1、Owner/Operators Guide to Operation and Maintenance of Vapor Recovery Systems at Gasoline Dispensing FacilitiesAPI RECOMMENDED PRACTICE 1639FIRST EDITION, JULY 2003REAFFIRMED, MAY 2012Owner/Operators Guide to Operation and Maintenance of Vapor Recovery Systems at Gasoline Dispensing FacilitiesDownstr
2、eam SegmentAPI RECOMMENDED PRACTICE 1639FIRST EDITION, JULY 2003REAFFIRMED, MAY 2012SPECIAL NOTESAPI publications necessarily address problems of a general nature. With respect to partic-ular circumstances, local, state, and federal laws and regulations should be reviewed.API is not undertaking to m
3、eet the duties of employers, manufacturers, or suppliers towarn and properly train and equip their employees, and others exposed, concerning healthand safety risks and precautions, nor undertaking their obligations under local, state, or fed-eral laws.Information concerning safety and health risks a
4、nd proper precautions with respect to par-ticular materials and conditions should be obtained from the employer, the manufacturer orsupplier of that material, or the material safety data sheet.Nothing contained in any API publication is to be construed as granting any right, byimplication or otherwi
5、se, for the manufacture, sale, or use of any method, apparatus, or prod-uct covered by letters patent. Neither should anything contained in the publication be con-strued as insuring anyone against liability for infringement of letters patent.Generally, API standards are reviewed and revised, reaffir
6、med, or withdrawn at least everyfive years. Sometimes a one-time extension of up to two years will be added to this reviewcycle. This publication will no longer be in effect five years after its publication date as anoperative API standard or, where an extension has been granted, upon republication.
7、 Statusof the publication can be ascertained from the API Downstream Segment telephone (202)682-8000. A catalog of API publications and materials is published annually and updatedquarterly by API, 1220 L Street, N.W., Washington, D.C. 20005.This document was produced under API standardization proced
8、ures that ensure appropri-ate notification and participation in the developmental process and is designated as an APIstandard. Questions concerning the interpretation of the content of this standard or com-ments and questions concerning the procedures under which this standard was developedshould be
9、 directed in writing to the standardization manager, American Petroleum Institute,1220 L Street, N.W., Washington, D.C. 20005. Requests for permission to reproduce ortranslate all or any part of the material published herein should also be addressed to the gen-eral manager.API standards are publishe
10、d to facilitate the broad availability of proven, sound engineer-ing and operating practices. These standards are not intended to obviate the need for apply-ing sound engineering judgment regarding when and where these standards should beutilized. The formulation and publication of API standards is
11、not intended in any way toinhibit anyone from using any other practices.Any manufacturer marking equipment or materials in conformance with the markingrequirements of an API standard is solely responsible for complying with all the applicablerequirements of that standard. API does not represent, war
12、rant, or guarantee that such prod-ucts do in fact conform to the applicable API standard.All rights reserved. No part of this work may be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permis
13、sion from the publisher. Contact the Publisher, API Publishing Services, 1220 L Street, N.W., Washington, D.C. 20005.Copyright 2003 American Petroleum InstituteFOREWORDThis recommended practice provides guidance for owners and operators of gasoline dis-pensing facilities and regulatory officials reg
14、arding the operation and maintenance of gaso-line vapor recovery systems and components. Proper operation and maintenance of vaporrecovery equipment can improve compliance with vapor recovery regulations and providesubstantial emission reductions.In preparing this recommended practice, careful consi
15、deration was given to the following:a. Promoting safety.b. Protecting human health and the environment.c. Preventing release of vapors from service stations.d. Detecting petroleum vapor releases.e. Minimizing the cost of effective maintenance.Every effort has been made to ensure the consistency of t
16、he recommendations with theapplicable sections of NFPA 30 Flammable Liquid Codeand NFPA 30A Code for MotorFuel Dispensing Facilities and Repair Garages. In addition, consideration was given tolocal, state and federal laws and regulations.API publications may be used by anyone desiring to do so. Ever
17、y effort has been made bythe Institute to assure the accuracy and reliability of the data contained in them; however, theInstitute makes no representation, warranty, or guarantee in connection with this publicationand hereby expressly disclaims any liability or responsibility for loss or damage resu
18、ltingfrom its use or for the violation of any federal, state, local, or municipal regulation withwhich this publication may conflict.Suggested revisions are invited and should be submitted to the standardization manager,American Petroleum Institute, 1220 L Street, N.W., Washington, D.C. 20005.iiiCON
19、TENTSPage1 PURPOSE AND SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 DEFINITIONS AND ACRONYMS . . . . . . . . . . .
20、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 VAPOR RECOVERY REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.1 Vapor Recovery Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 EQUIPMENT INSPECTIONS . .
21、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2 Stage I Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22、 . . . . . . . . . . . . . . . . . 45.3 Stage II Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65.4 Inspection Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136 RECORD-KEEPING AND PER
23、MITTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136.2 Record Retention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24、. . . . . . . . . . . 136.3 Recommended Records Retention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 STATE VAPOR RECOVERY REQUIREMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . 14APPENDIX A INSPECTION CHECKLISTS . . . . . . . . . . . . . . . . . . . . . . .
25、. . . . . . . . . . 15APPENDIX B DEFINITIONS AND ACRONYMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Figures1 Stage I Vapor Recovery Two-Point (Dual) System . . . . . . . . . . . . . . . . . . . . . . . . . 12 Stage I Vapor Recovery Coaxial System . . . . . . . . . . . . . . . . . . .
26、 . . . . . . . . . . . . . . 23 Stage II Vapor Recovery System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Tank Fill Cap and Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Fill Adapter . . . . . . . . . . . . .
