API的壹項重要任務，就是負責石油和天然氣工業用設備的標準化工作，以確保該工業界所用設備的安全、可靠和互換性。制定協調標準是API最早和最成功的項目之壹，自1924年發布第1個標準開始，API現在已發布了500個標準。API是ANSI認可的標準制定機構，其標準制定遵循ANSI的協調和制定程序準則，API還與ASTM聯合制定和出版標準，此外，API積極參加適合全球工業的ISO標準的制定工作，是ISO/TC 671SC9井口設備和管線閥門的秘書處。
API標準應用廣泛，不僅在國內被企業采用和被美國聯邦和州法律法規以及運輸部、國防部、職業安全與健康管理局、美國海關、環境保護署、美國地質勘查局等政府機構引用，而且也在世界範圍內被ISO、國際法制計量組織和100多個國家標準所引用。
API標準主要是規定設備性能，有時也包括設計和工藝規範，標準制定領域包括石油生產、煉油、測量、運輸、銷售、安全和防火、環境規程等，其信息技術標準包括石油和天然氣工業用EDI、通信和信息技術應用等方面。
API在美國國內以及在世界其他國家都享有很高的聲望，它是美國商業部和美國貿易委員會承認的石油機械認證機構。它所制定的石油化工和采油機械技術標準被許多國家采用，中東、南美和亞洲許多國家的石油公司在招標采購石油機械時，壹般都要求佩有API標誌的產品才能有資格參加投標。因此，擁有API標誌的石油機械設備不僅被認為是質量可靠而且具有先進水平。目前，在包括勘探和生產、運輸、精煉和市場營銷等各個方面擁有來自全世界的會員。今天，API已發展成為不僅在美國，而且越來越多地成為世界石油工業活動的有機組成部分。
引自美國石油學會2004年9月
API各項規範
引自美國石油學會2004年8月
由世紀通衡國際技術咨詢有限公司API認證項目工程師整理
API標誌及其使用權
API會標是美國石油學會的學會產品標誌，始於1924年，目的是為了鑒定生產的設備、材料，並提供能符合API質量體系和產品標準的生產企業。該標誌經美國註冊登記，未經許可任何人不得使用。
API取證即通過壹個申請、檢查、確認程序，有API向產品技術商符合API產品規範、質量保證體系（ISO9000）符合API質量綱要規範的制造廠授予證書，允許制造廠在其產品上使用API會標標誌。API取證的實質是商標轉讓使用的授權活動。
API對會標的說明
(1)只授予通過API認證的制造廠
(2)不是對制造廠的擔保
(3)不是對設計的贊同
(4)不是對產品的擔保
(5)制造廠保證經確認的產品，每壹個都符合制造時的API規範
(6)API承認制造廠在遵守制定的API標準方面受到了API的信任
引自美國石油學會2004年8月
由世紀通衡國際技術咨詢有限公司API認證項目工程師整理
API取證流程及文件準備
I. 企業尋找到符合自己要求的咨詢機構，需要首先完成以下表格及文件：
a.制造廠申請
b.API證書協議
c.取證信息表
咨詢機構明確企業的詳細需求之後，與API總部取得聯系，索取相應的標準並轉交申請
咨詢機構對企業進行培訓，內容包括：
d.API規範
e.文件編寫要求
II. 在咨詢機構的指導下，企業編寫文件化質量管理體系，包括：
f.質量手冊
g.管理程序文件
h.與質量管理相關聯的其它作業文件
咨詢機構負責所有文件的審核，並將《質量手冊》翻譯成英文版本
企業管理者批準、發布質量體系文件
企業在咨詢機構的協助下，對管理、技術及市場人員進行培訓
III. 由咨詢機構協助邀請API派評審員進行現場審核，現場審核的具體分為二步：
第壹步，API質量程序工作人員將按照API Q1規範的要求，以及企業申請的I產品規範。對企業的質量手冊進行格式審查。
第二步，在質量手冊獲得認可之後，API將在制造廠和API都方便時安排壹次現場審查，審查費由制造廠承擔。
API審核人員將根據評審期間，驗證API質量標準的各項符合性，所獲得的客觀依據來決定是否發證。
IV. 如現場審核過程中發現問題，企業應及時采取糾正措施，並提出預防方案。糾正措施和預防方案需要得到API審核員的再次審驗。
API在審核員簽字認可後，頒發有效期為三年的會標使用許可證書。
企業通過API認證可以鞏固、完善質量體系，提高產品質量。
在認證過程中，咨詢機構負責與API之間全部的聯系、催辦、監督、服務跟蹤及關系協調工作。
引自美國石油學會2004年8月
由世紀通衡國際技術咨詢有限公司API認證項目工程師整理
API取證費用
API取證過程中，需要向美國石油協會支付的申請費用如下：
