Recent content by ShabsRBI

Looking at the following Residual Stress Chart with the distance from the weld, it seems that Residual stresses comes down at a distance of approximately 15-18mm. For a Carbon Steel piping normally we take a gap of 50mm between two welds.

Hi, As per ASME 31.3 for API 5L PSL2 the min temperature is listed as 0 Deg C and for intended MDMT for flare is -29 Deg C. As per requirement the pipe shall be subjected for Charpy Impact testing at -29 Deg C. Normally SA-106 Gr B piping is good enough for -29 Deg C without the Impact testing...

This means that pass partition plate being used for 5'-6" Channel is not conforming to TEMA requirements. Does this require replacement or shall be considered for continued service as it has worked well in the given situation?

Hi @r6155 I have old edition of TEMA and don't have latest edition of TEMA edition 11. It seems that TEMA Ed-11 has standardised the pass partition plate thickness as 5/8" , where as in old editions minimum thickness was based on Nominal size of Channel. Partition plate thickness used to vary...

Thanks @EdStainless We are planning to use 416SS components valve on a temporary basis for 6 months as SS316 COCr/Stellite6 valve lead time is approximately 6 months.

Thanks @BEMPE16524 I am planning to go ahead with the 416SS components in Boiler feed water service at given operating conditions.

There is a requirement to install a Control valve in Boiler Feed Water Service with a Operating Pressure of 4100 Kpa and temperature of 130 Deg C. The requirement is to have a Plug material with 316SS with COCr but the available valve has Plug material with 416SS. Similarly the Seat Material is...

Normally in this kind of situation, we weld build up the part partition plate, which has suffered knife edging and machine it to get the required thickness on the edge. By this way welding to channel is avoided. In most case the pass partition plate will have a tapered thickness on the edge...

For Carbon steel 3/4" tubes with 2.11mm thickness the prescribed Torque is approximately 7Nm.

As mentioned by @EdStainless the following rules are followed. 1. Expansion of tubes are done by contact expansion (1%-3%) of tube expansion. 2. Expansion from front of Shell side is done leaving 6-8mm. 3. Expansion to the back of tube sheet is done leaving approximately 3mm.

It is recommended to follow an approved WPS for performing the seal welding. Ensure that the correct welding consumables are used as defined in WPS. It is a hard task seal welding the TTS joints as due to thermal expansion the TTS joints in the proximity tubes tend to crack and then it becomes a...

Hi @EdStainless Based on your recommendations I tried to look ASTM A 923 test and realised the following. Formation of Intermetallic in Duplex SS is result of exposure to 320 to 955 Deg C. Since our requirement is only for 70 Deg C and maximum with 150 Deg C, do you think that there is a...

Hi @EdStainless I checked with our Process Engineering and following are the additional details. Operating Temp : 70 Deg C pH : 6.0-7.0 H2S Content : <120 ppm Any additional comments are highly appreciable.

Thanks very much @SJones and @EdStainless for your valuable input.

We are looking for Pump body for Sour water service having 60ppm Cl ( Chloride) and Design Temperature of 150 Deg C. Pump vendor has offered SS316L but due to high Chloride and high temperature use of SS316L is not a preferred option. Another option the Pump Vendor is offering is SS316L body...