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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...

Dear Piping Engineers, Any idea when will next edition of EI guidelines be published?

Zounds! Missed the obvious point. Yes, that WAS the mistake. Got speed soound at 1333 m/sec. Thanks ax1e. Appreciated.

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) =...

Thanks George and Littleinch. George, Though idea to change to larger size seems most pertinent, but here most "fit for purpose" solution would be to increase the rigidity of the supports as LittleInch pointed out. For this particular line, the line branches off with a sockolet from a 3" line...

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...

All responses appreciated with thanks! It is a fact that hot tapping on pipes having much higher pressure than 70 bars is being done. We need to find the good expert hot tap specialist.

Agreed! Even TOTAL Spec GS EP PVV 172 section 4 states (Hot tapping is prohibited for the following cases): "Pipe operating at 70 barg and above, unless otherwise agreed with HSE discipline and site representative"

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...

The pipe shoes were painted. (I am not sure of Zinc rich coating). @ WELDSTAN, Point here is that though structurally the supports are still adequate, but the water due to moisture condensation will again corrode. So you are suggesting to apply "Aluminized Coating" on the supports. Question is...

@MJCRONIN, the sketch may help in visualizing.

Fatih, the environment is saltish, hot, humid on shores of UAE. Littleinch, you are right. 13°C is a cold temperature where the summer peak can be 55°C and even in winter the temperature during daytimes is around 18-20°C. Moisture accummulation at pipe is must due to this. Line material is LTCS.

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...

Shell DEP for Cement lining is at inactive status now.

Thanks Mr. Sen, But no international standard supports the contractor's proposal. Correct me if I am wrong!

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...

As this was related to metal seated valves, so COMPANY asked to remove this term.

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...

Littleinch has put it nicely. The reasons for not using the globe valve are mainly two - unnecessary pressure drop and higher cost of globe valve!