27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46Typical Detail of Fill Pipe with Overfill Prevention Valve and Drop Tube(Dual System) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57A Coaxial Drop
28、Tube and Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57B Gasket Between Adapter and Drop Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Dry Break Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29、. . . . . . . . . . . . . 59A Pressure/Vacuum Valve (Example 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69B Pressure/Vacuum Valve (Example 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610 Typical Detail: Hanging Hardware . . . . . . . . .
30、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 711B Nozzle Swivel (Configuration 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 811A Nozzle Swivel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31、 812 Vapor Assist Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 813 Typical Detail: Balance Nozzle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 914 Typical Detail: Vacuum Assist Nozzle with Mini-boot . . .
32、 . . . . . . . . . . . . . . . . . . 1015 Balance Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1116A Vapor Assist Nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1116B Vapor Assis
33、t Nozzle with Mini-Boot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1117 Breakaway Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1218 Balance System with Non-venturi Hose. . . . . . . . . . . . . . . . . . . . .
34、. . . . . . . . . . . . 13v1Owner/Operators Guide to Operation and Maintenance of Vapor Recovery Systems at Gasoline Dispensing Facilities1 Purpose and ScopeThis Recommended Practice (RP) is designed to provideguidance to owners and operators of gasoline dispensingfacilities (GDF) to effectively ope
35、rate and maintain Stage Iand Stage II vapor recovery systems. This guide does notaddress the maintenance required by qualified service techni-cians to perform periodic testing and major system repairs.Federal and/or State regulatory agency certified or approvedvapor recovery systems/equipment must b
36、e used to maintainthe efficiency of the vapor recovery system. The appropriatestate and/or locality should be contacted individually for site-specific requirements.This RP recommends the need for periodic inspections ofStage I and Stage II equipment. The equipment and the crite-ria for inspection ar
37、e identified in highlighted text with a cor-responding letter that indicates the frequency of theinspection. That is, a (D) represents a recommendation for adaily inspection; (W) recommends a weekly inspection; (M)recommends a monthly inspection; and (A) recommends anannual inspection. Appendix A is
38、 a suggested inspectionchecklist for the equipment and criteria identified in the text. 2 References API RP 1007Loading and Unloading of MC 306/DOT406 Cargo Tank Motor VehiclesNFPA130 Flammable Liquid Code 30ACode for Motor Fuel Dispensing Facilitiesand Repair Garages3 Definitions and AcronymsAppend
39、ix B lists definitions and acronyms that may behelpful in understanding vapor recovery systems.4Vapor Recovery Requirements4.1 VAPOR RECOVERY SYSTEMS4.1.1Stage I vapor recovery involves the return of vaporsstored in the underground storage tank (UST) back to the tanktruck during product delivery. Va
40、pors in the underground tankheadspace, i.e., the area in the tank above the liquid level, aredisplaced by the gasoline entering the tank during delivery.Headspace is also known as ullage. A flexible hose, providedby the transport company, connects the storage tanks providinga path for the vapors to
41、return to the truck. Vapors in the truckare then returned to the distribution terminal for processing.Stage I vapor recovery is required by state and local regula-tions in most of the United States. Stage II vapor recovery isrequired in certain air quality nonattainment areas by federalregulations,
42、and is administered by the states. Stage II regula-tions include some requirements for Stage I equipment.1National Fire Protection Association, 1 Batterymarch Park, Quincy,Massachusetts 02269.Figure 1Stage I Vapor Recovery Two-Point (Dual) SystemLiquid outVapor riserLiquid inVapor inVapor outVaporou
43、tLiquid inOverfillpreventionTightfillSubmersible pumpP/V ValveHeadspace (also called ullage)2 API RECOMMENDEDPRACTICE1639There are two types of Stage I systems: a two-point (dual)system, which uses separate product and vapor connectionson the underground tank; and a coaxial system, which uses asingl
44、e connection fitting to the underground tank. 4.1.1.1 Two-point (Dual) SystemThe delivery of product and recovery of vapors in a Stage Itwo-point system occurs through separate connections (seeFigure 1). The product is delivered (dropped) by gravitythrough a full connection and the vapors are return
45、ed througha separate vapor connection. The fill connection is fastened toa submerged fill tube that must have its discharge openingentirely submerged when the liquid level is 12 inches abovethe bottom of the storage tank. (Local requirements mayrequire the installation to be no higher than 6 inches.
46、) Thevapors are recovered through the second opening in the top ofthe storage tank and transferred to the tank truck through thevapor hose. 4.1.1.2 Coaxial SystemThe delivery of product and recovery of vapors in a Stage Icoaxial system occur through a single coaxial submerged filltube, which is simp
47、ly a tube inside a tube (see Figure 2). Theproduct is delivered through the inner tube and the vapors arerecovered through the annular space between the walls of theinner and outer tubes. As with the dual system, the innerproduct tube must be entirely submerged when the liquidlevel in the tank is 12
48、 inches or more while the outer vaportube is in the top of the tank. (Local requirements may allowthe installation to be no higher than 6 inches.)The coaxial submerged fill tube may be either fixed inposition or spring-loaded (moveable) with a vapor seal simi-lar to the dry break adapter seal in the
49、 dual system. Unlike thefixed version, the spring-loaded version has a flange aroundthe edge of the inner tube. A gasket is seated on the top sur-face of the flange. In this position, the gasket makes contactwith the inner surface of the adapter at the top of the sub-merged fill tube, thereby holding the entire assembly in placeand creating a vapor seal. All current California Air Resources Board (CARB) Exec-utive Orders certifying vacuum assist vapor recovery systemsprohibit the use of coaxial Stage I systems for stations con-structed after 1993. Many states refer to CARB ExecutiveOrd
