Lerch Bates Inc.’s Post

Slenderness ratio as provided in the AISC Construction Manual is 200 for compression members and 300 for tension members. When you have secondary or very lightly loaded members with long spans, satisfying the slenderness ratio criteria may lead to unnecessary increase in the size of the members. This check is not necessary and may be ignored, however, it is recommended to carefully consider the criticality of member under consideration and consequences of ignoring this check. The consequences may include difficulty in handling during fabrication & erection, reduction in member load carrying capacity and excessive vibrations etc. #civilengineering #structuralengineering #aisc #stability #slenderness

#shaft #regulation #nfpa #ibc Floors require insulation and integrity to protect spaces above and below the fire. It is therefore necessary to protect against fire and smoke spread using such measures as encasement, fire dampers, fire stopping, cavity barriers and fire resistance to service shafts. This is particularly important where services pass through compartment floors. There are some rules in NFPA1, NFPA101, IBC and BS9999 also, see the table below! "12.7.8.2 Firestop Systems and Devices Required. 12.7.8.2.1 Penetrations for cables, cable trays, conduits, pipes, tubes, combustion vents and exhaust vents, wires, and similar items to accommodate electrical, mechanical, plumbing, and systems that pass through a wall, floor, or floor/ceiling assembly constructed as a fire barrier shall be protected by a firestop system or device. [NFPA 101:8.3.4.2.1]" "The requirements of 12.7.8.2 shall not apply where otherwise permitted by any one of the following: (2) Where penetrations through floors are enclosed in a shaft enclosure designed as a fire barrier [NFPA 101 8.3.4.2.5.1 (2)]"

Cold Weather Ratings Something for all of us to remember when using lifting gear in this cold weather. Asme B30. 20 & BTH-1 say in clause 1-4.7 that the design provisions in this standard are considered applicable when the temperature is in the range of 25 to 150 degrees F or –5 to 66 degrees C. For equipment operating outside of this range special considerations need to be made.

Understanding Pipe Thread Standards: Differentiating US NPT and BSPT ISO 7-1 By familiarizing yourself with the NPT and BSPT thread standards, you can ensure precision and compatibility in threaded connections for your projects! The NPT pipe thread standard, defined by ASME B1-20-1, is characterized by its tapered design, allowing for a tight seal between the threads. This standard is widely adopted in the United States for various applications, including plumbing, industrial piping, and hydraulic systems. Meanwhile, the BSPT pipe thread standard, specified in ISO 7-1, is prevalent in regions following European standards. BSPT threads feature a tapered design similar to NPT threads but with differences in thread angle and dimensions. Although less common in the United States, BSPT threads are widely used globally, particularly in Europe and parts of Asia and Australia. #PipeNipples #PipeFittings #IronPipes

The Importance of Following Standards: A Simple Example Why adhere to standards? Here's a concrete illustration: According to the NEMA VE2-2006 standards for cable tray installation, Clause 4.4 specifies the need for supports of fittings. Why does this matter? The second photo clearly shows the consequences of not installing according to these standards. By ensuring proper support locations, we prevent sagging and potential damage, enhancing safety and reliability. Following standards isn't just about compliance; it's about achieving better outcomes and maintaining quality in our projects. 🛠️📐 #Standards #Quality #EngineeringExcellence #NEMA #BestPractices

The below video demonstrates how the UL 864 listed LFSystems Active Compensated Stairwell Pressurization System (ACSP) controls pressure within a stairwell during a fire event to help maintain safe egress for building occupants.

“ Plumbing Work “ Part 4 Water supply “Inside building” • General requirements: 🛠️ Isolation Gate valve should be installed at the start point of netwotk, and at any bransh, also before the equipments such as electric water heater. “for maintenance purpose” 🚰 The fixture supply pipe shall terminate not more than 30 inches (762 mm) from the point of connection to the fixture as per IPC 2018 🩺 Water hammer arrestor should be installed on the system ; used to absorb the shock when water flowing in a piping system suddenly stops due to fast closing. ⚖️ Pipe clamp shall be used for holding the suspended network (Galvanized with rubber gasket) 🔩Pipe & fittings used shall be pressure rated and as per project requirements & standards 🔥Hot water line should be insulated with type and thickness as required in project specifications & standards. 🎯 Pipe should be Sleeved when passing through wall/slab for protection ☄️Any pipe penetrations through fire rated walls and partitions shall be sleeved and sealed around with UL/Approved fire stop system • Testing: - Network should be tested for 4 hrs with potable water. - At least two pressure gauges should be used for the test, the accuracy shall be within 5% of one another - Pressure gauges shall be calibrated prior to test, Calibration shall not NOT exceeding 1 month from the last calibration - Test pressure shall be within 30% to 80% of the full range of pressure gauge - Test pressure = 1.5 times the working pressure , not less than 150 psi. • Precaution: 💡 Pressure reducing valve should be used when the pressure of the supply line entering to the building more than the work pressure of the network inside building. 📕 For more details please visit IPC website Chapter 6: https://lnkd.in/gTRJZabz #plumbing #plumbingservices #watersupply #mechanical

Is the absence of the hydraulic nameplate considered a deficiency? As part of NFPA 13 sprinkler system acceptance requirements, all hydraulically designed sprinkler systems must be appropriately labeled as such “with a permanently marked weatherproof metal or rigid plastic sign secured with corrosion-resistant wire, chain, or other approved means” (29.4.1). These “signs shall be placed at every system riser, floor control assembly, alarm valve, dry pipe valve, preaction valve, or deluge valve supplying the corresponding hydraulically designed area unless the AHJ approves an alternate location.” (29.4.2) However, hydraulically calculated sprinkler systems designed and installed prior to the1968 edition of NFPA 13 are not required to have a hydraulic nameplate to be installed. Also, pipe scheduled systems are not required to have a hydraulic nameplate installed. To ensure the compliance of your sprinkler and hydraulic systems, consult with Collings & Associates now. 

Is the absence of the hydraulic nameplate considered a deficiency? As part of NFPA 13 sprinkler system acceptance requirements, all hydraulically designed sprinkler systems must be appropriately labeled as such “with a permanently marked weatherproof metal or rigid plastic sign secured with corrosion-resistant wire, chain, or other approved means” (29.4.1). These “signs shall be placed at every system riser, floor control assembly, alarm valve, dry pipe valve, preaction valve, or deluge valve supplying the corresponding hydraulically designed area unless the AHJ approves an alternate location.” (29.4.2) However, hydraulically calculated sprinkler systems designed and installed prior to the1968 edition of NFPA 13 are not required to have a hydraulic nameplate to be installed. Also, pipe scheduled systems are not required to have a hydraulic nameplate installed. To ensure the compliance of your sprinkler and hydraulic systems, consult with Collings & Associates now. 

Here’s what we know about some major code changes that will affect elevators located in Washington state. Updates will be posted as the become available.