HG/T 2129.8-1991 Manholes for chemical equipment parts made of acid-resistant phenolic plastics HG/T2129.8-1991 Standard download decompression password: www.bzxz.net

Scope of application
Chemical Industry Standard of the People's Republic of China
Manholes made of acid-resistant phenolic plastic for chemical equipment parts
HG/T2129.891
This standard applies to manholes made of acid-resistant phenolic plastic with an allowable temperature of -30℃~130℃ and an allowable pressure less than or equal to 0.15MPa.
2 Reference standards
GB1804 Tolerances and fits Limit deviations of dimensions without tolerances HG/T2128 Technical conditions for chemical equipment, pipes and fittings made of acid-resistant phenolic plastic HG/T2129.29 Loose flanges for chemical equipment parts made of acid-resistant phenolic plastic 3
Types and basic dimensions
Types and basic dimensions are as specified in the following figure and Tables 1 and 2. Approved by the Ministry of Chemical Industry of the People's Republic of China on August 19, 1991 and implemented on January 1, 1992
HG / T 2129.8 91
Nominal diameter DN
Loop ring
Split ring
Manhole cover
HG/T2129.8—91
Parts list
See basic size table
See basic size table
Basic size table
Acid-resistant phenolic plastic
Acid-resistant phenolic plastic
HG/T2129.29
HG/T2129.29
Soft gasket
①The height H of the manhole can be changed as needed. However, the changed size of H should be indicated, and the quality of the manhole should be changed. ②The bolt length is determined based on the gasket purity of 5mm. 4. The quality inspection, packaging, storage and transportation of raw materials and products shall comply with the provisions of HG/T2128. The manhole pressure test is carried out together with the equipment.
The manhole cover shall not have defects that reduce the strength and connection reliability. The center circle diameter of the bolt hole of the manhole cover and the chord length of two adjacent bolt holes are allowed to deviate by ±0.6mm; the deviation of the chord length between any two bolt holes is ±1.0mm. 5. The non-matching dimension tolerance grade of metal parts is in accordance with GB1804IT14 for machined surfaces and IT16 for non-machined surfaces. The technical requirements for loose rings and split rings are in accordance with the relevant provisions of HG/T2129.29.
Marking example
The marking symbol for manhole with nominal diameter DV=500mm is: manhole DV500HG/T2129.8-91wwW.bzxz.Net
The marking symbol for manhole with nominal diameter DN=500mm, H,=350mm (non-standard size) is: manhole DN500×350HG/T2129.8--9118
Additional instructions:
HG/T2129.8—91
This standard is proposed by China National Chemical Equipment Corporation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Non-metallic Chemical Equipment. This standard was drafted by Chengdu Chemical Research and Design Institute. The main drafters of this standard are He Jiabing and He Jin.
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