Standard No.:	NB/T 47017-2011
English Name:	Sightglass for pressure vessels
Chinese Name:	压力容器视镜
Professional Classification:	NB    Professional Standard - Energy
Issued by:	NEA
Issued on:	2011-7-1
Implemented on:	2011-10-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	10000 words
Price(USD):	300.00
Delivery:	via email in 1 business day

Sight glass for pressure vessels



1 Scope



This standard specifies the types, basic parameters and technical conditions of sight glass for pressure vessels.



This standard is applicable to sight glass for pressure vessels with nominal pressure not greater than 2.5 MPa, nominal diameter of 50 mm~200 mm, maximum allowable medium temperature of 250 °C and maximum sudden temperature difference of 230 °C.



2 Normative references



The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.



GB 150 Pressure vessels

GB/T 897-1988 Double end studs—bm=1d

GB/T 1804-2000 General tolerances—Tolerances for linear and angular dimensions without individual tolerance indications

GB/T 6170-2000 Hexagon nuts, style 1

GB/T 23259-2009 Sight glass for pressure vessels

HG/T 20592-2009 Steel pipe flanges (PN designated)

HG/T 20606-2009 Non-metallic flat gaskets for use with steel pipe flanges (PN designated)

JB/ZQ 4452-2006 Cheese head screws plug



3 Specifications and designation



See table 1 for specifications and designation of sight glass for pressure vessels.

Foreword i
1 Scope
2 Normative references
3 Specifications and designation
4 Types
5 Basic parameters
6 Marks
7 Technical conditions
8 Marking, transportation and packaging
Annex A (Informative) Selection of companion pipe flange for clamping and fixing sight glass
Annex B (Informative) Selection of sight glass spotlights
Annex C (Informative) Selection of sight glass rinsing device