seth@tkflow.com 
Sea water has a total salt content of about 25 g/ℓ. Sakitar 75% eusi uyah nyaéta natrium klorida Nacl. Nilai-nilai cai laut biasana antara 7,5 sareng 8,3. Dina kasatimbangan sareng sumosfrey, eusi oksigén dina 15 ℃ kira-kira 8 mg / ℓ.
Dina kasus anu tangtu, cai laut kumased sacara kimia atanapi fisika-sekali. Hasilna ieu, kekerasan anu diusahakeun. In the case of chemical degasification, it should be noted that degassing takes time. Consequently, it is very important that the degasification operation, ie removal of the oxygen, is fully completed before the sea water enters the pump.
Perawatan kedah laksana Even though the inrushes are limited time-wise, damage to the materials may rapidly occur under certain circumstances if the presence of oxygen is not considered when the materials are selected. Upami at tangkal oksigén teu tiasa dikaluarkeun nalika operasi ngiringan, éta umumna kedah dianggap yén cai laut ngandung oksigén.
Istilah 'Chackish'l'l'l Saloba seleksi bahan prihatin, limprasi sami panutan kanggo transport cai brackish sapertos cai laut. In addition, brackish water frequently contains ammonia and/or hydrogen sulphide. Even a low content of hydrogen sulphide, ie in the region of a few milligrams per litre, causes a pronounced increase in the aggressiveness.
Salt water from underground sources frequently has a much higher salt content than sea water, quite often it is about 30%, ie just under the solubility limit. Di dieu deui, uyah umum mangrupikeun constronu utama. Nilai pH biasana dibandingkeun rendah (turun sakitar 4), nyaéta cai halimun. Padahal eusi oksigén anu rendah pisan atanapi henteu aya hubunganana, H₂s kontén sababaraha ratus ratusan miligrits per liter.
Salaku akibatna kontén uyah luhur sareng gumantung kana kaayaan operasi, hiji kedah ngaharepkeun gelar tangtu insipitasiem uyah. Dina kasus sapertos kitu, jalur lokasmasue anu cocog perlu pikeun nyata desain, operasi sareng seleksi bahan.
Komponén kedah dilakukeun tina bahan tina jinis anu sami pikeun nyegah korosi galvanik. Béda naon antara bahan individu nyaéta salaku low. However, if unlike materials have to be employed for design reasons, the surfaces of the less noble metal in contact with the water should be large in comparison with those of the noble metal. Figure 5 provides information on the danger of galvanic corrosion when different type materials are combined.
Laju tinggi tiasa ngakibatkeun korosi érosi. The consequences become increasingly serious, the more aggressive the medium, and the higher its velocity. Whereas the flow rate affects the behaviour of stainless steels and nickel alloys to only a minor degree, the position is reversed where unalloyed ferrous materials and copper alloys are involved. Figure 6 provides qualitative information on the influence of flow rates. Due consideration must be given thereby as to whether the medium contains oxygen or H₂S. Large quantities of H₂S tend to exclude the presence of oxygen; in such cases, the medium is slightly acidulous, down to a pH of 4.
Tabel 1 Ngajantenkeun Aplikasi pikeun bahan pompa atanapi kombinasi na. Kacuali tiasa dinyatakeun, inpormasi ieu ngajantenkeun cai laut tanpa eusi kontén.
Baja anu teu cocog henteu cocog pikeun cai laut, kecuali disayogikeun ku palapis pelindung anu cocog. Cast iron is only to be used for low velocities (possible for casings); in this case normal cathodic protection of the other internals should be employed.
Waktu Pasang: Mar-11-2025