第壹種產品（認證覆蓋的產品）申請費2950美元 第二種產品申請費1850美元 第三種產品以後申請費650美元 外加3%的銀行手續費 審核費為450-600美元/人*天；（壹般去1名審核員審核3天，企業規模大相應增加審核人*天數，該費用包含審核員往返食宿、差旅費。惹企業規模較大，申請證書較多，則需再延長1-2天） 根據慣例，企業的申請文件、《質量手冊》和申請費用，均不歸還。引自美國石油學會2004年8月
API中國取證企業名單
截至2004年9月1日，中國已有293家企業通過API規範認證，這些企業的名單如下：
1st Machinery Works of North China Petroleum
3H (Shanghai) Petroleum Equipment Co., Ltd.
ABB Vetco Gray Petroleum Equipment (Shanghai) Co., Ltd.
Anhui Tunxi High Pressure Valve Factory
Anshan Aotong Steel Pipe Plant
Anshan Dragon Pipe Industries Co., Ltd.
Baoji Oilfield Machinery Co., Ltd.
Baoji Petroleum Steel Pipe Co., Ltd.
Baoji Rigor Petroleum Machinery Co. Ltd.
Baoji-SMI Petroleum Steel Pipe Corporation
Baoyi Valve Group Co., Ltd.
Beijing Petroleum Machinery Factory
Beric-Davis Companies International, Ltd.
Beric-Davis Companies International, Ltd.
Bohai NKK Drill Pipe Co., Ltd.
Bohai Oil Engineering Company
Boteli Valve Group Co., Ltd.
Cangzhou OCTG Co., Ltd. of Huabei Oilfield
Cangzhou Xinyuantai Steel Pipe Mill Co., Ltd.
Changge Yulong Pipe Products Co., Ltd.
Changqing Petroleum Exploration Bureau Machinery Manufacture Plant
Changshu Jichang Petroleum Machinery Manufacturing Co., Ltd.
Chengde Kingdream Petroleum Machinery Co. Ltd.
Chengdu Best Diamond Bit Co. Ltd.
Chengdu Chengfeng Valve Co., Ltd.
Chengdu Chuankong Valve Co., Ltd.
Chengdu High Pressure Valve Plant
Chengdu Mechanical Works of Sichuan Petroleum Administration
China Gaoneng Valve Co., Ltd.
China KCM Valve Co., Ltd.
China Liangjing Group Co., Ltd
China Oilfield Services Limited
China Shiyuan Valve Manufacturing Co., Ltd.
China South Valve Group Manufacture Co., Ltd.
China Sungo Valves Co., Ltd.
China Tefulong Group Co., Ltd.
China Zhongquan Group Co., Ltd.
China-Jiangnan Valve Co., Ltd
Chiwan Sembawang Engineering Co. Ltd.
Chongqing Xin Tai Machinery Ltd.
Chuannan Machinery Manufacturing Plant
Chuanyou Guanghan Honghua Co. Ltd.
