Engineering Hub

Preventative maintenance is a planned activity to clean, inspect, and test heating, cooling, and refrigeration equipment to ensure they run efficiently, reliably, and have a long service life. Most businesses practice reactive maintenance or “run it till it breaks” which has low upfront costs but will ultimately degrade equipment performance and reliability. Over 50% of business owners still operate with a philosophy of reactive maintenance. The Basics: Replace all filters quarterly Inspect and clean evaporator and condenser coils quarterly Inspect and lubricate fan motors quarterly Replace all belts annually 30 Point Maintenance Check (see below list) Special Issues:  Thermostat Settings :- Programmable thermostats can be confusing so if there are any questions these should be checked out. A lot of energy is wasted by not having the units “set back” when the building is unoccupied. Settings should be checked and adjusted to prevent excessive run time, maintain co...

Pipeline Installation refers to the laying of a pipeline to transport natural resources from the place of extraction to where they can be used or even within the place of their extraction. Laying pipeline on the seafloor can be challenging, especially when the water is deep. The most common methods of installing pipelines are S-lay, J-lay and Reel-lay. Other methods that are being used for installing pipelines are tow methods. The tow methods can be used to install pipelines from the shallow water depths to deep water depths. The methods that are used to install pipelines are as follows: S-lay: S-shaped curve is formed when the pipe curves downward while coming off the lay barge through the water until the pipe reaches the touchdown point. This method is different when compared to other methods because a stringer is used to support the pipe when it leaves the tensioner and the barge to avoid pipe buckling. J-lay: This method is named due to its J-shaped curve formed after the p...

What Is Expansion Valve ? The expansion valve is situated in the liquid line between the condenser and the inlet of the evaporator.This is one of the basic components of the refrigeration system which are used to control refrigerant flow.It reduce the pressure & temperature of the refrigerant coming from the condenser as per the requirement of the system. And also helps to regulate the flow( Metering ) of refrigerant as per the load on the Evaporator. Expansion valves do not directly control the ev​aporation temperature. Instead, they regulate the superheating by adjusting the mass flow of refrigerant into the evaporator, and maintain the pressure difference between the highpressure and low-pressure sides. The evaporation temperature depends on the capacity of the compressor and the characteristics and efficiency of the evaporator. The term "low side" is used to indicate part of the system that acts under low pressure, in this case evaporator. high side is us...

PIPING JOINTS  Joint design and selection can have a major impact on the initial installed cost, the long-range operating and maintenance cost, and the performance of the piping system. Factors that must be considered in the joint selection phase of the project design include material cost, installation labor cost, degree of leakage integrity required, periodic maintenance requirements, and specific performance requirements. In addition, since codes do impose some limitations on joint applications, joint selection must meet the applicable code requirements. In the paragraphs that follow, the above-mentioned considerations will be briefly discussed for a number of common pipe joint configurations. Butt-welded Joints Butt-welding is the most common method of joining piping used in large commercial, institutional, and industrial piping systems. Material costs are low, but labor costs are moderate to high due to the need for specialized welders and fitters. Long term le...