Brief Introduction of Breathing Valve The breathing valve is an equipment that not only ensures that the storage tank space is isolated from the atmosphere within a certain pressure range, but also can communicate with the atmosphere when exceeding or below this pressure range. Its function is to prevent the tank from being damaged by over pressure or vacuum, and at the same time reduce the evaporation loss of the storage liquid. The setting can not only reduce the gas emission in the tank, thereby reducing the pollution to the atmosphere, but also prevent the tank from being damaged by over pressure or destabilized by ultra-vacuum, which plays a certain role in promoting safety and environmental protection. It is mainly composed of a seat, a cover, a protective cover and two groups of opening and closing devices controlled by vacuum and pressure. The opening and closing device comprises a valve […]
MECHANICAL
How to measure the compression for Mechanical Seal of Double Support Centrifugal Pump? Step 1: Measure the distance between bearing box and suspension contact surface and bearing box and bearing skin end face. a. Use a depth rule from the contact plane between the bearing box and the gland to the contact plane between the bearing box and the end face of the bearing skin (e.g.; Distance is 109.4mm minus vernier caliper thickness 4mm=105.4mm). b. Use vernier calipers to measure the contact plane between bearing and gland to the contact plane between bearing box and suspension (e.g.; Distance is 115mm minus depth gauge thickness 5mm=110mm).The number of a is 105.4mm and the number of b is 110mm= the distance between bearing box and suspension contact surface and bearing box and bearing skin end surface is 4.6mm. Step 2: Install the shaft sleeve and moving ring on the shaft. The purpose […]
How to measure the compression of mechanical seals? Sealing compression measurement steps:Before measuring the compression of the seal, it is necessary to understand the phase position relationship of each part of the seal to avoid calculation errors in the measurement process. Measure the dimensions of the bushing positioning table to the sealing surface Measurement of gland positioning surface to static ring sealing surface Pay attention to the selection of measuring points when measuring, generally more than 3 points should be measured symmetrically; Measure gland sealing surface to positioning table dimensions When measuring the gland to the sealing surface, it is generally necessary to measure more than 3 points symmetrically; When the measurement data difference is too large, check whether the gland is deformed or corroded;Checking whether the static ring installation is in place is the basic element to ensure the accuracy of measurement data; Measure the dimensions from the bushing […]
Centrifugal Pump is Evacuated Phenomenon How to Do? Centrifugal pump in the practical application, there will always be a variety of conditions, one of the many reasons for centrifugal pump failure when the phenomenon of evacuation, always make you feel very headache. What if the centrifugal pump is evacuated? After the pump is pumped, or during the process of pumping1) The vibration of the pump body is large, and the dynamic and static rings of the mechanical seal will continue to intermittently collide, resulting in leakage, and the failure of the mechanical seal structure in serious cases;2) The compression of the dynamic and static ring of the mechanical seal is the sum of the medium pressure and the pretension force of the spring, when evacuated, the medium pressure will not be there, the contact pressure of the dynamic and static ring will become smaller, and the seal will fail;3) After […]
Six Steps of Vibration Analysis for Field Faults In the field fault analysis, first of all, we should have a macro understanding of the equipment, and get the surface cause according to the external characteristics. Then the mechanism analysis of its main vibration characteristics is carried out to judge the deep-seated reasons. 1. Understand the vibration history When the vibration of the machine increases suddenly or gradually, determine whether the vibration is stable during the period, if it is not stable, which parameters are associated with it, and so on. For example, the sudden increase of vibration may be the sudden unbalance of the rotor and the sudden weakening of the stiffness. Whether the amplitude instability is associated with load adjustment, temperature change, start and stop, etc. 2. Understand the maintenance situation If the vibration before and after the start of the maintenance, if the vibration before the maintenance is […]