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  • Users: uaepiping
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  1. uaepiping

    Surge blocks for underground GRE Piping

    Surge analysis is carried out for underground firewater networks. Then the forces from surge analysis are taken and modelled in Caesar model and system is analyzed. Based on results, the recommendations for surge blocks are provided. Question has been raised that why surge blocks are needed for...
  2. uaepiping

    Energy Institute Guidelines - Speed of Sound Calculations

    Reference is made to the Energy Institute Guidelines for Avoidance of Vibrations section T2.8.3.2, the speed of sound is calculated by equation: Where, C = Speed of Sound in liquid (m/s) = To be found ρ = Fluid density (kg/m3) = 730.9 kg/m3 k = Fluid bulk modulus (N/m2) =...
  3. uaepiping

    A 3" propane makeup line to refrige

    A 3" propane makeup line to refrigerant surge drum has a ¾" PSV. Inlet line is also ¾". This inlet line to PSV is vibrating. It is reported that the propane makeup line is not vibrating. Now the question is as this is normally no flow line, what is causing vibration? The vibration as per Energy...
  4. uaepiping

    Hot Tapping Pressure Limitation

    Dear All, Shell DEP 31.38.60.10-Gen. Section 3.3.3.1 Item 1 states: “For general safety reasons, at any time during the hot-tap operation the pressure of fluid inside the run-pipe shall not exceed 7000 kPa (ga) (1000 psig)" So apparently it seems that hot tapping shall not be performed on run...
  5. uaepiping

    Corrosion on Welded Shoes on Cold Line

    The supports on a cold fluid lines are provided outside the insulation cladding. Below this cladding is PUF type insulation blocks, vapor barriers (to avoid any moisture ingress to pipe's cold surface). The supports are clamped type installed on the cladding. The support steel resting on...
  6. uaepiping

    Tie-in to a Cement Lined Piping System

    The problem: Tie-in new 6" cement lined piping to a) 20" cement lined header b) 10" Cement lined header. Contractor's proposal: A) With 20": Existing 20" pipe shall but cut. Cement will be cleared by chisels up to at least 20mm from the edge of the cut. A new pipe (100mm) plus flange (already...
  7. uaepiping

    Anti Static Test F22 at 100 Volts as per BS EN 12266

    One of the valve specification states "Additional supplementary test F22 (Antistatic design test) requirements by the MANUFACTURER with test sampling as agreed between CONTRACTOR, COMPANY and VENDOR and to be specified in the purchase requisition, for high performance triple offset butterfly...
  8. uaepiping

    Fire Test Certificate

    Dear All, One of the valve vendor quoted a 24" Ball valve for HC gas service. We asked for the fire test certificate. We required the valve (as normally happens [smile]) urgently. The vendor (judging our urgency) has come up with the "Solution" - arranging a fire test certificate will take 8 to...
  9. uaepiping

    Dislocation of Cold Clamped Shoe Support

    Dear Piping Engineers, Have a look at the video in below link: https://youtu.be/oBdpx6xDvC0 There are many incidents of this type in our plants. The reasons may be: 1) Loosening of bolts of clamps a) Due to Installer mistake b) Due to compression of the cladding under the load of the piping c)...
  10. uaepiping

    Category M Fluid

    ASME B31.3 para 300.2 Definitions defines the Category M fluid as "the fluid is so highly toxic that a single exposure to a very small quantity of the fluid, caused by leakage, can produce serious irreversible harm to persons on breathing or bodily contact, even when prompt restorative measures...
  11. uaepiping

    Bolt size, number and torque on cold clamp shoes

    Referring to the closed thread http://www.eng-tips.com/viewthread.cfm?qid=390724 I tried to search the source of calculating the bolt size, number and torque requirements on clamp type shoes on cold insulated lines. But could not! The variables can be as below: 1) Compressive strength of the...
  12. uaepiping

    Seat Leakage Rate for Check Valves

    As per BS 1868 the leakage rate given is Rate A for resilient seated valves and Rate C (As per BS EN 12266-1) for metallic seated valves. API 594 states leakage rates as per API 598, which (in table 6) states all resilient seated valves to have ZERO leakage and different rates are listed for...
  13. uaepiping

    Double Flanged Dual Plate Valve - Length

    Dear Piping engineers, As per table 3 of API 594, the face to face dimension of double flanged dual plate check valve for 14"-1500# is 356mm. The bolt length for the 14"-1500# flanges is 405mm. So fitting two bolts with flanges at the ends is not possible. Taking it other way: The flange...
  14. uaepiping

    10% Variability of Spring Hangers

    Dear piping engineers, A question is raised in our company that why in stress analysis specs, spring hanger's variability is reduced from normal 25% to 10% for strain sensitive equipment? The reason stated is that if the load on an equipment is within allowable limit, then what difference does...
  15. uaepiping

    10% Spring Hanger Variability

    Dear piping engineers, A question is raised in our company that why in stress analysis specs, spring hanger's variability is reduced from normal 25% to 10% for strain sensitive equipment? The reason stated is that if the load on an equipment is within allowable limit, then what difference does...
  16. uaepiping

    Problmes faced while using iso-container

    Dear friends, During shutdowns of the plants many a times we need to bring different chemicals inside the plant in iso-containers. Safety concerns have been raised in our company that this practice is not safe and poses many dangers/risks. The personnel opposing it say permanently installed...
  17. uaepiping

    Qualification of GRE manufacturer

    Dear Piping engineers, The main question here is how to qualify a GRE manufacture to be on the approved manufacturers list of the company? In Iso 14692 - 2, Chapter 6 qualification of the manufacturer is given. It is mainly related to manufacturing part only (which seems fair enough). But the...
  18. uaepiping

    Spring hangers hot load adjustment

    Dear Experts, In an existing piping system having three generators, structural brackets supporting spring hangers failed. Stress analysis was done again and some new supporting points were identified for providing spring hangers. The system works on two generators running and one standby. Also...
  19. uaepiping

    Pipe Clamp Slippage on Cold Insulated Line

    Dear Experts, In one of our plants, the clamp supports displaced from the sleepers and fell down. The line data is like this: Size = 10" Design Temperature = -22 °C Operating Temp = -8°C Design Pressure = 27 Barg Operating Pressure = 10 Barg The line is connected to a 24" line which is connected...
  20. uaepiping

    Thermal Sprayed Aluminium

    Dear friends, A consultant is suggesting (TSA) thermally sprayed aluminium with hot insulation for a 16" diameter piping system. This system has cyclic service for which temperature changes from ambient to the 300°C. The minimum design temperature is -15°C. The line material is ASTM A333 Gr. 6...

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