HG/T 3914-2006 English PDF (HGT3914-2006)

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HG/T 3914-2006: Rotary cylinder dryers with steam tube
HG/T 3914-2006
CHEMICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 71.120; 75.180.20
G 92
Filing No.: 18266-2006
Rotary cylinder dryers with steam tube
ISSUED ON: JULY 26, 2006
IMPLEMENTED ON: MARCH 01, 2007
Issued by: National Development and Reform Commission of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Classification and model ... 5 
4 Requirements ... 6 
5 Inspection and inspection rules ... 15 
6 Product marking, packaging, transportation, storage ... 16 
Rotary cylinder dryers with steam tube
1 Scope
This standard specifies the technical requirements, for the design, manufacture,
inspection, marking, packaging, transportation and storage of rotary cylinder dryers
with steam tube (hereinafter referred to as dryers), which has an inner diameter of 2000
mm ~ 4000 mm. When the inner diameter of the dryer exceeds the above range, it is for
reference only.
The dryers, which is described in this standard, are mainly suitable for drying high-
density polyethylene, polypropylene, polyvinyl chloride, terephthalic acid, corn alcohol
trough and other moisture-containing materials, in petrochemical and related industries.
It is also applicable to the drying of similar non-viscous moisture-containing materials,
in the form of powder, granular, flake, paste.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard; however, parties who
reach an agreement based on this Standard are encouraged to study if the latest versions
of these documents are applicable. For undated references, the latest edition of the
referenced document applies.
GB 150-1998 Steel pressure vessels
GB 151-1999 Tubular heat exchangers
GB/T 1184-1996 Geometrical tolerancing - Geometrical tolerance for features
without individual tolerance indications
GB/T 1804-2000 General tolerances - Tolerances for linear and angular dimensions
without individual tolerance indications
GB/T 3077-1999 Alloy structure steels
GB 3836.1-2000 Electrical apparatus for explosive gas atmospheres - Part 1:
General requirements
GB/T 6404.1 Acceptance code for gear units - Part 1: Test code for airborne sound
GB/T 7233 Methods for ultrasonic testing and for specifying quality levels of steel
castings
GB/T 8163-1999 Seamless steel tubes for liquid service
GB/T 9443 Methods of liquid penetrant testing and classification of indication for
steel castings
GB/T 10095.1-2001 Cylindrical gears - System of accuracy - Part 1: Definitions and
allowable values of deviations relevant to corresponding flanks of gear teeth
GB/T 10095.2-2001 Cylindrical gears-system of accuracy - Part 2: Definitions and
allowable values of deviations relevant to radial composite deviations and runout
information
GB 13296 Seamless stainless steel tubes for boiler and heat exchanger
GB/T 13306 Plates
JB 4708-2000 Welding procedure qualification for steel pressure vessels
JB/T 4709-2000 Welding specification for steel pressure vessels
JB/T 4711-2003 Coating and packing for pressure vessels transport
JB/T 4730.2-2005 Nondestructive testing of pressure equipments - Part 2:
Radiographic testing
JB/T 4730.3-2005 Nondestructive testing of pressure equipment - Part 3: Ultrasonic
testing
JB/T 4730.4-2005 Nondestructive testing of pressure equipments - Part 4: Magnetic
particle testing
JB/T 4730.5-2005 Nondestructive testing of pressure equipments - Part 5: Penetrant
testing
JB 4732-1995 Steel pressure vessel - Stress analysis design standard
JB/T 4735-1997 Steel welded atmospheric pressure vessels
JB/T 6397 Specification for the heavy carbon structural steel forgings
3 Classification and model
3.1 Classification
The dryer can be divided into 3 types, according to the discharge method: radial
discharge (J), gravity center discharge (Z), forced center discharge (Q).
running time of the whole machine reaches 20000 h.
4.2.5 Spherical roller bearings should be used for supporting roller and retaining roller
bearings; the design life shall not be less than 50000 h.
4.2.6 For the noise control of the unit (except the hammer), the noise at 1000 mm from
the transmission device and the screw feeder shall be lower than 85 dB(A), meanwhile
it shall comply with the provisions of GB/T 6404.
4.2.7 For the dryer, whose materials are inflammable and explosive, AND which is used
in the explosion-proof area, it shall consider the explosion-proof and flame-proof
measures and requirements of the motor, electrical appliances, accompanying
instruments, which comply with the provisions of GB 3836.1-2000.
4.3 Materials
4.3.1 In addition to complying with the provisions of the cited standards, the materials
used shall also comply with the requirements of the drawings.
4.3.2 The materials of pressure parts and transmission parts shall have quality certificate.
4.3.3 The inspection and re-inspection of materials shall not only meet the requirements
of the drawings, but also meet the requirements of the order contract.
4.3.4 When the heating tube is made of stainless steel tube, the heating tube shall
comply with the provisions of GB/T 13296. When the heating tube is made of carbon
steel tube, it shall comply with the provisions of GB/T 8163-1999.
4.3.5 Castings of medium carbon steel or low alloy steel should be used for the large
ring gear; the castings shall be normalized and tempered.
4.3.6 The large carbon structural steel forgings should be used for the rolling rings AND
comply with the provisions of JB/T 6397.
4.3.7 Forgings or castings of medium carbon steel and low alloy steel should be used
for supporting rollers and retaining rollers.
4.3.8 Alloy steel forgings should be used for pinion gear, supporting roller shaft,
retaining roller shaft, pinion shaft; their chemical composition and mechanical
properties shall comply with the provisions of GB/T 3077-1999.
4.3.9 The acceptance of purchased mechanical and electrical products shall not only
meet the requirements of national and industry standards, but also meet the
requirements of drawings.
4.4 Manufacturing
4.4.1 Requirements for component manufacturing
4.4.6.5 When the annular tube is used to discharge the non-condensable gas, the butt
weld of the annular tube shall be subjected to 100% radiographic inspection, which
shall be qualified, according to the level II requirement of JB/T 4730.2-2005.
4.4.7 Large gear ring
4.4.7.1 Before milling teeth, ultrasonic testing shall be carried out; it shall be qualified
according to the level 3 requirements of GB/T 7233.
4.4.7.2 The joint surface of the two halves of the gear ring shall be more than 4/5 of the
contact area.
4.4.7.3 The tooth profile processing shall meet the level 9 precision requirements of
GB/T 10095.1-2001 and GB/T 10095.2-2001. There shall be no pores, cracks, slag
inclusions and other defects, on the tooth profile surface; repair welding is not allowed.
4.4.7.4 The heat treatment hardness of the tooth surface shall meet the requirements of
the drawing.
4.4.7.5 Penetration testing shall be carried out on the tooth profile surface; it shall be
qualified, according to the level I requirements of GB/T 9443.
4.4.7.6 After the large gear ring is made, a circular indexing line shall be engraved on
its sid...