report is intended to reduce the effort required to generate a good faith estimate of tank cleaning emissions, and to result in more uniformity in the resulting emission estimates.