Da Feng Valve Plant
Dagang Oilfield Group New Century Machinery Manufacturing Co., Ltd.
Dalian DV Valve Co., Ltd.
Dalian Marine Valve Factory
Daqing Honggang Drilling Tool Factory
Daqing Petroleum Equipment Group
Daqing Rijiu Centralizer Plant
Deyang Huadi Petroleum Equipment Co., Ltd.
Drilling & Production Equipment Plant of Sichuan Petroleum Administration
Drilling Engineering Technology Research Institute of Daqing Petroleum Administration Bureau
Drilling Technology Research Institute, Shengli Petroleum Administrative Bureau, SINOPEC
Drilling Tool Sub-company of Daqing Drilling Technology Services Company
Enflow Industries Inc.
Fenghua City High-Middle Pressure Valves Manufacture Co., Ltd.
Fenghua Hengtong Valves Co. Ltd
Fujian Sanming High & Middle Pressure Valve Factory
Fushun Cement Co. Ltd.
Gaoyou Huaxing Petroleum Manufacturing Co., Ltd.
General Machinery Plant of Shengli Petroleum Administration
Gezhouba Holding Company Cement Plant
Great Valve Manufacturing Co., Ltd.
Guanghan Petroleum Well-Control Equipment Co., Ltd.
Guangzhou Panyu District Dongsu Machinery Co., Ltd.
GuiZhou GaoFeng Machinery Factory
Guizhou Wire Rope Incorporated Company
Hangzhou Donghua Chain General Factory
Hebei Cangzhou Hengtong Tubing Co. Ltd
Heibei Zhongyuan Steel Pipe Manufacture Co., Ltd.
Heilongjiang North Shuangjia Drilling Tools Co., Ltd.
Henan Gaoshan Valve Co., Ltd.
Henan Petroleum Exploration Bureau Machinery Plant
Henan Shangdie Valve Co., Ltd.
Henan Zhongyuan Special Steel Works
Henan Zyzj Petroleum Equipment Co., Ltd.
Hubei Fuxing Science and Technology Co., Ltd.
Hunan Hengyang Steel Tube (Group) Co. Ltd.
Inner Mongolia No. 1 Machinery (Group) Co., Ltd.
Integrated Equipment, Inc.
Jiang Yin Eastern Valve Company, Ltd.
Jianghan Petroleum Machinery Plant
Jiangsu Chang-Bao Steel Tube Limited Co.
Jiangsu Chengde Steel Tube Share Co. Ltd.
Jiangsu Huaneng Cable Co., Ltd.
Jiangsu Jin Shi Machinery Group Co., Ltd.
Jiangsu Rudong General Machinery Company Limited
Jiangsu Rushi Machinery Co. Ltd
Jiangsu Shuguang Drilling Tool Co., LTD.
Jiangsu Shuguang Grant Prideco Tubular Co., Ltd.
Jiangsu Suyan Valve & Pipe Plant
Jiangsu Xianzhong Petroleum Machinery Co., Ltd.
Jiangsu Xinxiang Share Co., Ltd.
Jiangsu Yulong Steel Pipe Co., Ltd.
Jiangyin Chuangxin Oil Pipe Company Ltd.
Jiangyin Xingcheng Special Steel Works Co., Ltd.
Jianhu County Hongda Valve & Pipe Co., Ltd.
Jingbo Petroleum Machinery Plant
Jinxi Steel Pipe Co. Ltd of Lingyuan Iron and Steel Group
Jiyuan Petroleum Machinery Co., Ltd
Ju Long Steel Pipe Co. Ltd.
JUN Valve (Kunshan) Co., Ltd.
KF Industries, Inc.
Kingdom Precision Casting Co., Ltd.
KingDream Public Limited Company
KingDream Public Ltd Company Shanghai Branch
KTM Ball Valve Manufacturing (Sichuan) Co., Ltd.
Kunshan AB Valve Co. Ltd.
Kunshan Valve Co., Ltd.
