Pressure Vessels Mirrors, also known as equipment mirrors, are used to observe chemicals, oil, cosmetics, pharmaceuticals and other industrial equipment containers within the media changes in a product. The operator adjusts or controls the filling amount according to the situation shown therein so as to ensure that the medium in the container is always within the normal range. Liquefied gas tanks, tankers, gas-liquid reactors, reactors and other containers need to install the mirror to prevent excessive oversupply caused by the accident or due to excessive feeding material caused by the phenomenon of imbalance.
The latest standard
NB / T47017 pressure vessel mirror standard published by the National Energy Board in 2011.7.1, in the same year on October 1 implementation.
NB / T470-1994 pressure vessel sight glass standard finish HGJ51-502-1986 pressure vessel sight glass, HG / T21575-1994 with light mirror, HG / T21505-1992 combination of sight glass and other styles and into a style. A considerable improvement, increased the DN200 of the mirror specifications; to improve the use of part of the mirror pressure; canceled the mirror wash hole, with reference to foreign standards using flushing device; increased with the lighting of the mirror specifications; The requirements for visual signs and transport packaging.
Main style
NB / T47017 pressure vessel inside the mirror provides three styles, conventional style, with a lamp style, with a flushing device.
 The main technical parameters
Shell material: carbon steel WCB, stainless steel 304,321,316,316 L.
Windows Material: tempered glass, boronized glass, quartz glass.
Sealing material: nitrile rubber, polytetrafluoroethylene.
Working pressure (MPa): ≤2.5
Working temperature (℃): 0 ~ 200 ℃
Installation location selection
1. The sight glass should be welded to the site where it is to be observed, and there is no obstruction to the observer and light to enter the chemical and other containers also need to choose a more ventilated position to ensure the safety of the operation of employees.
2. If the internal light is not enough or can not observe the dead ends, then in the opposite welding a mirror or choose a light container view mirror;
3. The height of the operator to observe the convenience is appropriate, the internal should ensure that no obstruction of the line of sight components;
4. Avoid the welds of the container itself and other internal parts.
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