GB/T 9842-2018Specification for urea reactor (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 9842-2004 "Technical Conditions for Urea Synthesis Tower", compared with GB/T 9842-2004, except editorial modification The main technical changes are as follows.

--- Revised the design temperature limit (see Chapter 1, Chapter 1 of the 2004 edition);

--- Removed terms and definitions (see Chapter 3 of the 2004 edition);

--- Increased requirements for urea grade austenitic stainless steel (see 3.2.2.1);

---Modified the chemical composition of the welding material (see Table 2, Table 2 of the 2004 edition);

---Modified the requirements for ultrasonic testing of stainless steel seamless steel tubes with an outer diameter of more than 20 mm [see 3.2.3.2f), 2004 edition 4.2.3.2f)];

---Increased the manufacturing standard of the spherical head, removing the misplaced amount of the butt weld and the spherical head of the integral stamped spherical head The requirement of the difference between the inner diameter and the inner diameter of the connected barrel section (see 3.3.4.1);

--- Increased the overall multi-layer dressing of the barrel section in processing and forming (see 3.3.5.1);

---Modified the requirement for any single non-adhesive area of the lining [see 3.3.6.2a), 2004 version 4.3.6.2.1];

--- Revised the requirements for the qualification of welding tools (see 3.4.1, 4.4.1 of the 2004 version);

--- Increased requirements for heat treatment heating media to avoid direct injection weldments (see 3.5.6);

--- Removed the content of the leak test ammonia leak test [see 2004 edition of 5.3c)];

--- Increased the content of the leak test leak test [see 4.3c)];

--- Revised the requirements for stainless steel pickling, passivation and implementation standards (see 5.2, 6.2 of 2004 edition);

--- Revised the requirements for the protection of urea synthesis towers using seaborne (see 7.1, 7.1 of 2004 edition).

1 Scope

This standard specifies the requirements of urea synthesis tower in urea plant, hydraulic test and leakage test, pickling passivation of stainless steel, paint, package Equipment, transportation, signs and technical documents.

This standard is applicable to urea grade ultra-low carbon austenitic stainless steel with design pressure not more than 21.6MPa and design temperature not more than 200 °C. (hereinafter referred to as stainless steel) lining urea synthesis tower.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 150 (all parts) pressure vessel

GB/T 983 stainless steel electrode

GB/T 1220 stainless steel rod

GB/T 4226 stainless steel cold-worked steel rod

GB/T 5777-2008 Seamless steel tube ultrasonic flaw detection method

GB/T 13296 stainless steel seamless steel pipe for boilers and heat exchangers

GB/T 14976 stainless steel seamless pipe for fluid transportation

GB/T 25150 Standard Test Method for Austenitic Stainless Steel Passivation Films in Chemical Cleaning of Industrial Equipment - Blue Point Method

GB/T 25151.1 Inspection methods for the manufacture of high-pressure equipment for urea - Part 1. Ultrasonic testing of stainless steel strips

GB/T 25151.2 Determination of urea high-pressure equipment - Part 2: Selection of urea-grade ultra-low carbon chromium-nickel-molybdenum austenitic stainless steel Sex corrosion inspection and metallographic examination

GB/T 25151.3 Inspection methods for the manufacture of high-pressure equipment for urea - Part 3: Ultra-low-carbon chromium-nickel-molybdenum austenitic stainless steel Corrosion tendency test

GB/T 25151.4 Inspection methods for the manufacture of high-pressure equipment - Part 4. s. Sample preparation for corrosion tendency test

GB/T 25151.6 - Methods of test for the manufacture of high-pressure equipment - Part 6

GB/T 25198 pressure vessel head

HG/T 3179 Urea High Pressure Equipment Surfacing Process Assessment and Welder Skill Assessment

Welding procedure qualification and welder skill evaluation of HG/T 3180 urea high-pressure equipment lining plate and internal parts

JB/T 4711 Pressure Vessel Coating and Transport Packaging

NB/T 47013.1 Non-destructive testing of pressure equipment - Part 1: General requirements

NB/T 47013.2-2015 Non-destructive testing of pressure equipment - Part 2: Radiographic testing

NB/T 47013.5-2015 Non-destructive testing of pressure equipment - Part 5: Penetration testing

NB/T 47016 Mechanical properties test of welded test pieces for pressure equipment

3 Requirements