Lanzhou General Machinery Plant
Lanzhou High Pressure Valve Limited Company
Lanzhou LS-National Oilwell Petroleum Engineering Company Limited
Lanzhou Petroleum & Chemical Machinery Works
Lianyungang Ocean Liquid Loading & Unloading Machine Co., Ltd.
Liaohe Oilfield General Machine Factory
Liaoning Dongyu Oil Pipe Manufacturing Co., Ltd.
Liaoning Jinxi (ASP) Steel Pipe Co. Ltd.
Liaoyang Spiral and Straight Seam Steel Tube Factory
Liaoyang Steel Tube Co., Ltd.
Liaoyang Xingde Large Steel Pipe Plant
Machinery Factory of Jilin Petroleum Group Co., Ltd.
Machinery Factory of Tuha Petroleum Exploration and Development Corporation
Machinery Factory of Tuha Petroleum Exploration and Development Corporation
MSP/Drilex
Mudanjiang City Oriental Diamond Bits Co., Ltd.
Mudanjiang Construction Material Petroleum Machinery Plant
Mudanjiang Petroleum Machinery Co., Ltd.
Mudanjiang Petroleum Tools Co., Ltd.
Mudanjiang Zhongyuan Drilling Co., Ltd.
Nanjing Luzhou Machine Works
Nantong Colves Fluid Control Co., Ltd.
Nantong High & Medium Pressure Valve Factory
Nantong Wire Rope (Group) Co., Ltd.
Nanyang Petroleum Machine Plant
Neway Valve (Suzhou) Co., Ltd.
Ningbo Mayer Steel Pipe Ltd.
Ningbo Sanding Steel Pipe Engineering Co., Ltd.
Ningxia Hengli Steel Wire Rope Co., Ltd.
Norms Engineering Co., Ltd.
North China Petroleum Steel Pipe Co. Ltd.
Northern Steel Pipe Co., Ltd.
Offshore Oil Engineering Co., Ltd.
Oil Well Cement Development Company, Zibo Zhongchang Special Cement Co, Ltd
Outong Group Co., Ltd. (Zhejiang Petrochemistry Valve Co., Ltd.)
P.T. Kvaerner Oilfield Products
Pangang Group Beihai Steel Pipe Corporation
Pangang Group Chengdu Iron & Steel Co., Ltd.
Panyu Chukong Steel Pipe Co., Ltd.
Power Machinery Works of Shengli Petroleum Administration
Precision Pipe Manufacturing Branch of Liaoning Tianyi Industry Co. Ltd.
Puyang City Shuangfa Industry Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Rongsheng Machinery Manufacture Ltd of Huabei Oilfield, Hebei
Sanmenxia Xinghe Petroleum Equipment Manufacture Co., Ltd.
Seamless Pipe Plant of Angang New Iron & Steel Co., Ltd., Angang Group Co.
Seamless Tube Mill of Baotou Steel Union Co., Ltd.
Shandong Huayin Special Cement Co. Ltd.
Shandong Longkou Special Rubber Hose Co., Ltd.
Shandong Molong Petroleum Machinery Co., Ltd.
Shanghai KVC Valve Co., Ltd.
Shanghai (Jinji Group) Jinji Valve Piping Mfg. Co., Ltd.
Shanghai Alison Steel Pipe Co., Ltd.
Shanghai Dalong Chains Works
Shanghai Fudi Valve Co., Ltd.
Shanghai Gaoneng High Pressure Valve Factory
Shanghai Huatong Valve Co., Ltd.
Shanghai Jinlun Mechanical Industry Co., Ltd.
Shanghai Kai-gong Valve Co., Ltd.
Shanghai Koko Valve Co., Ltd.
Shanghai Liang Gong Valve Factory
Shanghai Lixing Valve Manufacture Factory
Shanghai Meilong Valve Co.
Shanghai Neles-Jamesbury Valve Co., Ltd.
Shanghai Pudong Hanwei Valve Co., Ltd. (Shanghai Hanwei Special Valve Manufacturing Co., Ltd.)
Shanghai Shen Kai Petroleum & Chemical Equipment Co., Ltd.
Shanghai Source Mechanical & Electrical Equipment Co. Ltd.
Shanghai Third Navigation ASP Steel Pipe Co, Ltd.
Shanghai Valve Factory
Shanghai Zhongye Steel Pipe Co., Ltd.
Shanxi Fenglei Machinery Manufacturing Co. Ltd
Shanxi Norin Petroleum Machinery Co. Ltd.
Shashi Steel Pipe Works
Shashi Steel Pipe Works Fiberglass Reinforced Plastic Plant
Shengli Steel Pipe Co. Ltd.
Shengli-Highland Co., Ltd.
Shenjiang Valve Co., Ltd.
Shenyang Shengshi High and Medium Pressure Valve Co., Ltd.
Shenzhen Weisheng I.T.S. Petroleum Tubular & Equipment Co., Ltd.
Shijiazhuang Jiahua Special Cement Co., Ltd.
Si Chuan Huijian Petrochemical Equipment Co., Ltd.
Sichuan Chuanshi Chrida Diamond Bit Co., Ltd.
Sichuan Chuanshi Diamond Bit Co., Ltd.
Sichuan Huagong Petroleum Steel Pipe Co., Ltd.
Sichuan Jiahua Enterprise (Group) Co. Ltd.
Sichuan Kaitz Valve Mfg. Co., Ltd.
Sichuan Keycon Valve Manufacturing Co., Ltd.
Sichuan Petroleum Coring Center
Sichuan Petroleum Perforating Materials Ltd.
Sino-American Shanghai Pacific Pipe Co., Ltd.
Sinopec National Star Corporation Dezhou Petroleum Machinery Factory
Siping Wantong Steel - Pipe Company Limited
SJ Petroleum Machinery Co.
South China Marine Machinery Plant
Sow Long (Valve & Fitting) Co., Ltd. (Long Cheng Valves Co., Ltd.)
Special Vehicle Repairing and Manufacturing Plant
Steel Pipe Factory of Pipeline Bureau, CNPC
Steel Rope Factory of AnGang Group Co., Ltd.
Steel Tube Factory of China Third Metallurgical Construction Corp.
Steel Tube Subcompany Bao Shan Iron & Steel Co., Ltd.
Suzhou High & Medium Pressure Valve Factory
Suzhou KF Valve Co., Ltd.
Suzhou Valve Factory
Taixing Petroleum Machinery Co., Ltd.
Tekval Flow Control (Suzhou) Co., Ltd.
The Drilling Pipe & Tools Service Company of Shengli Oilfield
The Thermal Recovery Equipment Manufactory of Shengli General Engineering…
Tianjin Grant TPCO Drilling Tools Co., Ltd.
Tianjin Huafu Oilfield Chemicals Co., Ltd.
Tianjin Lida Steel Tube Plant
Tianjin Lilin Mechanical Group Co. Ltd.
Tianjin Pipe Company Ltd.
Tianjin Seamless Steel Pipe Plant
Tianjin Shengkai Industrial Technology Development Co., Ltd.
Tianjin Shenzhoutong Steel Pipe Co., Ltd
Tianjin Shuangjie Steel Pipe Co., Ltd.
Tianjin Tubular Goods Machining Co. Ltd.
Tieling Machinery & Equipment Manufacturing Co., Ltd of CNPC
Tonghua City DN Petroleum Machine Co., Ltd.
Tonghua Petroleum & Chemical Machinery Works Ltd.
Tonghua Petroleum Tools Co. Ltd.
TSC (Qingdao) Manufacturing Co., Ltd.
United Offshore Construction Company, CONHW
Universal Wire Rope Co., Ltd.
Wan Chi Steel Pipe (Qinhuangdao) Co., Ltd.
Wenzhou Huanqiu Valve Manufacturing Co., Ltd.
Wenzhou Tingyu Group Co., Ltd.
Wuhan Boiler Group Valve Co., Ltd. (Wuhan Advanced Flow Control & Engineering Ltd.)
Wuxi Erquan Special Steel Tube Co., Ltd.
Wuxi Huaying Valve Manufacturing Co., Ltd.
Wuxi Seamless Oil Pipe Co., Ltd.
Wuxi Seamless Steel Tube Co. Ltd.
Wuxi Universal Steel Rope Co., Ltd.
Wuxi Xishan Valve Plant
Xi'an Pump-Valve Clique Works
Xian Yang Petroleum Steel Tube & Wire Rope Co. Ltd
Xinjiang Petro Administration Bureau Machinery Manufacture General Company
Xinjiang Qingsong Cement Co., Ltd.
Xinjiang Tianshan Cement Co. Ltd.
Xinjiang Tunhe Cement Co., Ltd.
Xuzhou Guanghuan Steel Tube Co. Ltd.
Xuzhou Pipeline Tech Co. of SPSTC
Yancheng City Shuangxin Petroleum Machinery Plant
Yancheng City Xinde Petroleum Machinery Plant
Yancheng City Yancheng Power Station Valve Factory
Yancheng High & Medium Pressure Valve Factory
Yancheng Jiulong Valve Manufacture Co. Ltd.
Yancheng Sanyi Petrochemical Machinery Co., Ltd.
Yancheng Teda Petroleum Machinery Company Ltd.
Yancheng Tongshang Valve Co., Ltd.
Yancheng Yangbiao Petroleum Machinery Plant
Yangzhou Shuangliang Valve Manufacturing Co., Ltd.
Yangzhou Steel Pipe Works
Yantai Lubao Steel Tube Duty Co., Ltd.
Yichun Feilong Rock Bits Manufacture Co., Ltd.
Yongjia County Oubei Ball Valve Factory
Yumen Petroleum Administrative Bureau Machine Plant
Zhangjiakou Exploration Machinery General Factory
Zhe Jiang High & Medium Pressure Valve Plant
Zhe Jiang Wu Zhou Valve Co., Ltd.
Zhejiang Chaoda Valve Co., Ltd.
Zhejiang Fangyuan Valve Manufacturing Co., Ltd.
Zhejiang Fangzheng Valve Factory
Zhejiang Guoda Valve Co., Ltd.
Zhejiang Huadong Valve Co., Ltd. (Haigong Valve Factory of Zhejiang)
Zhejiang Huatai Valve Manufacturing Co., Ltd.
Zhejiang Jiehua Valve Co., Ltd.
Zhejiang Kingland Group Pipe Industry Co., Ltd.
Zhejiang KVT Valve Manufacturing Co., Ltd.
Zhejiang Shangyu Valve Manufacture Co., Ltd.
Zhejiang Weidouli Valves Manufacturing Co., Ltd.
Zhejiang Xinda Electric Power Steel Tube Co., Ltd.
Zhejiang Xinhai Valve Manufacture Co., Ltd.
Zhejiang Xulong Machinery Industry Co., Ltd.
Zhejiang Zhenghua Valve Factory
Zhengmao Group Co., Ltd.
Zhengzhou City Butterfly Valve Factory
Zhongcheng Machinery Manufacture Co., Ltd. of Dagang Oilfield Group
Zhongnan Equipment Company Ltd. (The State-Owned 388th Factory)
Zhongshan Walchamp Steel Pipe Co., Ltd.
Zhongyuan Drill & Production Equipment Plant of Zhongyuan P.E. Bureau
Zibo Hongyang Petroleum Equipment Co., Ltd.
Zigong High Pressure Valve Co., Ltd.
Ziyang Steel Pipe Plant
引自美國石油學會2004年9月1日